TMP431ADGKR - Texas Instruments

TMP432

DXP

DXN

V+

SCL

SDA

THERM

+5V

SMBus

Controller

GND

ALERTTHERM2/

OneChannelLocal

OneChannelRemote

TMP431

V+

SCL

SDA

+5V

SMBus

Controller

GND

DXP1

DXN1

DXP2

DXN2

OneChannelLocal

TwoChannelsRemote

TMP432

ALERT

THERM2

THERM

TMP431

TMP432

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SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

1°C TEMPERATURE SENSOR with Series-R,

η-Factor, and Automatic Beta Compensation

Check for Samples: TMP431,TMP432

1FEATURES DESCRIPTION

234• ±1°C REMOTE DIODE SENSOR The TMP431 and TMP432 are remote temperature

sensor monitors with a built-in local temperature

• ±1°C LOCAL TEMPERATURE SENSOR sensor. The remote temperature sensor

•AUTOMATIC BETA COMPENSATION diode-connected transistors are typically low-cost,

• η-FACTOR CORRECTION NPN- or PNP-type transistors or diodes that are an

•PROGRAMMABLE THRESHOLD LIMITS integral part of microcontrollers, microprocessors, or

FPGAs.

•TWO-WIRE/ SMBus™SERIAL INTERFACE Remote accuracy is ±1°C for multiple IC

•MINIMUM AND MAXIMUM TEMPERATURE manufacturers, with no calibration needed. The

MONITORS Two-Wire serial interface accepts SMBus write byte,

•MULTIPLE INTERFACE ADDRESSES read byte, send byte, and receive byte commands to

•ALERT/THERM2 PIN CONFIGURATION program the alarm thresholds and to read

temperature data. DLP®

•DIODE FAULT DETECTION The TMP431/32 include beta compensation

APPLICATIONS (correction), series resistance cancellation,

•LCD/DLP®/LCOS PROJECTORS programmable non-ideality factor, programmable

resolution, programmable threshold limits, minimum

•SERVERS and maximum temperature monitors, wide remote

•INDUSTRIAL CONTROLLERS temperature measurement range (up to +150°C), and

•CENTRAL OFFICE TELECOM EQUIPMENT diode fault detection and temperature alert function.

•DESKTOP AND NOTEBOOK COMPUTERS The TMP431 is available in an MSOP-8 package and

•STORAGE AREA NETWORKS (SAN) the TMP432 is available in an MSOP-10 package.

•INDUSTRIAL AND MEDICAL EQUIPMENT

•PROCESSOR/FPGA TEMPERATURE

MONITORING

1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2DLP is a registered trademark of Texas Instruments.

3SMBus is a trademark of Intel Corporation.

4All other trademarks are the property of their respective owners.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

TMP431

TMP432

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

www.ti.com

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

PACKAGE INFORMATION(1)

TWO-WIRE THERM HIGH PACKAGE- PACKAGE PACKAGE

PRODUCT DESCRIPTION ADDRESS LIMIT LEAD DESIGNATOR MARKING

Remote Junction

TMP431A 100 1100 +85°C MSOP-8 DGK DRTI

Temperature Sensor

Remote Junction

TMP431B 100 1101 +85°C MSOP-8 DGK DRUI

Temperature Sensor

Remote Junction

TMP431C 100 1100 +105°C MSOP-8 DGK DUEC

Temperature Sensor

Remote Junction

TMP431D 100 1101 +105°C MSOP-8 DGK DUFC

Temperature Sensor

Remote Junction

TMP432A 100 1100 +85°C MSOP-10 DGS DSCI

Temperature Sensor

Remote Junction

TMP432B 100 1101 +85°C MSOP-10 DGS DSDI

Temperature Sensor

(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the

device product folder at www.ti.com.

ABSOLUTE MAXIMUM RATINGS(1)

Over operating free-air temperature range, unless otherwise noted. TMP431, TMP432 UNIT

Power Supply, VS+7.0 V

Pins 2, 3, and 6 only –0.5 to VS+ 0.5 V

TMP431 Input

Voltage Pins 4, 7, and 8 only –0.5 to 7 V

Pins 2, 3, 4, 5, and 8 only –0.5 to VS+ 0.5 V

TMP432 Input

Voltage Pins 7, 9, and 10 only –0.5 to 7 V

Input Current 10 mA

Operating Temperature Range –55 to +127 °C

Storage Temperature Range –60 to +130 °C

Junction Temperature (TJmax) +150 °C

Human Body Model (HBM) 4000 V

ESD Rating Charged Device Model (CDM) 1000 V

Machine Model (MM) 200 V

(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may

degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond

those specified is not implied.

Product Folder Link(s): TMP431 TMP432

TMP431

TMP432

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SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

ELECTRICAL CHARACTERISTICS

At TA=–40°C to +125°C and VS= 2.7V to 5.5V, unless otherwise noted. TMP431

TMP432

PARAMETER CONDITIONS MIN TYP MAX UNIT

TEMPERATURE ERROR

Local Temperature Sensor TELOCAL TA=–40°C to +125°C±1.25 ±2.5 °C

TA= +0°C to +100°C, VS= 3.3V ±0.25 ±1°C

Remote Temperature Sensor(1) TEREMOTE TA= 0°C to +100°C, TDIODE =–40°C to +150°C, VS= 3.3V ±0.25 ±1°C

TA=–40°C to +100°C, TDIODE =–40°C to +150°C, VS= 3.3V ±0.5 ±1.5 °C

TA=–40°C to +125°C, TDIODE =–40°C to +150°C±3±5°C

vs Supply (Local/Remote) VS= 2.7V to 5.5V ±0.2 ±0.5 °C/V

TEMPERATURE MEASUREMENT

Conversion Time (per channel)

Local Channel 12 15 17 ms

Remote Channel

RC = 1 97 126 137 ms

MBeta Correction Enabled (2)

RC = 0 36 47 52 ms

RC = 1 72 93 100 ms

MBeta Correction Disabled (3)

RC = 0 33 44 47 ms

Resolution

Local Channel 12 Bits

Remote Channel 12 Bits

Remote Sensor Source Currents

High 120 μA

Series Resistance (beta correction) (4)

Medium High 60 μA

Medium Low 12 μA

Low 6 μA

Remote Transistor Ideality Factor ηTMP431/32 optimized ideality factor 1.000(2)

1.008(3)

Beta Correction Range β0.1 27

SMBus INTERFACE

Logic Input High Voltage (SCL, SDA) VIH 2.1 V

Logic Input Low Voltage (SCL, SDA) VIL 0.8 V

Hysteresis 500 mV

SMBus Output Low Sink Current 6 mA

SDA Output Low Voltage VOL IOUT = 6mA 0.15 0.4 V

Logic Input Current 0 ≤VIN ≤6V –1 +1 μA

SMBus Input Capacitance (SCL, SDA) 3 pF

SMBus Clock Frequency 3.4 MHz

SMBus Timeout 25 32 35 ms

SCL Falling Edge to SDA Valid Time 1 μs

DIGITAL OUTPUTS

Output Low Voltage VOL IOUT = 6mA 0.15 0.4 V

High-Level Output Leakage Current IOH VOUT = VS0.1 1 μA

ALERT/THERM2 Output Low Sink Current ALERT/THERM2 Forced to 0.4V 6 mA

THERM Output Low Sink Current THERM2 Forced to 0.4V 6 mA

(1) Tested with less than 5Ωeffective series resistance and 100pF differential input capacitance. TAis the ambient temperature of the

TMP431/32. TDIODE is the temperature at the remote diode sensor.

(2) Beta correction configuration set to '1000'and sensor is GND collector-connected (PNP collector to ground).

(3) Beta correction configuration set to '0111'or sensor is diode-connected (base shorted to collector).

(4) If beta correction is disabled ('0111'), then up to 1kΩof series line resistance is cancelled; if beta correction is enabled ('1xxx'), up to

300Ωis cancelled.

Product Folder Link(s): TMP431 TMP432

TMP431

TMP432

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

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ELECTRICAL CHARACTERISTICS (continued)

At TA=–40°C to +125°C and VS= 2.7V to 5.5V, unless otherwise noted. TMP431

TMP432

PARAMETER CONDITIONS MIN TYP MAX UNIT

POWER SUPPLY

Specified Voltage Range VS2.7 5.5 V

Quiescent Current IQ0.0625 Conversions per Second, VS= 3.3V 35 45 μA

Eight Conversions per Second, VS= 3.3V(5) 0.7 1 mA

Serial Bus Inactive, Shutdown Mode 3 10 μA

Serial Bus Active, fS= 400kHz, Shutdown Mode 90 μA

Serial Bus Active, fS= 3.4MHz, Shutdown Mode 350 μA

Undervoltage Lockout UVLO 2.3 2.4 2.6 V

Power-On Reset Threshold POR 1.6 2.3 V

TEMPERATURE RANGE

Specified Range –40 +125 °C

Storage Range –60 +130 °C

Thermal Resistance

MSOP-8 θJA 215 °C/W

MSOP-10 θJA 165 °C/W

(5) Beta correction disabled.

Product Folder Link(s): TMP431 TMP432

SCL

SDA

GND

V+

DXP

DXN

THERM

ALERTTHERM2/

TMP431

SCL

SDA

ALERTTHERM2/

THERM

GND

V+

DXP1

DXN1

DXP2

DXN2

TMP432

TMP431

TMP432

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SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

PIN CONFIGURATIONS

DGK PACKAGE

MSOP-8

(TOP VIEW)

TMP431 PIN ASSIGNMENTS

TMP431

NO. NAME DESCRIPTION

1 V+ Positive supply (2.7V to 5.5V)

2 DXP Positive connection to remote temperature sensor

3 DXN Negative connection to remote temperature sensor

4 THERM Thermal flag, active low, open-drain; requires pull-up resistor to V+

5 GND Ground

6 ALERT/THERM2 Alert (reconfigurable as second thermal flag), active low, open-drain; requires pull-up resistor to V+

7 SDA Serial data line for SMBus, open-drain; requires pull-up resistor to V+

8 SCL Serial clock line for SMBus, open-drain; requires pull-up resistor to V+

DGS PACKAGE

MSOP-10

(TOP VIEW)

TMP432 PIN ASSIGNMENTS

TMP432

NO. NAME DESCRIPTION

1 V+ Positive supply (2.7V to 5.5V)

2 DXP1 Channel 1 positive connection to remote temperature sensor

3 DXN1 Channel 1 negative connection to remote temperature sensor

4 DXP2 Channel 2 positive connection to remote temperature sensor

5 DXN2 Channel 2 negative connection to remote temperature sensor

6 GND Ground

7 THERM Thermal flag, active low, open-drain; requires pull-up resistor to V+

8 ALERT/THERM2 Alert (reconfigurable as second thermal flag), active low, open-drain; requires pull-up resistor to V+

9 SDA Serial data line for SMBus, open-drain; requires pull-up resistor to V+

10 SCL Serial clock line for SMBus, open-drain; requires pull-up resistor to V+

Product Folder Link(s): TMP431 TMP432

RemoteTemperatureError( C)

-50 -25 0 25 50 75 100 125

AmbientTemperature,T (

AC)

BetaCompensationDisabled.

