只使用一个ADC电容式触摸（CVD）

Thisapplicationnotedescribesanewhardware

sensingmethodcalledCapacitiveVoltageDivider

(CVD)whichusesnoexternalcomponents.Itrequires

onlytheADCtoperformcapacitivetouchsensing.The

principleissimple,andcanbeappliedtonearlyany

MicrochipPIC

®

devicewithanADC.AN1298CapacitiveTouchUsingOnlyanADC(“CVD”)SensingStepsAuthors:ThomasPermeDieterPeterToperformthesensing,dothefollowing:MicrochipTechnologyInc.1.DrivesecondarychanneltoVDDasdigitaloutput.INTRODUCTION2.PointADCtothesecondaryVDDpin(chargesCHOLDtoVDD).Thisapplicationnotedescribesanewhardware