在智能手机中使用的按键开关控制器

摘要：本应用笔记介绍和比较两个键扫描在智能手机的关键垫常用的方法。这表明，省去了EMI滤波器使用低EMI方法的好处。估计也与ESD保护二极管的电容负载津贴。

Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>High-SpeedInterconnect>APP4666Keywords:keyswitch,keyscan,switchmatrix,controller,baseband,passive,conventional,powerspectrumdensity,PSD,electromagneticinterference,EMI,debounce,row,column,portMay10,2012APPLICATIONNOTE4666UsingKey-SwitchControllersinSmartphonesBy:WalterChen,PrincipleMemberoftheTechnicalStaff,ApplicationsMay10,2012Abstract:Thisapplicationnotedescribesandcomparestwokey-scanmethodscommonlyusedinsmartphonekeypads.ItshowsthebenefitofeliminatingtheuseofEMIfiltersforthelowEMImethod.Thecapacitiveloadingallowanceassociatedw