GNDCollector-ConnectedTransistorwithn-Factor=1.008.

LocalTemperatureError( C)

-50 -25 0 25 50 75 100 125

AmbientTemperature,T (

AC)

700

600

500

400

300

200

100

I ( A)m

0.0625 0.125 0.25 0.5 1 2 48

ConversionRate(conversions/s)

TMP431

TMP432

V =3.3V

150

100

-150

RemoteTemperatureError( C)

0 5 10 15 20 3025

LeakageResistance(M )W

RGND (LowBeta)

RVs

RVs (LowBeta)

RGND

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

I ( A)m

2.5 3.0 3.5 4.0 4.5 5.0 5.5

V (V)

500

450

400

350

300

250

200

150

100

I ( A)m

1k 10k 100k 1M 10M

SCLClockFrequency(Hz)

V =3.3V

V =5.5V

TMP431

TMP432

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

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TYPICAL CHARACTERISTICS

At TA= +25°C and VS= 3.3V, unless otherwise noted.

REMOTE TEMPERATURE ERROR LOCAL TEMPERATURE ERROR

vs TEMPERATURE vs TEMPERATURE

Figure 1. Figure 2.

REMOTE TEMPERATURE ERROR QUIESCENT CURRENT

vs LEAKAGE RESISTANCE vs CONVERSION RATE

Figure 3. Figure 4.

SHUTDOWN QUIESCENT CURRENT SHUTDOWN QUIESCENT CURRENT

vs SCL CLOCK FREQUENCY vs SUPPLY VOLTAGE

Figure 5. Figure 6.

Product Folder Link(s): TMP431 TMP432

2.5

2.0

1.5

1.0

0.5

1.0

1.5

2.0

2.5

RemoteTemperatureError( C)

0 100 200 300 400 500

R ( )W

RemoteTemperatureError( C)

0 100 200 300 400 500 600 700 800 900 1k

R ( )W

Diode-ConnectedTransistor,2N3906(PNP)(2)

GNDCollector-ConnectedTransistor,2N3906(PNP)(1)(2)

NOTES(1):Temperatureoffsetistheresultof

-factorbeingautomaticallysetto1.000.

Approximate -factorof2N3906is1.008.

(2)SeeFigure11forschematicconfiguration.

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2

Capacitance(nF)

RemoteTemperatureError( C)

GNDCollector-ConnectedTransistor(Auto)

Low-BetaTransistor(Disabled)

NOTE:SeeFigure12forschematicconfiguration.

Diode-Connected

Transistor(Auto,Disabled)

GNDCollector-

Connected

Transistor(Disabled)

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2

Capacitance(nF)

RemoteTemperatureError( C)

Low-BetaTransistor(Auto)

TMP431

TMP432

www.ti.com

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

TYPICAL CHARACTERISTICS (continued)

At TA= +25°C and VS= 3.3V, unless otherwise noted. REMOTE TEMPERATURE ERROR vs SERIES

RESISTANCE

REMOTE TEMPERATURE ERROR vs SERIES

RESISTANCE (Low-Beta Transistor)

Figure 7. Figure 8.

REMOTE TEMPERATURE ERROR REMOTE TEMPERATURE ERROR

vs DIFFERENTIAL CAPACITANCE vs DIFFERENTIAL CAPACITANCE with 45nm CPU

AT +25°C, VCC = 3.3V, RS= 0ΩAT +25°C, VCC = 3.3V, RS= 0Ω, Beta = 011 (AUTO)

Figure 9. Figure 10.

Product Folder Link(s): TMP431 TMP432

(a) GNDCollector-ConnectedTransistor

DXP

DXN

(1)

(b) Diode-ConnectedTransistor

DXP

DXN

(1)

(b) Diode-ConnectedTransistor

(a) GNDCollector-ConnectedTransistor

DXP

DXN

CDIFF

(1)

DXP

DXN

CDIFF

(1)

TMP431

TMP432

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

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PARAMETRIC MEASUREMENT INFORMATION

TYPICAL CONNECTIONS

SERIES RESISTANCE CONFIGURATION

(1) RSshould be less than 1kΩ; see Filtering section.

Figure 11.

DIFFERENTIAL CAPACITANCE CONFIGURATION

(1) CDIFF should be less than 2200pF; see Filtering section.

Figure 12.

Product Folder Link(s): TMP431 TMP432

TMP431

TMP432

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SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

APPLICATION INFORMATION

controlling the emitter current provided acceptable

The TMP431 (two-channel) and TMP432 temperature measurement results. At 90nm process

(three-channel) are digital temperature sensors that geometry and below, however, the beta factor

combine a local die temperature measurement continues to decrease and the premise that it is

channel and a remote junction temperature independent of collector current becomes less

measurement channel in a single MSOP-8 (TMP431) certain.

or MSOP-10 (TMP432) package. They are Two-Wire-

and SMBus interface-compatible and are specified To manage this increasing temperature measurement

over a temperature range of –40°C to +125°C. The error, the TMP431/32 control the collector current

TMP431/32 contain multiple registers for holding instead of the emitter current. The TMP431/32

configuration information, temperature measurement automatically detect and choose the correct range

results, temperature comparator maximum/minimum depending on the beta factor of the external

limits, and status information. User-programmed high transistor. This auto-ranging is performed at the

and low temperature limits stored in the TMP431/32 beginning of each temperature conversion in order to

can be used to trigger an over/under temperature correct for any changes in the beta factor as a result

alarm (ALERT) on local and remote temperatures. of temperature variation. The device can operate a

Additional thermal limits can be programmed into the PNP transistor with a beta factor as low as 0.1. See

TMP431/32 and used to trigger another flag (THERM) the Beta Compensation Configuration Register

that can be used to initiate a system response to section for further information.

rising temperatures. Series Resistance Cancellation

For proper remote temperature sensing operation, the

TMP431 requires only a transistor connected Series resistance in an application circuit that typically

between DXP and DXN; the TMP432 requires results from printed circuit board (PCB) trace

transistors conncected between DXP1 and DXN1, resistance and remote line length is automatically

and between DXP2 and DXN2. cancelled by the TMP431/32, preventing what would

otherwise result in a temperature offset. A total of up

The SCL and SDA interface pins require pull-up to 1kΩof series line resistance is cancelled by the

resistors as part of the communication bus, while TMP431/32 if beta correction is disabled and up to

ALERT and THERM are open-drain outputs that also 300Ωof series line resistance is cancelled if beta

need pull-up resistors. ALERT and THERM may be correction is enabled, eliminating the need for

shared with other devices if desired for a wired-OR additional characterization and temperature offset

implementation. A 0.1μF power-supply bypass correction. See the two Remote Temperature Error vs

capacitor is recommended for good local bypassing. Series Resistance typical characteristic curves

See Figure 13 for a typical configuration of the (Figure 7 and Figure 8) for details on the effects of

TMP431; see Figure 14 for a typical configuration of series resistance on sensed remote temperature

the TMP432. error.

Beta Compensation Differential Input Capacitance

Previous generations of remote junction temperature The TMP431/32 can tolerate differential input

sensors were operated by controlling the emitter capacitance of up to 2200pF with minimal change in

current of the sensing transistor. However, temperature error. The effect of capacitance on

examination of the physics of a transistor shows that sensed remote temperature error is illustrated in

VBE is actually a function of the collector current. If Figure 9 and Figure 10,Remote Temperature Error

beta is independent of the collector current, then VBE vs Differential Capacitance. See the Filtering section

may be calculated from the emitter current. In earlier for suggested component values where filtering

generations of processors that contained PNP unwanted coupled signals is needed.

transistors connected to these temperature sensors,

Product Folder Link(s): TMP431 TMP432

0.1 Fm10kW

(typ)

10kW

(typ)

10kW

(typ)

10kW

(typ)

TMP431

DXP

DXN

V+

R(2)

SC(3)

DIFF

C(3)

DIFF

R(2)

GND

SCL

SDA

ALERTTHERM2/

THERM

+5V

SMBus

Controller

FanController

Diode-connectedconfiguration :

(1)

SeriesResistance

GNDcollector-connectedtransistorconfiguration :

(1)

(1)Diode-connectedconfigurationprovidesbettersettlingtime.

GNDcollector-connectedtransistorconfigurationprovidesbetterseriesresistancecancellation.

(2)R (optional)shouldbe<1k inmostapplications.SelectionofRWdependson

S S

specificapplication;see section.Filtering

(3)C shouldbe<2200pF.SelectionofC

DIFF DIFF dependsonspecificapplication;

see sectionandFigure9,Filtering RemoteTemperatureErrorvsDifferentialCapacitance.

NOTES:

ALERTTHERM2/

THERM

0.1 Fm10k

(typ)

W10k

(typ)

W10k

(typ)

W10k

(typ)

TMP432

+5V

SCL

GND

SDA

V+

SMBus

Controller

DXP1

DXN1

4DXP2

DXN2

FanController

C(3)

DIFF

R(2)

C(3)

DIFF

R(2)

C(3)

DIFF

R(2)

Diode-connectedconfiguration :

(1)

SeriesResistance

GNDcollector-connectedtransistorconfiguration :

(1)

(1)Diode-connectedconfigurationprovidesbettersettlingtime.

GNDcollector-connectedtransistorconfigurationprovidesbetterseriesresistancecancellation.

(2)R (optional)shouldbe<1k inmostapplications.SelectionofRWdependson

S S

specificapplication;see section.Filtering

(3)C shouldbe<2200pF.SelectionofC dependsonspecificapplication;

DIFF DIFF

see sectionandFigure9,Filtering RemoteTemperatureErrorvsDifferentialCapacitance.

NOTES:

TMP431

TMP432

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

www.ti.com

Figure 13. TMP431 Basic Connections

Figure 14. TMP432 Basic Connections

Product Folder Link(s): TMP431 TMP432

TMP431

TMP432

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SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

Temperature Measurement Data standard binary value, as shown in Table 1,Extended

Binary column. This configuration allows

Temperature measurement data are taken over a measurement of temperatures as low as –64°C, and

default range of 0°C to +127°C for both local and as high as +191°C; however, most

remote locations. However, measurements temperature-sensing diodes only measure with the

from –55°C to +150°C can be made both locally and range of –55°C to +150°C.

remotely by reconfiguring the TMP431/32 for the

extended temperature range, as described in this Additionally, the TMP431/32 are rated only for

section. Temperature data resulting from conversions ambient local temperatures ranging from –40°C to

within the default measurement range are +125°C. Parameters in the Absolute Maximum

represented in binary form, as shown in Table 1,Ratings table must be observed.

