Thresholdcss
csshack 时间:2021-02-11 阅读:()
CustomSiliconSolutions,Inc.
20081Version1.
0,October2008cssCustomSiliconSolutions,Inc.
CSS555(C)MicropowerTimer(EEPROMSerialInterface)OverviewTheCSS555andCSS555CIC'sincludeaninternalmemorytostoreconfigurationandtrimdata.
Thedataisstoredinanon-volatilememory(EEPROM)sothattheinformationisheldevenwhenthedeviceisnotpowered.
Afour-wireserialinterfaceprovidesRead/WriteaccesstotheEEPROM.
Tomaintainthestandardnumberof555pins,fourpinshavesecondaryfunctions.
Thealternatefunctionshavebeendefinedsotheydonotinterferewithnormaltimeroperation.
TheEEPROMincludesaninternalprogramvoltagegeneratorsonoexternalhighvoltagesignalsarerequiredtostorenewdata.
ThememoryaccessmodeisinitiatedbyforcingtheCONTROLpintoGND.
Aftertheaccessmodeisenabled,theTRIGGER,RESETandOUTPUTpinsprovidetheSerialClock,DataInandDataOutfunctionsrespectively.
Theyareusedtoentercommands,selectanaddressandinput/outputdata.
Eachaccesscycleconsistsofaneight-bitcontrolbytefollowedbyeightbitsofinput(oroutput)data.
Adetaileddescriptionofthepinfunctions,commands,bitassignmentsandsignaltimingisprovidedinthefollowingfiguresandtables.
Ablockdiagramoftheinterfacecircuitisshownbelow.
(seeFigure1)TheEEPROMdatacanbeprogrammedeitherbeforeorafterthedeviceisinstalledintothesystem.
Ifprogrammingisdoneafterinstallation,asimpleinterfaceportcanbeaddedtothePCBtoallowaccesstotheserialinterfacepins.
SeveralexamplesareshowninFigures7-9.
BlockDiagramSerialInterfaceCircuitFigure1CustomSiliconSolutionsInc.
17951SkyParkCircle,SuiteFIrvine,CA92614(949)797-9220FAX:(949)797-9225www.
CustomSiliconSolutions.
comControlVoltageReset54Trigger2DIN_EnblOutputDischarge37In0In1OutSel2:1MuxApplicationNoteAN555-144DOUTDataInRegisterEnblDINClkCMDADDCommand&AddressRegisterEnblDINClkCA_EnblCA_EnblDIN_EnblCapacitorTrimEEPROM555ConlyEEOUTCT100pF86Threshold8ConfigurationEEPROMControlEEOUTDOUTDIN3555Timer&DecadeCounterConfigInTimerOutDischgReadEEPROM6TrigControlThreshReset555ConlySerialClockSerialDataInEnableEEAccessVsw~0.
75VClkSequenceControllerResetEEAddReadStoreCA_EnblDIN_EnblCMDADDCSS555ICfromAnalogInputPinsCustomSiliconSolutions,Inc.
20082Version1.
0,October2008CSS555MicropowerTimer(EEPROMSerialInterface)SerialInterfaceDescriptionFourpinshavedualfunctionstoprovideReadandWriteaccesstotheEEPROM.
TheCONTROLpinisusedtoenabletheEEPROMprogrammingmode.
ThevoltageattheCONTROLpin(VCONTROL)isnormallysettoVDDbyaninternalresistivedivider.
IfVCONTROLisheldbelow0.
5V,theprogrammingmodeisenabled.
Whentheprogrammingmodeisactive,threeadditionalpinfunctionsaremodifiedtoprovidethe"SerialClock","SerialDataIn"and"SerialDataOut"functions.
ThespecialpinfunctionsforaccessingtheEEPROMarelistedinTable1.
PinFunctionPinNumberPinNamePrimaryorTimerModeSecondaryorEEPROMProgramMode1VSSGNDGND2TRIGGERStartTimerSerialClock3OUTPUTTimerOutputPulseSerialDataOut4RESETStopTimerSerialDataIn5CONTROLUpperTripLevel(VDD)ProgramEnable6THRESHOLDUpperComparatorInput7DISCHARGECTDischargeFET8VDDPositiveSupplyPositiveSupplyTable1Intheprogrammingmode,theserialclockisprovidedbytheTRIGGERpin.
