ADXL312

Data Sheet ADXL312 3-Axis, ±1.5 g/±3 g/±6/ g/±12 g Digital Accelerometer 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) FUNCTIONAL BLOCK DIAGRAM 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. The ADXL312 is well suited for car alarm or black box appli...