Standard Binary column. Note that any temperature Both local and remote temperature data use two

below 0°C results in a data value of zero (00h). bytes for data storage. The high byte stores the

Likewise, temperatures above +127°C result in a temperature with 1°C resolution. The second or low

value of 127 (7Fh). The device can be set to measure byte stores the decimal fraction value of the

over an extended temperature range by changing bit temperature and allows a higher measurement

2 of Configuration Register 1 from low to high. The resolution, as shown in Table 2.

change in measurement range and data format from

standard binary to extended binary occurs at the next The measurement resolution for both the local and

temperature conversion. remote channels is 0.0625°C, and cannot be

adjusted.

For data captured in the extended temperature range

configuration, an offset of 64 (40h) is added to the

Table 1. Temperature Data Format (Local and Remote Temperature High Bytes)

LOCAL/REMOTE TEMPERATURE REGISTER

HIGH BYTE VALUE (+1°C RESOLUTION)

STANDARD BINARY(1) EXTENDED BINARY(2)

TEMP (°C) BINARY HEX BINARY HEX

−64 0000 0000 00 0000 0000 00

−50 0000 0000 00 0000 1110 0E

−25 0000 0000 00 0010 0111 27

0 0000 0000 00 0100 0000 40

1 0000 0001 01 0100 0001 41

5 0000 0101 05 0100 0101 45

10 0000 1010 0A 0100 1010 4A

25 0001 1001 19 0101 1001 59

50 0011 0010 32 0111 0010 72

75 0100 1011 4B 1000 1011 8B

100 0110 0100 64 1010 0100 A4

125 0111 1101 7D 1011 1101 BD

127 0111 1111 7F 1011 1111 BF

150 0111 1111 7F 1101 0110 D6

175 0111 1111 7F 1110 1111 EF

191 0111 1111 7F 1111 1111 FF

(1) Resolution is 1°C/count. Negative numbers are represented in twos complement format.

(2) Resolution is 1°C/count. All values are unsigned with a –64°C offset.

space

Product Folder Link(s): TMP431 TMP432

THERMHysteresisRegister

BetaCorrectionRegister

ConfigurationRegister

StatusRegister

IdentificationRegisters

ConsecutiveAlertRegister

ConversionRateRegister

LocalandRemoteLimitRegisters

LocalandRemoteTemperatureRegisters

SDA

SCL

PointerRegister

I/O

Control

Interface

TMP431

TMP432

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

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Table 2. Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes)

TEMPERATURE REGISTER LOW BYTE VALUE (0.0625°C RESOLUTION)(1)

TEMP

(°C) STANDARD AND EXTENDED BINARY HEX

0 0000 0000 00

0.0625 0001 0000 10

0.1250 0010 0000 20

0.1875 0011 0000 30

0.2500 0100 0000 40

0.3125 0101 0000 50

0.3750 0110 0000 60

0.4375 0111 0000 70

0.5000 1000 0000 80

0.5625 1001 0000 90

0.6250 1010 0000 A0

0.6875 1011 0000 B0

0.7500 1100 0000 C0

0.8125 1101 0000 D0

0.8750 1110 0000 E0

0.9375 1111 0000 F0

(1) Resolution is 0.0625°C/count. All possible values are shown. configuration information, temperature measurement

results, temperature comparator maximum/minimum,

The TMP431/32 contain multiple registers for holding described in Figure 15 and in Table 3 for the

TMP431, and in Table 4 for the TMP432.

Figure 15. Internal Register Structure

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Table 3. TMP431 Register Map

POINTER ADDRESS

(HEX) BIT DESCRIPTIONS

POWER-ON REGISTER

READ WRITE RESET (HEX) D7 D6 D5 D4 D3 D2 D1 D0 DESCRIPTIONS

Local Temperature

00 NA(1) 00 LT11 LT10 LT9 LT8 LT7 LT6 LT5 LT4 (High Byte)

Remote

01 NA 00 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 Temperature (High

Byte)

02 NA 80 BUSY LHIGH LLOW RHIGH RLOW OPEN RTHRM LTHRM Status Register

Configuration

03 09 00 MASK SD AL/TH 0 0 RANGE 0 0 Register 1

Conversion Rate

04 0A 07 0 0 0 0 R3 R2 R1 R0 Register

Local Temperature

05 0B 55 LTH11 LTH10 LTH9 LTH8 LTH7 LTH6 LTH5 LTH4 High Limit (High

Byte)

Local Temperature

06 0C 00 LTL11 LTL10 LTL9 LTL8 LTL7 LTL6 LTL5 LTL4 Low Limit (High

Byte)

Remote

07 0D 55 RTH11 RTH10 RTH9 RTH8 RTH7 RTH6 RTH5 RTH4 Temperature High

Limit (High Byte)

Remote

08 0E 00 RTL11 RTL10 RTL9 RTL8 RTL7 RTL6 RTL5 RTL4 Temperature Low

Limit (High Byte)

NA 0F XX X(2) X X X X X X X One-Shot Start

Remote

10 NA 00 RT3 RT2 RT1 RT0 0 0 0 0 Temperature (Low

Byte)

Remote

13 13 00 RTH3 RTH2 RTH1 RTH0 0 0 0 0 Temperature High

Limit (Low Byte)

Remote

14 14 00 RTL3 RTL2 RTL1 RTL0 0 0 0 0 Temperature Low

Limit (Low Byte)

Local Temperature

15 NA 00 LT3 LT2 LT1 LT0 0 0 0 0 (Low Byte)

Local Temperature

16 16 00 LTH3 LTH2 LTH1 LTH0 0 0 0 0 High Limit (Low

Byte)

Local Temperature

17 17 00 LTL3 LTL2 LTL1 LTL0 0 0 0 0 Low Limit (Low

Byte)

18 18 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0 N-factor Correction

Remote THERM

19 19 55(3) RTHL7 RTHL6 RTHL5 RTHL4 RTHL3 RTHL2 RTHL1 RTHL0 Limit

Configuration

1A 1A 1C 0 0 0 REN LEN RC 0 0 Register 2

1F 1F 00 0 0 0 0 0 0 RIMASK LMASK Channel Mask

20 20 55(3) LTHL7 LTHL6 LTHL5 LTHL4 LTHL3 LTHL2 LTHL1 LTHL0 Local THERM Limit

21 21 0A TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0 THERM Hysteresis

Consecutive Alert

22 22 70 0 CTH2 CTH1 CTH0 CALT2 CALT1 CALT0 0 Register

Beta Range

25 25 08 0 0 0 0 BC3 BC2 BC1 BC0 Register

NA FC 00 X(4) X X X X X X X Software Reset

FD NA 31 0 0 1 1 0 0 0 1 TMP431 Device ID

FE NA 55 0 1 0 1 0 1 0 1 Manufacturer ID

(1) NA = Not applicable; register is write- or read-only.

(2) X = Indeterminate state.

(3) TMP431C and TMP431D versions have a power-on reset value of 69h.

(4) X = Undefined. Writing any value to this register initiates a software reset; see the Software Reset section.

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Table 4. TMP432 Register Map

POINTER ADDRESS BIT DESCRIPTIONS

POWER-ON REGISTER

READ WRITE RESET (HEX) D7 D6 D5 D4 D3 D2 D1 D0 DESCRIPTIONS

Local Temperature

00 NA(1) 00 LT11 LT10 LT9 LT8 LT7 LT6 LT5 LT4 (High Byte)

Remote

01 NA 00 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 Temperature1

(High Byte)

02 NA 80 BUSY 0 0 HIGH LOW OPEN THERM 0 Status Register

Configuration

03 09 00 MASK SD AL/TH 0 0 RANGE 0 0 Register1

Conversion Rate

04 0A 07 0 0 0 0 R3 R2 R1 R0 Register

Local Temperature

05 0B 55 LTH11 LTH10 LTH9 LTH8 LTH7 LTH6 LTH5 LTH4 High Limit (High

Byte)

Local Temperature

06 0C 00 LTL11 LTL10 LTL9 LTL8 LTL7 LTL6 LTL5 LTL4 Low Limit (High

Byte)

Remote

07 0D 55 RTH11 RTH10 RTH9 RTH8 RTH7 RTH6 RTH5 RTH4 Temperature1 High

Limit (High Byte)

Remote

08 0E 00 RTL11 RTL10 RTL9 RTL8 RTL7 RTL6 RTL5 RTL4 Temperature1 Low

Limit (High Byte)

NA 0F XX X(2) X X X X X X X One-Shot Start

Remote

10 NA 00 RT3 RT2 RT1 RT0 0 0 0 0 Temperature1 (Low

Byte)

Remote

13 13 00 RTH3 RTH2 RTH1 RTH0 0 0 0 0 Temperature1 High

Limit (Low Byte)

Remote

14 14 00 RTL3 RTL2 RTL1 RTL0 0 0 0 0 Temperature1 Low

Limit (Low Byte)

Remote

15 15 55 RTH11 RTH10 RTH9 RTH8 RTH7 RTH6 RTH5 RTH4 Temperature2 High

Limit (High Byte)

Remote

16 16 00 RTL11 RTL10 RTL9 RTL8 RTL7 RTL6 RTL5 RTL4 Temperature2 Low

Limit (High Byte)

Remote

17 17 00 RTH3 RTH2 RTH1 RTH0 0 0 0 0 Temperature2 High

Limit (Low Byte)

Remote

18 18 00 RTL3 RTL2 RTL1 RTL0 0 0 0 0 Temperature2 Low

Limit (Low Byte)

Remote Therm

19 19 55 RTHL7 RTHL6 RTHL5 RTHL4 RTHL3 RTHL2 RTHL1 RTHL0 Limit

Remote2 Therm

1A 1A 55 RTHL7 RTHL6 RTHL5 RTHL4 RTHL3 RTHL2 RTHL1 RTHL0 Limit

1B 1B 00 0 0 0 0 0 R2FAULT R1FAULT 0 Fault Status

1F 1F 00 0 0 0 0 0 R2MASK R1MASK LMASK Channel Mask

20 20 55 LTHL7 LTHL6 LTHL5 LTHL4 LTHL3 LTHL2 LTHL1 LTHL0 Local Therm Limit

Therm Limit

21 21 0A TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0 Hysteresis

Consecutive Alert

22 22 70 0 CTH2 CTH1 CTH0 CALT2 CALT1 CALT0 0 Register

Remote

23 NA 00 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 Temperature2

(High Byte)

Remote

24 NA 00 RT3 RT2 RT1 RT0 0 0 0 0 Temperature2 (Low

Byte)

Ch. 1 Beta Range

25 25 08 0 0 0 0 BC3 BC2 BC1 BC0 Selection

Ch. 2 Beta Range

26 26 08 0 0 0 0 BC3 BC2 BC1 BC0 Selection

N-factor Correction

27 27 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0 Remote1

(1) NA = Not applicable; register is write- or read-only.

(2) Indeterminate state.

