GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
1
1 INTRODUCTION
GNS introduces a new series of complete GPS receivers that are optimized for very small battery
budgets.
Thanks to advanced dynamic power management technology, the power consumption is reduced to
a minimum below 7 mA (<20mW). Average power savings are 60%.
Unlike other concepts that use trickle operation modes with reduced update rates of the position,
GNS601uLP works at full 1 per second position update rate.
Best power savings can be achieved in typical outdoor scenarios with wide view angles to the sky.
GNS601uLP allows long term tracking in small applications like fitness wearables, pet tracking and
camera applications.
Very low power requirements and internal voltage regulator makes it easy to run the receiver with
various power supplies and allows direct connection to LiIon batteries.
GNS601uLP utilizes a patch antenna (15 by 15 mm) to realize high sensitivity and optimum
radiation pattern.
If space is a main requirement, GNS also offers a chip antenna version (GNS302uLP).
The navigation performance and accuracy is improved by using correction data from SBAS (WAAS,
EGNOS, GAGAN, MSAS), QZSS.
First Fixes after just a few seconds are achieved with the help of A-GPS using EPOTM (Extended
Prediction Orbit) and the EASYTM self generated orbit prediction algorithm. EASYTM (Embedded Assist
System) does not require any resources from the host and no data from the network.
AlwaysLocateTM power management feature can be activated to further lower the power
requirements at lower update rates. It adaptively adjusts power consumption depending on the
environment and motion conditions, in order to achive a balance between fix rate, power
consumption and position accuracy.
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
2
GNS601uLP offers the industry’s highest level of navigation sensitivity up to -165dBm1. It has
superior dynamic performance at high velocity and provides effective protection against
interference signals using MTAICTM (Multi-tone active interference canceller). Up to 12 independent
channel interference continious wave jammers <-80dBm can be eliminated or reduced.
The embedded logger function LOCUS with a 16-hrs (8000 samples) on chip memory makes this
GPS module a complete track logger for many applications.
In professional timing applications the outstanding high accuracy PPS (pulse per second) hardware
pin is used for synchronization to GPS second. Typical accuracy is 10ns RMS.
Features
Ultra low power technology at full tracking output rate
66 acquisition-/ 22 tracking channels
Ultra high tracking/navigation sensitivity: -165dBm1
tuned ceramic patch antenna
SBAS (WAAS,EGNOS,MSAS,GAGAN, QZSS) correction support
A-GPS by EPO “Extended Prediction Orbit” TM enables 7/14days prediction
12 Multitone Active Interference Canceller (MTAIC) for GPS-in-band jammer rejection
EASY TM : Self generated orbit prediction support
AlwaysLocate TM : Intelligent Algorithm for power saving
High accuracy 1PPS output
NMEA-0183 or binary protocol
High update rate (up to 10/s)
Embedded logger function with 16hrs internal memory
GPS current consumption (@3.3V):
Acquisition: 20mA typical
Tracking: 6mA typical
Low backup current consumption 7uA, typical
SMD type , manual soldering also possible
Small form factor: 16x16x6.7mm
CE and RohS certified
1 Note: Measured navigation sensitivity at RF input of chipset
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
3
2 INDEX
1 INTRODUCTION ----------------------------------------------------------------------------------------- 1
2 INDEX --------------------------------------------------------------------------------------------------- 3
3 FUNCTIONAL DESCRIPTION ---------------------------------------------------------------------------- 4
3.1 System description --------------------------------------------------------------------------------------------------------- 4
3.2 Block diagram -------------------------------------------------------------------------------------------------------------- 4
3.3 AGPS with EPO data -------------------------------------------------------------------------------------------------------- 5
3.4 Power Management Features ---------------------------------------------------------------------------------------------- 6
3.5 EASYTM self generated prediction data feature ---------------------------------------------------------------------------- 8
3.6 Pulse Per Second (PPS) ---------------------------------------------------------------------------------------------------- 8
3.7 Logger function ------------------------------------------------------------------------------------------------------------- 9
3.8 Active interference cancellation (MTAIC) --------------------------------------------------------------------------------- 9
3.9 SBAS (Satellite Based Augmentation) support --------------------------------------------------------------------------- 9
3.10 GPS almanac and ephemeris data--------------------------------------------------------------------------------------- 10
