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HT45F75 Datasheet(PDF) 101 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 101 Page - Holtek Semiconductor Inc |
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101 / 190 page  Rev. 1.10 100 De�e��e� 1�� �01� Rev. 1.10 101 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Analog to Digital Converter – ADC Theneedtointerfacetorealworldanalogsignalsisacommonrequirementformanyelectronic systems.However,toproperlyprocessthesesignalsbyamicrocontroller,theymustfirstbe convertedintodigitalsignalsbyA/Dconverters.ByintegratingtheA/Dconversionelectronic circuitryintothemicrocontroller,theneedforexternalcomponentsisreducedsignificantlywiththe correspondingfollow-onbenefitsoflowercostsandreducedcomponentspacerequirements. A/D Overview Thisdevicecontainsahighaccuracymulti-channel20-bitdelta-sigmaanalog-to-digital(ΔΣA/D) converterwhichcandirectlyinterfacetoexternalanalogsignals,suchasthatfromsensorsorother controlsignalsandconvertthesesignalsdirectlyintoa20-bitdigitalvalue.Inaddition,thePGA gaincontrol,ADCgaincontrolandADCreferencegaincontroldeterminetheamplificationgainfor ADCinputsignal.Thedesignercanselectthebestgaincombinationforthedesiredamplification appliedtotheinputsignal.ThefollowingblockdiagramillustratestheADCbasicoperational function.TheADCinputchannelcanbearrangedastwodifferentialinputchannels.Theinput signalcanbeamplifiedbyPGAbeforeenteringthe20-bitdelta-sigmaADC.TheΔΣADCmodulator willoutputonebitconverteddatatoSINCfilterwhichcantransformtheconvertedone-bitdata to20bitsandstorethemintothespecificdataregisters.Additionally,thisdevicealsoprovidesa temperaturesensortocompensatetheA/Dconverterdeviationcausedbythetemperature.Withhigh accuracyandperformance,thisdeviceisverysuitableforScalerelatedproducts. VDD/5 VCM AN0 AN� VTSO+ RFC CHSP[�:0] AN1 AN3 VTSO- CHSN[�:0] PGS=x1�x��x��x8�x1 ��x3��x���x1�8 IN1 IN� INIS DI- DI+ REFP REFN VGS= x1� x1/�� x1/� AGS= x1� x�� x�� x8 �0-�it ADC VCM DCSET[�:0] SINC Filte� ADOR[�:0] ADRST Buffe� VRP VRN 01 VCM VREFP 01 AVSS VREFN VREFS VCM 000 001 101 110 111 000 001 101 110 111 VRBUFP VRBUFN A/D Converter Structure |
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