GENERAL DESCRIPTION
The ADXL3121 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement up to ±12 g. Digital output data is formatted as 16-bit twos complement and is accessible through either a serial port interface (SPI) (3- or 4-wire) or I2C digital interface.

FEATURES
    Ultralow power: as low as 57 µA in measurement mode and 0.1 µA in standby mode at VS = 3.3 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 ±12 g (maintaining 2.9 mg/LSB scale factor in all g ranges)
    Embedded FIFO technology minimizes host processor load
    Built-in motion detection functions for activity/inactivity monitoring
    Supply and I/O voltage range: 2.0 V to 3.6 V
    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 to +105°C)
    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
    Car alarm
    Hill start aid (HSA)
    Electronic parking brake
    Data recorder (black box)