3.11 Real time clock (RTC) ---------------------------------------------------------------------------------------------------- 10
3.12 UART interface ------------------------------------------------------------------------------------------------------------ 10
3.13 Module default settings -------------------------------------------------------------------------------------------------- 11
4 TYPICAL APPLICATION BLOCK DIAGRAM ------------------------------------------------------------ 11
4.1 Typical System Overview ------------------------------------------------------------------------------------------------ 11
5 GPS characteristics ----------------------------------------------------------------------------------- 12
5.1 GPS characteristics ------------------------------------------------------------------------------------------------------- 12
6 DESIGN GUIDELINES --------------------------------------------------------------------------------- 13
6.1 PCB LAYOUT GUIDELINES ----------------------------------------------------------------------------------------------- 13
7 ELECTRICAL SPECIFICATION ------------------------------------------------------------------------- 14
7.1 Absolute Maximum Ratings ---------------------------------------------------------------------------------------------- 14
7.2 Recommended Operating Conditions ----------------------------------------------------------------------------------- 14
8 PIN CONFIGURATION --------------------------------------------------------------------------------- 15
9 PHYSICAL DIMENSIONS ------------------------------------------------------------------------------ 16
10 RECOMMENDED PAD LAYOUT ----------------------------------------------------------------------- 17
11 NMEA DATA interface -------------------------------------------------------------------------------- 18
11.1 NMEA output sentences -------------------------------------------------------------------------------------------------- 18
11.2 NMEA command interface------------------------------------------------------------------------------------------------ 18
12 MATERIAL INFORMATION --------------------------------------------------------------------------- 19
13 RECOMMENDED SOLDERING REFLOW PROFILE --------------------------------------------------- 19
14 TAPE&REEL INFORMATION -------------------------------------------------------------------------- 20
15 ORDERING INFORMATION -------------------------------------------------------------------------- 21
16 ENVIRONMENTAL INFORMATION ------------------------------------------------------------------- 22
17 MOISTURE SENSITIVITY ---------------------------------------------------------------------------- 22
18 DOCUMENT REVISION HISTORY -------------------------------------------------------------------- 22
19 RELATED DOCUMENTS ------------------------------------------------------------------------------ 22
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
4
3 FUNCTIONAL DESCRIPTION
3.1 System description
The GNS601uLP is a high performance, low power GPS receiver that includes an integrated RF
frontend (SAW Filter + LNA) and a finely tuned 15x15x4mm ceramic patch antenna.
Due to high input sensitivity and integrated low noise amplifier (LNA), it can work at very weak GPS
signals.
GNS601uLP is a complete autonomous GPS receiver, including:
- Full GPS processing, without any host processing requirements
- Standard NMEA message output
- A powerful NMEA command and control interface
- All clock sources integrated
- RF frontend integrates a low noise amplifier (LNA) and a SAW filter
- Interface for UART, PPS output pin, Fix Status Indicator pin
3.2 Block diagram
GPS chip
32.768kHz
crystal
26MHz
TCXO
SAW filter
+Low Noise
Amplifier
GND
3,8,11,12,13
Resistor
4
1
VCC
VBACKUP
5
3D-Fix
6
1PPS
9
UART TX
10
UART RX
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
5
3.3 AGPS with EPO data
AGPS (assisted GPS) allows to shorten TTFF (TimeToFirstFix) by injecting ephemeris data from an
external source into the module’s memory. With the help of these data, the module does not need
to acquire satellite positions by receiving the data from the satellites.
Depending on time and position information, that is still available in the module memory, the TTFF
can be reduced to just a few seconds.
The GNS AGPS service is based on a short term predicted data service. The predicted data will be
fully processed by the GPS engine. The host must load the data from the web and transfer them
over the UART into the module:
1. Check GNS601uLP module EPO (Extended Prediction Orbit) data for validity by comparing
the time.
2. Connect to web server through network connection (GPRS, WLAN, LAN,..).
3. Download file. There are just two files, covering all GPS satellites. The first file (MTK7d.EPO)
is for 7 days (53kB), the other is 106Kbytes for 14 days (MTK14d.EPO)
4. “Parse” file, using software example. This is quite easy, there must be added some header
bytes and a checksum and a control counter. GNS offers software support on this.
