FCS011EW0011A02N是一個低功耗的器件，當(dāng)運(yùn)行在1MHz的時鐘條件下，系統(tǒng)的工作電流為220μA，而待命模式的工作電流僅為0.5μA，保持RAM的節(jié)電模式的工作電流更是只有0.1μA，這樣的低功耗完全可以利用電池供電，適合于便攜式的測量。 本系統(tǒng)利用MSP430F2013進(jìn)行智能數(shù)據(jù)采集，從前端傳感器采集來的數(shù)據(jù)經(jīng)過程控增益放大器進(jìn)行放大，隨后進(jìn)入模數(shù)轉(zhuǎn)換器進(jìn)行模數(shù)轉(zhuǎn)換，轉(zhuǎn)換完成后以異步串行的方式輸出為簡化系統(tǒng)，同時避免外部晶振對系統(tǒng)的影響，系統(tǒng)采用內(nèi)部FCS011EW0011A02N作為時鐘，系統(tǒng)利用差分傳輸數(shù)據(jù)，無需進(jìn)行數(shù)據(jù)的隔離。本應(yīng)用中配置傳輸速率為9600b/s，可以用串口設(shè)定匹配的波特率進(jìn)行接收。 無論系統(tǒng)采用內(nèi)部參考電壓還是外部參考電壓，輸入電壓都有相應(yīng)的范圍，所以前端模擬量的輸入要用穩(wěn)壓管進(jìn)行限幅。 系統(tǒng)可以根據(jù)外界信號的大小調(diào)節(jié)轉(zhuǎn)換的精度，只需拉高P2.6同時調(diào)節(jié)外部輸入的模擬量為所測量的最大值，這時系統(tǒng)將自動調(diào)整PGA（程控增益放大器）。 由于采用半雙工的差分傳輸，系統(tǒng)很容易進(jìn)行擴(kuò)展，系統(tǒng)可以利用多個傳感器組成一個傳感器網(wǎng)絡(luò)，通過總線控制傳感器采集數(shù)據(jù)。
初始化
初始化部分主要完成以下功能。
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