基于2总线带有数字温度补偿的实时时钟芯片设计

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1、ABSTRACTABSTRACTTheclockcircuitisanimportantpartofmodernelectronicproducts,itprovidesstableandaccurateclockforthesystem.Withthedevelopmentoftheintegratedcircuits,theclockcircuitisalsobeginningtobeintegrated.However,temperatureaffectstheperformanceofclockIC.Thispaperproposedthedesignofaq

2、uartzcrystalclockchipwithtemperaturecompensationinHHNEC0.25umCMOSprocess.Thispaperdescribedacompletedesignoftheclockchip,whichincludesthestructuredesign,circuitsdesignanddebuggingtest.First,thispaperdeterminedthecoreparametersoftheclockchipaccordingtotherequirementsandgavethedesignofthe

3、chiparchitecture.Second,thispaperintroducedthedesignofRTC,whichincludesaoscillator,abusinterfaceandaclockbasedonregisters.Thispartalsoincludesthelowpressuredetectioncircuit,theoscillationwavedetectioncircuit,PORcircuitandetc.Thenthispapercameintothepartofdigitaltemperaturecompensation.S

4、tartingfromtheanalysesofthetemperaturecharacteristicsofthequartzcrystal,Ideterminedthetemperaturecompensationschemeafterputtingforwardtheconceptoftemperaturecompensation.Thedigitalmethodisusedtostabilizetheoscillationfrequencybychangingtheloadingcapacitanceoftheclock.Thetemperaturecompe

5、nsationcircuitsincludethetemperaturedetectioncircuit,thereferencecircuitandanSARADC.Finally,thisarticlegavethetestresultsofsomechipsamples.What’smore,thedebuggingmethodofthechipsisalsoveryimportant.Asimpleandeffectivemethodofdebuggingwilldeterminethepracticevalueofthechips.Themainreason

6、thataffectsthequalifiedrateliesinthedamageofthequartzcrystal.Althoughthesamplesfailedtomeetbusinessrequirements,butthispaperproposedacompletedesignofthetemperaturecompensatedclockchips.Thesampleshaveaaccuracywithin10PPMandthehighyieldcanbeensuredwithoutconsideringtheeconomicsignificanc

7、e.Keywords:RTC,temperaturecompensation,quartzcrystal,II目录目录第一章绪论....................................................................................................................11.1研究背景与意义.......................................................................................