时钟芯片RX8025T

RX-8801SAContents1.Overview..................................................................................................................12.BlockDiagram.......................................................................................................13.Terminaldescription............................................................................................23.1.Terminalconnections..............................................................................................................23.2.PinFunctions.............................................................................................................................24.AbsoluteMaximumRatings..............................................................................35.RecommendedOperatingConditions..........................................................36.FrequencyCharacteristics................................................................................37.ElectricalCharacteristics...................................................................................47.1.DCcharacteristics........................................................................................................................47.2.ACCharacteristics...................................................................................................................58.UseMethods..........................................................................................................68.1.OverviewofFunctions............................................................................................................68.2.DescriptionofRegisters.........................................................................................................78.3.Fixed-cycleTimerInterruptFunction...............................................................................148.4.TimeUpdateInterruptFunction.........................................................................................178.5.AlarmInterruptFunction......................................................................................................198.6.Reading/WritingDataviatheI2CBusInterface...........................................................228.7.BackupandRecovery...........................................................................................................268.8.ConnectionwithTypicalMicrocontroller.........................................................................269.ExternalDimensions/MarkingLayout.......................................................279.1.Externaldimensions..............................................................................................................279.2.Markinglayout.........................................................................................................................2710.Applicationnotes..............................................................................................2810.1.Notesonhandling................................................................................................................2810.2.Notesonpackaging............................................................................................................28RX−−−−8801SApreliminaryPage-1PE02I2C-BusInterfaceReal-timeClockModuleRX−−−−8801SAPreliminary•Featuresbuilt-in32.768kHzDTCXO,HighStability.•SupportsI2C-Bus'shighspeedmode(400kHz)•Alarminterruptfunctionforday,date,hour,andminutesettings•Fixed-cycletimerinterruptfunction•Timeupdateinterruptfunction(Seconds,minutes)•32.768kHzoutputwithOEfunction(FOEandFOUTpins)•Autocorrectionofleapyears(from2000to2099)•Wideinterfacevoltagerange:2.2Vto5.5V•Widetime-keepingvoltagerange:1.8Vto5.5V•Lowcurrentconsumption:0.8µA/3V(Typ.)TheI2C-BUSisatrademarkofNXPSemiconductors.1.OverviewThismoduleisanI2Cbusinterface-compliantreal-timeclockwhichincludesa32.768kHzDTCXO.Inadditiontoprovidingacalendar(year,month,date,day,hour,minute,second)functionandaclockcounterfunction,thismoduleprovidesanabundanceofotherfunctionsincludinganalarmfunction,fixed-cycletimerfunction,timeupdateinterruptfunction,and32.768kHzoutputfunction.ThedevicesinthismodulearefabricatedviaaC-MOSprocessforlowcurrentconsumption,whichenableslong-termbatteryback-up.AllofthesemanyfunctionsareimplementedinaSOPpackage.2.BlockDiagram32kHzDTCXO32.768kHzCLOCKandCALENDARTIMERREGISTERALARMREGISTERFOUTCONTROLLERCONTROLREGISTERandSYSTEMCONTROLLERDIVIDERINTERRUPTCONTROLLERI2C-BUSINTERFACECIRCUITFOUTFOE/INTSCLSDARX−−−−8801SApreliminaryPage-2PE023.Terminaldescription3.1.TerminalconnectionsRX−8801SA1.T1(CE)14.N.C.2.SCL13.SDA3.FOUT12.T2(VPP)4.N.C.11.GND5.TEST10./INT6.VDD9.N.C.7.FOE8.N.C.SOP−14pin3.2.PinFunctionsSignalnameI/OFunctionT1(CE)Input*Usebythemanufacturefortesting.(Donotconnectexternally.)SCLInputThisistheserialclockinputpinforI2CBuscommunications.FOUTOutputThisistheC-MOSoutputpinwithoutputcontrolprovidedviatheFOEpin.WhenFOE=H(highlevel),thispinoutputsa32.768kHzsignal.Whenoutputisstopped,theFOUTpin=Hi-Z(highimpedance).TESTInput*Usebythemanufacturefortes