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HT66F4530 Datasheet(PDF) 121 Page - Holtek Semiconductor Inc |
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HT66F4530 Datasheet(HTML) 121 Page - Holtek Semiconductor Inc |
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121 / 224 page  Rev. 1.00 1�0 De�e��e� �1� �01� Rev. 1.00 1�1 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers Analog to Digital Converter Theneedtointerfacetorealworldanalogsignalsisacommonrequirementformanyelectronic systems.However,toproperlyprocessthesesignalsbyamicrocontroller,theymustfirstbe convertedintodigitalsignalsbyA/Dconverters.ByintegratingtheA/Dconversionelectronic circuitryintothemicrocontroller,theneedforexternalcomponentsisreducedsignificantlywiththe correspondingfollow-onbenefitsoflowercostsandreducedcomponentspacerequirements. A/D Converter Overview Thesedevicescontainamulti-channelanalogtodigitalconverterwhichcandirectlyinterfaceto externalanalogsignals,suchasthatfromsensorsorothercontrolsignalsandconvertthesesignals directlyintoa12-bitdigitalvalue.Italsocanconverttheinternalsignals,thehighperformance bandgapreferencevoltageVBGREF,theSDoperationalamplifier0outputsignalOPA0Oandthe SDoperationalamplifier1outputsignalOPA1O,intoa12-bitdigitalvalue.Theexternalor internalanalogsignaltobeconvertedisdeterminedbytheSAINS2~SAINS0bitstogetherwiththe SACS3~SACS0bits.MoredetailedinformationabouttheA/Dinputsignalisdescribedinthe"A/D ConverterControlRegisters"and"A/DConverterInputSignals"sections. Device External Input Channels Internal Signals Channel Select Bits HT��F4530 5: AN0~AN4 3: VBGREF� OPA0O� OPA1O SAINS�~SAINS0� SACS3~SACS0 HT��F4540 8: AN0~AN7 HT��F4550 8: AN0~AN7 TheaccompanyingblockdiagramshowstheoverallinternalstructureoftheA/Dconverter,together withitsassociatedregisters. Pin-shared Selection SACS3~SACS0 SAINS2~SAINS0 A/D Converter START ADBZ ADCEN AVSS ÷2N (N=0~7) fSYS SACKS2~SACKS0 AVDD AVDD SAVRS1~SAVRS0 ADCEN A/D Reference Voltage A/D Data Registers ADRFS VBGREF GND SADOL SADOH A/D Clock OPA0O OPA1O VREF Pin-shared Selection AN0 AN7 AN1 A/D Converter Structure |
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