PRODUCT BRIEF
Never stop thinking.
Applications
■Angular and linear position sensing
in automotive and industrial appli-
cations:
- Pedal position
- Suspension control
- Valve position
- Throttle position
- Steering angle
- Seat position
- Rotary switch (white goods)
Features
■Intrinisic angle sensor
■Sensitive to direction of an applied
magnetic field not to its intensity
■Huge assembly tolerances
■Big airgaps
■Monolithic bridge structures
■Constant temperature coefficient
■Small SMT package
GMR B6/GMR C6
Giant Magneto Resistor (GMR)
Giant Magneto Resistor-
the optimized angle
sensor
P-MW-6
PRODUCT BRIEF
How to reach us:
http://www.infineon.com
Infineon Technologies AG
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Infineon Technologies Corp.
Suite 112, Sensors Marketing Group
21800 Haggerty Rd.
NORTHVILLE, (MI) 48167
Tel. (+1) 2 48-3 74 08 90
Fax (+1) 2 48-3 74 25 01
Published by
Infineon Technologies AG,
St.-Martin-Strasse 53,
81541 München
© Infineon Technologies AG 2001. All Rights Reserved.
Attention please!
The information herein is given to describe certain components
and shall not be considered as warranted characteristics.
Terms of delivery and rights to technical change reserved.
We hereby disclaim any and all warranties, including but
not limited to warranties of non-infringement, regarding cir-
cuits, descriptions and charts stated herein.
Infineon Technologies is an approved CECC manufacturer.
Information
For further information on technology, delivery terms
and conditions and prices please contact your nearest
Infineon Technologies Office in Germany or our
Infineon Technologies Representatives worldwide.
Warnings
Due to technical requirements components may contain danger-
ous substances. For information on the types in question please
contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-
support devices or systems with the express written approval
of Infineon Technologies, if a failure of such components can
reasonably be expected to cause the failure of that life-support
device or system, or to affect the safety or effectiveness of that
device or system. Life support devices or systems are intended
to be implanted in the human body, or to support and/or main-
tain and sustain and/or protect human life. If they fail, it is rea-
sonable to assume that the health of the user or other persons
may be endangered.
Published by Infineon Technologies AG
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+
+
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ADC 1
R
R
ADC 2
µC
V
0
/2 (1+∆R/R sin(α))
V
0
/2 (1+∆R/R cos(α))
Supply V
0
GMR C6
V
A
× sin(α)
V
A
× cos(α)
Amplifier
(A ≈ 50)
µC evaluation:
1. Division eliminates temperature
dependence of amplitude
2. Arcus tangent evaluation by look
up table or computation ⇒ angle α
V
A
× sin(α)
V
A
× cos(α)= tan(α) ⇒ α
N
S
GMR B6
sine sine cosine
GMR C6
Bridge Voltage
>200 mV @5 V
-1
GMR C6 sine
0
1
0˚ 180˚ 360˚
Angle
GMR C6 cosine
GMR B6 sine × 2
GMR C6: bridge voltage against half suply voltage
M
Ordering No. B112-H7829-X-X-7600
Printed in Germany
PS 03012. NB
■Two types of monolithic bridges
–formed by 4 resistive areas with
different orientation
■GMR B6 - Wheatstone full bridge
for 180° angular range
■GMR C6 - two crossed half bridges
for 360° angular range
Parameter Symbol
Supply voltage V
1
Basic resistance R
0
Magnetic window H
GMR effect ∆R/R
0
Output signal full bridge (@V
1N
= 5 V) V
out
Output signal half bridge (@V
1N
= 5 V) V
out
Offset voltage (@V
1N
= 5 V) |V
0
|
Operating temperature T
A
Value
0 ... 7
>700
5 ... 15
>4
>200
>100
<8
-40 ... 150
Unit
V
Ω
kA/m
%
mV
mV
mV
˚C
Type Sales Code Package
GMR B6 Q62705-K 5004 P-MW-6
GMR C6 Q62705-K 5005 P-MW-6
