Description
Product Overview
The ADXL345 Digital Angle Acceleration Sensor Module is a high-performance, ultra-low power, 3-axis accelerometer designed to measure both static gravity (for tilt/inclination) and dynamic acceleration (from motion or shock). Built around the industry-standard Analog Devices ADXL345 chip, this module is widely used in robotics, IoT devices, smartphones, gaming controllers, and industrial monitoring systems.
Unlike analog accelerometers that require complex ADC calculations, the ADXL345 provides digital output via I2C or SPI interfaces, delivering 16-bit digital values directly to your microcontroller . With selectable measurement ranges of ±2g, ±4g, ±8g, and ±16g and up to 13-bit resolution, it can detect inclination changes of less than 1.0° .
The module features an onboard 3.3V voltage regulator and logic-level shifting, making it compatible with both 3.3V and 5V microcontrollers like Arduino, ESP32, ESP8266, STM32, and Raspberry Pi . Its advanced motion detection capabilities—including tap/double-tap detection, free-fall detection, and activity/inactivity monitoring—enable sophisticated gesture and context-aware applications without burdening the host processor.
Key Features
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3-Axis Digital Accelerometer: Simultaneously measures acceleration on X, Y, and Z axes for comprehensive motion and tilt sensing .
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Selectable Measurement Ranges: User-selectable ranges of ±2g, ±4g, ±8g, and ±16g, allowing optimization for either sensitive tilt detection or high-impact shock measurement .
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High Resolution: Up to 13-bit resolution (4 mg/LSB scale factor in all g-ranges), enabling precise detection of inclination changes less than 1.0° .
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Ultra-Low Power Consumption: Consumes as little as 23 µA in measurement mode and 0.1 µA in standby mode (at 2.5V), making it ideal for battery-powered IoT and wearable devices .
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Dual Digital Interfaces: Supports both I2C and SPI (3-wire or 4-wire) communication protocols for maximum flexibility with different microcontrollers .
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Built-in Motion Detection Features:
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Single/Double Tap Detection for gesture recognition
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Free-Fall Detection for drop protection applications
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Activity/Inactivity Monitoring for intelligent power management
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32-Level FIFO Buffer: Integrated memory buffer stores up to 32 samples, reducing host processor load and enabling burst data collection while the microcontroller sleeps .
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Programmable Interrupt Pins: Two interrupt pins (INT1, INT2) can be mapped to specific events (data ready, tap, free-fall, etc.) for efficient wake-up and event-driven systems .
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Wide Operating Voltage: Core sensor operates from 2.0V to 3.6V; breakout boards typically include 3.3V regulators and level shifters for 5V compatibility .
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Industrial Temperature Range: Rated for -40°C to +85°C (standard) with -55°C to +105°C available on EP version, suitable for demanding environments .
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Operating Voltage (Sensor Core) | 2.0V – 3.6V DC |
| Operating Voltage (Module with Regulator) | 3.3V – 5V DC (typical) |
| Measurement Ranges (Selectable) | ±2g, ±4g, ±8g, ±16g |
| Resolution (Max) | 13-bit (4 mg/LSB) |
| Output Data Rate | 0.1 Hz – 3200 Hz (configurable) |
| Communication Interfaces | I2C, SPI (3-wire or 4-wire) |
| Current Consumption (Measurement Mode) | 23 µA – 140 µA (depending on data rate) |
| Current Consumption (Standby Mode) | 0.1 µA |
| FIFO Buffer Size | 32-level |
| Operating Temperature | -40°C to +85°C (standard), -55°C to +105°C (EP version) |
| Shock Survival Rating | 10,000 g |
| Package Dimensions (IC) | 3mm × 5mm × 1mm LGA-14 |
| Module Dimensions (Typical) | 20mm × 20mm (breakout board) |
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