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Table 4. TMP432 Register Map (continued)

POINTER ADDRESS BIT DESCRIPTIONS

POWER-ON REGISTER

READ WRITE RESET (HEX) D7 D6 D5 D4 D3 D2 D1 D0 DESCRIPTIONS

N-factor Correction

28 28 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0 Remote2

Local Temperature

29 NA 00 T3 T2 T1 T0 0 0 0 0 (Low Byte)

35 35 00 0 0 0 0 0 R2HIGH R1HIGH LHIGH High Limit Status

36 36 00 0 0 0 0 0 R2LOW R1LOW LLOW Low Limit Status

37 37 00 0 0 0 0 0 R2THERM R1THERM LTHERM Therm Status

Local Temperature

3D 3D 00 LTH3 LTH2 LTH1 LTH0 0 0 0 0 High Limit (Low

Byte)

Local Temperature

3E 3E 00 LTL3 LTL2 LTL1 LTL0 0 0 0 0 Low Limit (Low

Byte)

Configuration

3F 3F 3C 0 0 REN2 REN LEN RC 0 0 Register2

NA FC 00 X(3) X X X X X X X Software Reset

FD NA 32 0 0 1 1 0 0 1 0 TMP432 Device ID

FE NA 55 0 1 0 1 0 1 0 1 Manufacturer ID

(3) X = Undefined. Writing any value to this register initiates a software reset; see the Software Reset section.

space

Pointer Register The TMP431/32 contain circuitry to assure that a low

byte register read command returns data from the

Figure 15 shows the internal register structure of the same ADC conversion as the immediately preceding

TMP431/32. The 8-bit Pointer Register is used to high byte read command. This assurance remains

address a given data register. The Pointer Register valid only until another register is read. For proper

identifies which of the data registers should respond operation, the high byte of a temperature register

to a read or write command on the Two-Wire bus. should be read first. The low byte register should be

This register is set with every write command. A write read in the next read command. The low byte register

command must be issued to set the proper value in may be left unread if the LSBs are not needed.

the Pointer Register before executing a read Alternatively, the temperature registers may be read

command. Table 3 describes the pointer address of as a 16-bit register by using a single two-byte read

the registers available in the TMP431. Table 4 command from address 00h for the local channel

describes the address of the registers available in the result, or from address 01h for the remote channel

TMP432. The power-on reset (POR) value of the result (23h for the second remote channel result).

Pointer Register is 00h (0000 0000b). The high byte is output first, followed by the low byte.

Both bytes of this read operation are from the same

Temperature Registers ADC conversion. The power-on reset value of both

The TMP431 has four 8-bit registers that hold temperature registers is 00h.

temperature measurement results. The TMP432 has

six 8-bit registers that hold temperature measurement Limit Registers

results. Both the local channel and the remote The TMP431/32 have registers for setting comparator

channel have a high byte register that contains the limits for both the local and remote measurement

most significant bits (MSBs) of the temperature channels. These registers have read and write

analog-to-digital converter (ADC) result and a low capability. The High and Low Limit Registers for both

byte register that contains the least significant bits channels span two registers, as do the temperature

(LSBs) of the temperature ADC result. The local registers. The local temperature high limit is set by

channel high byte address for the TMP431/32 is 00h; writing the high byte to pointer address 0Bh and

the local channel low byte address is 15h for the writing the low byte to pointer address 16h for the

TMP431 and 29h for the TMP432. The remote TMP431 and 3Dh for the TMP432, or by using a

channel high byte is at address 01h; the remote single two-byte write command (high byte first) to

channel low byte address is 10h. For the TMP432, pointer address 0Bh.

the second remote channel high byte address is 23h;

the second remote channel low byte is 24h. These

registers are read-only and are updated by the ADC

each time a temperature measurement is completed.

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The local temperature high limit is obtained by two-byte read command from pointer address 15h.

reading the high byte from pointer address 05h and The power-on reset value of the Remote

the low byte from pointer address 16h for the Temperature High Limit Register is 55h/00h (+85°C in

TMP4341 and 3Dh for the TMP432, or by using a standard temperature mode; +21°C in extended

two-byte read command from pointer address 05h. temperature mode).

The power-on reset value of the local temperature The remote temperature2 low limit for the TMP432 is

high limit is 55h/00h (+85°C in standard temperature set by writing the high byte to pointer address 16h

mode; +21°C in extended temperature mode). and writing the low byte to pointer address 18h, or by

Similarly, the local temperature low limit is set by using a two-byte write to pointer address 16h. The

writing the high byte to pointer address 0Ch and remote temperature low limit is read by reading the

writing the low byte to pointer address 17h for the high byte from pointer address 16h and the low byte

TMP431 and 3Eh for the TMP432, or by using a from pointer address 18h, or by using a two-byte read

single two-byte write command to pointer address from pointer address 16h. The power-on reset value

0Ch. The local temperature low limit is read by of the Remote Temperature Low Limit Register is

reading the high byte from pointer address 06h and 00h/00h (0°C in standard temperature mode; –64°C

the low byte from pointer address 17h and 3Eh for in extended mode).

the TMP432, or by using a two-byte read from pointer The TMP431/32 also have a THERM limit register for

address 06h. The power-on reset value of the local both the local and the remote channels. These

temperature low limit register is 00h/00h (0°C in registers are eight bits and allow for THERM limits set

standard temperature mode; –64°C in extended to 1°C resolution. The local channel THERM limit is

mode). set by writing to pointer address 20h. The remote

The remote temperature high limit for the TMP431 channel THERM limit is set by writing to pointer

(remote temperature1 high limit for the TMP432) is address 19h. The remote channel THERM2 limit for

set by writing the high byte to pointer address 0Dh the TMP432 is set by writing to pointer address 1Ah.

and writing the low byte to pointer address 13h, or by The local channel THERM limit is obtained by reading

using a two-byte write command to pointer address from pointer address 20h; the remote channel

0Dh. The remote temperature high limit is obtained THERM limit is read by reading from pointer address

by reading the high byte from pointer address 07h 19h. The remote channel THERM2 limit is read by

and the low byte from pointer address 13h, or by reading from pointer address 1Ah. The power-on

using a two-byte read command from pointer address reset value of the THERM limit registers is 55h for the

07h. The power-on reset value of the Remote TMP431A, TMP431B, TMP432A, and TMP432B

Temperature High Limit Register is 55h/00h (+85°C in (+85°C in standard temperature mode; +21°C in

standard temperature mode; +21°C in extended extended temperature mode). The power-on reset

temperature mode). value of the THERM limit registers is 69h for the

The remote temperature low limit for the TMP431 TMP431C and TMP431D (+105°C in standard

(remote temperature1 low limit for the TMP432) is set temperature mode; +41°C in extended temperature

by writing the high byte to pointer address 0Eh and mode). The THERM limit comparators also have

writing the low byte to pointer address 14h, or by hysteresis. The hysteresis of both comparators is set

using a two-byte write to pointer address 0Eh. The by writing to pointer address 21h. The hysteresis

remote temperature low limit is read by reading the value is obtained by reading from pointer address

high byte from pointer address 08h and the low byte 21h. The value in the Hysteresis Register is an

from pointer address 14h, or by using a two-byte read unsigned number (always positive). The power-on

from pointer address 08h. The power-on reset value reset value of this register is 0Ah (+10°C).

of the Remote Temperature Low Limit Register is Whenever changing between standard and extended

00h/00h (0°C in standard temperature mode; –64°Ctemperature ranges, be aware that the temperatures

in extended mode). stored in the temperature limit registers are NOT

The remote temperature2 high limit for the TMP432 is automatically reformatted to correspond to the new

set by writing the high byte to pointer address 15h temperature range format. These values must be

and writing the low byte to pointer address 17h, or by reprogrammed in the appropriate binary or extended

using a two-byte write command to pointer address binary format.

15h. The remote temperature high limit is obtained by

reading the high byte from pointer address 15h and

the low byte from pointer address 17h, or by using a

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Status Registers

TMP431 Status Register

Table 5. TMP431 Status Register Format

TMP431 STATUS REGISTER (Read = 02h, Write = NA)

BIT # D7 D6 D5 D4 D3 D2 D1 D0

BIT NAME BUSY LHIGH LLOW RHIGH RLOW OPEN RTHRM LTHRM

POR VALUE 0(1) 0000000

(1) The BUSY bit changes to ‘1’almost immediately (<< 100μs) following power-up, as the TMP431 begins the first temperature conversion.

It is high whenever the TMP431 is converting a temperature reading.

space

The TMP431 has a Status Register to report the state The RHIGH bit reads as ‘1’if the remote temperature

of the temperature comparators. Table 5 shows the has exceeded the remote high limit and remains

Status Register bits. The Status Register is read-only greater than the remote high limit less the value in

and is read by reading from pointer address 02h. the Hysteresis Register.

The BUSY bit reads as ‘1’if the ADC is making a The LLOW and RLOW bits are not affected by the

conversion. It reads as ‘0’if the ADC is not AL/TH bit. The LLOW bit reads as ‘1’if the local low

converting. limit was exceeded since the last clearing of the

The OPEN bit reads as ‘1’if the remote transistor Status Register. The RLOW bit reads as ‘1’if the

was detected as open since the last read of the remote low limit was exceeded since the last clearing

Status Register. The OPEN status is only detected of the Status Register.

when the ADC is attempting to convert a remote The values of the LLOW, RLOW, and OPEN (as well

temperature. as LHIGH and RHIGH when AL/TH is ‘0’) are latched

The RTHRM bit reads as ‘1’if the remote and read as ‘1’until the Status Register is read or a

temperature exceeds the remote THERM limit and device reset occurs. These bits are cleared by

remains greater than the remote THERM limit less reading the Status Register, provided that the

the value in the shared Hysteresis Register; see condition causing the flag to be set no longer exists.

Figure 21. The values of BUSY, LTHRM, and RTHRM (as well

as LHIGH and RHIGH when ALERT/THERM2 is ‘1’)

The LTHRM bit reads as ‘1’if the local temperature are not latched and are not cleared by reading the

exceeds the local THERM limit and remains greater Status Register. They always indicate the current

than the local THERM limit less the value in the state, and are updated appropriately at the end of the

shared Hysteresis Register; see Figure 21.corresponding ADC conversion. Clearing the Status

The LHIGH and RHIGH bit values depend on the pin; an SMBus alert response address command

state of the AL/TH bit in the Configuration Register 1. must be used to clear the ALERT pin.

If the AL/TH bit is ‘0’, the LHIGH bit reads as ‘1’if the

local high limit was exceeded since the last clearing The TMP431 NORs LHIGH, LLOW, RHIGH, RLOW,

of the Status Register. The RHIGH bit reads as ‘1’if and OPEN, so a status change for any of these flags

the remote high limit was exceeded since the last from ‘0’to ‘1’automatically causes the ALERT pin to

clearing of the Status Register. If the AL/TH bit is ‘1’,go low (only applies when the ALERT/THERM2 pin is

the remote high limit and the local high limit are used configured for ALERT mode).

to implement a THERM2 function. LHIGH reads as ‘1’

if the local temperature exceeds the local high limit

and remains greater than the local high limit less the

value in the Hysteresis Register.