5. Download to GNS601uLP receiver. Please refer to the NMEAcommandInterface manual for
details.
If the host has low memory available, there’s no need to save the whole file. The steps 3..5 can be
done frame by frame needing less than 2kBytes of buffer memory.
Code samples and support for several platforms are available from GNS (in preparation).
Thanks to the predicted system, download data stay valid for up to 14 days. Therefore, users can
initiate the download everytime and benefit from using (W)LAN instead of using expensive GSM.
File size will be ~50kBytes for a one week prediction data set.
AGPS characteristics
System
predicted data
File size for data download
53
kB
1 week prediction data
Maximum prediction time
7
14
days
TTFF
1
sec
Time and last position available
TTFF
15
sec
Last position available
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
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3.4 Power Management Features
GNS601uLP uses an advanced hardware / firmware architecture to minimize power consumption at
full navigation update rate of 1position per second.
Best savings are possible with 6 SVs in track and good fieldstrength.
uLP feature is a dynamic power management that allows to reduce the power consumption
to ~40% in average. Thanks to advanced hardware and firmware architecture and unlike
other power management features, uLP feature will calculate and output position data every
second. uLP feature has been developed for fitness- and other wearable applications. The
average accuracy will be slightly reduced (4m instead of 3m). For static or slow moving
scenarios , the savings can be better than 70%. uLP feature is activated by default and can
be deactivated through $PMTK262,0 command.
Besides of the uLP power mode, the well known power savings modes with reduced output rate and
performance are available when uLP is disabled.
Power management schemes implemented for any GPS system requires an optimally tuned
performance for both accuracy of the position fixes and the average power consumed for best user
experience. GNS601uLP architecture achieves these both aspects by providing flexibility and
design choices for the system integration, based on wide range of use cases and by leveraging on
the proven silicon methodologies. Also GNS601uLP provides position, velocity and time
measurements without any host loading. This, coupled with the optional built-in power
management options, reduces the overall system power budget.
Selectable Power management features:
LP feature is a dynamic power management that allows to reduce the power consumption
to ~40% in average. Unlike other power management features, LP feature will calculate and
output position data every second. LP feature has been developed for fitness- and other
wearable applications. The average accuracy will be slightly reduced (4m instead of 3m). For
static or slow moving scenarios , the savings can be better than 70%. LP feature is activated
by default and can be deactivated by $PMTK262,0 command.
In Standby mode RF frontend and internal MPU are switched to deep sleep state. Power
consumption is reduced.This state can be entered by sending the NMEA command:
$PMTK161,0*28<CR><LF>.
Leaving standby mode and resuming to normal operation will be managed by sending any
byte to the module.
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
7
Backup mode can be entered by sending NMEA command: $PMTK225,4*2F<CR><LF>.
The GPS core will shut down autonomously to backup state, Vcc supply can now be switched
off by an external power supply switch.
Periodic mode describes a power mode, which will autonomously power on/off the module
in programmable time slots with reduced fix rate. Periodic mode is useful during stationary
operation or if position fixes are just needed from time to time. Since power consumption in
GPS off times is nearly zero, the power consumption in periodic mode can be estimated by
Ptracking * (ton/(ton+toff)).
Periodic mode is controlled with NMEA command $PTMK225. See document
NMEAcommandInterface manual for programming details.
AlwaysLocateTM feature provides an optimized overall GPS system power consumption in
tracking mode under open sky conditions. Always Locate is an intelligent control of periodic
mode. Depending on the environment and motion conditions, GNS601uLP can adjust the
on/off time to achieve balance of positioning accuracy and power consumption. The best
power saving will be made under good reception in stationary mode. Critical reception
conditions and dynamic movements will need full activity of the GPS engine which causes
nominal power requirements (20mA typ in tracking mode).
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
8
3.5 EASYTM self generated prediction data feature
GNS601uLP includes an internal prediction system, that allows to sample satellite orbit data during
operation and use that data to speed up TTFF on later starts.The prediction time frame is up to
three days forward.
Although this prediction feature does not provide the very short TTFF that is achieved using AGPS,
it can help to find a fix solution faster and in weak signal condition scenario. Prediction data will be
kept in memory as long as VBACKUP is present. This option is activated by default.
Note: The EASY functionality is only supported, if “VBACKUP” pin is conntected and the NMEA
update rate is 1Hz.
