ADXL345 Triple Axis Accelerometer Board

Product Description The ADXL345 is a small, thin, ultra-low power 3-axis accelerometer with high-resolution measurement capabilities up to ±16g. This module converts acceleration into a 13-bit digital signal accessible via I2C or SPI interfaces. It is specifically designed to measure both dynamic acceleration resulting from motion or shock and static acceleration, such as gravity, which allows it to function as a high-accuracy tilt sensor. With built-in specialized sensing functions like tap/double-tap detection, activity/inactivity monitoring, and free-fall detection, the ADXL345 is the preferred choice for drone stabilization, industrial vibration monitoring, and mobile device orientation.

Key Features

• Variable Sensitivity Ranges: User-selectable measurement ranges of ±2g, ±4g, ±8g, and ±16g for diverse application needs.

• High Resolution: 13-bit resolution at all g-ranges maintains a consistent 4 mg/LSB sensitivity.

• Intelligent Sensing: Integrated hardware detection for single tap, double tap, activity, inactivity, and free-fall events.

• Ultra-Low Power: Draws as little as 40 µA in measurement mode and 0.1 µA in standby, making it ideal for battery-operated IoT.

• Dual Communication: Supports both I2C and 4-wire/3-wire SPI protocols for universal microcontroller compatibility.

Technical Details

• Sensing Technology: MEMS-based capacitive sensor with an integrated signal conditioning ASIC.

• Voltage Regulation: On-board LDO regulator allows for a wide input voltage range of 3.3V to 5V.

• Digital Output: Data is formatted as 16-bit two's complement, accessible through the digital interface.

• FIFO Buffer: Features a 32-level first-in, first-out (FIFO) buffer to minimize host processor load and power consumption.

• Flexible Sampling: Output data rates range from 0.1 Hz to 3200 Hz, allowing for trade-offs between speed and power.

• Interrupt Pins: Provides two programmable interrupt pins to alert the MCU of specific motion events.

• Shock Resistance: Designed to withstand high mechanical shocks up to 10,000g without failure.

• Bandwidth Control: Digital filters allow for adjustable bandwidth to suit vibration or tilt sensing applications.

• I2C Addressing: Default address is 0x53; can be modified by toggling the SDO/ALT ADDRESS pin.

• PCB Construction: High-quality FR-4 with gold-plated pads for superior electrical contact.

• Self-Test Feature: Includes a dedicated self-test pin to verify sensor functionality in-system.

• Operating Temperature: Stable performance across an industrial range of -40°C to +85°C.

• Logic Level Shift: Most breakout versions include level shifters, making them safe for use with 5V Arduino logic.

• Miniature Size: Compact footprint allows for easy mounting on moving parts of a robotic arm or drone frame.

• Supply Current: Current consumption scales automatically with the output data rate.