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    6GK7342-5DA03-0XE0
    發(fā)布者:gw0002  發(fā)布時間:2018-08-22 09:52:32  訪問次數(shù):134

    6GK7342-5DA03-0XE0

    6GK7342-5DA03-0XE0

    6GK7342-5DA03-0XE0

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    數(shù)字傳感器也可以接管有微控制器執(zhí)行的運動處理有關(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的耗電是一毫安計算,傳感器則是微安。檢測自由落體、單點、雙擊(用戶動作類似鼠標(biāo)點擊)、人像/景觀方向檢測等,是通過傳感器內(nèi)部邏輯實現(xiàn)的。MCU不需要進行任何計算,只需要等待一個中斷觸發(fā),并且只在它發(fā)生時對動作作出反應(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。可使用低通(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先出(FIFO)的類型,因為它可以讓MCU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)、
    延長休眠時間,同時也節(jié)省了與傳感器串口通訊所需的時間。

    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加速計都是通過串行外設(shè)接口(SPI)和I2C接口進行通信的。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)備中斷自動生成,新的數(shù)據(jù)集將由MCU讀取。當(dāng)這個中斷被激活時,MCU會馬上通過單一的讀取動作,讀取來自傳感器的輸出數(shù)據(jù)。

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