3.6 Pulse Per Second (PPS)
GNS601uLP provides a Pulse Per Second (PPS) hardware output pin for timing purposes. After
calculation of a 3D position fix (default setting), the PPS signal is accurately aligned to the GPS
second boundaries. The pulse generated is approximately 100 milliseconds in duration and the
repetition rate is 1 second. On request PPS output can activated on a 2D- fix or after power-up of
the module, providing a time accuracy decreased PPS signal.
GNS601uLP module provides an exceptionally low RMS jitter of typical 10 nanoseconds.
T1
T2
T1 = 100ms
T2 = 1sec
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
9
PPS characteristics based upon a 3D-fix
1PPS pulse duration
-
100
-
msec
1PPS time jitter
-
10
nsec
RMS
Pulse rising edge deviation from
expected pulse time, measured
with full 3D fix
1PPS rise and fall time
5
nsec
10%..90%, load is 10k||5pF
3.7 Logger function
GNS601uLP provides an autonomous logger function that automatically stores position information
in an internal 128kB flash memory. A complete tracking unit can be realized without any external
CPU or memory.
The parameters for logging are programmable via the NMEA command interface. The following
parameter can be set to optimize logging time:
- logger rate
The commands for logger include:
- start logging
- stop logging
- erase memory
- readout memory
please refer to the NMEAcommandInterface manual for details.
3.8 Active interference cancellation (MTAIC)
Because different wireless technologies like Wi-Fi, GSM/GPRS, 3G/4G, Bluetooth are integrated into
portable systems, the harmonic of RF signals may influence the GPS reception.
The multi-tone active interference canceller can reject external RF interference which come from
other active components on the main board, thus improving the performance of GPS reception.
GNS601uLP can cancel up to 12 independent continuous wave (CW) channels having signal levels
of up to -80dBm. The functionality is enabled by default and increases power consumption by about
1mA.
3.9 SBAS (Satellite Based Augmentation) support
GNS601uLP supports Satellite Based Augmentation for improvement of the navigation precision.
Correction data is sent from geostationary satellites to the GPS receiver. GNS601uLP supports
European, US, and Asian augmentation systems (EGNOS, WAAS, GAGAN, MSAS, QZSS) to enable
precision improvements in nearly every region of the world.
SBAS is active by default and will automatically track the available SBAS satellites. It can be
disabled by NMEA command. See document NMEAcommandInterface manual for details.
Note: SBAS is deactivated in uLP mode. For SBAS activation, uLP mode must be disabled
Internal Logger Function
Logger data rate
1/15
1
1/s
Logger data memory
128
kBytes
Flash memory
Logger trigger
programm
able
Logger can be triggered on
various events
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
10
3.10 GPS almanac and ephemeris data
For quick re-acquisition of the GPS after off-times, the GPS engine should have access to almanac
and ephemeris data. This data is permanently stored inside GNS601uLP module, even if all power
supplies have been removed. When the GPS is powered-up again, the data will be used to allow a
quick re-acquisition, as soon as a coarse time information is available. Time will be available
immediately, when RTC is kept running.
3.11 Real time clock (RTC)
GNS601uLP has a real time clock with 32,768Hz crystal onboard. As long as VBACKUP is connected to
a power source, the real time clock and the module memory can be kept alive at very low power
consumption of just 7uA. The RTC will track the current time and enable the module to start from
sleep states with very fast time to first Fix (TTFF).
3.12 UART interface
GNS601uLP core and I/O sections work at 3.3V nominal. Absolute Maximum Ratings should not be
exceeded. Should the GNS601uLP be interfaced to a host with I/O at higher/lower levels, level
shifters should be used. UART baud rate is 9600 baud by default. The baud rate can be modified to
higher rates by a NMEA software command. See document NMEAcommandInterface manual for
details.
GPS UART Default Settings
Parameter
Value
Baud rate
9600
Data length
8 bits
Stop bit
1
Parity
None
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
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3.13 Module default settings
The GNS601ULP receiver comes with default settings, which are persistently programmed.
Whenever power is removed from the module (both VCC and VBACKUP), the settings will be reset to
the values shown in the following table.