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Status Registers (continued)

TMP432 Status Register

Table 6. TMP432 Status Register Format

TMP432 STATUS REGISTER (Read = 02h, Write = NA)

BIT # D7 D6 D5 D4 D3 D2 D1 D0

BIT NAME BUSY 0 0 HIGH LOW OPEN THERM 0

POR VALUE 0(1) 0000000

(1) The BUSY bit changes to ‘1’almost immediately (<< 100μs) following power-up, as the TMP432 begins the first temperature conversion.

It is high whenever the TMP432 is converting a temperature reading.

space

The TMP432 has a Status Register to report the state The AL/TH bit does not affect the Status Register

of the temperature comparators. Table 6 shows the LOW bit. The LOW bit reads as '1' if any of the

Status Register bits. The Status Register is read-only temperature channels go beyond the programmed

and is read by reading from pointer address 02h. low limit since the last clearing of the Status Register.

The BUSY bit reads as ‘1’if the ADC is making a The values of the LOW and OPEN bits (as well as

conversion. It reads as ‘0’if the ADC is not HIGH when AL/TH is '0') are latched and read as '1'

converting. until the Status Register is read or a device reset

occurs. These bits are cleared by reading the Status

The OPEN bit reads as ‘1’if the remote transistor Register, if the condition causing the flag to be set no

was detected as open since the last read of the longer exists.

Status Register. The OPEN status is only detected

when the ADC is attempting to convert a remote The values of BUSY and THERM (as well as HIGH

temperature. when AL/TH is ‘1’) are not latched and are not

cleared by reading the Status Register. They always

The THERM bit reads as '1' if the temperature from indicate the current state, and are updated

any channel (remote or local) has exceeded the appropriately at the end of the corresponding ADC

THERM limit and remains greater than the THERM conversion. Clearing the Status Register bits does not

limit less the value in the shared Hysteresis Register; clear the state of the ALERT pin; an SMBus alert

see Figure 21.response address command must be used to clear

the ALERT pin.

The HIGH bit value depends on the state of the

AL/TH bit in the Configuration Register 1. If the The TMP432 NORs HIGH, LOW, and OPEN, so a

AL/TH bit is '0', the HIGH bit reads '1' if any of the status change for any of these flags from ‘0’to ‘1’

temperature channels go beyond the programmed automatically causes the ALERT pin to go low (only

high limit since the last clearing of the Status applies when the ALERT/THERM2 pin is configured

to implement THERM2 function. The HIGH bit reads

as '1' if the temperature exceeds the high limit less

the value in the Hysteresis Register.

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Configuration Register 1 The AL/TH bit (bit 5) controls whether the ALERT pin

functions in ALERT mode or THERM2 mode. If

The Configuration Register 1 sets the temperature AL/TH = 0, the ALERT pin operates as an interrupt

range, controls shutdown mode, and determines how pin. In this mode, the ALERT pin goes low after the

the ALERT/THERM2 pin functions. The Configuration set number of consecutive out-of-limit temperature

read by reading from pointer address 03h. If AL/TH = 1, the ALERT/THERM2 pin implements a

The MASK bit (bit 7) enables or disables the ALERT THERM function (THERM2). In this mode, THERM2

pin output if ALERT/THERM = 0. If ALERT/THERM = functions similar to the THERM pin except that the

1 then the MASK bit has no effect. If MASK is set to local high limit and remote high limit registers are

‘0’, the ALERT pin goes low when one of the used for the thresholds. THERM2 goes low when

temperature measurement channels exceeds its high either RHIGH or LHIGH is set.

or low limits for the chosen number of consecutive

conversions. If the MASK bit is set to ‘1’, the The temperature range is set by configuring bit 2 of

TMP431/32 retain the ALERT pin status, but the the Configuration Register 1. Setting this bit low

ALERT pin does not go low. configures the TMP431/32 for the standard

measurement range (0°C to +127°C); temperature

The shutdown (SD) bit (bit 6) enables or disables the conversions will be stored in the standard binary

temperature measurement circuitry. lf SD = 0, the format. Setting bit 2 high configures the TMP431/32

TMP431/32 convert continuously at the rate set in the for the extended measurement range (–55°C to

conversion rate register. When SD is set to '1', the +150°C); temperature conversions are stored in the

TMP431/32 immediately stop converting and enter a extended binary format (see Table 1).

shutdown mode. When SD is set to '0' again, the

TMP431/32 resume continuous conversions. A single The remaining bits of the Configuration Register 1 are

conversion can be started when SD = 1 by writing to reserved and must always be set to ‘0’. The power-on

the One-Shot Register. reset value for this register is 00h. Table 7

summarizes the bits of the Configuration Register 1.

Table 7. Configuration Register 1 Bit Descriptions

CONFIGURATION REGISTER 1

(Read = 03h, Write = 09h, POR = 00h)

BIT NAME FUNCTION POWER-ON RESET VALUE

0 = ALERT Enabled

7 MASK 0

1 = ALERT Masked

0 = Run

6 SD 0

1 = Shut Down

0 = ALERT Mode

5 AL/TH 0

1 = THERM Mode

4, 3 Reserved —0

0 = 0°C to +127°C

2 Temperature Range 0

1 = −55°C to +150°C

1, 0 Reserved —0

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Configuration Register 2 The LEN bit enables the local temperature

measurement channel. If LEN = '1', the local channel

Configuration Register 2 (pointer address 1Ah for the is enabled; if LEN = '0', the local channel is disabled.

TMP431 and 3Fh for the TMP432) controls which

temperature measurement channels are enabled and The REN bit enables external temperature

whether the external channels have the resistance measurement channel 1 (connected to pins 2 and 3.)

correction feature enabled or not. If REN = '1', the external channel is enabled; if REN =

'0', the external channel is disabled.

The RC bit enables the resistance correction feature

for the external temperature channels. If RC = '1', For the TMP432 only, the REN2 bit enables the

series resistance correction is enabled; if RC = '0', second external measurement channel (connected to

resistance correction is disabled. Resistance pins 4 and 5). If REN2 = '1', the second external

correction should be enabled for most applications. channel is enabled; if REN2 = '0', the second external

However, disabling the resistance correction may channel is disabled.

yield slightly improved temperature measurement The temperature measurement sequence is local

noise performance, and reduce conversion time by channel, external channel 1, external channel 2,

about 50%, which could lower power consumption shutdown, and delay (to set conversion rate, if

when conversion rates of two per second or less are necessary). The sequence starts over with the local

selected. channel. If any of the channels are disabled, they are

skipped in the sequence. Table 8 summarizes the

bits of Configuration Register 2.

Table 8. Configuration Register 2 Bit Descriptions

CONFIGURATION REGISTER 2

(Read/Write = 1A for TMP431 3F for TMP432; POR = 1Ch for TMP431; 3Ch for TMP432)

BIT NAME FUNCTION POWER-ON RESET VALUE

7, 6 Reserved —0

0 = External channel 2 disabled 1 (TMP432)

5 REN2 1 = External channel 2 enabled 0 (TMP431)

0 = External channel 1 disabled

4 REN 1

1 = External channel 1 enabled

0 = Local channel disabled

3 LEN 1

1 = Local channel enabled

0 = Resistance correction

disabled

2 RC 1

1 = Resistance correction

enabled

1, 0 Reserved —0

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Conversion Rate Register TMP431/32 return to shutdown mode when that

conversion completes. The value of the data sent in

The Conversion Rate Register (pointer address 0Ah) the write command is irrelevant and is not stored by

controls the rate at which temperature conversions the TMP431/32. When the TMP431/32 are in

are performed. This register adjusts the idle time shutdown mode, an initial 200ps is required before a

between conversions but not the conversion timing one-shot command can be given. (Note: When a

itself, thereby allowing the TMP431/32 power shutdown command is issued, the TMP431/32 shut

dissipation to be balanced with the temperature down immediately, aborting the current conversion.)

rate options and corresponding current consumption. following shutdown. One-shot commands can be

issued without delay thereafter.

One-Shot Conversions

When the TMP431/32 are in shutdown mode (SD = 1

in the Configuration Register 1), a single conversion

on both channels is started by writing any value to

the One-Shot Start Register, pointer address 0Fh.

This write operation starts one conversion; the

Table 9. Conversion Rate Register

CONVERSION RATE REGISTER (Read = 04h, Write = 0Ah, POR = 07h)

AVERAGE IQ(TYP)

(μA)

R7 R6 R5 R4 R3 R2 R1 R0 CONVERSION/SEC VS= 2.7V VS= 5.5V

0 0 0 0 0 0 0 0 0.0625 11 32

0 0 0 0 0 0 0 1 0.125 17 38

0 0 0 0 0 0 1 0 0.25 28 49

0 0 0 0 0 0 1 1 0.5 47 69

0 0 0 0 0 1 0 0 1 80 103

0 0 0 0 0 1 0 1 2 128 155

0 0 0 0 0 1 1 0 4 190 220

07h to 0Fh 8 373 413

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Beta Compensation Configuration Register continue to be GND collector-connected in this mode,

but no beta compensation factor is applied. When the

If the Beta Compensation Configuration Register is beta correction is set to '0111' or the sensor is

set to '1xxx' (beta correction enabled) for a given diode-connected (base shorted to collector), the

remote channel at the beginning of each temperature η-factor used by the TMP431/32 is 1.008. When the

conversion, the TMP431/32 automatically detect if the beta correction configuration is set to '1xxx' (beta

sensor is diode-connected or GND correction enabled) and the sensor is GND

collector-connected, select the proper beta range, collector-connected (PNP collector to ground), the

and measure the sensor temperature appropriately. η-factor used by the TMP431/32 is 1.000. Table 10

shows the read value for the selected beta ranges

If the Beta Compensation Configuration Register is and the appropriate η-factor used for each

set to '0111' (beta correction disabled) for a given conversion.

channel, the automatic detection is bypassed and the

temperature is measured assuming a

diode-connected sensor. A PNP transistor may

Table 10. Beta Compensation Configuration Register

BCx3-BCx0 BETA RANGE DESCRIPTION η-FACTOR TIME

1000 Automatically selected range 0 (0.10 <beta <0.18) 1.000 126ms

1001 Automatically selected range 1 (0.16 <beta <0.26) 1.000 126ms

1010 Automatically selected range 2 (0.24 <beta <0.43) 1.000 126ms

1011 Automatically selected range 3 (0.35 <beta <0.78) 1.000 126ms

1100 Automatically selected range 4 (0.64 <beta <1.8) 1.000 126ms

1101 Automatically selected range 5 (1.4 <beta <9.0) 1.000 126ms

1110 Automatically selected range 6 (6.7 <beta <40.0) 1.000 126ms

1111 Automatically selected range 7 (beta >27.0) 1.000 126ms

1111 Automatically detected diode connected sensor 1.008 93ms

0000 Manually selected range 0 (0.10 <beta <0.5) 1.000 93ms

0001 Manually selected range 1 (0.13 <beta <1.0) 1.000 93ms

0010 Manually selected range 2 (0.18 <beta <2.0) 1.000 93ms

0011 Manually selected range 3 (0.3 <beta <25) 1.000 93ms

0100 Manually selected range 4 (0.5 <beta <50) 1.000 93ms

0101 Manually selected range 5 (1.1 <beta <100) 1.000 93ms

0110 Manually selected range 6 (2.4 <beta <150) 1.000 93ms

0111 Manually disabled beta correction 1.008 93ms

Product Folder Link(s): TMP431 TMP432

V V =-

BE2 BE1 ln

hkT

()

