電容觸摸測試MCU的靈活性

　　電容式觸控技術廣泛應用于從智能手機到冰箱和汽車的電子產品。在許多應用中，電容式觸摸傳感器提供輸入到一個專用的控制器芯片。MCU直接參與當控制器集成為一個外圍單片機上死去。

　　無論MCU是否有集成在芯片上的傳感器/控制器電路或觸摸傳感器的信息來在一個專用的設備，MCU必須處理的電容觸摸輸入產生的一些問題，以達到滿意的用戶體驗。這些措施包括延遲（及時響應用戶），精度和能源消耗。能源消耗在電池供電設備中尤為重要。

　　MCU供應商提供各種各樣的電容式觸摸解決方案，從專門的外設到超低功耗接口與電容式觸摸傳感器的電池供電的應用。在審查解決方案，但是，電容式觸摸技術的快速回顧應該是有幫助的。

　　Capacitive touch basics

　　Sensors in general present special design problems and capacitive touch sensors are no different. Much of the complexity is due to the fact that the distributed nature of sensor electric fields make “lumped element” approximation of their behavior inaccurate and misleading. To address these issues， semiconductor companies have published numerous application notes that basically provide rules that – if followed – will result in a successful design. This article will address basic considerations; knowing a few basics is essential to get a design started in the right direction.