TheRESETpinbecomes"SerialDataIn"and"SerialDataOut"isprovidedbytheOUTPUTpin.
Inthenormaltimingmode,theTRIGGERinputisconnectedtotheinvertinginputofthelowercomparatoranditsswitchlevelis(VCONTROL).
Intheprogrammingmode,theTRIGGERinputdrivesastandardCMOSdigitalinput.
Itsswitchlevelisapproximately(VDD).
AllaccesscyclesstartbyforcingtheCONTROLpinlowandshiftinginaneight-bitcontrolbyte.
(seeFigures2and3)Thecontrolbytecontainsafour-bitcommandandafour-bitaddress.
ThecommandportionisusedtospecifyeitheraReadorWritecycle.
Theaddressportionselectsthelocationtobeaccessed.
AsummaryoftheinterfacecommandsisprovidedinTable2.
IfaReadcommandisentered,thenexteightclocksshiftthecontentsoftheselectedaddressontotheOUTPUTpin.
(ConfigurationbitassignmentsareshowninTable3.
Capacitortrimbits(CSS555Conly)areenteredLSBtoMSB.
)IfaWritecommandisentered,newdataisloadedduringthenexteightclocksanditisprogrammedintotheEEPROMduringthe9thclockpulse.
TheaccesscycleisterminatedwhentheCONTROLpinisreleased.
(TheinternaldividerwillpullituptoVDDandthenormaltimermodewillbere-established.
)InterfaceCommands(ControlByte)ControlControlByteMSBLSBModeDescriptionPinAddressCommandNormal555Timingmode>1.
0VxxxxxxxxReadEE1ReadConfigurationDataCSS555ConlyTable2ConfigurationBits(DataByte)CounterConfigurationMSBLSBCounterSetting(Multiplier)ModeControlMSBLSBFunctionxxxxx0001(Std.
555)xxxx0xxxAstableMode("Don'tCare"ifStd.
555)xxxxx00110xxxx1xxxMonostableMode("Don'tCare"ifStd.
555)xxxxx010100xxx0xxxxMicroPowerxxxxx0111Kxxx1xxxxLowPowerxxxxx10010Kxx0xxxxxStandardVoltage(Triplevels=&VDD)xxxxx101100Kxx1xxxxxLowVoltage(Triplevels=10%&90%VDD)xxxxx1101MBit6Unusedxxxxx1111(Std.
555)Bit70if555,1if555C(Readonly)Table3AN555-2CustomSiliconSolutions,Inc.
20083Version1.
0,October2008CSS555MicropowerTimer(EEPROMSerialInterface)TimingDiagramsReadEEPROM(1Byte)Figure2ProgramEEPROM(1Byte)Figure3ProgramByte1,Data=2B(hex),ReadByte1Figure4AN555-2Control=12hexDataIn=2BhexEnterData&ProgramByte110ADDCMDXXCounterOutCounterOutPROGENControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPinEEREADInternalSignalEESTOREInternalSignalStoreVPP(~20V)InternalSignalStore~10ms00100011110000LoadData&ProgramReadDataLSBLSBDATAINLSB01ADDCMD00100011110000LSBLSBDATAOUTLSBControl=11hexDataOut=2BhexXCounterOutReadByte1XEnterCommand&AddressReadEEDataReadEE(ConfigurationorCapTrimByte)C2C3A0A1A2C1C0A3XXED2ED3ED4ED5ED6ED1ED0ED7CounterOutputCounterOutputPROGENControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPinEEADDRInternalBussEEREADInternalSignalEA2EA3EA4EA5EA6EA1EA0EA7XControlByteDataByteEnterCommand&AddressEnterNewEEDataEnterNewEEData&Program1ByteCounterOutputCounterOutputPROGENControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPinEEADDRInternalBussEESTOREInternalSignalStoreVPP(~20V)InternalSignalStore~10msC2C3A0A1A2C1C0A3XXED2ED3ED4ED5ED6ED1ED0ED7EA2EA3EA4EA5EA6EA1EA0EA7XControlByteDataByteCustomSiliconSolutions,Inc.
20084Version1.
0,October2008CSS555MicropowerTimer(EEPROMSerialInterface)SerialInterfaceTimingSpecificationsVDD=1.
