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HT45F2002 Datasheet(PDF) 15 Page - Holtek Semiconductor Inc |
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HT45F2002 Datasheet(HTML) 15 Page - Holtek Semiconductor Inc |
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15 / 31 page  Rev. 1.00 1� ���� 1�� �01� Rev. 1.00 15 ���� 1�� �01� HT45F2002 2-Wire Communication Flash MCU HT45F2002 2-Wire Communication Flash MCU Multi-chip Hardware Considerations Asthesingle-package-multi-chipdeviceiscomposedofanindividualMCUandthepowerlinedata transceiverchip,usingthemtogetherrequirestheusertotakecareofsomespecialpoints. Absolute Maximum Rating TheAbsoluteMaximumRatingsforthetwoindividualchipsmustbecheckedfordiscrepanciesand thenecessarycaretakenindevicehandlingandusage. Power Supply and Consumption ExaminationoftheblockdiagramwillrevealthatthepowerlinedatatransceiverchipGroundpin, VSS,hasinternalconnectiontotheMCUGroundpin,VSS.Forthisreasonthesetwopinsdonot needtobeconnectedexternally.Thesingle-package-multi-chipdeviceLDOpinisthepowerline datatransceiverchipLDOoutputpin,VDD,whilethesingle-package-multi-chipdeviceVDDpinis theMCUpowersupplyVDDpin. Tocalculatethepowerconsumptionforthedevice,thetotaloperatingcurrentisthesumofthe operatingcurrentfortheMCUspecifiedintheMCUdatasheetandtheoperatingcurrentforthe powerlinedatatransceiverchiplistedinitsdatasheet.Similarly,thestandbycurrentisthesumof thetwoindividualchipstandbycurrents. Power Down and Wake up TheMCUpower-downandwake-upfunctionsarecoveredintherelevantMCUdatasheet.However, thepowerlinedatatransceiverchipisalwaysoperatingafterapower-up.Therefore,nopower-down issueforthepowerlinedatatransceiverchipiscontrolledbytherelevantMCUdevice. Unbonded MCU Pins ExaminationoftherelevantMCUdatasheetwillrevealthatnotalloftheMCUI/Oportlinesare bondedouttoexternalpins.Asaresultspecialattentionregardinginitialisationproceduresshould bepaidtotheseportlines.Usersshouldensurethatthesepinsaresetupininputstateswithpullhigh resistorsorinoutputstateswitheitherahighorlowlevelstoavoidadditionalpowerconsumption resultingfromfloatinginputpins. Multi-chip Programming Considerations Tousethepowerlinedatatransceiverfunction,severalimportantstepsmustbeimplementedto ensurethatthepowerlinedatatransceiverchipoperatesnormally: TheMCUpowerline,VSS,isinternallyconnectedtothepowerlinedatatransceiverVSSpin.For thisreason,thesetwopinsnoneedtobeconnectedexternally. OthercorrespondingprogrammingconsiderationsmaybecoveredintheMCUandpowerlinedata transceiverdatasheetsrespectively.Refertoallinformationintheindividualdatasheetfordesired applications. |
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