FREESCALE的三轴加速传感器设计方案

 概述: 加速度传感器用于检测倾斜、运动、定位、振动和撞击力下产生的变化。对那些需要以小型封装结构满足快速响应、高灵敏度、低电流消耗、低电压操作和待机模式的消费电子客户来说飞思卡尔加速度传感器是理想的选

主要特性：

MMA7260QT低成本微型电容式加速度传感器采用了信号调理、单极低通滤波器和温度补偿技术，并且提供4个量程可选，用户可在4个灵敏度中的选择。该器件带有低通滤波并已做零g补偿。本产品还提供休眠模式，因而是电池充电的手持设备产品的理想之选。

特性

可选灵敏度(1.5g/2g/4g/6g)

低功耗：500 μA

休眠模式： 3 μA

低压运行：2.2 V - 3.6 V

6mm x 6mm x 1.45 mm的无引线四方扁平 (QFN) 封装;

高灵敏度(800 mV/g @ 1.5g)

快速开启

低通滤波器具备内部信号调理

设计稳定、防震能力强

无铅焊接

环保封装

成本低

方案特性：

The MMA7260QT has many unique features such as low power, low current, a quick turn on time, and 3-axis sensing with g-select all in a small QFN package. The STAR enables the user to quickly see many capabilities of the device along with application ideas to pursue. In addition, with data download capability, the STAR provides a quick way to prototype a software solution to gain a better understanding for the capability of the device.

A software program was developed to provide an interface as well as a development system. The software can be used for displaying the 8-bit ADC values sent through the RS232 connection, or utilized for analyzing accelerometer data to demonstrate end applications.

For a final design, the g-Select is best configured to additional I/O of a chosen microcontroller. Therefore, the sensitivity of the device could be easily changed with a quick change in the software. In addition, the software can be configured so that different sensitivities can be used for several applications, where theMCU drives the g-Select during different modes of operation.

方案参考原理图：

参考pcb：