5Vto5.
5V,Temperature=-40°Cto+85°CParameterSymbolConditionsMinTypMaxUnitsSerialClockPeriodtCLKP50%dutycycle500200nsSerialClockHighTimetCLKHRisingtofallingedge250100nsSerialClockLowTimetCLKLFallingtorisingedge250100nsSerialClockRise/FallTimestR,tF20%to80%,80%to20%100nsDataInSetupTimetDSUDatavalidtorisingclockedge5025nsDataInHoldTimetDHDFallingclockedgetodatainvalid5025nsModeLeadTimetMLDControlpinlowtofirstclockedge1000500nsDataOutputDelayTimetDODRisingclockedgetoDataOutvalid50100nsEEPROMStoreTimetSTRClocklowtime(17thpulse)2510100millisecNote1:Typicalvaluesareforoperationat3V,25°CNote2:DataOutputDelayTime(tDOD)measuredwithCLOAD=10pFandRLOAD=1M.
Table4SerialInterfaceTimingDiagramReadModeFigure5ProgramModeFigure6AN555-2EnterCommand&Address(8clockcycles)ReadEEData(8clockcycles)CMD0tMLDEEMODEControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPintDSUtDHDtCLKLtCLKHCMD1tCLKPDOUT0DOUT1DOUT2TimerOutTimerOuttDODExitEEModeEnterCommand,Address&Data(16clockcycles)Store1ByteintoEEPROM(17thclockpulse)CMD0tMLDEEMODEControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPintDSUtDHDtCLKLtCLKHCMD1tSTRTimerOutTimerOutExitEEModeCustomSiliconSolutions,Inc.
20085Version1.
0,October2008CSS555CMicropowerTimer(EEPROMSerialInterface)SerialInterfaceExamplesTheCSS555'sserialinterfaceisverystraightforwardandrequiresminimalextracomponentstoimplement.
Itconsistsofthreedigitalinputsignalsthatprovidecontrol,clockanddatainputfunctionsandasingledigitaloutputthatallowsdatatobereadbackfromthedevice.
ThehardwareneededtoprogramtheEEPROMdependsonwhethertheICis"loose"orhasbeeninstalledinasystem.
ExamplesforbothconditionsareshowninFigures7,8and9.
ProgrammingBeforeInstallationThecircuitinFigure7showsadiagramforaninterfaceschematicbetweenanATE(AutomaticTestEquipment)andanuninstalledor"loose"IC.
ThisexampleallowsdatatobewrittentoandreadfromtheinternalEEPROM.
Noexternalcomponentsarerequiredforthisprogrammingsetup.
(ThetimingcomponentsRA,RBandChavebeenomitted.
)Figure7Program&ReadEEPROMOnlyIfthetimerfunctionalsoneedstobetested,thecircuitinFigure8showsaninterfacecircuitthatsupportstheRead,WriteandTimeroperatingmodes.
ThetimingcomponentsRA,RBandChavebeenadded.
TheoutputdriverthatprovidestheVCONTROLsignalhasbeenchangedtoathree-stateoutputbuffer.
ThenormaltimermodeisenabledwhentheVCONTROLbufferisdisabled(OE=0).
ThisallowstheICtosetthevoltagelevelattheCONTROLpin,whichisaboutVDD.
AtimercycleisstartedbypulsingSCLK(Trigger)low.
(Reset/DataInmustbeheldhigh.
)Figure8Program,ReadandTimerFunctionsProgrammingAfterInstallationIftheCSS555hasbeeninstalledintoasystem,thechangesrequiredtoimplementtheserialinterfacearestillrelativelyminor.
AnexampleofoneapproachisshowninFigure9.
TestpointsTP1-TP4havebeenaddedtoprovideaccesstotheTRIGGER,RESET,CONTROLandOUTPUTpins.
Ifthree-statebuffersareusedtogeneratethetestsignals,thedevicecanstillbeoperatedinthetimermode.
Inadditiontothetestport,resistorsR1andR2havebeenaddedtoallowtheexternalATEor"Programmer"tocontroltheTRIGGERandRESETsignals.
SincethesepinsarehighimpedanceCMOSinputs,theadditionalseriesresistancewillnotaffecttheiroperationorincreasetheoperatingcurrentofthecircuit.
