ADXL345

The ADXL345 is a small, low-power 3-axis digital accelerometer with 13-bit resolution and up to ±16g measurement range. Interfaces via SPI or I2C. Features a 32-level FIFO buffer to minimise host processor load, plus activity/inactivity detection, tap/double-tap detection, and free-fall sensing. Compatible with 3.3V and 5V systems via onboard RT9161 regulator.

Features:

• Resolution: 13-bit (up to ±16g full scale)
• Interface: SPI (3- or 4-wire) or I2C
• Supply voltage: 3V – 5V (onboard regulator)
• Ultra-low power: 40μA measurement mode, 0.1μA standby @ 2.5V
• 32-level FIFO buffer
• Activity / inactivity detection
• Tap and double-tap detection
• Free-fall detection
• Wide temperature range: −40°C to +85°C
• Shock survival: 10,000g

Applications:

• Tilt and inclination sensing (<1° resolution)
• Motion, shock, and vibration detection
• Hard disk drive (HDD) protection
• Robotics, gaming, and medical instrumentation
• Personal navigation and fitness devices