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外文翻译--PIC单片机在手机远程控制器中的低功耗设计.doc

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外文翻译--PIC单片机在手机远程控制器中的低功耗设计.doc

PICMicrocontrollerinMobilePhoneRemoteControllerLowPowerDesignAbstractThecombinationoftelephoneremotecontrollerforlowpowerdesigntoexplorethePICsinglechiplowpowerdesignmethodology,andgivethedesignofthecircuitschematic.KeywordsPICSinglechiplowpowerdesigntelephoneremotecontrollerstandbyINTRODUCTION20thcenturysincethe90s,withthecharacteristiclinewidthofintegratedcircuitscontinuetoshrinkandthechipdensityandacorrespondingincreaseinoperatingfrequency,lowerpowerconsumptionhasbecomeasubmicronanddeepsubmicronVLSIdesignofamajorconsiderationinfactors.Theincreaseinpowerwillbringaboutaseriesofquestions,suchasthecircuitparametersdrift,reliabilitydecreasedchippackageincreaseinproductioncosts.Therefore,thesystempowerconsumptionintheentiresystemdesign,especiallyintheuseofbatterypoweredsystem,itisveryimportant.MicrochipInc.PICmicrocontrollerseriesforthedesignofhighperformance,lowpowersinglechipmicrocomputersystemprovidedagoodsolution.ThefollowingfromthelowpowerdesignmethodsandspecificexamplestointroducesinglechiplowpowerapplicationsPIC.OnelowpowerdesignmethodologyTomakethesystemworkinthelowpowerstate,mustbeproperlysetupsinglechipconfigurationandwork.ThefollowingcombinationofthemostcommonlyusedPIC12,PIC16,etc.IntroduceSinglechiplowpowersystemdesign.1.1ThebasicdesignmethodHavemuchtechnologycanreducesystempowerconsumption,themostcommonlyusedareSleepmode.ProceduresfortheenforcementofaSLEEPinstruction,thenenteredadormantSleepmode.ToSleepmode,thecrystaloscillationtostop,atwhichpointsinglechipmicrocomputerinthe3Vpowersupplyconditions,only1μAofcurrent.Systemwork,canbeusedsinglechipwatchdogorexternaleventsperiodicallywakeupsinglechip,theelectronicswitchtoprovidepowerforthesystemtoreducesystemstandbypowerconsumption,extendbatterylife.Singlechipoperatingfrequencyandpowerconsumptionisalsoagreatrelationship,thehigherthefrequency,thegreaterthepowerconsumption.Using32kHzcrystaloscillator,3Vvoltagejob,PIC12,PIC16MCUandothertypicaloperatingcurrentofonly15μAusing4MHzcrystal,5Voperatingvoltage,thetypicalsinglechipcurrentjobtomeetafewmA.Lowpowerconsumptioninmanyoccasions,theuseoflowspeedlowpowercrystaloscillatorimplementationveryeffective.IfusingsinglechipRCoscillation,butalsothroughtheI/Oportoperationtochangetheoscillationresistor,thuschangingthesinglechipoperatingfrequency,toachievethepurposeofenergysaving.AsshowninFigure1,anI/OpinscanbeinthewaitstatewillberemovedparallelresistorR1toreducethesinglechipoperatingfrequency.WhenSinglechipnecessaryworkcanbeI/Opinissettooutputandoutputhigh,therebyenhancingtheoscillationfrequency.1.2OscillationCircuitDesignInsinglechipsystemdesign,theoscillatorcircuitisdesignedtobeaveryimportantaspect.PICMCUtypicaloscillationcircuitshowninFigure2.Undernormalcircumstances,thedesignstaffinaccordancewiththemanufacturersgiveachoiceoftheparametertable.Ifthesystemcanworkproperly,itwillnolongerbeimproved.Infact,thisisnotappropriate.SinceMicrochipmicrocontrolleraccordingtothemodelandversionofthedifferentjobintheDCvoltagerangeof2.55.5V,theautomotivegradetemperaturecanbeintherangeof40125℃,andtheparametersofthetablegiveonlyalimitednumberkindsofsituations