Avaluebetween10Kto100KissuggestedforR1andR2.
Figure9ProgramandRead"IntheSystem"+VSCLKDataInDataOutVDDDischgThreshControlCSS555VSSTriggerOutputResetVCONTROLGNDProgramEnableNCNCA.
T.
E.
+VSCLKDataInDataOutVDDDischgThreshControlCSS555VSSTriggerOutputResetVCONTROLGNDProgramEnableA.
T.
E.
RACRBOETrigger+V/ResetTimerOutVDDDischgThreshControlCSS555VSSTriggerOutputResetTestPortSystemPCBRACRBVDDTP1TP2TP3TP4R1R2CustomSiliconSolutions,Inc.
20086Ver.
1.
0–October2008
20081Version1.
0,October2008cssCustomSiliconSolutions,Inc.
CSS555(C)MicropowerTimer(EEPROMSerialInterface)OverviewTheCSS555andCSS555CIC'sincludeaninternalmemorytostoreconfigurationandtrimdata.
Thedataisstoredinanon-volatilememory(EEPROM)sothattheinformationisheldevenwhenthedeviceisnotpowered.
Afour-wireserialinterfaceprovidesRead/WriteaccesstotheEEPROM.
Tomaintainthestandardnumberof555pins,fourpinshavesecondaryfunctions.
Thealternatefunctionshavebeendefinedsotheydonotinterferewithnormaltimeroperation.
TheEEPROMincludesaninternalprogramvoltagegeneratorsonoexternalhighvoltagesignalsarerequiredtostorenewdata.
ThememoryaccessmodeisinitiatedbyforcingtheCONTROLpintoGND.
Aftertheaccessmodeisenabled,theTRIGGER,RESETandOUTPUTpinsprovidetheSerialClock,DataInandDataOutfunctionsrespectively.
Theyareusedtoentercommands,selectanaddressandinput/outputdata.
Eachaccesscycleconsistsofaneight-bitcontrolbytefollowedbyeightbitsofinput(oroutput)data.
Adetaileddescriptionofthepinfunctions,commands,bitassignmentsandsignaltimingisprovidedinthefollowingfiguresandtables.
Ablockdiagramoftheinterfacecircuitisshownbelow.
(seeFigure1)TheEEPROMdatacanbeprogrammedeitherbeforeorafterthedeviceisinstalledintothesystem.
Ifprogrammingisdoneafterinstallation,asimpleinterfaceportcanbeaddedtothePCBtoallowaccesstotheserialinterfacepins.
SeveralexamplesareshowninFigures7-9.
BlockDiagramSerialInterfaceCircuitFigure1CustomSiliconSolutionsInc.
17951SkyParkCircle,SuiteFIrvine,CA92614(949)797-9220FAX:(949)797-9225www.
CustomSiliconSolutions.
comControlVoltageReset54Trigger2DIN_EnblOutputDischarge37In0In1OutSel2:1MuxApplicationNoteAN555-144DOUTDataInRegisterEnblDINClkCMDADDCommand&AddressRegisterEnblDINClkCA_EnblCA_EnblDIN_EnblCapacitorTrimEEPROM555ConlyEEOUTCT100pF86Threshold8ConfigurationEEPROMControlEEOUTDOUTDIN3555Timer&DecadeCounterConfigInTimerOutDischgReadEEPROM6TrigControlThreshReset555ConlySerialClockSerialDataInEnableEEAccessVsw~0.
75VClkSequenceControllerResetEEAddReadStoreCA_EnblDIN_EnblCMDADDCSS555ICfromAnalogInputPinsCustomSiliconSolutions,Inc.
20082Version1.
0,October2008CSS555MicropowerTimer(EEPROMSerialInterface)SerialInterfaceDescriptionFourpinshavedualfunctionstoprovideReadandWriteaccesstotheEEPROM.
TheCONTROLpinisusedtoenabletheEEPROMprogrammingmode.
ThevoltageattheCONTROLpin(VCONTROL)isnormallysettoVDDbyaninternalresistivedivider.
IfVCONTROLisheldbelow0.
5V,theprogrammingmodeisenabled.
Whentheprogrammingmodeisactive,threeadditionalpinfunctionsaremodifiedtoprovidethe"SerialClock","SerialDataIn"and"SerialDataOut"functions.
