Datasheet ADXL251 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual-Axis, 60 g to 480 g Sensor with SPI and PSI5 |
| Pages / Page | 3 / 1 — Dual-Axis, 60 g. to 480 g. Sensor. with SPI and PSI5. Data Sheet. … |
| Revision | SpA |
| File Format / Size | PDF / 113 Kb |
| Document Language | English |
Dual-Axis, 60 g. to 480 g. Sensor. with SPI and PSI5. Data Sheet. ADXL251. FEATURES. GENERAL DESCRIPTION. User selectable sensor g
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Dual-Axis, 60 g to 480 g Sensor with SPI and PSI5 Data Sheet ADXL251 FEATURES GENERAL DESCRIPTION User selectable sensor g ranges: ±60 g , ±120 g , ±240 g , ±480 g
The ADXL251 is a dual-axis, integrated satel ite sensor with
Dual x-axis and y-axis sensor
user selectable g ranges, compliant to the PSI5 Version 2.1 airbag
Compliant to PSI5 Version 2.1 airbag substandard
substandard, and backwards compliant to PSI5 Version 1.3.
Synchronous operation
The ADXL251 (x-axis/y-axis) enables low cost solutions for
PSI5-P10P-500/3L and others
front impact and side impact airbags, as well as satellite sensor
Daisy-chain operation with bidirectional communication
and electronic control unit (ECU) main sensor applications.
Application level serial peripheral interface (SPI)
Acceleration data is sent to the control module via a digital,
communication
2-wire current loop PSI5 bus. Communication via the SPI bus
Selectable 16-bit or 10-bit sensor data
is also available for ECU applications.
Independently programmable g range and time slot for each
The device uses an ECC protected one time programmable
axis
(OTP) memory. The sensor g range is configurable to provide
Independent fault discrimination for each axis
ful -scale measurement of ±60 g, ±120 g, ±240 g, or ±480 g
Fully differential analog signal chain
acceleration. The user can program each axis independently
0.25 µs data interpolation routine
with multiple g ranges in different time slots. In PSI5 mode,
User selectable, continuous auto-zero operation
there are four programmable time slots available. The device
High resistance to electromagnetic interference (EMI) and
transmits 16-bit or 10-bit acceleration data to the control
radio frequency interference (RFI)
module, and can be configured to include either a 1-bit parity
SPI mode supply voltage: 3.3 V and 5 V, +5%
check, or a 3-bit cyclic redundancy check (CRC).
PSI5 mode supply voltage range: 4.5 V to 11.0 V
The ADXL251 is available in a 4 mm × 4 mm LFCSP package
Qualified for automotive applications
and is specified to operate over the ful automotive temperature
APPLICATIONS
range, −40°C to +125°C.
Front impact crash sensing Side impact crash sensing FUNCTIONAL BLOCK DIAGRAM X-AXIS ONLY X-AXIS ONLY X-AXIS/Y-AXIS V SENSOR ANALOG FRONT END (SAFE) SENSOR DIGITAL SIGNAL PROCESSING COMMUNICATIONS INTERFACE DDIO g RANGE MISO SPI MOSI DIGITAL OFFSET/ OUTPUT SPI PHY AC SCLK X-AXIS DEMOD FILTER AUTO- Σ-Δ MOD SENSITIVITY DATA AMP –3dB AT ZERO DLL CALIBRATION REGISTER SERIAL CS 400Hz PORT PSI5 PSI5 IDATA DLL PHY SENSOR SELF VBP DRIVERS TEST OFFSET OFFSET OVER- OVR V V DD DD RANGE ERROR X-AXIS ONLY FLAG REG CAP TIMING STATE REGISTER DETECT GENERATOR MACHINE FILE VBN DUAL-AXIS SELF SELF ACCELER ATION ERROR TEST TEST SENSOR DIE HANDLER CHECK ERROR DCC/TP2 FLAG POR MASTER ECC STATE Y-AXIS ONLY Y-AXIS ONLY MACHINE V NVM DD MONITOR SENSOR ANALOG FRONT END (SAFE) SENSOR DIGITAL SIGNAL PROCESSING REPAIR g RANGE TEST MUX TP1 NVM DIGITAL CONTROL OFFSET/ OUTPUT Y-AXIS AC CLOCK DEMOD FILTER AUTO- Σ-Δ MOD SENSITIVITY DATA AMP –3dB AT ZERO CALIBRATION REGISTER 400Hz OTP NVM (eFuse) SENSOR SELF DRIVERS TEST OFFSET OFFSET OVER- OVR RANGE ERROR Y-AXIS ONLY TIMING FLAG STATE GENERATOR MACHINE SELF SELF TEST TEST CHECK ERROR
001
FLAG
15454- Figure 1. For more information about the ADXL251, contact the Analog Devices, Inc., Customer Interaction Center at http://www.analog.com/technical_support 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 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 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 ©2017 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM NOTES
The ADXL251 is a dual-axis, integrated satel ite sensor with
Dual x-axis and y-axis sensor
user selectable g ranges, compliant to the PSI5 Version 2.1 airbag
Compliant to PSI5 Version 2.1 airbag substandard
substandard, and backwards compliant to PSI5 Version 1.3.
