The Analog Devices ADXL345 is a small, thin, low-power, 3-axis accelerometer with high-resolution (13-bit) measurement at up to ±16 g. Digital output data are formatted as 16-bit Twos Complement, and are accessible through either an SPI (3- or 4-wire) or I2C digital interface.
The ADXL345 is well suited to measure 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 detects 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.
ADXL345 Accelerometer Board Features
- 2.0V to 3.6V DC Supply Voltage
- Ultra Low Power: 40µA in measurement mode, 0.1µA in standby @ 2.5V
- Tap/Double-Tap Detection
- Free-Fall Detection
- SPI and I2C interfaces
ADXL345 Accelerometer Board Resources