PIC16C781检测空气流量
ProgrammableSwitchModeControllers(PSMC)are
notjustforswitchingpowersupplies.Thistechnical
briefdescribeshowtousethePIC16C781PSMCin
combinationwiththeIntegratedOperationalAmplifier,
Digital-to-AnalogConverter(DAC),andgatedtimerto
constructathermallyoperatedairflowsensorwithmin-
imumexternalcomponents.TB044SensingAirFlowwiththePIC16C781R7isheatedbyR6.IfmovingaircoolsR6,theamountAuthor:WardBrownofheattransferredtoR7isreduced.TheresistanceofMicrochipTechnologyInc.R7fallswiththetemperature.AsR7resistancefalls,thevoltagedropacrossR7alsofalls.TheOpAmpout-putisdirectlyproportionaltothevoltageacrossR7.INTRODUCTIONWhentheOpAmpou
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