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ADXL345:  3-AXIS, ±2 G/±4 G/±8 G/±16 G DIGITAL ACCELEROMETER

The ADXL345 is a small, thin, low 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 acces-sible through either a SPI (3- or 4-wire) or I2C digital interface.

The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in ...More

ADXL345:  3-AXIS, ±2 G/±4 G/±8 G/±16 G DIGITAL ACCELEROMETER

Product Description

The ADXL345 is a small, thin, low 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 acces-sible through either a SPI (3- or 4-wire) or I2C digital interface.

The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing appli-cations, 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 detect 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.

The ADXL345 is supplied in a small, thin, 3 mm × 5 mm × 1 mm, 14-lead, plastic package.

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  • Ultralow power: as low as 40 μA in measurement mode and 0.1 μA in standby mode at VS = 2.5 V (typical)
  • Power consumption scales automatically with bandwidth
  • User-selectable resolution
    Fixed 10-bit resolution
    Full resolution, where resolution increases with g range, up to 13-bit resolution at ±16 g (maintaining 4 mg/LSB scale factor in all g ranges)
  • Embedded, patent pending FIFO technology minimizes host processor load
  • Tap/double tap detection
  • Activity/inactivity monitoring
  • Free-fall detection
  • Supply voltage range: 2.0 V to 3.6 V
  • I/O voltage range: 1.7 V to VS
  • See data sheet for additional features
  • Output Type: Digital
  • Typical Bandwidth (kHz): 1.6kHz
  • Voltage Supply (V): 2.0 to 3.6
  • Range: +/- 2/4/8/16g
  • Sensitivity: up to 256 LSB/g
  • # of Axes: 3
  • Sensitivity Accuracy (%): ±10n/a
  • Temp Range (°C): -40 to 85°C
  • Package: 3mm x 5mm x 1mm LGA
  • Supply Current : 145µA

ADXL345 Functional Block Diagram

Circuits from the Lab

Find more at our Circuits Library.

ADXL345 Development Board

The iMEMS® ADXL345 Development Board is an easy-to-use tool that facilitates prototyping by providing a platform that can be duplicated in the final application. The development board is pre-configured as a datalogger that can be used to gather data for refining algorithms, tuning thresholds, and generally familiarizing oneself with accelerometer data. A suite of software provided with the board allows the user to reprogram the board per the user's needs, and a set of standard headers facilitates the addition of expansion boards.

The ADXL345 Development Board is powered by two AAA batteries and is completely untethered (except during reprogramming). This form factor allows it to integrate seamlessly into portable applications. Communications and processing are performed by an ARM7-based ADuC7024 micro-controller. Data is logged onto a MicroSD memory card, providing essentially unlimited memory capacity and operating system versatility. Data is stored in a text file; therefore, there is no need to install any software to operate the board or read data.

User Guide: Stand alone instructions for using the ADXL345 Development Board.
Firmware: Instructions for updating firmware are included in the user guide.
Software Tools: Download useful software tools for the kit.
Plotting Tool: A handy tool for plotting your data output.
Code: Use this program for loading code.
Sample Project: Click here to see an example of a project using the development kit.
Watch Video: You can see the ADXL345 Development Board in action.

You can order the EVAL-ADXL345Z-DB below by “Adding to Cart”

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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.