ADXL345 Accelerometer Breakout Board

3 Axis I2C digital Accelerometer with breakout board

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The ADXL345 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface. 

The ADXL345 is well suited to measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution (4 mg/LSB) enables measurement of inclination changes less than 1.0°.

Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion and if the acceleration on any axis exceeds a user-set level. Tap sensing detects single and double taps. Free-fall sensing detects if the device is falling. These functions can be mapped to one of two interrupt output pins. An integrated, patent pending 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor intervention. Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation.





  • Ultralow power: as low as 40 μA in measurement mode and 0.1 μA in standby mode at VS = 2.5 V (typical) 
  • Power consumption scales automatically with bandwidth 
  • User-selectable resolution :
    Fixed 10-bit resolution 
    Full resolution, where resolution increases with g range, 
  • up to 13-bit resolution at ±16 g (maintaining 4 mg/LSB scale factor in all g ranges)
  • Embedded, patent pending FIFO technology minimizes host processor load 
  • Tap/double tap detection 
  • Activity/inactivity monitoring 
  • Free-fall detection 
  • Supply voltage range: 2.0 V to 3.6 V 
  • I/O voltage range: 1.7 V to VS
  • I2C interface
  • Measurement ranges selectable via serial command 
  • Bandwidth selectable via serial command 
  • Wide temperature range (−40°C to +85°C) 
  • 10,000 g shock survival