ADXL180 Datasheet, PDF (1/56 Pages) Analog Devices – Configurable, High g, iMEMS Accelerometer

FEATURES
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
Fully differential sensor and interface circuitry
High resistance to EMI/RFI
Sensor self-test
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
APPLICATIONS
Crash sensing
Configurable, High g,
iMEMS Accelerometer
ADXL180
GENERAL DESCRIPTION
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.
The sensor g range is configurable to provide full-scale ranges
from ±50 g to ±500 g. The sensor signal third-order, low-pass
Bessel filter bandwidth is configurable at 100 Hz, 200 Hz,
400 Hz, and 800 Hz.
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 +125°C and is available in a
5 mm × 5 mm LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
ADXL180
V_SCI
V/Q
OSCILLATOR/
TIMING
GENERATOR
OTP
FUSE
ROM
SERIAL
NUMBER
TRIMS
CONFIGURATION
DATA
MOD
DIFF
SENSOR
DEMOD
AMP
3-POLE
BESSEL
FILTER
10-
BIT
ADC
AUTO-
ZERO
V_CM
REF
V_CM
SELF-
TEST
V_SCO
Figure 1.
SERIAL
V_BP
PORT
COMM
INTERFACE
V_BC
V_BN
SYNC
DETECT
PROGRAM
INTERFACE
STATE
MACHINE
VOLTAGE
REGULATOR
V_DD
SUPPLY
MONITOR
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
©2008 Analog Devices, Inc. All rights reserved.