The ADXL346 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 an SPI （3- or 4-wire） or I2 C digital interface. The ADXL346 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 （4 mg/LSB） enables measurement of inclination changes of less than 1.0°。 Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion by comparing the acceleration on any axis with user-set thresholds. Tap sensing detects single and double taps in any direction. Freefall sensing detects if the device is falling. Orientation detection is capable of concurrent four- and six-position sensing and a user-selectable interrupt on orientation change for 2D or 3D applications. These functions can be mapped individually to either of two interrupt output pins. An integrated memory management system with 32-level first in， first out （FIFO） buffer can be used to store data to minimize host processor activity and lower overall system power consumption. Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation. The ADXL346 is supplied in a small， thin， 3 mm × 3 mm × 0.95 mm， 16-lead， plastic package.