NMEA output sentences
Setting
Default value
UART setting
9600,8,N,1
Fix frequency (update rate)
1/sec
NMEA sentences
$GPRMC,$GPGSA,$GPGSV,$GPGGA
NMEA rate
Once a second
Self survey prediction mode:
EASYTM
enabled
Active interference
cancellation:MTAIC
enabled
Datum
WGS 84
Logging parameters
Full&Stop / Content Basic / Interval 15 sec
Low Power Feature
Activated (disabled on request)
On request, other options can be selected as preprogrammed (persistent default) options.
Please contact the GNS support for your project requirements.
Note : Customized options are solely available for fixed order lots.
4 TYPICAL APPLICATION BLOCK DIAGRAM
4.1 Typical System Overview
Host Processor
MMI
(keys, display)
Power
Management
2.8 to 4.3V
GNS 601uLP
UART RX
UART TX
VCC
V Backup
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
12
5 GPS characteristics
5.1 GPS characteristics
Parameter
Min
Typ
Max
Unit
Note
general
Frequency
1575.42
MHz
GPS L1 C/A code
SBAS
WAAS,EGNOS,MSAS,GAGAN,QZSS
Not available in uLP mode
Datum
WGS84
AGPS
7
14
days
Configurable
Output data frequency
1/10
1
10
1/sec
Navigation&tracking sensitivity1
-165
dBm
autonomous
Acquisition sensitivity1
-148
dBm
Cold start
Reacquisition sensitivity1
-163
dBm
Hot start
TTFF hotstart
1
sec
6 SVs @-130dBm
TTFF autonomous warm start
34
sec
6 SVs @-130dBm
TTFF autonomous warm start
5..10
sec
6 SVs @-130dBm / with EASY on
TTFF autonomous cold start
35
sec
6 SVs @-130dBm
Reacquisition time
<1
sec
6 SVs @-130dBm
Number of channels tracking
22
Number of acquisition channels
66
Dimension
16x16x6.7
mm
Tolerance is 0.2 mm
Weight
6
g
Power consumption
35*
mA
NMEA frequency = 1/sec*
GPS ACTIVE (acquisition)
21
mA
NMEA frequency = 1/sec, 3.3V;
SBAS enabled;MTIAC enabled
GPS ACTIVE (tracking)
20
mA
NMEA frequency = 1/sec, 3.3V;
SBAS enabled;MTIAC enabled
GPS ACTIVE (tracking in uLP
mode)
6
mA
uLP mode activated, 6 SVs in
solution
Backup current @ 3V
7
uA
Accuracy
Position error (50%CEP)
-
4
-
m
2D-RMS
Position error (50%CEP)
-
2.5
-
m
Using (SBAS) , uLP mode disabled
Velocity error
-
0.1
-
m/s
velocity error
-
0.05
-
m/s
Using (SBAS) , uLP mode disabled
ITAR limits
Operation altitude
-
18,000
m
Operation velocity
-
-
515
m/s
Operation acceleration
-
-
4
G
1 note: based on chip specifications
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
13
6 DESIGN GUIDELINES
Although GNS601uLP GPS receiver provides best performance at low power consumption, special
care should be taken to provide clean signal and clean power supplies. Power lines should be
blocked near to the receiver with low ESR capacitors.
Radiated noise from neighbour components may also reduce the performance of the receiver.
Plastic enclosures can have impact on the antenna center frequency. Avoid that the antenna is in
touch with any enclosure parts. A space of ~2mm should be kept clear between antenna and
enclosure.
Product testing should be performed with the PCB already mounted in the final enclosure.
6.1 PCB LAYOUT GUIDELINES
GNS601uLP uses a high performance chip antenna design.
For optimum performance, a ground plane area is needed on the main board. This area should be
at least 20 x 20mm, a larger ground is recommended.
The ground plane can be part of the main
ground layer of the mainboard, some (small)
components in the neighbourhood are
acceptable. Do not place any bulky or metallic
components near the antenna (in a distance
below 30mm) to avoid unwanted
electromagnetic shielding effects.
It’s recommended to place GNS601uLP near
the rim of the main PCB, so that the antenna
has a wide unobstructed working angle.
The marked clearance area around the
antenna pin must be kept clear! It is
recommended to place a 3mm hole to ensure
proper mechanical flat placement of the
module. See chapter 10 for hole location.
If possible, do not place any signal tracks
below the module.
