Analog Devices introduce the ADXL313, 3-axis accelerometer

Analog Devices ADXL313The ADXL313 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement up to ±4g. Digital output data is formatted as 16-bit twos complement and is accessible through either a serial port interface (SPI) (3-wire or 4-wire) or I2C digital interface.

 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.


Functional Block Diagram for ADXL313

Functional Block Diagram for ADXL313


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 the ADXL312 accelerometer device.


  • Car alarms
  • Hill start aid (HSA) systems
  • Electronic parking brakes
  • Data recorders (black boxes)



Ultralow power (scales automatically with data rate)

  • As low as 30 μA in measurement mode (VS = 3.3 V)
  • As low as 0.1 μA in standby mode (VS = 3.3 V)

Low noise performance

  • 150 μg/√Hz typical for X- and Y-axes
  •  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

Click here for the product data sheet