Datasheet ADXL151 (Analog Devices)

Low Cost, Single Axis, PSI5-Compatible Satel ite Sensor Data Sheet ADXL151 FEATURES GENERAL DESCRIPTION User configurable sensor range
The ADXL151 is a g range configurable single axis integrated
±120 g , ±240 g , and ±480 g
satellite sensor, compliant to the PSI5 V2.1 specification. The
PSI5 communication protocol, V2.1 compliant
ADXL151 enables low cost solutions for front and side impact
Asynchronous operation—PSI5-A10P-250[228]/1L
airbag satellite sensor applications. Acceleration data is sent to
Synchronous operation—PSI5-P10P-500/3L and others
the control module via a digital 2-wire current loop interface bus.
Daisy-chain operation with bidirectional communication
The g range of the sensor is configurable to provide full-scale
Backwards compliant with PSI5 V1.3
acceleration measurements of ±120 g, ±240 g, or ±480 g.
Selectable 10- or 16-bit sensor data
Additionally, the device can be configured to transmit data
High accuracy interpolation routine
from multiple g ranges during predefined time slots, in
User-selectable, continuous auto-zero operation
accordance with the PSI5 specification. The device transmits
Electromechanical sensor self-test
10- or 16-bit acceleration data to the control module, and can
High resistance to electromagnetic interference (EMI)/
be configured to include either a 1-bit parity check, or a 3-bit
radio frequency interference (RFI)
cyclic redundancy check (CRC). The ADXL151 has a unique
4.5 V to 16.5 V operation
electronic serial number.
Electronic serial number Qualified for automotive applications
The ADXL151 is available in a 12-lead, 4 mm × 4 mm LFCSP package. The device is specified to operate over the ful
APPLICATIONS
automotive temperature range, from −40°C to +125°C.
Front impact crash sensing Side impact crash sensing FUNCTIONAL BLOCK DIAGRAM SENSOR ANALOG FRONT END (SAFE) DIGITAL SIGNAL PROCESSING COMMUNICATIONS INTERFACE MOSI g RANGE SPI MISO SPI PHY SCLK DLL CS BEAM 1 BEAM 2 OFFSET/ SERIAL OUTPUT AC DIGITAL AUTO- PORT DEMOD SENSITIVITY DATA Σ-Δ MOD AMP FILTER ZERO PSI5 I CALIBRATION REGISTER DLL PSI5 DATA PHY VBP OFFSET OFFSET VDD V OVER- OVR REG V REG DD X-AXIS, RANGE ERROR SINGLE AXIS OTP NVM SENSOR FLAG DIFFERENTIAL SELF- (SN, CAL, CONFIG) DRIVERS VBN XL TEST SENSOR DIE SELF- SELF- TEST TEST SHADOW RAM CHECK ERROR POR MASTER FLAG STATE MACHINE V TEST REGISTERS DD MONITOR TP1 TEST MUX DCC/TP2 TIMING STATE ERROR HANDLER GENERATOR MACHINE CLOCK
001 12859- Figure 1. For more information about the ADXL151, contact the Analog Devices, Inc., Customer Interaction Center at http://www.analog.com/technical_support to connect with a technical support specialist.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM NOTES