ADXL313 Datasheet PDF - Analog Devices

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ADXL313
Analog Devices

Part Number ADXL313
Description Digital Accelerometer
Page 28 Pages


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Data Sheet
3-Axis, ±0.5 g/±1 g/±2 g/±4 g
Digital Accelerometer
ADXL313
FEATURES
GENERAL DESCRIPTION
Ultralow power (scales automatically with data rate)
The ADXL313 is a small, thin, low power, 3-axis accelerometer
As low as 30 µA in measurement mode (VS = 3.3 V)
with high resolution (13-bit) measurement up to ±4 g. Digital
As low as 0.1 µA in standby mode (VS = 3.3 V)
output data is formatted as 16-bit twos complement and is
Low noise performance
accessible through either a serial port interface (SPI) (3-wire or
150 μg/√Hz typical for X- and Y-axes
4-wire) or I2C digital interface.
250 μg/√Hz typical for the Z-axis
Embedded, patent pending FIFO technology minimizes host
processor load
User-selectable resolution
Fixed 10-bit resolution for any g range
Fixed 1024 LSB/g sensitivity for any g range
Resolution scales from 10-bit at ±0.5 g to 13-bit at ±4 g
Built-in motion detection functions for activity/inactivity
monitoring
Supply and I/O voltage range: 2.0 V to 3.6 V
SPI (3-wire and 4-wire) and I2C digital interfaces
Flexible interrupt modes mappable to two interrupt pins
Measurement range selectable via serial command
Bandwidth selectable via serial command
Wide temperature range (−40°C to +105°C)
The ADXL313 is well suited for car alarm or black box applications.
It measures the static acceleration of gravity in tilt-sensing applica-
tions, as well as dynamic acceleration resulting from motion or
shock. Its high resolution (1024 LSB/g) and low noise (150 μg/√Hz)
enable resolution of inclination changes of as little as 0.1°. A built-
in FIFO facilitates using oversampling techniques to improve
resolution to as little as 0.025° of inclination.
Several built-in sensing functions are provided. Activity and
inactivity sensing detects the presence or absence of motion and
whether the acceleration on any axis exceeds a user-set level.
These functions can be mapped to interrupt output pins. An
integrated 32-level FIFO can be used to store data to minimize
host processor intervention, resulting in reduced system power
consumption.
10,000 g shock survival
Pb free/RoHS compliant
Small and thin: 5 mm × 5 mm × 1.45 mm LFCSP package
Qualified for automotive applications
APPLICATIONS
Low power modes enable intelligent motion-based power
management with threshold sensing and active acceleration
measurement at extremely low power dissipation.
The ADXL313 is supplied in a small, thin 5 mm × 5 mm ×
1.45 mm, 32-lead LFCSP package and is pin compatible with
Car alarms
the ADXL312 accelerometer device.
Hill start aid (HSA) systems
Electronic parking brakes
Data recorders (black boxes)
FUNCTIONAL BLOCK DIAGRAM
VS VDD I/O
ADXL313
POWER
MANAGEMENT
3-AXIS
SENSOR
SENSE
ELECTRONICS
ADC
DIGITAL
FILTER
CONTROL
AND
INTERRUPT
LOGIC
INT1
INT2
32-LEVEL
FIFO
SERIAL I/O
SDA/SDI/SDIO
SDO/ALT
ADDRESS
SCL/SCLK
GND
CS
Figure 1.
Rev. 0
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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.
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Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
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