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HT45F5Q Datasheet(PDF) 73 Page - Holtek Semiconductor Inc |
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HT45F5Q Datasheet(HTML) 73 Page - Holtek Semiconductor Inc |
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73 / 114 page  Rev. 1.10 7� De�e��e� 1�� �01� Rev. 1.10 7� De�e��e� 1�� �01� HT45F5Q Charger Flash MCU HT45F5Q Charger Flash MCU Analog to Digital Converter Theneedtointerfacetorealworldanalogsignalsisacommonrequirementformanyelectronic systems.However,toproperlyprocessthesesignalsbyamicrocontroller,theymustfirstbe convertedintodigitalsignalsbyA/Dconverters.ByintegratingtheA/Dconversionelectronic circuitryintothemicrocontroller,theneedforexternalcomponentsisreducedsignificantlywiththe correspondingfollow-onbenefitsoflowercostsandreducedcomponentspacerequirements. A/D Overview Thedevicecontainsamulti-channelanalogtodigitalconverterwhichcandirectlyinterface toexternalanalogsignals,suchasthatfromsensorsorothercontrolsignalsandconvertthese signalsdirectlyintoa12-bitdigitalvalue.Theexternalorinternalanalogsignaltobeconvertedis determinedbytheSAINSandSACSbitfields.Notethatwhentheinternalanalogsignalistobe converted,thepin-sharedcontrolbitsshouldalsobeproperlyconfiguredexcepttheSAINSand SACSbitfields.MoredetailedinformationabouttheA/Dinputsignalisdescribedinthe“A/D ConverterControlRegisters”and“A/DConverterInputSignal”sectionsrespectively. Input Channels A/D Channel Select Bits Input Pins 5+� SAINS�~SAINS0� SACS�~SACS0 AN0~AN� and Vsense VBG� 10×IS TheaccompanyingblockdiagramshowstheoverallinternalstructureoftheA/Dconverter,together withitsassociatedregisters. Pin-sha�ed Sele�tion SACS�~SACS0 SAINS�~SAINS0 A/D Converter START ADBZ ENADC VSS A/D Clo�k ÷�N (N=0~7) fSYS SACKS�~ SACKS0 VDD ENADC SADOL SADOH Vsense AN0 AN� A/D Refe�en�e Voltage A/D Data Registe�s VBG 10×IS ADRFS SAVRS�~ SAVRS0 VREF VDD Pin-sha�ed Sele�tion A/D Converter Structure |
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