Synchronous operation
The ADXL251 (x-axis/y-axis) enables low cost solutions for
PSI5-P10P-500/3L and others
front impact and side impact airbags, as well as satellite sensor
Daisy-chain operation with bidirectional communication
and electronic control unit (ECU) main sensor applications.
Application level serial peripheral interface (SPI)
Acceleration data is sent to the control module via a digital,
communication
2-wire current loop PSI5 bus. Communication via the SPI bus
Selectable 16-bit or 10-bit sensor data
is also available for ECU applications.
Independently programmable g range and time slot for each
The device uses an ECC protected one time programmable
axis
(OTP) memory. The sensor g range is configurable to provide
Independent fault discrimination for each axis
ful -scale measurement of ±60 g, ±120 g, ±240 g, or ±480 g
Fully differential analog signal chain
acceleration. The user can program each axis independently
0.25 µs data interpolation routine
with multiple g ranges in different time slots. In PSI5 mode,
User selectable, continuous auto-zero operation
there are four programmable time slots available. The device
High resistance to electromagnetic interference (EMI) and
transmits 16-bit or 10-bit acceleration data to the control
radio frequency interference (RFI)
module, and can be configured to include either a 1-bit parity
SPI mode supply voltage: 3.3 V and 5 V, +5%
check, or a 3-bit cyclic redundancy check (CRC).
PSI5 mode supply voltage range: 4.5 V to 11.0 V
The ADXL251 is available in a 4 mm × 4 mm LFCSP package
Qualified for automotive applications
and is specified to operate over the ful automotive temperature
APPLICATIONS
range, −40°C to +125°C.
Front impact crash sensing Side impact crash sensing FUNCTIONAL BLOCK DIAGRAM X-AXIS ONLY X-AXIS ONLY X-AXIS/Y-AXIS V SENSOR ANALOG FRONT END (SAFE) SENSOR DIGITAL SIGNAL PROCESSING COMMUNICATIONS INTERFACE DDIO g RANGE MISO SPI MOSI DIGITAL OFFSET/ OUTPUT SPI PHY AC SCLK X-AXIS DEMOD FILTER AUTO- Σ-Δ MOD SENSITIVITY DATA AMP –3dB AT ZERO DLL CALIBRATION REGISTER SERIAL CS 400Hz PORT PSI5 PSI5 IDATA DLL PHY SENSOR SELF VBP DRIVERS TEST OFFSET OFFSET OVER- OVR V V DD DD RANGE ERROR X-AXIS ONLY FLAG REG CAP TIMING STATE REGISTER DETECT GENERATOR MACHINE FILE VBN DUAL-AXIS SELF SELF ACCELER ATION ERROR TEST TEST SENSOR DIE HANDLER CHECK ERROR DCC/TP2 FLAG POR MASTER ECC STATE Y-AXIS ONLY Y-AXIS ONLY MACHINE V NVM DD MONITOR SENSOR ANALOG FRONT END (SAFE) SENSOR DIGITAL SIGNAL PROCESSING REPAIR g RANGE TEST MUX TP1 NVM DIGITAL CONTROL OFFSET/ OUTPUT Y-AXIS AC CLOCK DEMOD FILTER AUTO- Σ-Δ MOD SENSITIVITY DATA AMP –3dB AT ZERO CALIBRATION REGISTER 400Hz OTP NVM (eFuse) SENSOR SELF DRIVERS TEST OFFSET OFFSET OVER- OVR RANGE ERROR Y-AXIS ONLY TIMING FLAG STATE GENERATOR MACHINE SELF SELF TEST TEST CHECK ERROR
001
FLAG
15454- Figure 1. For more information about the ADXL251, contact the Analog Devices, Inc., Customer Interaction Center at http://www.analog.com/technical_support 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 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 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 ©2017 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM NOTES
