FREESCALE的三軸加速傳感器設計方案

概述: 加速度傳感器用于檢測傾斜、運動、定位、振動和撞擊力下產生的變化。對那些需要以小型封裝結構滿足快速響應、高靈敏度、低電流消耗、低電壓操作和待機模式的消費電子客戶來說飛思卡爾加速度傳感器是理想的選

主要特性：

MMA7260QT低成本微型電容式加速度傳感器采用了信號調理、單極低通濾波器和溫度補償技術，并且提供4個量程可選，用戶可在4個靈敏度中的選擇。該器件帶有低通濾波并已做零g補償。本產品還提供休眠模式，因而是電池充電的手持設備產品的理想之選。

特性

可選靈敏度(1.5g/2g/4g/6g)

低功耗：500 μA

休眠模式： 3 μA

低壓運行：2.2 V - 3.6 V

6mm x 6mm x 1.45 mm的無引線四方扁平 (QFN) 封裝;

高靈敏度(800 mV/g @ 1.5g)

快速開啟

低通濾波器具備內部信號調理

設計穩定、防震能力強

無鉛焊接

環保封裝

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.

方案參考原理圖：

參考pcb：