LG LG-P970 - Compass Sensor

3. TECHNICAL BRIEF
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Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
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3.17 Compass Sensor
If a customer buy the application SW, The Sensor provides user with a Electric Compass function.
U105 (AK8975C, SUB-FPCB) IC is interfaced to OMAP3630(U301) using I2C interface.
Figure. Compass Sensor Schematic
Figure. Compass Sensor Block Diagram
U105
1C
3A
B1
D1
D4
3
C
4
C
2
C
D2
4A
1A
2A
B3
B4
SO
TST6
B
S
C
1
T
ST
V
S
R
CAD1
2
T
ST
D
I
V
YD
R
D
SDA/SI
CAD0
VDD
K
S
/
L
C
S
S
S
V
C117
0.1u
C119
0.1u
C116
0.1u
K
0
1
7
1
1
R
I2C3_SDA
L
CS_
3
C2I
1.8V_MOTION_VIO
1.8V_MOTION_VIO
3.0V_MOTION
3.0V_MOTION
TNI_MO
C
3-axis
Hall sensor
MUX
Chopper SW
Per- AMP
HE-Drive
Magnetic source
Voltage Reference
OSC1
Timing Control
Integrator & ADC
Interface,
Logic
& Register
FUSE ROM
POR
SCL/SK
SDA/SI
CSB
SO
DRDY
CAD0 CAD1 TST1 TST2 RSV TST6 VSS VDD VID