标签: 桥接遥感

ResistivesensorsconfiguredasWheatstonebridgesareprimarilyusedtosensepressure,temperatureorloads.AnexternalA/Dconverter(ADC)andadigitallyProgrammableGainAmplifier(PGA)caneasilybeusedtoconvertthedifferencevoltagefromtheseresistorbridgesensorstousabledigitalwordsformanipulationbythemicrocontroller.WhenthePGAisusedinthissystem,theotherchannelsoftheMCP6S2XcanbeusedforothersensorswithoutanincreaseinsignalconditioninghardwareorPICmicro®microcontrollerI/Opinconsumption.Themultiplexerandhigh-speedcon-versionresponseofthePGA/Analog-to-Digital(A/D)conversionallowsadifferentialinputsignaltobesam-pledandconvertedintheanalogdomainandthensubtractedinthedigitaldomainwiththemicrocontroller.MAN251BridgeSensingwiththeMCP6S2XPGAsAuthor:BonnieC.BakerBRIDGEDATAACQUISITIONMicrochipTechnologyInc.SYSTEMAnapplicationcircuitforthistypeofsensorenvironmentINTRODUCTIONisshowninFigure1.ResistivesensorsconfiguredasWheatstonebridgesInthiscircuit,thebridgeisexcitedbyavoltagesourceareprimarilyusedtosensepressure,temperatureor(VSEN).Thisreference……