概述

The ADXL344 is a versatile 3-axis, digital-output, low g MEMS accelerometer. Selectable measurement range and bandwidth and configurable, built-in motion detection make it suitable for sensing acceleration in a wide variety of applications. Robustness to 10,000 g/of shock and a wide temperature range (?40°C to +85°C) enable use of the accelerometer even in harsh environments.

The ADXL344 measures acceleration with high resolution (13-bit) measurement at up to ±16 g/. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface. The ADXL344 can measure the static acceleration of gravity in tilt-sensing appli-cations, as well as dynamic acceleration resulting from motion or shock. Its high resolution (3.9 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. Tap sensing detects single and double taps in any direction. Free-fall sensing detects if the device is falling. Orientation detection reports four- and six-position orientation and can trigger an interrupt upon change in orientation. These functions can be mapped individually to either of two interrupt output pins.

An integrated memory management system with a 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor activity and lower overall system power consumption.

The ADXL344 is supplied in a small, thin, 3 mm × 3 mm × 0.95 mm, 16-terminal, plastic package.

特点

10至13位分辨率的多用途加速度计，适用于各种不同的应用

可通过SPI（3和4线）和 I2C访问数字输出

内置运动检测功能使得单振、双振、活动、非活动、方向和自由落体检测都可忽略不计

  用户可调阈值

  中断可独立映射至两个中断引脚

低至23 μA的低功耗运行及嵌入式FIFO，可降低整体系统功耗

宽电源和I/O电压范围：1.7 V至2.75 V

宽工作温度范围（?40°C至+85°C）

抗冲击能力：10,000 g

小型、超薄、无铅、符合RoHS标准、3 mm × 3 mm × 0.95 mm LGA封装

应用

Handsets

Gaming and pointing devices

Personal navigation devices

Hard disk drive (HDD) protection