ThespecialpinfunctionsforaccessingtheEEPROMarelistedinTable1.
PinFunctionPinNumberPinNamePrimaryorTimerModeSecondaryorEEPROMProgramMode1VSSGNDGND2TRIGGERStartTimerSerialClock3OUTPUTTimerOutputPulseSerialDataOut4RESETStopTimerSerialDataIn5CONTROLUpperTripLevel(VDD)ProgramEnable6THRESHOLDUpperComparatorInput7DISCHARGECTDischargeFET8VDDPositiveSupplyPositiveSupplyTable1Intheprogrammingmode,theserialclockisprovidedbytheTRIGGERpin.
TheRESETpinbecomes"SerialDataIn"and"SerialDataOut"isprovidedbytheOUTPUTpin.
Inthenormaltimingmode,theTRIGGERinputisconnectedtotheinvertinginputofthelowercomparatoranditsswitchlevelis(VCONTROL).
Intheprogrammingmode,theTRIGGERinputdrivesastandardCMOSdigitalinput.
Itsswitchlevelisapproximately(VDD).
AllaccesscyclesstartbyforcingtheCONTROLpinlowandshiftinginaneight-bitcontrolbyte.
(seeFigures2and3)Thecontrolbytecontainsafour-bitcommandandafour-bitaddress.
ThecommandportionisusedtospecifyeitheraReadorWritecycle.
Theaddressportionselectsthelocationtobeaccessed.
AsummaryoftheinterfacecommandsisprovidedinTable2.
IfaReadcommandisentered,thenexteightclocksshiftthecontentsoftheselectedaddressontotheOUTPUTpin.
(ConfigurationbitassignmentsareshowninTable3.
Capacitortrimbits(CSS555Conly)areenteredLSBtoMSB.
)IfaWritecommandisentered,newdataisloadedduringthenexteightclocksanditisprogrammedintotheEEPROMduringthe9thclockpulse.
TheaccesscycleisterminatedwhentheCONTROLpinisreleased.
(TheinternaldividerwillpullituptoVDDandthenormaltimermodewillbere-established.
)InterfaceCommands(ControlByte)ControlControlByteMSBLSBModeDescriptionPinAddressCommandNormal555Timingmode>1.
0VxxxxxxxxReadEE1ReadConfigurationDataCSS555ConlyTable2ConfigurationBits(DataByte)CounterConfigurationMSBLSBCounterSetting(Multiplier)ModeControlMSBLSBFunctionxxxxx0001(Std.
555)xxxx0xxxAstableMode("Don'tCare"ifStd.
555)xxxxx00110xxxx1xxxMonostableMode("Don'tCare"ifStd.
555)xxxxx010100xxx0xxxxMicroPowerxxxxx0111Kxxx1xxxxLowPowerxxxxx10010Kxx0xxxxxStandardVoltage(Triplevels=&VDD)xxxxx101100Kxx1xxxxxLowVoltage(Triplevels=10%&90%VDD)xxxxx1101MBit6Unusedxxxxx1111(Std.
555)Bit70if555,1if555C(Readonly)Table3AN555-2CustomSiliconSolutions,Inc.
20083Version1.
0,October2008CSS555MicropowerTimer(EEPROMSerialInterface)TimingDiagramsReadEEPROM(1Byte)Figure2ProgramEEPROM(1Byte)Figure3ProgramByte1,Data=2B(hex),ReadByte1Figure4AN555-2Control=12hexDataIn=2BhexEnterData&ProgramByte110ADDCMDXXCounterOutCounterOutPROGENControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPinEEREADInternalSignalEESTOREInternalSignalStoreVPP(~20V)InternalSignalStore~10ms00100011110000LoadData&ProgramReadDataLSBLSBDATAINLSB01ADDCMD00100011110000LSBLSBDATAOUTLSBControl=11hexDataOut=2BhexXCounterOutReadByte1XEnterCommand&AddressReadEEDataReadEE(ConfigurationorCapTrimByte)C2C3A0A1A2C1C0A3XXED2ED3ED4ED5ED6ED1ED0ED7CounterOutputCounterOutputPROGENControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPinEEADDRInternalBussEEREADInternalSignalEA2EA3EA4EA5EA6EA1EA0EA7XControlByteDataByteEnterCommand&AddressEnterNewEEDataEnterNewEEData&Program1ByteCounterOutputCounterOutputPROGENControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPinEEADDRInternalBussEESTOREInternalSignalStoreVPP(~20V)InternalSignalStore~10msC2C3A0A1A2C1C0A3XXED2ED3ED4ED5ED6ED1ED0ED7EA2EA3EA4EA5EA6EA1EA0EA7XControlByteDataByteCustomSiliconSolutions,Inc.
