数字电流表外文翻译适用docWord文档格式.docx
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数字电流表外文翻译适用docWord文档格式.docx
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系别:
自动化学院
专业:
自动化
班级:
自动0801班
学生姓名:
洪德祥
导师姓名:
杨春杰职称:
讲师
起止时间:
2012年3月8日至2012年6月20日
西安邮电大学本科毕业论文
digitalvoltagemeterBasedonsingle-chiptechnology
Singlechipisanintegratedonasinglechipacompletecomputersystem.Eventhoughmostofhisfeaturesinasmallchip,butithasaneedtocompletethemajorityofcomputercomponents:
CPU,memory,internalandexternalbussystem,mostwillhavetheCore.Atthesametime,suchasintegratedcommunicationinterfaces,timers,real-timeclockandotherperipheralequipment.Andnowthemostpowerfulsingle-chipmicrocomputersystemcanevenvoice,image,networking,inputandoutputcomplexsystemintegrationonasinglechip.Alsoknownassingle-chipmicroprocessor,firstbecauseitwasusedinthefieldofindustrialcontrol.Onlybythesingle-chipCPUchipdevelopedfromthededicatedprocessor.ThedesignconceptisthefirstbyalargenumberofperipheralsandCPUinasinglechip,thecomputersystemsothatsmaller,moreeasilyintegratedintothecomplexanddemandingonthevolumecontroldevices.INTELtheZ80isoneofthefirstdesigninaccordancewiththeideaoftheprocessor,Fromthenon,theMCUandthedevelopmentofadedicatedprocessorpartedways.Atpresent,single-chiptoinfiltrateallareasofourlives,whichisverydifficulttofindtheareaofalmostnotracesofsingle-chipmicrocomputer.Missilenavigationequipment,aircraftcontrolonavarietyofinstruments,computernetworkcommunicationsanddatatransmission,industrialautomation,real-timeprocesscontrolanddataprocessing,arewidelyusedinavarietyofsmartICcard,limousineciviliansecuritysystems,videorecorders,cameras,thecontrolofautomaticwashingmachines,aswellasprogram-controlledtoys,electronicpet,etc.,whichareinseparablefromthesingle-chipmicrocomputer.Nottomentionthefieldofrobotautomation,intelligentinstrumentation,medicalequipmenthasbeen.Throughoutthedevelopmentprocessofsingle-chip,youcanindicatethedevelopmenttrendofsingle-chip,generallyare:
1.Oflow-powerCMOSMCS-51seriesof8031introducedthepowerconsumptionof630mW,andnowwidespreadinthesingle-chip100mWorso,withthegrowingdemandforlow-powersingle-chip,andnowallthebasicsingle-chipmanufacturersareuseofCMOS(complementarymetaloxidesemiconductorprocess).Asthe80C51ontheuseofHMOS(highdensitymetaloxidesemiconductorprocess)andCHMOS(high-densitycomplementarymetaloxidesemiconductorprocess).AlthoughtheCMOSlowpower
consumption,butbecauseofitsphysicalcharacteristicstodetermineitsspeedisnothighenough,andthenCHMOSwithhigh-speedandlowpowerconsumptioncharacteristicsofthesefeatures,itismoresuitableinlowpowerconsumption,asbattery-poweredapplications.Therefore,theprocessforsometimetocomewillbethemainwaytodevelopsingle-chipmicrocomputer.2.Singal-chipofmicro-chipNowgenerallyinconventionalsingle-chipwillbethecentralprocessingunit(CPU),randomaccessdatastorage(RAM),read-onlyprogrammemory(ROM),parallelandserialcommunicationinterface,systeminterruption,timingcircuits,integratedcircuitclockinasinglechip,enhancedsingle-chipintegration,suchasA/Dconverter,PMW(pulsewidthmodulationcircuit),WDT(watchdog),andsomewillbesingle-chipLCD(LCD)driverintegratedcircuitsareinasinglechip,thisunitincludessingle-chipcircuitsonmoreandmorepowerfulfeatures.Evensingle-chipmanufacturerscanalsobetailoredinaccordancewiththerequirementsofusers,tocreateasinglechipwithitsownchipcharacteristics.3.Mainstreamandmulti-speciescoexistenceAlthoughawidevarietyofsingle-chip,unique,butstillsingle-chipmicrocomputer80C51prevailingatthecore,compatiblewithitsstructureandcommandsystemofPHILIPSproducts,ATMELcompany'
sproductsandChinaTaiwan'
s
WinbondSeriessingle-chipmachine.Therefore,single-chipmicrocomputerasthecoreC8051occupiedthehalf.Microchip'
sPICandreducedinstructionset(RISC)hasastrongdevelopmentmomentumofChinaTaiwanHOLTEKsingle-chipcompaniesinrecentyears,increasingproduction,withitshighqualitylow-costadvantages,tooccupyacertainmarketshare.MOTOROLAadditiontothecompany'
sproducts,severallargecompaniesinJapan'
sexclusivesingle-chipmicrocomputer.Acertainperiodoftime,thissituationwillcontinuetobeupheld,therewillnotbeasingle-chipmonopolydomination,takingthecomplementaryinterdependence,complementarityandcommondevelopment.AT89C51isaflickerwith4KbytesEEPROM-programmablelow-voltage,high-performancedigitalmicroprocessorsCMOS8,commonlyknownassingle-chipmicrocomputer.AT89C2051isaflickerwith2KbytesEEPROMprogrammablemicrocontroller.MCUEEPROMerasurecanberepeated100times.ThedeviceATMELmanufacturehigh-densitynonvolatilememorytechnologywithindustry-standardMCS-51instructionsetandpincompatibleoutput.Owingtothemulti-purpose8-bitCPUandflashmemorychipsinasingleportfolio,ATMEL'
