High Precision, Low-g
, Digital
Z-Axis Accelerometer
Data Sheet
ADXL701
Rev. SpA Document Feedback
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FEATURES
High performance, z-axis digital output accelerometer
±14.2 g full-scale range at 16-bit resolution (0.434 mg/LSB)
2 kHz output sample rate with optional data FIFOs
Programmable filter response
20 Hz, 46 Hz, 92 Hz, 184 Hz
Continuous electromechanical self test
Additional key-on and on demand self test routines
Z-axis offset adjust
Low quiescent current draw
High linearity performance
Qualified for automotive applications
−40°C to +105°C temperature range
APPLICATIONS
Vehicle rollover detection
Platform stabilization/leveling
GENERAL DESCRIPTION
The ADXL701 device is a high precision, single z-axis
accelerometer designed for vehicle rollover detection and other
high performance applications. The ADXL701 provides offset
stability to better than ±500 mg and sensitivity stability to better
than 5% across the entire temperature range. The ADXL701 is
designed with selectable −3 dB filter corner frequencies to
satisfy a range of applications, and the 2 kHz output data rate
allows sufficient oversampling of the acceleration information.
The acceleration data output from the device is a true 16-bit
word and is contained in a 32-bit SPI transaction. The SPI
interface contains additional fault detection bits and data
formatting bits designed to assist high reliability applications.
SPI communications are compatible up to 8 MHz. The 16-bit
acceleration data-word offers a resolution of 0.434 mg/LSB for
the ±14.2 g full-scale range of the device.
The ADXL701 is available in an SOIC package with an inverted
paddle for improved EMI/RFI robustness. The ADXL701
operates at nominal power supplies of 3.3 V and 5 V, and is
specified to operate across the full automotive temperature
range of −40°C to +105°C.
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
For more information about the ADXL701, 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.
SPI INT E RFACE
SCLK
CS
MOSI
MISO
IOVDD
DVDD
VCM
Z
AFE THIRD-ORDER
SINC FILTER IIR FILTER
BYPASS CALIBRATION FORMAT
Σ-Δ
MOD
TEMP
SENSOR THIRD-ORDER
SINC FILTER IIR FILTER CALIBRATION FORMAT
Σ-Δ
MOD
SENSOR
DRIVERS SELF
TEST
CLOCK
CAL COEFFICIENT
GENERATION
DSP
TIMING GEN CONTROL
REGISTER
MASTER DSP
ST ATE MACHINE
VDD
MONITOR
POR
ERROR
HANDLER
OTP
SERIAL
NUMBER
CONFIG
TRIM
COEFFICIENT
ERROR
FLAGS
REGVDD
AVDD
REGGND
IOGND
VDD
REG
REFERENCE
ADXL701
12411-001
