Google日前發(fā)布最新Android 4.4 KitKat操作系統(tǒng)，可在應用處理器關閉的情況下，執(zhí)行管理實時定位追蹤與情境感知等新功能，其目標在于提升電池的續(xù)航力。通常這意味著可透過傳感器中樞來卸除應用處理器，而InvenSense公司看好KitKat瞄準下一個10億使用者的龐大商機，直接將這些功能建置于其最新6軸加速度計/陀螺儀的數(shù)字動作處理器(DMP)中。

為了提升裝置的電池續(xù)航力，Google最新Android 4.4 KitKat操作系統(tǒng)可在應用處理器卸除時，由智能傳感器提供實時情境感知功能。
Source：Googleqd2esmc

InvenSense公司營銷與業(yè)務開發(fā)副總裁Ali Foughi表示，“Google新一代 Android KitKat需要許多新的傳感器功能，但這將會造成成本增加或不利于傳感器作業(yè)的缺點，因此我們推出了內建 DMP 的新款6軸MPU-6515 ?！? MPU-6515結合了3軸加速度計與3軸陀螺儀于在同封裝中，并搭配增強版的 DMP──專門設計用于處理 Android KitKat在AP卸除時所需執(zhí)行的功能。 “Google KitKat期望傳感器能隨時啟動，以提供立即尋址與情境感知功能，在無需使用傳感器中樞的情況下維持電池的低功耗作業(yè)；或者，也可以透過我們的芯片方案來實現(xiàn)?！? 特別是在傳感器中樞閑置期間， Android KitKat可暫時關閉應用處理器，在發(fā)生假觸發(fā)的明顯動作中斷后才切換響應用處理器。KitKat還需要計步器功能，包括步伐偵測與步數(shù)。在需要精確的慣性定位與追蹤而應用處理器關閉時，KitKat需要在中斷之間采用6軸旋轉向量，包括融合加速度計與陀螺儀傳感器的輸出。新一批模式可以緩沖在顯著動作之間的事件。

InvenSense的6軸加速度計/陀螺儀芯片MPU-6545增強其DMP硬件加速引擎，可處理Android KitKat新的情境感知新功能。
Source：InvenSenseqd2esmc

“我們可以采用有╱或無傳感器中樞的方法，”Foughi說，“這款具有增強版DMP的MPU-6515是專為Android KitKat在AP卸除而傳感器中樞處于睡眠模式時所需處理的任務而設計的?！? MPU- 6515的尺寸僅3mm x 3mm x 0.9mm，適用于智能手機、平板電腦、可穿戴設備以及物聯(lián)網(wǎng)(IOT)等設備。其接腳兼容InvenSense上一代的MPU-6500，該組件已應用于Android Jelly Bean設備。該公司表示，新的MPU-6515目前已量產(chǎn)，并已用于幾款執(zhí)行Android KitKat的設備中。 本文授權編譯自EE Times，版權所有，謝絕轉載 參考英文原文：Motion Processing for Android KitKat，by R. Colin Johnson

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{pagination} Motion Processing for Android KitKat R. Colin Johnson PORTLAND, Ore. -- The new Android 4.4 KitKat operating system announced by Google yesterday aims to save battery life by mandating that real-time location tracking and contextual awareness functions run in the background while the application processor is off. Usually, that means using a sensor hub to offload the application processor, but in anticipation of KitKat, InvenSense has built those functions into the on-chip digital motion processor (DMP) of its recently announced six-axis combo accelerometer/gyroscope. To keep the battery from running down, Google's new Android 4.4 KitKat operating system mandates that smart sensors provide real-time contextual awareness functions while the application processor is off. (Source: Google) "Google's new Android KitKat requires that many new sensor functions to run either in a sensor hub, which has the disadvantage of added cost, or in the sensor itself, which is the case with our new six-axis MPU-6515, which has its own digital motion processor." Ali Foughi, vice president of marketing and business development at InvenSense, told us. The MPU-6515 combines a three-axis accelerometer with a three-axis gyroscope in the same package with an enhanced version of its DMP that has been specifically geared to handle the functions Android KitKat mandates running while the application processor is off. "Google with KitKat wants the sensor to be on more of the time, to provide real-time location and context awareness features, which would run the battery down without a sensor hub or, alternatively, using our chip." In particular, during periods of inactivity, Android KitKat aims to shut down the application processor and then wait for a "significant-motion" interrupt with fewer false triggers before switching the application processor back on. KitKat also requires that pedometer functions, including step detect and step count, run in the background. For accurate inertial location tracking while the application processor is off, KitKat requires that six-axis rotation vectors, which involve fusing the outputs of accelerometer and gyroscope sensors, be taken periodically between interrupts. And a new batch mode allows for buffering these events between significant-motion interrupts. Invensense's MPU-6515 six-axis combo accelerometer and gyroscope chip has enhanced its on-chip digital motion processor to handle new contextual awareness in Android KitKat. "We can work with a hub or hubless approach," said Foughi. "Our new MPU-6515 with enhanced DMP has been designed to handle Android KitKat functions while the application processor and the hub, if present, is asleep." The MPU-6515 measures a scant 3 mm by 3 mm by 0.9 mm for use in smartphones, tablets, wearables, and Internet of Things (IoT) devices. It is pin-compatible with InvenSense's previous MPU-6500 model, which is being used in Android Jelly Bean devices. The company said the new version is in production and has already been adopted by several devices (which it would not name) running Android KitKat.