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815W113600XZ
815W113600XZ
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數(shù)字傳感器也可以接管有微控制器執(zhí)行的運(yùn)動(dòng)處理有關(guān)的任務(wù)。MCU當(dāng)然可以執(zhí)行相同的工作，但是功率效率要低得多——MCU的耗電是一毫安計(jì)算，傳感器則是微安。檢測自由落體、單點(diǎn)、雙擊(用戶動(dòng)作類似鼠標(biāo)點(diǎn)擊)、人像/景觀方向檢測等，是通過傳感器內(nèi)部邏輯實(shí)現(xiàn)的。MCU不需要進(jìn)行任何計(jì)算，只需要等待一個(gè)中斷觸發(fā)，并且只在它發(fā)生時(shí)對動(dòng)作作出反應(yīng)。
數(shù)字傳感器經(jīng)常集成可配置的過濾器，這些過濾器是用來測量加速度數(shù)據(jù)的?？墒褂玫屯?low-pass)、高通(high-pass)甚至是犯混疊過濾器，用于MCU預(yù)處理數(shù)據(jù)，并增加卸載分流。。
嵌入傳感器的數(shù)據(jù)緩沖器大多屬于先進(jìn)先出(FIFO)的類型，因?yàn)樗梢宰孧CU減少讀取數(shù)據(jù)的頻率，因此降低當(dāng)前電流消耗。這樣微控制器就可以執(zhí)行其他任務(wù)、延長休眠時(shí)間，同時(shí)也節(jié)省了與傳感器串口通訊所需的時(shí)間。
傳感器與微控制器之間的串行通信也會增加整體功耗。對超低功耗的應(yīng)用來說，每處理一個(gè)微安倍，串行通信都有可能產(chǎn)生重大影響。大多數(shù)MEMS加速計(jì)都是通過串行外設(shè)接口(SPI)和I2C接口進(jìn)行通信的。SPI接口在功耗方面效率更高，原因有三：一是通信線路上沒有會造成額外電流消耗的引線;二是支持更高的數(shù)據(jù)率;三是串行協(xié)議的開銷減少。
無論使用哪種接口，我們還是可以大幅減少串行通信，方法是讓應(yīng)用程序利用數(shù)據(jù)準(zhǔn)備中斷(data ready
interrupt)，而不進(jìn)行傳感器輪詢(polling)，也就是持續(xù)請求新數(shù)據(jù)的可用性狀態(tài)。當(dāng)傳感器完成數(shù)據(jù)測量和轉(zhuǎn)換后，數(shù)據(jù)準(zhǔn)備中斷自動(dòng)生成，新的數(shù)據(jù)集將由MCU讀取。當(dāng)這個(gè)中斷被激活時(shí)，MCU會馬上通過單一的讀取動(dòng)作，讀取來自傳感器的輸出數(shù)據(jù)。
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