6DR1900-5
6DR1900-5
6DR1900-5
《聯(lián)系人；歐先生》
《座機：0592-5709825》
《傳真：0592-5917519》
《24小時熱線：18030229053微信同步》
《QQ ：2479261344》
《QQ郵箱：2479261344@qq.com》
針對一些高要求的應(yīng)用程序，傳感器的運行模式可以迅速更換，只在真正有需要時,才會提高分辨率和數(shù)據(jù)傳輸速率。有些傳感器甚至能夠自動轉(zhuǎn)換模式。客戶可自行配置活動狀態(tài)下所需要的分辨率和數(shù)據(jù)傳輸速率，并自定義啟動它的條件。這時傳感器會進(jìn)入靜止?fàn)顟B(tài)，但仍會繼續(xù)測量數(shù)據(jù)，并以極低的數(shù)據(jù)傳輸速率和分辨率進(jìn)行，等出現(xiàn)設(shè)定條件(動作事件)才切換回到啟動狀態(tài)。
另一個不錯的設(shè)計原則是利用低供電水平，因為較低的供電水平也意味著更低的電流消耗。這就是為什么對于低功率的應(yīng)用，1.8V電源是首選。
在某些設(shè)計中，可以使用傳感器的功率循環(huán)。傳感器的電源只有在需要測量時才會被激活，否則傳感器就會處于關(guān)閉狀態(tài)。我們可以通過從微控制器的引腳上提供傳感器的電源來實現(xiàn)。如圖2所示。在應(yīng)用這種技術(shù)時，需要正確的計算功耗預(yù)算，因為每個傳感器的啟動都需要對其進(jìn)行配置和等待，直到輸出被確定，并提供正確的數(shù)據(jù)。
圖2：透過為控制微控制器針腳控制傳感器電源供應(yīng)
大多數(shù)MEMS加速計都是數(shù)字傳感器，這代表它們可以將測量的模擬信號轉(zhuǎn)換成數(shù)字?jǐn)?shù)據(jù)。因為有集成的模擬信號轉(zhuǎn)換器，加上對信號失真的敏感度較低，物料清單項目得以減少，但這并不是唯一的優(yōu)點。嵌入的中斷生成器MEMS加速計可以在滿足用戶設(shè)定的參數(shù)條件發(fā)生時，產(chǎn)生觸發(fā)信號，這就是用動作感應(yīng)喚醒功能的方式。微控制器(MCU)配置傳感器來產(chǎn)生一個喚醒觸發(fā)器，并進(jìn)入功耗極低的睡眠模式。當(dāng)一個動作被檢測到是，傳感器會產(chǎn)生一個中斷信號，MCU接到信號后會切換到一個合適的操作模式，然后處理剛剛發(fā)生的情況。
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(jìn)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)。
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