1.008 300

300 N

-ADJUST

heff =

300 1.008´

heff

NADJUST =300 -

1.000 300

300 N

-ADJUST

heff =

300 1.000´

heff

NADJUST =300 -

TMP431

TMP432

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SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

η-Factor Correction Register η-correction value may be written to and read from

pointer address 27h. The η-correction value for the

The TMP431/32 allow for a different η-factor value to second remote channel is read to and written from

be used for converting remote channel pointer address 28h. The register power-on reset

measurements to temperature. The remote channel value is 00h, thus having no effect unless written to.

uses sequential current excitation to extract a

differential VBE voltage measurement to determine Table 11. η-Factor Range

the temperature of the remote transistor. Equation 1 NADJUST

relates this voltage and temperature. BINARY HEX DECIMAL η

01111111 7F 127 1.747977

(1) 00001010 0A 10 1.042759

The value ηin Equation 1 is a characteristic of the 00001000 08 8 1.035616

particular transistor used for the remote channel. 00000110 06 6 1.028571

When the beta compensation configuration is set to 00000100 04 4 1.021622

'0111' (beta compensation disabled) or the sensor is

diode-connected (base shorted to collector), the 00000010 02 2 1.014765

η-factor used by the TMP431/32 is 1.008. When the 00000001 01 1 1.011371

beta compensation configuration is set to '1000' (beta 00000000 00 0 1.008

compensation enabled) and the sensor is GND 11111111 FF –1 1.004651

collector-connected (PNP collector to ground), the 11111110 FE –2 1.001325

η-factor used by the TMP431/32 is 1.000. If the

η-factor used for the temperature conversion does not 11111100 FC –4 0.994737

match the characteristic of the sensor, then 11111010 FA –6 0.988235

temperature offset is observed. The value in the 11111000 F8 –8 0.981818

η-Factor Correction Register may be used to adjust 11110110 F6 –10 0.975484

the effective η-factor according to Equation 2 and 10000000 80 –128 0.706542

Equation 3 for disabled beta compensation or a

diode-connected sensor. Equation 4 and Equation 5 space

may be used for enabled beta compensation and a

GND collector-connected sensor. Software Reset

The TMP431/32 may be reset by writing any value to

(2) Pointer Register FCh. This action restores the

power-on reset state to all of the TMP431/32

(3) registers as well as abort any conversion in process

and clear the ALERT and THERM pins.

(4) The TMP431/32 also support reset via the two-wire

general call address (00000000). The TMP431/32

acknowledge the general call address and respond to

(5) the second byte. If the second byte is 00000110, the

TMP431/32 execute a software reset. The

The η-correction value must be stored in TMP431/32 do not respond to other values in the

twos-complement format, yielding an effective data second byte.

range from –128 to +127. Table 11 shows the

η-factor range for both 1.008 and 1.000. For the

TMP431, the η-correction value may be written to and

read from pointer address 18h. For the TMP432, the

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Consecutive Alert Register Identification Registers

The value in the Consecutive Alert Register (address The TMP431/32 allow for the Two-Wire bus controller

22h) determines how many consecutive out-of-limit to query the device for manufacturer and device IDs

measurements must occur on a measurement to enable the device for software identification of the

channel before the ALERT or the THERM signal is device at the particular Two-Wire bus address. The

activated. The value in this register does not affect manufacturer ID is obtained by reading from pointer

bits in the Status Register. Values of one, two, three, address FEh. The TMP431/32 both return 55h for the

or four consecutive conversions can be selected; one manufacturer code. The device ID is obtained by

conversion is the default. This function allows reading from pointer address FDh. The TMP431

additional filtering for the ALERT or the THERM pin. returns 31h for the device ID and the TMP432 returns

Table 14 shows the consecutive alert bits. For bit 32h for the device ID (see Table 3 and Table 4).

descriptions, refer to Table 12. These registers are read-only.

Table 12. Consecutive Alert Register Bit Table 13. Allowable THERM Hysteresis Values

Descriptions THERM HYSTERESIS VALUE

BIT NAME NUMBER OF TH[7:0]

CONSECUTIVE TEMPERATURE (STANDARD

OUT-OF-LIMIT (°C) BINARY) (HEX)

MEASUREMENTS 0 0000 0000 00

CALT2/CTH2 CALT1/CTH1 CALT0/CTH0 (ALERT/THERM) 1 0000 0001 01

0 0 0 1 5 0000 0101 05

0 0 1 2 10 0000 1010 0A

0 1 1 3 25 0001 1001 19

1 1 1 4 50 0011 0010 32

.75 0100 1011 4B

100 0110 0100 64

Therm Hysteresis Register 125 0111 1101 7D

The THERM Hysteresis Register, shown in Table 15,127 0111 1111 7F

stores the hysteresis value used for the THERM pin 150 1001 0110 96

alarm function. This register must be programmed 175 1010 1111 AF

with a value that is less than the Local Temperature 200 1100 1000 C8

High Limit Register value, Remote Temperature High

Limit Register value, Local THERM Limit Register 225 1110 0001 E1

value, or Remote THERM Limit Register value; 255 1111 1111 FF

otherwise, the respective temperature comparator

does not trip on the measured temperature falling

edges. Allowable hysteresis values are shown in

Table 13. The default hysteresis value is 10°C,

whether the device is operating in the standard or

extended mode setting.

Table 14. Consecutive Alert Register Format

CONSECUTIVE ALERT REGISTER

(READ = 22h, WRITE = 22h, POR = 70h)

BIT # D7 D6 D5 D4 D3 D2 D1 D0

BIT NAME 0 CTH2 CTH1 CTH0 CALT2 CALT1 CALT0 0

POR VALUE 01110000

Table 15. THERM Hysteresis Register Format

THERM HYSTERESIS REGISTER

(Read = 21h, Write = 21h, POR = 0Ah)

BIT # D7 D6 D5 D4 D3 D2 D1 D0

BIT NAME TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0

POR VALUE 00001010

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Bus Overview Read/Write Operations

The TMP431/32 are SMBus interface-compatible. In Accessing a particular register on the TMP431/32 is

SMBus protocol, the device that initiates the transfer accomplished by writing the appropriate value to the

is called a master, and the devices controlled by the Pointer Register. The value for the Pointer Register is

master are slaves. The bus must be controlled by a the first byte transferred after the slave address byte

master device that generates the serial clock (SCL), with the R/W bit low. Every write operation to the

controls the bus access, and generates the START TMP431/32 require a value for the Pointer Register

and STOP conditions. (see Figure 17).

To address a specific device, a START condition is When reading from the TMP431/32, the last value

initiated. START is indicated by pulling the data line stored in the Pointer Register by a write operation is

(SDA) from a high to low logic level while SCL is used to determine which register is read by a read

high. All slaves on the bus shift in the slave address operation. To change the register pointer for a read

byte, with the last bit indicating whether a read or operation, a new value must be written to the Pointer

write operation is intended. During the ninth clock Register. This transaction is accomplished by issuing

pulse, the slave being addressed responds to the a slave address byte with the R/W bit low, followed

master by generating an Acknowledge and pulling by the Pointer Register byte. No additional data are

SDA low. required. The master can then generate a START

condition and send the slave address byte with the

Data transfer is then initiated and sent over eight R/W bit high to initiate the read command. See

clock pulses followed by an Acknowledge bit. During Figure 18 for details of this sequence. If repeated

data transfer SDA must remain stable while SCL is reads from the same register are desired, it is not

high, because any change in SDA while SCL is high necessary to continually send the Pointer Register

is interpreted as a control signal. bytes, because the TMP431/32 retain the Pointer

Once all data have been transferred, the master operation. Note that register bytes are sent MSB first,

generates a STOP condition. STOP is indicated by followed by the LSB.

pulling SDA from low to high, while SCL is high.

TIMING DIAGRAMS

Serial Interface The TMP431/32 are Two-Wire and

The TMP431/32 operate only as slave devices on SMBus-compatible. Figure 16 to Figure 20 describe

either the Two-Wire bus or the SMBus. Connections the various operations on the TMP431/32. Bus

to either bus are made via the open-drain I/O lines, definitions are given below. Parameters for Figure 16

SDA and SCL. The SDA and SCL pins feature are defined in Table 16.

integrated spike suppression filters and Schmitt

triggers to minimize the effects of input spikes and Bus Idle: Both SDA and SCL lines remain high.

bus noise. The TMP431/32 support the transmission

protocol for fast (1kHz to 400kHz) and high-speed Start Data Transfer: A change in the state of the

(1kHz to 3.4MHz) modes. All data bytes are SDA line, from high to low, while the SCL line is high,

transmitted MSB first. defines a START condition. Each data transfer is

initiated with a START condition.

Serial Bus Address Stop Data Transfer: A change in the state of the

SDA line from low to high while the SCL line is high

To communicate with the TMP431/32, the master defines a STOP condition. Each data transfer

must first address slave devices via a slave address terminates with a STOP or a repeated START

byte. The slave address byte consists of seven condition.

address bits, and a direction bit that indicates the

intent of executing a read or write operation. Data Transfer: The number of data bytes transferred

between a START and a STOP condition is not

The address of the TMP431A/32A/31C is 4Ch limited and is determined by the master device. The

(1001100b). The address of the TMP431B/32B/31D receiver acknowledges the transfer of data.

is 4Dh (1001101b).

Product Folder Link(s): TMP431 TMP432

SCL

SDA

t(LOW) tRtFt(HDSTA)

t(HDSTA)

t(HDDAT)

t(BUF)

t(SUDAT)

t(HIGH) t(SUSTA) t(SUSTO)

P S S P

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Acknowledge: Each receiving device, when period of the Acknowledge clock pulse. Setup and

addressed, is obliged to generate an Acknowledge hold times must be taken into account. On a master

bit. A device that acknowledges must pull down the receive, data transfer termination can be signaled by

SDA line during the Acknowledge clock pulse in such the master generating a Not-Acknowledge on the last

a way that the SDA line is stable low during the high byte that has been transmitted by the slave.

Figure 16. Two-Wire Timing Diagram

Table 16. Timing Diagram Definitions for Figure 16

FAST MODE HIGH-SPEED MODE

PARAMETER MIN MAX MIN MAX UNITS

SCL Operating Frequency f(SCL) 0.001 0.4 0.001 3.4 MHZ

Bus Free Time Between STOP ns

t(BUF) 600 160

and START Condition

Hold time after repeated START

condition. After this period, the t(HDSTA) 100 100 ns

first clock is generated.

