電容觸摸測(cè)試MCU的靈活性

　　電容式觸控技術(shù)廣泛應(yīng)用于從智能手機(jī)到冰箱和汽車的電子產(chǎn)品。在許多應(yīng)用中，電容式觸摸傳感器提供輸入到一個(gè)專用的控制器芯片。MCU直接參與當(dāng)控制器集成為一個(gè)外圍單片機(jī)上死去。

　　無(wú)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(lái)在一個(gè)專用的設(shè)備，MCU必須處理的電容觸摸輸入產(chǎn)生的一些問(wèn)題，以達(dá)到滿意的用戶體驗(yàn)。這些措施包括延遲（及時(shí)響應(yīng)用戶），精度和能源消耗。能源消耗在電池供電設(shè)備中尤為重要。

　　MCU供應(yīng)商提供各種各樣的電容式觸摸解決方案，從專門的外設(shè)到超低功耗接口與電容式觸摸傳感器的電池供電的應(yīng)用。在審查解決方案，但是，電容式觸摸技術(shù)的快速回顧應(yīng)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 “l(fā)umped 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.