Datasheet ADXL185B, ADXL189B (Analog Devices)

Low Cost, Single-Axis PSI5-Compatible Satel ite Sensor Data Sheet ADXL185B/ ADXL189B FEATURES GENERAL DESCRIPTION User configurable sensor range: ±30 g , ±60 g , ±120 g ,
The ADXL185B z-axis sensor and the ADXL189B x-axis sensor
±240 g , ±480 g
are g range configurable, integrated single-axis satellite sensors,
Compliant with PSI5 Communication Protocol Version 1.3
compliant with the PSI5 Version 1.3 specification. The ADXL185B/
Asynchronous operation: PSI5-A10P-250[228]/1L
ADXL189B enable low cost solutions for front and side impact
Synchronous operation: PSI5-P10P-500/3L and others
airbag satellite sensor applications. Acceleration data is sent to
Daisy-chain operation with bidirectional communication
the control module via a digital 2-wire current loop interface bus.
10-bit sensor data
The sensor g range is configurable to provide ful -scale ranges
0.25 µs data interpolation routine
from ±30 g to ±480 g. The devices can also be configured to
User-selectable, continuous auto-zero operation
transmit data from multiple g ranges during predefined time slots,
Electromechanical sensor self-test
in accordance with the PSI5 specification. The devices transmit
High resistance to EMI/RFI/BCI
10-bit acceleration data to the control module and can be configured
4.5 V to 16.5 V operation
to include either a 1-bit parity check or a 3-bit cyclic redundancy
Electronic serial number
check (CRC). Each device has a unique electronic serial number.
Qualified for automotive applications
The ADXL185B/ADXL189B are available in a 16-lead, narrow-body
APPLICATIONS
SOIC package with an exposed pad. The ADXL185B/ADXL189B
Front impact crash sensing
are specified to operate over the ful automotive temperature range
Side impact crash sensing
of −40°C to +125°C.
Shock and vibration detection Pedestrian collision sensing FUNCTIONAL BLOCK DIAGRAM SENSOR ANALOG DIGITAL SIGNAL PROCESSING COMMUNICATIONS INTERFACE MOSI FRONT END (SAFE) SPI MISO PHY SPI SCLK g RANGE DLL CS SERIAL PORT PSI5 DLL I PSI5 DATA OUTPUT PHY DIGITAL OFFSET/ VBP AC AUTO- DATA FILTER SENSITIVITY Σ-Δ MOD AMP DEMOD ZERO REGISTER –3dB AT CALIBRATION ~400Hz VDD V REG DD OFFSET OFFSET OVR X/Z SINGLE- OVER- ERROR FLAG V AXIS ACCEL BN RANGE OTP NVM SENSOR DIE SENSOR (SN, CAL, CONFIG) DRIVERS SELF- DCC TEST SELF- SELF-TEST POR TEST ERROR FLAG SHADOW RAM MASTER CHECK STATE MACHINE VDD MONITOR TEST REGISTERS V V REF REF TIMING TPA GENERATOR STATE MACHINE TEST MUX TPB ERROR HANDLER
001
CLOCK
12072- Figure 1. For more information about the ADXL185B/ADXL189B, please contact the Analog Devices, Inc., Customer Interaction Center at http://www.analog.com/en/content/technical_support_page/fca.html to connect with a technical support specialist.
Rev. Sp0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices f or 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2014 Analog Devices, Inc. A ll rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications General Description Functional Block Diagram