Configurable, High g,
iMEMS Accelerometer
ADXL180
FEATURES
GENERAL DESCRIPTION
Wide sensor range: 50 g to 500 g
Adjustable filter bandwidth: 100 Hz to 800 Hz
Configurable communication protocol
2-wire, current mode bus interface
Selectable sensor data resolution: 8 bit or 10 bit
Continuous auto-zero
The ADXL180 iMEMS® accelerometer is a configurable, single
axis, integrated satellite sensor that enables low cost solutions
for front and side impact airbag applications. Acceleration data
is sent to the control module via a digital 2-wire current loop
interface bus. The communication protocol is programmable for
compatibility with various automotive interface bus standards.
Fully differential sensor and interface circuitry
High resistance to EMI/RFI
Sensor self-test
The sensor g range is configurable to provide full-scale ranges
from ±±0 g to ±±00 g. The sensor signal third-order, low-pass
Bessel filter bandwidth is configurable at 100 Hz, 200 Hz,
400 Hz, and 800 Hz.
5.0 V to 14.5 V operation
8 bits of user-defined OTP memory
32-bit electronic serial number
Dual device per bus option
The 10-bit analog-to-digital converter (ADC) allows either 8-bit
or 10-bit acceleration data to be transmitted to the control module.
Each part has a unique electronic serial number. The device is
rated for operation from −40°C to +12±°C and is available in a
± mm × ± mm LFCSP package.
APPLICATIONS
Crash sensing
FUNCTIONAL BLOCK DIAGRAM
ADXL180
V
V
V
BP
BC
BN
SERIAL
PORT
SERIAL
NUMBER
COMM
INTERFACE
OSCILLATOR/
TIMING
GENERATOR
OTP
FUSE
ROM
TRIMS
V/Q
V
SCI
SYNC
DETECT
CONFIGURATION
DATA
PROGRAM
INTERFACE
3-POLE
BESSEL
FILTER
10-
BIT
ADC
DIFF
SENSOR
AUTO-
ZERO
DEMOD
AMP
MOD
VOLTAGE
REGULATOR
STATE
MACHINE
V
DD
SUPPLY
MONITOR
V
CM
REF
SELF-
TEST
V
V
SCO
CM
Figure 1.
Rev. A
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