PIC16C781检测空气流量

lecture69136 4 0 pdf 2022-10-20 22:10:55

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