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Low Cost, Single-Axis PSI5-Compatible Satellite Sensor Data Sheet ADXL185B/ADXL189B Rev. Sp0 Document Feedback 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. Tel: 781.329.4700 ©2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com
FEATURES
User configurable sensor range: ±30 g, ±60 g, ±120 g, ±240 g, ±480 g Compliant with PSI5 Communication Protocol Version 1.3 Asynchronous operation: PSI5-A10P-250[228]/1L Synchronous operation: PSI5-P10P-500/3L and others Daisy-chain operation with bidirectional communication 10-bit sensor data 0.25 µs data interpolation routine User-selectable, continuous auto-zero operation Electromechanical sensor self-test High resistance to EMI/RFI/BCI 4.5 V to 16.5 V operation Electronic serial number Qualified for automotive applications
APPLICATIONS
Front impact crash sensing Side impact crash sensing Shock and vibration detection Pedestrian collision sensing GENERAL DESCRIPTION The ADXL185B z-axis sensor and the ADXL189B x-axis sensor are g range configurable, integrated single-axis satellite sensors, compliant with the PSI5 Version 1.3 specification. The ADXL185B/ ADXL189B enable low cost solutions for front and side impact airbag satellite sensor applications. Acceleration data is sent to the control module via a digital 2-wire current loop interface bus. The sensor g range is configurable to provide full-scale ranges from ±30 g to ±480 g. The devices can also be configured to transmit data from multiple g ranges during predefined time slots, in accordance with the PSI5 specification. The devices transmit 10-bit acceleration data to the control module and can be configured to include either a 1-bit parity check or a 3-bit cyclic redundancy check (CRC). Each device has a unique electronic serial number. The ADXL185B/ADXL189B are available in a 16-lead, narrow-body SOIC package with an exposed pad. The ADXL185B/ADXL189B are specified to operate over the full automotive temperature range of −40°C to +125°C. FUNCTIONAL BLOCK DIAGRAM X/Z SINGLE- AXIS ACCEL SENSOR DIE AC AMP DEMOD DIGITAL FILTER –3dB AT ~400Hz OFFSET/ SENSITIVITY CALIBRATION Σ-Δ MOD SELF- TEST SENSOR ANALOG FRONT END (SAFE) VREFVREF TIMING GENERATOR STATE MACHINE g RANGE OUTPUT DATA REGISTER OFFSET OVR ERROR FLAG SELF-TEST ERROR FLAG DIGITAL SIGNAL PROCESSING SENSOR DRIVERS COMMUNICATIONS INTERFACE SPI PHY PSI5 PHY POR VDD MONITOR TEST MUX CLOCK OTP NVM (SN, CAL, CONFIG) SHADOW RAM TEST REGISTERS ERROR HANDLER VDD REG MASTER STATE MACHINE SERIAL PORT SPI DLL PSI5 DLL MOSI MISO SCLK IDATA VBP VDD VBN DCC TPA TPB AUTO- ZERO OFFSET OVER- RANGE SELF- TEST CHECK CS 12072-001 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.
ADXL185B/ADXL189B Data Sheet Rev. Sp0 | Page 2 of 2 NOTES ©2014 Analog Devices, Inc. All rights reserved. Tra demarks and registered trademarks are the property of their respective owners.