GENERAL DESCRIPTION
The ADXL345 is a small, thin, ultralow 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 for mobile device applications. It measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution (3.9 mg/LSB) enables measurement of inclination changes less than 1.0°.

FEATURES
   Ultralow power: as low as 23 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 memory management system with FIFO
      technology minimizes host processor load
   Single 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
   SPI (3- and 4-wire) and I2C digital interfaces
   Flexible interrupt modes mappable to either interrupt pin
   Measurement ranges selectable via serial command
   Bandwidth selectable via serial command
   Wide temperature range (−40°C to +85°C)
   10,000 g shock survival
   Pb free/RoHS compliant
   Small and thin: 3 mm × 5 mm × 1 mm LGA package

APPLICATIONS
   Handsets
   Medical instrumentation
   Gaming and pointing devices
   Industrial instrumentation
   Personal navigation devices
   Hard disk drive (HDD) protection