20084Version1.
0,October2008CSS555MicropowerTimer(EEPROMSerialInterface)SerialInterfaceTimingSpecificationsVDD=1.
5Vto5.
5V,Temperature=-40°Cto+85°CParameterSymbolConditionsMinTypMaxUnitsSerialClockPeriodtCLKP50%dutycycle500200nsSerialClockHighTimetCLKHRisingtofallingedge250100nsSerialClockLowTimetCLKLFallingtorisingedge250100nsSerialClockRise/FallTimestR,tF20%to80%,80%to20%100nsDataInSetupTimetDSUDatavalidtorisingclockedge5025nsDataInHoldTimetDHDFallingclockedgetodatainvalid5025nsModeLeadTimetMLDControlpinlowtofirstclockedge1000500nsDataOutputDelayTimetDODRisingclockedgetoDataOutvalid50100nsEEPROMStoreTimetSTRClocklowtime(17thpulse)2510100millisecNote1:Typicalvaluesareforoperationat3V,25°CNote2:DataOutputDelayTime(tDOD)measuredwithCLOAD=10pFandRLOAD=1M.
Table4SerialInterfaceTimingDiagramReadModeFigure5ProgramModeFigure6AN555-2EnterCommand&Address(8clockcycles)ReadEEData(8clockcycles)CMD0tMLDEEMODEControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPintDSUtDHDtCLKLtCLKHCMD1tCLKPDOUT0DOUT1DOUT2TimerOutTimerOuttDODExitEEModeEnterCommand,Address&Data(16clockcycles)Store1ByteintoEEPROM(17thclockpulse)CMD0tMLDEEMODEControlPinSCLKTriggerPinDATAINResetPinDATAOUTOutputPintDSUtDHDtCLKLtCLKHCMD1tSTRTimerOutTimerOutExitEEModeCustomSiliconSolutions,Inc.
20085Version1.
0,October2008CSS555CMicropowerTimer(EEPROMSerialInterface)SerialInterfaceExamplesTheCSS555'sserialinterfaceisverystraightforwardandrequiresminimalextracomponentstoimplement.
Itconsistsofthreedigitalinputsignalsthatprovidecontrol,clockanddatainputfunctionsandasingledigitaloutputthatallowsdatatobereadbackfromthedevice.
ThehardwareneededtoprogramtheEEPROMdependsonwhethertheICis"loose"orhasbeeninstalledinasystem.
ExamplesforbothconditionsareshowninFigures7,8and9.
ProgrammingBeforeInstallationThecircuitinFigure7showsadiagramforaninterfaceschematicbetweenanATE(AutomaticTestEquipment)andanuninstalledor"loose"IC.
ThisexampleallowsdatatobewrittentoandreadfromtheinternalEEPROM.
Noexternalcomponentsarerequiredforthisprogrammingsetup.
(ThetimingcomponentsRA,RBandChavebeenomitted.
)Figure7Program&ReadEEPROMOnlyIfthetimerfunctionalsoneedstobetested,thecircuitinFigure8showsaninterfacecircuitthatsupportstheRead,WriteandTimeroperatingmodes.
ThetimingcomponentsRA,RBandChavebeenadded.
TheoutputdriverthatprovidestheVCONTROLsignalhasbeenchangedtoathree-stateoutputbuffer.
ThenormaltimermodeisenabledwhentheVCONTROLbufferisdisabled(OE=0).
ThisallowstheICtosetthevoltagelevelattheCONTROLpin,whichisaboutVDD.
AtimercycleisstartedbypulsingSCLK(Trigger)low.
(Reset/DataInmustbeheldhigh.
)Figure8Program,ReadandTimerFunctionsProgrammingAfterInstallationIftheCSS555hasbeeninstalledintoasystem,thechangesrequiredtoimplementtheserialinterfacearestillrelativelyminor.