Place multiple vias from Top-GND layer to
bottom (or other) GND layer(s) as shown in the example.
All ground pads of the module should be releliably soldered.
General rules for good and low noise design should be followed:
Use a solid ground plane.
Keep noisy components (µC, switch mode supplies) as far as possible away from sensitive
antenna inputs
Place decoupling capacitors near to the source of noise and provide a short and low
induction connection to ground (use multi-vias if needed)
EMC filters or noise filtering coils or beads can help to reduce the noise level further.
Select system clocks in a way, that no harmonics will match the GPS frequency of 1575.42
MHz
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GNS601uLP
Datasheet
preliminary specification
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7 ELECTRICAL SPECIFICATION
7.1 Absolute Maximum Ratings
Parameter
Value
Unit
Supply voltage range: Vcc
2.8 to 4.3
V
Backup voltage: VBACKUP
2 to 4.3
V
7.2 Recommended Operating Conditions
Parameter
Min
Typ
Max
Unit
Note
Vcc
3.2
3.3
4.2
V
supply voltage
Vcc ripple voltage
50
mVpp
VBACKUP
2.2
3.0
4.2
V
Backup voltage for RTC and
memory retention, must be
available during normal
operation
RX0 TTL H Level
2.0
Vcc
V
Condition: VCC=3.0V~4.3V
RX0 TTL L Level
0
0.8
V
Condition: VCC=3.0V~4.3V
TX0 TTL H Level
2.4
2.8
V
Condition: VCC=3.0V~4.3V
TX0 TTL L Level
0
0.4
V
Condition: VCC=3.0V~4.3V
Storage temperature
-50
90
°C
Operating temperature
-40
85
°C
GPS low power receiver
GNS601uLP
Datasheet
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8 PIN CONFIGURATION
Pin
Name
I/O
Description & Note
1
VCC
P
Main DC power input
The main DC power supply for the module. The voltage should be kept between from 3.2V to 5.0V. The ripple
must be limited under 50mVpp (Typical: 3.3V).
2
NC
Not connected
3
GND
P
Ground .
4
VBACKUP
P
Backup power input for RTC & navigation data keep
This connects to the backup power of the GPS module. Power source (such as battery) connected to this pin will
help the GPS chipset in keeping its internal RTC running when the main power source is turned off. The voltage
should be kept between 2.0V~4.3V, Typical 3.0V.
If VBACKUP power was not reserved, the GPS module will perform a lengthy cold start every time it is powered-
on because previous satellite information is not retained and needs to be re-transmitted.
This pin must be connected for normal operation.
5
3D_FIX
O
3D-Fix Indicator
The 3D_FIX is assigned as a fix flag output. If not used, keep floating.
Before 2D Fix
The pin will continuously toggle with 1Hz. output one second high-level and one-second low-level signal
After 2D or 3D Fix
The pin will continuously output low-level signal.
This pin may not connected to high-level at power-on sequence.
6
1PPS
O
1PPS Time Mark Output 2.8V CMOS Level
This pin provides one pulse-per-second output from the module and synchronizes to GPS time. Keep floating if
not used.
7
NC
Not connected
8
GND
P
Ground .
9
TX
O
Serial Data Output A for NMEA output (TTL)
This is the UART transmitter of the module. It outputs GPS information for application.
10
RX
I
Serial Data Input A for Firmware update (TTL)
This is the UART receiver of the module. It is used to receive commands from system.
11
GND
P
Ground .
12
GND
P
Ground .
13
GND
P
Ground .
(1) I = INPUT; O = OUTPUT; I/O = BIDIRECTIONAL; P = POWER PIN; ANA = ANALOG PIN.
Top View
GPS low power receiver
GNS601uLP
Datasheet
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16
9 PHYSICAL DIMENSIONS
TOP VIEW
all units in mm, tolerance is ±0.2mm
GPS low power receiver
GNS601uLP
Datasheet
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17
10 RECOMMENDED PAD LAYOUT
all units in mm
Footprint Top View
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GNS601uLP
Datasheet
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11 NMEA DATA interface
GNS601uLP provides NMEA (National Marine Electronics Association) 0183 compatible data.
A set of proprietary NMEA commands are available to send control messages to the receiver.
These commands are described in a separate document: NMEAcommandInterface manual.
