Low Cost, Single-Axis PSI5-Compatible Satellite 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 full-scale ranges 0.25 s 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 full automotive temperature range Side impact crash sensing of 40C to +125C. Shock and vibration detection Pedestrian collision sensing FUNCTIONAL BLOCK DIAGRAM SENSOR ANALOG DIGITAL SIGNAL PROCESSING COMMUNICATIONS INTERFACE MOSI FRONT END (SAFE) SPI MISO PHY SCLK SPI g RANGE DLL CS SERIAL PORT PSI5 I DATA DLL PSI5 OUTPUT PHY V DIGITAL OFFSET/ BP AUTO- DATA AC FILTER SENSITIVITY DEMOD - MOD ZERO REGISTER AMP 3dB AT CALIBRATION ~400Hz V DD V DD REG OFFSET OFFSET OVR X/Z SINGLE- OVER- ERROR FLAG V BN AXIS ACCEL RANGE OTP NVM SENSOR DIE SENSOR (SN, CAL, CONFIG) DCC DRIVERS SELF- TEST SELF- SELF-TEST POR TEST MASTER ERROR FLAG SHADOW RAM CHECK STATE MACHINE V MONITOR DD TEST REGISTERS V V REF REF TIMING TPA STATE MACHINE TEST MUX GENERATOR TPB ERROR HANDLER CLOCK Figure 1. For more information about the ADXL185B/ADXL189B, please contact the Analog Devices, Inc., Customer Interaction Center at ADXL185B/ADXL189B Data Sheet NOTES 2014 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D12072F-0-1/14(Sp0) Rev. Sp0 Page 2 of 2