s
AT89C51microcontrollerisahighlyefficient,AT89C2051isastreamlinedversionofit.AT89Csingle-chipembeddedcontrolsystemformanyprovidesaflexibleandinexpensiveprogram.AT89C51performance:
1.AndMCS-51compatible2.4KbytesofprogrammableFlashMemory3.Lifeexpectancy:
1000write/wipecycle4.Dataretentiontime:
10years5.Staticworkofthewhole:
0Hz-24MHz6.Three-levelProgramMemoryLock7.128×
8-bitinternalRAM8.32ProgrammableI/Olines9.Two16-bittimer/counter10.5InterruptSources11.ProgrammableSerialChannel12.Low-poweridleandpower-downmode13.ChiposcillatorandclockcircuitryReferredtoasdigitalvoltagemeterDVM,itisadigitalmeasurementtechnology,thecontinuousanalog(DCinputvoltage)intoanon-continuous,discretedigitalformandtheinstrumentdisplay.Thecharacteristicsofdigitalvoltagemeter:
1.Showaclearintuitive,accuratereadingsTraditionalanalogueinstrumentsthroughtheuseofindicatorsmustbecarriedoutanddialreadingsinthereadingprocesswillbeintroducedtotheinevitablehumanerror.Digitalvoltagemeteristheuseofadvanceddigitaldisplaytechnology,sothatthemeasurementresultsataglance,aslongasthemeterjumpphenomenondoesnotoccur,themeasurementresultsisunique.2.ShowthatthemedianShowthatthemedianisusually31/2,32/3,33/4/spaces,41/2,43/4,51/2,61/2,71/2,81/2Atotalof9.Determinethemediannumberofinstrumentstherearetwoprinciples:
1.candisplayallthenumbers0to9aretheinteger-bit;
Score-bitnumericalvalueisbasedonthelargestshowthehighestnumberofelements,withthehighestnumberoffull-scaleasthedenominator.3.Highaccuracy
Accuracyofresultsisameasureofsystematicerrorandrandomerroroftheintegrated.4.HighresolutionDigitalvoltagemeteratthelowestvoltagerangeonthebottomofacharacterrepresentedbythevoltagevalue,knownastheinstrumentoftheresolution,whichreflectsthelevelofinstrumentsensitivity.Withthedisplayresolutionincreasesthemedian.Resolutionreferstothesmallestcanbeshowninthefigures(exceptzero)andthelargestpercentageofthenumber.Forexample,31/2DVMofaresolutionof1/1999≈0.05%.Benotedthattheresolutionandaccuracyaretwodifferentconcepts.Fromthemeasurementpointofview,theresolutionis"
true"
indicators(withmeasurementerrorhasnothingtodo),theaccuracyisthe"
real"
target(onbehalfofthesizeofmeasurementerror).5.WidemeasuringrangeDVMgenerallymoremeasurablerange0~1000VDCvoltage,highvoltageprobecanbemeasuredwiththemillion-volt
high-pressure.A/Dconverter[4]isadigitalvoltagemeter,digitalmultimeterandmeasuringsystemthe"
heart."
Atpresent,domesticproductionofA/Dconverterhasreachedhundredsofspeciescanbebroadlydividedintofivemaincategories:
1.monolithicA/Dconverter;
2.DMMdedicatedsingle-chipIC;
3.dedicatedmulti-displaymeterIC;
4.fordigitaltheuseofspecialinstrumentationIC(ASIC);
5.othergeneral-purposeA/Dconverter,thechipcanonlycompleteA/Dconverter,notdirectlywiththenumberofinstruments.DigitalvoltagemeterdigitalmeterisagreatcoreandfoundationofthedigitalvoltagemeterasacontinuousanalogDCvoltagetoadiscreteformofnon-sequentialnumbers,whichisdifferentfromtraditionaldialindicatorreadingstoincreasethewaystoavoiderrorsinreadingandvisualfatigue.Atpresent,thedigitalmultimeterisacorecomponentoftheinternalA/Dconverter,converter,toalargeextentaffecttheaccuracyoftheaccuracyofthedesignofdigitalmultimeter-DigitalVoltageMeterA/DconverterforconvertinganalogsignalsADC0804input,AT89C51controlstheheartofthetransformationandprocessingtheresultsofoperations,thefinaloutputdevicedrivernumberofvoltagesignal.DigitalvoltagemeterdigitalmeterisagreatcoreandfoundationofthedigitalvoltagemeterasacontinuousanalogDCvoltagetoadiscreteformofnon-sequentialnumbers,whichisdifferentfromtraditionaldialindicatorreadingstoincreasethewaystoavoiderrorsinreadingandvisualfatigue.Atpresent,thedigitalmultimeterisacorecomponentofthe
internalA/Dconverter,converter,toalargeextentaffecttheaccuracyoftheaccuracyofthedesignofdigitalmultimeter-DigitalVoltageMeterA/DconverterforconvertinganalogsignalsADC0804input,AT89C51controlstheheartofthetransformationandprocessingtheresultsofoperations,thefinaloutputdevicedrivernumberofvoltagesignal.LEDdisplaycanbecarriedo
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