ST LSM303DLH 3D数字线性加速度传感方案

ST 公司的LSM303DLH 是3D数字线性加速度传感器和3D数字磁传感器,满刻度的线性加速度为±2 g / ±4 g / ±8 g,满刻度磁场为±1.3/±1.9/±2.5/±4.0/±4.7/±5,6/±8.1高斯,两者都由用户选择.模拟工作电压2.5V-3.3V,数字电源I/O电压为1.8V,3个磁场通路和3个加速度通路,6D取向检测,主要用在地图旋转和显示器取向,电子罗盘,手持设备,震动检测和补偿等.本文介绍LSM303DLH主要特性, 电连接图和采用I2C快速模式的电连接图.

The LSM303DLH is a system-in-package featuring a 3D digital linear acceleration sensor and a 3D digital magnetic sensor. The various sensing elements are manufactured using specialized micromachining processes, while the IC interfaces are realized using a CMOS technology that allows the design of a dedicated circuit which is trimmed to better match the sensing element characteristics. The LSM303DLH has a linear acceleration full-scale of ±2 g / ±4 g / ±8 g and a magnetic field full-scale of ±1.3/±1.9/±2.5/±4.0/±4.7/±5,6/±8.1 gauss, both fully selectable by the user. The LSM303DLH includes an I2C serial bus interface that supports standard mode (100 kHz) and fast mode (400 kHz). The internal self-test capability allows the user to check the functioning of the whole module in the final application. The system can be configured to generate an interrupt signal by inertial wakeup/free-fall events, as well as by the position of the device itself. Thresholds and timing of interrupt generators are programmable on the fly by the end user. Magnetic and accelerometer parts can be enabled or put in power-down mode separately. The LSM303DLH is available in a plastic land grid array (LGA) package, and is guaranteed to operate over an extended temperature range from -30 to +85℃.

LSM303DLH 主要特性:

■ Analog supply voltage: 2.5 V to 3.3 V

■ Digital supply voltage IOs: 1.8 V

■ Power-down mode

■ 3 magnetic field channels and 3 acceleration channels

■ ±1.3 to ±8,1 gauss magnetic field full-scale

■ ±2 g/±4 g/±8 g dynamically selectable fullscale

■ 16-bit data out

■ I2C serial interface

■ 2 independent programmable interrupt generators for free-fall and motion detection

■ Embedded self-test

■ Accelerometer sleep-to-wakeup function

■ 6D orientation detection

■ ECOPACK® RoHS and “Green” compliant

LSM303DLH 应用:

■ Compensated compassing

■ Map rotation

■ Position detection

■ Motion-activated functions

■ Free-fall detection

■ Intelligent power-saving for handheld devices

■ Display orientation

■ Gaming and virtual reality input devices

■ Impact recognition and logging

■ Vibration monitoring and compensation

图1.LSM303DLH 方框图

图2.LSM303DLH电连接图(1): 推荐的I2C快速模式

图3.LSM303DLH电连接图(2)