AnexampleofoneapproachisshowninFigure9.
TestpointsTP1-TP4havebeenaddedtoprovideaccesstotheTRIGGER,RESET,CONTROLandOUTPUTpins.
Ifthree-statebuffersareusedtogeneratethetestsignals,thedevicecanstillbeoperatedinthetimermode.
Inadditiontothetestport,resistorsR1andR2havebeenaddedtoallowtheexternalATEor"Programmer"tocontroltheTRIGGERandRESETsignals.
SincethesepinsarehighimpedanceCMOSinputs,theadditionalseriesresistancewillnotaffecttheiroperationorincreasetheoperatingcurrentofthecircuit.
Avaluebetween10Kto100KissuggestedforR1andR2.
Figure9ProgramandRead"IntheSystem"+VSCLKDataInDataOutVDDDischgThreshControlCSS555VSSTriggerOutputResetVCONTROLGNDProgramEnableNCNCA.
T.
E.
+VSCLKDataInDataOutVDDDischgThreshControlCSS555VSSTriggerOutputResetVCONTROLGNDProgramEnableA.
T.
E.
RACRBOETrigger+V/ResetTimerOutVDDDischgThreshControlCSS555VSSTriggerOutputResetTestPortSystemPCBRACRBVDDTP1TP2TP3TP4R1R2CustomSiliconSolutions,Inc.
20086Ver.
1.
0–October2008
- Thresholdcss相关文档
- 背景IE6、IE7、IE8、Firefox兼容性CSSHACK代码示例
- 浏览器CSShack大全之特殊符号的应用
- 识别CssHack技巧-论浏览器的兼容性
- 浏览器IE6,IE7,IE8,Firefox,Chrome,Safari的CSShack兼容表
- 注释黑马程序员UI教程：CSSHack技术介绍及常用的Hack技巧
- 元素CSShack：针对IE6IE7IE8IE9firefox显示不同效果
古德云香港cn2/美国cn235元/月起， gia云服务器,2核2G,40G系统盘+50G数据盘
古德云(goodkvm)怎么样?古德云是一家成立于2020年的商家，原名(锤子云)，古德云主要出售VPS服务器、独立服务器。古德云主打产品是香港cn2弹性云及美西cn2云服务器，采用的是kvm虚拟化构架，硬盘Raid10。目前，古德云香港沙田cn2机房及美国五星级机房云服务器，2核2G,40G系统盘+50G数据盘,仅35元/月起，性价比较高，可以入手!点击进入：古德云goodkvm官方网站地址古德...
Sharktech：美国/荷兰独立服务器,10Gbps端口/不限流量/免费DDoS防护60G,319美元/月起
sharktech怎么样?sharktech (鲨鱼机房)是一家成立于 2003 年的知名美国老牌主机商，又称鲨鱼机房或者SK 机房，一直主打高防系列产品，提供独立服务器租用业务和 VPS 主机，自营机房在美国洛杉矶、丹佛、芝加哥和荷兰阿姆斯特丹，所有产品均提供 DDoS 防护。此文只整理他们家10Gbps专用服务器，此外该系列所有服务器都受到高达 60Gbps(可升级到 100Gbps)的保护。...
CloudCone（$82/月）15-100M不限流量，洛杉矶CN2 GIA线路服务器
之前分享过很多次CloudCone的信息，主要是VPS主机，其实商家也提供独立服务器租用，同样在洛杉矶MC机房，分为两种线路：普通优化线路及CN2 GIA，今天来分享下商家的CN2 GIA线路独立服务器产品，提供15-100Mbps带宽，不限制流量，可购买额外的DDoS高防IP，最低每月82美元起，支持使用PayPal或者支付宝等付款方式。下面分享几款洛杉矶CN2 GIA线路独立服务器配置信息。配...
csshack为你推荐
工信部域名备案系统 三级域名网站 免费域名解析 com域名抢注 plesk 256m内存 韩国空间 42u标准机柜尺寸 发包服务器 嘟牛 ca4249 200g硬盘 徐正曦 cdn加速原理 百度云1t 安徽双线服务器 创建邮箱 美国盐湖城 摩尔庄园注册 登陆qq空间 更多