For standard operation, no commands are needed; the module will start outputting NMEA sentences
after power supply has been attached
If non standard options are needed they can be programmed from host controller during runtime.
Important note : Options set by using NMEA command interface are not persistent! They will be
lost when power is removed. A backup supply at VBACKUP will be sufficient to keep them.
11.1 NMEA output sentences
NMEA output sentences
Type
content
Common GPS sentences
$GPRMC
Recommended Minimum Navigation Information
$GPGGA
Fix Data, Time, Position and fix related data for a GPS receiver
$GPGSA
DOP and active satellites
$GPGLL
Geographic Position - Latitude/Longitude
$GPGSV
GPS Satellites in view
11.2 NMEA command interface
GNS601uLP NMEA command interface allows to control settings and the extended functions. The
command interface specification is available in an extra document: NMEAcommandInterface
manual.
Two groups of commands are available:
Setting commands do modify the behavior of the module.
Note : Modified settings will be valid as long as the module is powered through VCC or VBACKUP.
(f.e. : setting of a new baud rate). After removing VCC and VBACKUP, all settings are reset to their
default values.
Action commands will perform the specified action one time after the command has been received.
(f.e. : request for cold start)
Commands are always started with $PTMK, directly followed by the command number 000..999.
Each command must be terminated by *<chksum>and a <CR><LF>.
The checksum calculation is simple, just XOR all the bytes between the $ and the * (not including
the delimiters themselves). Then use the hexadecimal ASCII format.
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
19
12 MATERIAL INFORMATION
Complies to ROHS standard
ROHS documentations are available on request
Contact surface: gold over nickel
13 RECOMMENDED SOLDERING REFLOW PROFILE
Notes:
1. GNS601uLP should be soldered in upright soldering position. In case of head-over soldering, please prevent
shielding / GNS601uLP receiver from falling down.
2. Do never exceed maximum peak temperature
3. Reflow cycles allowed : 1 time
5. This device is not applicable for flow solder processing
6. This device is applicable for solder iron process. Use solder iron at or below 350°C, soldering time < 3 sec,
pause between two solder points 3 sec.
100
200
300
t[sec]
100
200
T[°C]
250°C max
250°C for 10 sec max
230°C for 40 sec max
160°C 190°C 120 sec
reflow solder
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
20
14 TAPE&REEL INFORMATION
Tape information:
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
21
Reel information:
H= 32.5mm
Number of devices: 250pcs/reel
15 ORDERING INFORMATION
Ordering information
Type
Part#
marking
Description
GNS601uLP
4037735105386
GNS601uLP
GPS low power receiver
GNS601uLP
Datasheet
preliminary specification
V 1.3, Feb 17th 2016
22
16 ENVIRONMENTAL INFORMATION
This product is free of environmental hazardous substances and complies with 2002/95/EC. (RoHS
directive).
17 MOISTURE SENSITIVITY
This device must be prebaked before being put to reflow solder process.
Disregarding may cause destructive effects like chip cracking, which leaves the device defective !
Shelf life
6 months , sealed
Possible prebake recommendations
12 hrs @ 60°C
Floor life (time from prebake to solder process)
<72 hrs
18 DOCUMENT REVISION HISTORY
V1.0
Jun 30 2015
P.Skaliks
initial document, preliminary
V1.3
Feb 17 2016
O.Diegel/
P.Skaliks
Corrected Part#, general review, baud rate, PCB design hints,
pictures
19 RELATED DOCUMENTS
Title
Description / file
Available from
NMEA_Interface_manual_MTK_Vx
Detailed description of NMEA interface
www.gns-gmbh.com
GNS601uLP StarterKit user
manual
User manual for the GNS601uLP
receiver based evaluation kit
www.gns-gmbh.com
GNS GMBH 2016
THE INFORMATION IN THIS DOCUMENTATION DOES NOT FORM ANY QUOTATION OR CONTRACT. TECHNICAL DATA ARE DUE TO BE CHANGED WITHOUT
NOTICE.
NO LIABILITY WILL BE ACCEPTED BY THE PUBLISHER FOR ANY CONSEQUENCE OF THIS DOCUMENT'S USE.
REPRODUCTION IN WHOLE OR IN PART IS PROHIBITED WITHOUT THE PRIOR WRITTEN CONSENT OF THE COPYRIGHT OWNER