作文拟题技巧专题训练.ppt

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1、2010ITEEmbeddedControllerITE/BillWangIT8518/19Feature2IT8518/19Feature3IT8518/19Feature4ECBlockDiagram5ECFunctioninSystem各個chippoweron的順序PS/2PWMSMBusSMBus6PowerPlan7PowerSavingbyECClockOperationMode8Batteryconnector9GPIO(1)10GPIO(2)11GPIO(3)12GPIO(4)13GPIO(

2、5)14KeyboardMatrix15Crystal-free16MajortopicsPower-onResetCircuitPowerconsumptionAPnote17Power-onResetCircuit(1)BecausetheITEECchiphasbuilt-ina“leveldetection”forpower-onresetcircuit,usermayremovetheexternalresetICfor“WRST#”signalinECdesign.Arecommendedappl

3、icationcircuitforthe“WRST#”signal(pin14)ofECisillustratedasfollowVstbyD1C11uFWRST#R1100Kpin14IT85xx18Powerconsumptiondesignguide(1)EachinputpinshouldbedrivenorpulledInputfloatingcausesleakagecurrentandshouldbeprevented.Pinscanbepulledbyanexternalpullresisto

4、rorinternalpullforapinwithprogrammablepull.19Powerconsumptiondesignguide(2)1.Eachoutput-drainoutputpinshouldbepulledIfanoutput-drainoutputpinisnotusedandisnotpulledbyanexternalpullresistororinternalpullforapinwithprogrammablepull,makeitdrivelowbythefirmware

5、.2.EachinputpinwhichbelongstoVSTBYpowerplaneisconnectedorpulleduptoVCCpowerplaneSuchcasesmaycauseleakagecurrentwhenVCCisnotsuppliedandadiode(lowforwardvoltage)maybeusedtoisolateleakagecurrentfromVSTBYtoVCC.Forexample,usediodesforKBRST#andGA20iftheyareconnec

6、tedtoVCCpowerplaneofSouth-Bridge.Note:SuchasKBRST#,GA20,SCI#…..etc.,useadiodetoconnecttoVCCpowerplane(SouthBridge)toisolateleakagecurrent.Note:NotonlyabovepinsbutalsoallGPIOsarenecessaryforconsideration.Note:MostpinsofIT851xbelongtoVstbypowerplane.20Powerco

7、nsumptiondesignguide(3)ItmaycausealeakagecurrentpathwhenVCCisshutdown.Refertotheaboveconsideration.AnypinwhichbelongstoVSTBYpowerplaneshouldnotbepulledtoVCCinmostcases.21Powerconsumptiondesignguide(4)DisableunnecessarypullforaprogrammablepullpinFlashstandby

8、modePreventaccessingScratchRAMbeforeenteringpower-savingmodeUseDozemoderatherthanIdlemodeUseSleepmoderatherthanDozemodeGateclockbymoduleinECdomainPower-downADC/DACanalogcircuitifitisunnecessary22Applic