Repeated START Condition Setup t(SUSTA) 100 100 ns

Time

STOP Condition Setup Time t(SUSTO) 100 100 ns

Data Hold Time t(HDDAT) 0(1) 0(2) ns

Data Setup Time t(SUDAT) 100 10 ns

SCL Clock LOW Period t(LOW) 1300 160 ns

SCL Clock HIGH Period t(HIGH) 600 60 ns

Clock/Data Fall Time tF300 160 ns

Clock/Data Rise Time 300 160 ns

for SCLK ≤100kHz 1000 ns

(1) For cases with fall time of SCL less than 20ns and/or the rise time or fall time of SDA less than 20ns, the hold time should be greater

than 20ns.

(2) For cases with fall time of SCL less than 10ns and/or the rise or fall time of SDA less than 10ns, the hold time should be greater than

10ns.

Product Folder Link(s): TMP431 TMP432

Frame 1 Two- Wire Slave Address Byte Frame 2 Pointer Register Byte

Frame 4 Data Byte 2

Start By

Master

ACK By

TMP431 A/31CA/32

ACK By

TMP431 A/31CA/32

ACK By

TMP431 A/

31C

A/32

Stop By

Master

1 9 1

D7 D6 D5 D4 D3 D2 D1 D0

Frame 3 Data Byte 1

ACK By

TMP431 A/31CA/32

SDA

(Continued)

SCL

(Continued)

D6 D5 D4 D3 D2 D1 D0

SDA

SCL

0 0 1 1 0 0(1) R/W P7 P6 P5 P4 P3 P2 P1 P0

NOTE (1): Slave address 1001100 (TMP431A/32A/31C) shown. Slave address changes for TMP431B/32B/31D. See table for more details.Ordering Information

Frame 1 Two-Wire Slave Address Byte Frame 2 Pointer Register Byte

Start By

Master

ACK By

TMP431A/32A/31C

ACK By

TMP431 A/31CA/32

Frame 3 Two-Wire Slave Address Byte Frame 4 Data Byte 1 Read Register

Start By

Master

ACK By

TMP431 A/31CA/32

NACK By

Master(2)

From

TMP431 A/31CA/32

1 9 1 9

SDA

SCL

0 0 1 R/WP7 P6 P5 P4 P3 P2 P1 P0

SDA

(Continued)

SCL

(Continued)

1 0 0 1

1 0 0(1)

1 0 0(1) R/WD7 D6 D5 D4 D3 D2 D1 D0

(1) Slave address 1001100 (TMP431A/32A/31C) shown. Slave address changes for TMP431B/32B/31D. See table for more details.Ordering Information

(2) Master should leave SDA high to terminate a single-byte read operation.

NOTES:

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Figure 17. Two-Wire Timing Diagram for Write Word Format

Figure 18. Two-Wire Timing Diagram for Single-Byte Read Format

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Frame 1 Two-Wire Slave Address Byte Frame 2 Pointer Register Byte

Start By

Master

ACK By

TMP431 A/31CA/32

ACK By

TMP431 A/31CA/32

Frame 3 Two-Wire Slave Address Byte Frame 4 Data Byte 1 Read Register

Start By

Master

ACK By

TMP431 A/31CA/32

ACK By

Master

From

TMP431 A/31CA/32

1 9 1 9

SDA

SCL

0 0 1 R/W P7 P6 P5 P4 P3 P2 P1 P0

SDA

(Continued)

SCL

(Continued)

SDA

(Continued)

SCL

(Continued)

1 0 0 1

1 0 0(1)

1 0 0(1) R/W D7 D6 D5 D4 D3 D2 D1 D0

Frame 5 Data Byte 2 Read Register

Stop By

Master

NACK By

Master(2)

From

TMP431 A/31CA/32

1 9

D7 D6 D5 D4 D3 D2 D1 D0

(1) Slave address 1001100 (TMP431A/32A/31C) shown. Slave address changes for TMP431B/32B/31D. See table for more details.Ordering Information

(2) Master should leave SDA high to terminate a two-byte read operation.

NOTES:

Frame 1 SMBus ALERT Response Address Byte Frame 2 Slave Address Byte

Start By

Master

ACK By

TMP431A/32A/31C

From

TMP431A/32A/31C

NACK By

Master

Stop By

Master

1 9 1 9

SDA

SCL

ALERT

0 0 0 1 1 0 0 R/W 1 0 0 1 1 0 0(1) Status

NOTE (1): Slave address 1001100 (TMP431A/32A/31C) shown. Slave address changes for TMP431B/32B/31D. See table for more details.Ordering Information

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Figure 19. Two-Wire Timing Diagram for Two-Byte Read Format

Figure 20. Timing Diagram for SMBus ALERT

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High-Speed Mode Hysteresis Register. The allowable values of

hysteresis are shown in Table 13. The default

In order for the Two-Wire bus to operate at hysteresis is 10°C. When the ALERT/THERM2 pin is

frequencies above 400kHz, the master device must configured as a second thermal alarm (Configuration

issue a High-speed mode (Hs-mode) master code Register: bit 7 = x, bit 5 = 1), it functions the same as

(00001XXX) as the first byte after a START condition THERM, but uses the temperatures stored in the

to switch the bus to high-speed operation. The Local/Remote Temperature High Limit Registers to

TMP431/32 do not acknowledge this byte, but switch set its comparison range.

the input filters on SDA and SCL and the output filter

on SDA to operate in Hs-mode, allowing transfers at When ALERT/THERM2 is configured as ALERT

up to 3.4MHz. After the Hs-mode master code has (Configuration Register 1: bit 7 = 0, bit 5 = 0), the pin

been issued, the master transmits a Two-Wire slave asserts low when either the measured local or remote

address to initiate a data transfer operation. The bus temperature violates the range limit set by the

continues to operate in Hs-mode until a STOP corresponding Local/Remote Temperature High/Low

condition occurs on the bus. Upon receiving the Limit Registers. This alert function can be configured

STOP condition, the TMP431/32 switch the input and to assert only if the range is violated a specified

output filter back to fast-mode operation. number of consecutive times (1, 2, 3, or 4). The

consecutive violation limit is set in the Consecutive

Alert Register. False alerts that occur as a result of

Timeout Function environmental noise can be prevented by requiring

The serial interface of the TMP431/32 resets if either consecutive faults. ALERT also asserts low if the

SCL or SDA are held low for 32ms (typical) between remote temperature sensor is open-circuit. When the

a START and STOP condition. If the TMP431/32 are MASK function is enabled (Configuration Register 1:

holding the bus low, it releases the bus and waits for bit 7 = 1), ALERT is disabled (that is, masked).

a START condition. ALERT resets when the master reads the device

address, as long as the condition that caused the

THERM and ALERT/THERM2 alert no longer persists, and the Status Register has

been reset.

The TMP431/32 have two pins dedicated to alarm

functions, the THERM and ALERT/THERM2 pins. SMBus Alert Function

Both pins are open-drain outputs that each require a

pull-up resistor to V+. These pins can be wire-ORed The TMP431/32 support the SMBus Alert function.

together with other alarm pins for system monitoring When pin 6 (for the TMP431) or pin 8 (for the

of multiple sensors. The THERM pin provides a TMP432) is configured as an alert output, the ALERT

thermal interrupt that cannot be software disabled. pin of the TMP431/32 may be connected as an

The ALERT pin is intended for use as an earlier SMBus Alert signal. When a master detects an alert

warning interrupt, and can be software disabled, or condition on the ALERT line, the master sends an

masked. The ALERT/THERM2 pin can also be SMBus Alert command (00011001) on the bus. If the

configured for use as THERM2, a second THERM pin ALERT pin of the TMP431/32 is active, the devices

(Configuration Register 1: AL/TH bit = 1). The default acknowledge the SMBus Alert command and respond

setting configures pin 6 for the TMP431 and pin 8 for by returning the slave address on the SDA line. The

the TMP432 to function as ALERT (AL/TH = 0). eighth bit (LSB) of the slave address byte indicates

whether the temperature exceeding one of the

The THERM pin asserts low when either the temperature high limit settings or falling below one of

measured local or remote temperature is outside of the temperature low limit settings caused the alert

the temperature range programmed in the condition. This bit is high if the temperature is greater

corresponding Local/Remote THERM Limit Register. than or equal to one of the temperature high limit

The THERM temperature limit range can be settings; this bit is low if the temperature is less than

programmed with a wider range than that of the limit one of the temperature low limit settings. See

registers, which allows ALERT to provide an earlier Figure 21 for details of this sequence.

warning than THERM. The THERM alarm resets

automatically when the measured temperature

returns to within the THERM temperature limit range

minus the hysteresis value stored in the THERM

Product Folder Link(s): TMP431 TMP432

Measured

Temperature

THERMLimitandALERTHighLimit

ALERTLowLimitandTHERMLimitHysteresis

THERM

ALERT

SMBusALERT

Read Read

Time

Read

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Figure 21. SMBus Alert Timing Diagram

If multiple devices on the bus respond to the SMBus

Alert command, arbitration during the slave address Undervoltage Lockout

portion of the SMBus Alert command determines The TMP431/32 sense when the power-supply

which device clears its alert status. If the TMP431/32 voltage has reached a minimum voltage level for the

win the arbitration, the ALERT pin becomes inactive ADC to function. The detection circuitry consists of a

at the completion of the SMBus Alert command. If the voltage comparator that enables the ADC after the

TMP431/32 lose the arbitration, the ALERT pin power supply (V+) exceeds 2.45V (typical). The

remains active. comparator output is continuously checked during a

conversion. The TMP431/32 do not perform a

Shutdown Mode (SD) temperature conversion if the power supply is not

The TMP431/32 shutdown mode allows the user to valid. The last valid measured temperature is used for

save maximum power by shutting down all device the temperature measurement result.

circuitry other than the serial interface, reducing

current consumption to typically less than 3µA; see General Call Reset

typical characteristic curve Shutdown Quiescent The TMP431/32 support reset via the Two-Wire

Current vs Supply Voltage (Figure 6). Shutdown General Call address 00h (0000 0000b). The

mode is enabled when the SD bit of the Configuration TMP431/32 acknowledge the General Call address

immediately, aborting the current conversion. When 06h (0000 0110b), the TMP431/32 execute a

SD is low, the device maintains a continuous software reset. This software reset restores the

conversion state. power-on reset state to all TMP431/32 registers,

aborts any conversion in progress, and clears the

Sensor Fault ALERT and THERM pins. The TMP431/32 take no

The TMP431/32 can sense a fault at the DXP input action in response to other values in the second byte.

that results from an incorrect diode connection or an

open circuit. The detection circuitry consists of a Filtering

voltage comparator that trips when the voltage at Remote junction temperature sensors are usually

DXP exceeds (V+) –0.6V (typical). The comparator implemented in noisy environments. Noise is

output is continuously checked during a conversion. If frequently generated by fast digital signals and if not

a fault is detected, the last valid measured filtered properly can induce errors that corrupt

temperature is used for the temperature temperature measurements. The TMP431/32 have a

measurement result, the OPEN bit (Status Register, built-in 65kHz filter on the inputs of DXP and DXN to

bit 2) is set high, and, if the alert function is enabled, minimize the effects of noise. However, a differential

ALERT asserts low. low-pass filter can help attenuate unwanted coupled

When not using the remote sensor with the signals. Exact component values are

TMP431/32, the DXP and DXN inputs must be application-specific. It is also recommended that the

connected together to prevent meaningless fault capacitor value remains between 0pF to 2200pF with

warnings. a series resistance less than 1kΩ.

