Triaxial, Digital Acceleration Sensor - LG GX500 Service Manual

3. TECHNICAL BRIEF
GX500 Operational Description

3.15 Triaxial, digital acceleration sensor

General description
The BMA020 is a tri-axial, low-g acceleration sensor IC with digital output for consumer market applications. It
allows measurements of acceleration in perpendicular axes as well as absolute temperature measurement.
An evaluation circuitry converts the output of a three-channel micromechanical acceleration sensing
structure that works according to the differential capacitance principle.
Package and interface have been defined to match a multitude of hardware requirements. Since the sensor IC
has small footprint and flat package it is attractive for mobile applications. The
sensor IC can be programmed to optimize functionality, performance and power consumption in customer
specific applications.
The BMA150 senses tilt, motion and shock vibration in cell phones, handhelds, computer peripherals,
man-machine interfaces, virtual reality features and game controllers.
The BMA150 is the LGA package version of the SMB380 triaxial acceleration sensor which is available in a
3mm x 3mm x 0.9mm QFN package.
Axes orientation of the BMA150
Figure 3-27 Axes orientation of the BMA150
ACCEL_INT
Figure 3- 28 Accel sensor circuit
LGE Internal Use Only
LG Electronics
ACCEL SENSOR
2V85_VFM
U203
1
NC1
2
VDD
3
GND
TP205
4
INT
5
CSB
C248
22n
- 64 -
64/143
2V62_VIO
BMA020
10
NC2
9
VDDIO
8
I2C2_SDA
SDI
7
SDO
6
I2C2_SCL
SCK
C249
0.1u
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