CAT1021中文资料

CAT1026,CAT1027©2008SCILLC.Allrightsreserved.1Doc.No.MD-3010Rev.MCharacteristicssubjecttochangewithoutnoticeDualVoltageSupervisoryCircuitswithI2CSerial2k-bitCMOSEEPROMFEATURESPrecisionVCCPowerSupplyVoltageMonitor—5V,3.3Vand3Vsystems—FivethresholdvoltageoptionsAdditionalvoltagemonitoring—Externallyadjustabledownto1.25VWatchdogtimer(CAT1027only)ActiveHighorLowReset—ValidresetguaranteedatVCC=1V400kHzI2CBus2.7Vto5.5VOperationLowpowerCMOStechnology16-BytePageWriteBufferBuilt-ininadvertentwriteprotection1,000,000Program/ErasecyclesManualResetcapability100yeardataretentionIndustrialandextendedtemperatureranges8-pinDIP,SOIC,TSSOP,MSOPorTDFN(3x3mmfoot-print)packages—TDFNmaxheightis0.8mmForOrderingInformationdetails,seepage19.DESCRIPTIONTheCAT1026andCAT1027arecompletememoryandsupervisorysolutionsformicrocontroller-basedsystems.A2k-bitserialEEPROMmemoryandasystempowersupervisorwithbrown-outprotectionareintegratedtogetherinlowpowerCMOStechno–logy.Memoryinterfaceisviaa400kHzI2Cbus.TheCAT1026andCAT1027provideaprecisionVCCsensecircuitwithfiveresetthresholdvoltageoptionsthatsupport5V,3.3Vand3Vsystems.Thepowersupplymonitorandresetcircuitprotectsmemoryandsystemscontrollersduringpowerup/downandagainstbrownoutconditions.Ifpowersupplyvoltagesareoutoftoleranceresetsignalsbecomeactivepreventingthesystemmicrocontroller,ASIC,orperipheralsfromoperating.TheCAT1026featurestwoopendrainresetoutputs:one(RESET)driveshighandtheother(RESET¯¯¯¯¯¯)driveslowwheneverVCCfallsbelowthethreshold.Resetoutputsbecomeinactivetypically200msafterthesupplyvoltageexceedstheresetthresholdvalue.Withbothactivehighandlowresetsignals,interfacetomicrocontrollersandotherICsissimple.CAT1027hasonlyaRESET¯¯¯¯¯¯output.Inaddition,theRESET¯¯¯¯¯¯pincanbeusedasaninputforpush-buttonmanualresetcapability.TheCAT1026andCAT1027provideanauxiliaryvoltagesensorinput,VSENSE,whichisusedtomonitorasecondsystemsupply.Theauxiliaryhighimpe-dancecomparatordrivestheopendrainoutput,VLOW,wheneverthesensevoltageisbelow1.25Vthreshold.TheCAT1027isdesignedwitha1.6secondwatchdogtimercircuitthatresetsasystemtoaknownstateifsoftwareorahardwareglitchhaltsor“hangs”thesystem.TheCAT1027featuresawatchdogtimerinterruptinput,WDI.Theon-chip2k-bitEEPROMmemoryfeaturesa16-bytepage.Inaddition,hardwaredataprotectionisprovidedbyaVCCsensecircuitthatpreventswritestomemorywheneverVCCfallsbelowtheresetthresholdoruntilVCCreachestheresetthresholdduringpowerup.Availablepackagesinclude8-pinDIPandsurfacemount,8-pinSO,8-pinTSSOP,8-pinTDFNand8-pinMSOPpackages.TheTDFNpackagethicknessis0.8mmmaximum.TDFNfootprintis3x3mm.CAT1026,CAT1027Doc.No.MD-3010Rev.M2©2008SCILLC.Allrightsreserved.Characteristicssubjecttochangewithoutnotice2kbitDOUTACKSENSEAMPSSHIFTREGISTERSCONTROLLOGICWORDADDRESSBUFFERSSTART/STOPLOGICEEPROMVCCEXTERNALLOADCOLUMNDECODERSXDECDATAINSTORAGEHIGHVOLTAGE/TIMINGCONTROLVSSSDARESETControllerSTATECOUNTERSSLAVEADDRESSCOMPARATORSSCLRESETRESET(CAT1026)WDI(CAT1027)-+VCCVSENSE-+VREFVLOWVREFAuxiliaryVoltageMonitorVCCMonitorBLOCKDIAGRAMRESETTHRESHOLDOPTIONPartDashNumberMinimumThresholdMaximumThreshold-454.504.75-424.254.50-303.003.15-282.853.00-252.552.70PINCONFIGURATIONDIPPackage(L)SOICPackage(W)TSSOPPackage(Y)MSOPPackage(Z)VLOW18VCCRESET¯¯¯¯¯¯27RESETVSENSE36SCLVSS45SDACAT1026VLOW18VCCRESET¯¯¯¯¯¯27WDIVSENSE36SCLVSS45SDACAT1027(BottomView)TDFNPackage:3mmx3mm0.8mmmaximumheight-(ZD4)VCC81VLOWRESET72RESET¯¯¯¯¯¯SCL6CAT10263VSENSESDA54VSSVCC81VLOWWDI72RESET¯¯¯¯¯¯SCL6CAT10273VSENSESDA54VSSCAT1026,CAT1027©2008SCILLC.Allrightsreserved.3Doc.No.MD-3010Rev.MCharacteristicssubjecttochangewithoutnoticePINDESCRIPTIONRESET/RESET¯¯¯¯¯¯:RESETOUTPUTs(RESETCAT1026Only)TheseareopendrainpinsandRESET¯¯¯¯¯¯canbeusedasamanualresettriggerinput.Byforcingaresetconditiononthepinthedevicewillinitiateandmaintainaresetcondition.TheRESETpinmustbeconnectedthroughapull-downresistor,andtheRESET¯¯¯¯¯¯pinmustbeconnectedthroughapull-upresistor.SDA:SERIALDATAADDRESSThebidirectionalserialdata/addresspinisusedtotransferalldataintoandoutofthedevice.TheSDApinisanopendrainoutputandcanbewire-ORedwithotheropendrainoropencollectoroutputs.SCL:SERIALCLOCKSerialclockinput.VSENSE:AUXILIARYVOLTAGEMONITORINPUTTheVSENSEinputisasecondvoltagemonitorwhichiscomparedagainstCAT1026andCAT1027internalreferencevoltageof1.25Vtypically.Whenevertheinputvoltageislowerthan1.25V,theopendrainVLOWoutputwillbedrivenlow.Anexternalresistordividerisusedtosetthevoltageleveltobesensed.ConnectVSENSEtoVCCifunused.VLOW:AUXILIARYVOLTAGEMONITOROUTPUTThisopendrainoutputgoeslowwhenVSENSEislessthan1.25VandgoeshighwhenVSENSEexceedsthereferencevoltage.WDI(CAT1027Only):WATCHDOGTIMERINTERRUPTWatchdogTimerInterruptInputisusedtoresetthewatchdogtimer.Ifatransitionfromhightoloworlowtohighdoesnotoccurevery1.6seconds,theRESEToutputswillbedrivenactive.PINFUNCTIONPinNameFunctionRESET¯¯¯¯¯¯ActiveLowResetInput/OutputVSSGroundSDASerialData/AddressSCLClockInputRESETActiveHighResetOutput(CAT1026only)VCCPowerSupplyVSENSEAuxiliaryVoltageMonitorInputVLOWAuxiliaryVoltageMonitorOutputWDIWatchdogTimerInterrupt(CAT1027only)OPERAT