Product Folder Link(s): TMP431 TMP432

T =

ERR ´ °[273.15+T( C)]

h - 1.008

1.008

()

T =

ERR ´ °(273.15+100 C)

1.004 1.008

1.008

()

T =1.48 C

ERR °

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SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

Remote Sensing 3. Base resistance <100Ω.

4. Tight control of VBE characteristics indicated by

The TMP431/32 are designed to be used with either small variations in hFE (that is, 50 to 150).

discrete transistors or substrate transistors built into

processor chips and ASICs. Either NPN- or PNP-type Based on these criteria, two recommended

transistors can be used, as long as the base-emitter small-signal transistors are the 2N3904 (NPN) or

junction is used as the remote temperature sense. 2N3906 (PNP).

NPN transistors must be diode-connected. PNP

transistors can either be transistor- or diode- Measurement Accuracy and Thermal

connected (see Figure 13). Considerations

Errors in remote temperature sensor readings are The temperature measurement accuracy of the

typically the consequence of the ideality factor and TMP431/32 depends on the remote and/or local

current excitation used by the TMP431/32 versus the temperature sensor being at the same temperature

manufacturer-specified operating current for a given as the system point being monitored. Clearly, if the

transistor. Some manufacturers specify a high-level temperature sensor is not in good thermal contact

and low-level current for the temperature-sensing with the part of the system being monitored, then

substrate transistors. The TMP431/32 use 6μA for there will be a delay in the response of the sensor to

ILOW and 120μA for IHIGH. The TMP431/32 allow for a temperature change in the system. For remote

different η-factor values; see the η-Factor Correction temperature sensing applications that use a substrate

to the device being monitored, this delay is usually

The ideality factor (η) is a measured characteristic of not a concern.

a remote temperature sensor diode as compared to

an ideal diode. The ideality factor for the TMP431/32 The local temperature sensor inside the TMP431/32

is trimmed to be 1.008. For transistors whose ideality monitors the ambient air around the device. The

factor does not match the TMP431/32, Equation 6 thermal time constant for the TMP431/32 is

can be used to calculate the temperature error. Note approximately 2 seconds. This constant implies that if

that for the equation to be used correctly, actual the ambient air changes quickly by 100°C, it would

temperature (°C) must be converted to Kelvin (K). take the TMP431/32 about 10 seconds (that is, five

thermal time constants) to settle to within 1°C of the

final value. In most applications, the TMP431/32

package is in thermal contact with the printed circuit

Where: board (PCB), as well as subjected to forced airflow.

• η = Ideality factor of remote temperature sensor The accuracy of the measured temperature directly

depends on how accurately the PCB and forced

•T(°C) = actual temperature airflow temperatures represent the temperature that

•TERR = Error in TMP431/32 reading due to η ≠ the TMP431/32 is measuring. Additionally, the

1.008 internal power dissipation of the TMP431/32 can

•Degree delta is the same for °C and K (6) cause the temperature to rise above the ambient or

For n= 1.004 and T(°C) = 100°C: PCB temperature. The internal power dissipated as a

result of exciting the remote temperature sensor is

negligible because of the small currents used. For a

5.5V supply and maximum conversion rate of eight

conversions per second, the TMP431/32 dissipate

(7) 1.82mW (PDIQ = 5.5V ×330μA). If both the

ALERT/THERM2 and THERM pins are each sinking

If a discrete transistor is used as the remote 1mA, an additional 0.8mW is dissipated (PDOUT =

temperature sensor with the TMP431/32, the best 1mA ×0.4V + 1mA ×0.4V = 0.8mW). Total power

accuracy can be achieved by selecting the transistor dissipation is then 2.62mW (PDIQ + PDOUT) and, with

according to the following criteria: an θJA of 150°C/W, causes the junction temperature

1. Base-emitter voltage >0.25V at 6μA, at the to rise approximately 0.393°C above the ambient.

highest sensed temperature.

2. Base-emitter voltage <0.95V at 120μA, at the

lowest sensed temperature.

Product Folder Link(s): TMP431 TMP432

V+

DXP

DXN

GND

GroundorV+layer

onbottomand/or

top,ifpossible.

TMP431

0.1 FCapacitorm

PCBVia PCBVia

V+ GND

DXP

DXN

110

TMP432

0.1 FCapacitorm

PCBVia PCBVia

V+ GND

DXP1

DXP2

DXN1

DXN2

TMP431

TMP432

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

www.ti.com

Layout Considerations

Remote temperature sensing on the TMP431/32

measures very small voltages using very low

currents; therefore, noise at the IC inputs must be

minimized. Most applications using the TMP431/32

have high digital content, with several clocks and

logic level transitions creating a noisy environment.

Layout should conform to the following guidelines:

1. Place the TMP431/32 as close to the remote

junction sensor as possible.

2. Route the DXP and DXN traces next to each

other and shield them from adjacent signals

through the use of ground guard traces, as

shown in Figure 22. If a multilayer PCB is used,

bury these traces between ground or VDD planes

to shield them from extrinsic noise sources. 5 mil Note: Use 5 mil (.005 in, or 0,127 mm) traces

(0,127 mm) PCB traces are recommended. with 5 mil (.005 in, or 0,127 mm) spacing.

3. Minimize additional thermocouple junctions

caused by copper-to-solder connections. If these Figure 22. Example Signal Traces

junctions are used, make the same number and

approximate locations of copper-to-solder

connections in both the DXP and DXN

connections to cancel any thermocouple effects.

4. Use a 0.1μF local bypass capacitor directly

between the V+ and GND of the TMP431/32.

Figure 23 shows the suggested bypass capacitor

placement for the TMP431/32. This capacitance

includes any cable capacitance between the

remote temperature sensor and TMP431/32.

5. If the connection between the remote

temperature sensor and the TMP431/32 is less

than 8 inches (20,32 cm), use a twisted-wire pair

connection. Beyond 8 inches, use a twisted,

shielded pair with the shield grounded as close to

the TMP431/32 as possible. Leave the remote

sensor connection end of the shield wire open to

avoid ground loops and 60Hz pickup.

6. Thoroughly clean and remove all flux residue in

and around the pins of the TMP431/32 to avoid

temperature offset readings as a result of leakage

paths between DXP or DXN and GND, or

between DXP or DXN and V+.

Figure 23. Suggested Bypass Capacitor

Placement

Product Folder Link(s): TMP431 TMP432

TMP431

TMP432

www.ti.com

SBOS441C –SEPTEMBER 2009–REVISED FEBRUARY 2011

REVISION HISTORY

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision B (April, 2010) to Revision C Page

•Added Therm high limit column to Package Information table ............................................................................................. 2

•Added TMP431C, TMP431D device information .................................................................................................................. 2

•Added footnote (4) to TMP431 Register Map ..................................................................................................................... 13

•Revised information about power-on reset value of THERM limit registers in Limit Registers section .............................. 16

•Updated Serial Bus Address section for TMP431C/TMP431D device versions ................................................................ 25

•Revised Figure 17 ............................................................................................................................................................... 27

•Updated Figure 18 .............................................................................................................................................................. 27

•Changed Figure 19 ............................................................................................................................................................. 28

•Revised Figure 20 ............................................................................................................................................................... 28

Changes from Revision A (November, 2009) to Revision B Page

•Corrected Equation 7 .......................................................................................................................................................... 31

Product Folder Link(s): TMP431 TMP432

PACKAGE OPTION ADDENDUM

www.ti.com 16-Aug-2012

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status (1) Package Type Package

Drawing Pins Package Qty Eco Plan (2) Lead/

Ball Finish MSL Peak Temp (3) Samples

(Requires Login)

TMP431ADGKR ACTIVE VSSOP DGK 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

TMP431ADGKT ACTIVE VSSOP DGK 8 250 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

TMP431BDGKR ACTIVE VSSOP DGK 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

TMP431BDGKT ACTIVE VSSOP DGK 8 250 Green (RoHS

& no Sb/Br) CU NIPDAUAGLevel-2-260C-1 YEAR

TMP431CDGKR ACTIVE VSSOP DGK 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

TMP431CDGKT ACTIVE VSSOP DGK 8 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

TMP431DDGKR ACTIVE VSSOP DGK 8 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

TMP431DDGKT ACTIVE VSSOP DGK 8 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

TMP432ADGSR ACTIVE MSOP DGS 10 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

TMP432ADGST ACTIVE MSOP DGS 10 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

TMP432BDGSR ACTIVE MSOP DGS 10 2500 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

TMP432BDGST ACTIVE MSOP DGS 10 250 Green (RoHS

& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

PACKAGE OPTION ADDENDUM

www.ti.com 16-Aug-2012

Addendum-Page 2

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between

the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight

in homogeneous material)

(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

TMP431ADGKR VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP431ADGKT VSSOP DGK 8 250 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP431BDGKR VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP431BDGKT VSSOP DGK 8 250 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP431CDGKR VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP431CDGKT VSSOP DGK 8 250 177.8 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP431DDGKR VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP431DDGKT VSSOP DGK 8 250 177.8 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP432ADGSR MSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP432ADGST MSOP DGS 10 250 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP432BDGSR MSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

TMP432BDGST MSOP DGS 10 250 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

PACKAGE MATERIALS INFORMATION

www.ti.com 16-Aug-2012

Pack Materials-Page 1

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

TMP431ADGKR VSSOP DGK 8 2500 366.0 364.0 50.0

TMP431ADGKT VSSOP DGK 8 250 366.0 364.0 50.0

TMP431BDGKR VSSOP DGK 8 2500 366.0 364.0 50.0

TMP431BDGKT VSSOP DGK 8 250 366.0 364.0 50.0

TMP431CDGKR VSSOP DGK 8 2500 358.0 335.0 35.0

TMP431CDGKT VSSOP DGK 8 250 202.0 201.0 28.0

TMP431DDGKR VSSOP DGK 8 2500 358.0 335.0 35.0

TMP431DDGKT VSSOP DGK 8 250 202.0 201.0 28.0

TMP432ADGSR MSOP DGS 10 2500 358.0 335.0 35.0

TMP432ADGSR MSOP DGS 10 2500 366.0 364.0 50.0

TMP432ADGST MSOP DGS 10 250 366.0 364.0 50.0

TMP432ADGST MSOP DGS 10 250 358.0 335.0 35.0

TMP432BDGSR MSOP DGS 10 2500 358.0 335.0 35.0

TMP432BDGSR MSOP DGS 10 2500 366.0 364.0 50.0

TMP432BDGST MSOP DGS 10 250 358.0 335.0 35.0

TMP432BDGST MSOP DGS 10 250 366.0 364.0 50.0

PACKAGE MATERIALS INFORMATION

www.ti.com 16-Aug-2012

Pack Materials-Page 2

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