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HT45F65 Datasheet(PDF) 141 Page - Holtek Semiconductor Inc |
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HT45F65 Datasheet(HTML) 141 Page - Holtek Semiconductor Inc |
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141 / 231 page  Rev. 1.60 1�0 �ove��e� ��� �01� Rev. 1.60 1�1 �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU Analog to Digital Converter – ADC Theneedtointerfacetorealworldanalogsignalsisacommonrequirementformanyelectronic systems.However,toproperlyprocessthesesignalsbyamicrocontroller,theymustfirstbe convertedintodigitalsignalsbyA/Dconverters.ByintegratingtheA/Dconversionelectronic circuitryintothemicrocontroller,theneedforexternalcomponentsisreducedsignificantlywiththe correspondingfollow-onbenefitsoflowercostsandreducedcomponentspacerequirements. A/D Overview Thedevicescontainamulti-channelanalogtodigitalconverter,channel0~3areforexternalsignal input,channel4~6areforOPA1applicationandchannel7isforOPA2application.Thepositive referencevoltageisselectedbyVRPS[1:0]option,andthenegativereferencevoltageisselectedby VRNS[1:0]. Device Input Channels A/D Channel Select Bits Input Pins HT��F6�/HT��F66/HT��F67 8 ACS�~ACS0 A�0~AN7 TheaccompanyingblockdiagramshowstheoverallinternalstructureoftheA/Dconverter,together withitsassociatedregisters. A/ D Co nv er te r A/ D Re fe re nc e Vo lt ag e A DRL AD RH A/ D Da ta Re gi st er s ST AR T EO CB AD OF F V SS Ba n dga p AD CK 2 ~A DC K0 f SY S A/ D Cl oc k AV DD AD OF F Bi t ¸ 2 N (N =0 ~6 ) AN 0 AN 1 AN 7 AD VR H A/D Converter Structure A/D Converter Data Registers – ADRL, ADRH Thedevice,whichhasaninternal12-bitA/Dconverter,requirestwodataregisters,ahighbyte register,knownasADRH,andalowbyteregister,knownasADRL.Aftertheconversionprocess takesplace,theseregisterscanbedirectlyreadbythemicrocontrollertoobtainthedigitised conversionvalue.Onlythehighbyteregister,ADRH,utilisesitsfull8-bitcontents.Thelow byteregisterutilisesonly4bitofits8-bitcontentsasitcontainsonlythelowestbitsofthe12-bit convertedvalue. Inthefollowingtable,D0~D11istheA/Dconversiondataresultbits. Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ADRL D3 D� D1 D0 — — — — ADRH D11 D10 D9 D8 D7 D6 D� D� A/D Data Registers |
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