,theactualenvironmentalparametersontheperformanceofoscillatorcircuithaveahugeimpact.Suchashightemperature,lowvoltagecanreducetheoscillationloopgain,whiletheoscillationfrequencyfromthelowerormoredifficulttostartlowtemperature,highvoltageloopgaincanbecomelarger,sothatcrystaloffdrive,resultinginthepotentialriskofdamageoroscillationcircuitTheincreasedfrequencyofhighharmonics,andincreasesystempowerconsumption.Therefore,howtocorrecttheoscillatorcircuitdesignsystemisnecessary.ForPICMCU,thegeneraldesignstepsareasfollows①Selectcrystal.Accordingtothesystemsoscillationfrequencyrequiredforcrystalchoices.Inaddition,theworkofcrystaltemperatureandfrequencystabilityisalsoveryimportantindicators.②Selectthetypeofoscillator.PICMCUhasRC,LP,XT,HS,suchasoscillationmodes.InadditiontoRCmode,theoscillationmodestochooseisinfactthechoiceofloopgain.Lowgaincorrespondstoalowoscillationfrequency,highgaincorrespondstothehighoscillationfrequency.Generallyrequiredinaccordancewiththeactualoperatingfrequencycanbeselectedreferencemanual.③SelectC1,C2.Ideally,thesystemathightemperatureandtheminimumoperatingvoltageofthenormalworkcanmakecapacitanceinthedatamanualrecommendtheframeworkofthesmallest.Atthesametime,chooseC2thanC1largerphaseshifttoincreasesothatitisconducivetotheoscillatorcircuitofelectricstart.④SelectRs.IntheaboveparametershavebeenselectedtodecidethesizeofRs.Easywayistoletthesystemworkintheminimumtemperatureandmaximumvoltagecircumstances,shouldbereceivedatthistimearethemaximumoutputrateoftheclockcircuit.OscilloscopeobservationOSC2pinwiththeoutputwaveformNotethattheoscilloscopeprobewillintroduceacapacitancecircuit,typicallyafewpF,IfitisfoundthatthepeaksinewavereceiverVddandValleyVssreceivingOfficewas削平orpressureflatondriveroverload,OSC2andC2needtoaddaresistorbetweenRs,generallyaround1kΩorlessthan1kΩ.Rsnotbetoobig,toogeneralmakestheinputandoutputarisingfromtheisolation,resultinginlargernoise.WhentheyfindalargerRsrequiredtoremoveoverdriven,theloadcapacitanceC2canbeincreasedtocompensate.C2generallychoosebetweenthe1533pF.Oscillatorcircuitdesignsystemofsystemstability,powerconsumption,suchasagreatinfluence.Undernormalcircumstances,thesystemwakeupcallfromtheSleepstate,theoscillatorcircuitthemostdifficulttostartespeciallythesystemathightemperature,lowpressure,lowfrequencycase.Atthispoint,theresistorRsisconducivetostartuposcillatorcircuit,becauseofcheapcarbonfilmresistorspronetowhitenoise,thushelpingstartupcircuit.Inaddition,thechoiceofC2toC1inordertoincreaseslightlylargerphaseshift,butalsoconducivetostartupcircuit.2examplesofspecificapplications2.1SystemdiagramofthecompositionandSystemismainlycomposedPICmicrocontroller,dualaudiodecodingcircuitdialing,voiceintegratedcircuits,interfacecircuits,Vccpowercontrolcircuit,RFcircuitandEEPROM,whichcanbecompletedonthehomeappliancecontrolandvoiceinformationtothepoliceforhelpautomatictransmission,asshowninFigure3.2.2controllerworkingmethodsWhenthestringwiththecontrollerheardthephonehereinafterreferredtoasthelocalmachineispickingmachine,thetelephonelineinputvoltagechange,causedby2feetCD40106thechangeinoutputlevel,inputtotheCPUportsofRb0generateaninterruptsignal,wakeupCPU,controllertoentertheworkingstate.Dialingthroughthelocaldiskonthecontrollertocontrolvariousfunctions.ControlsuchasTV,audio,lightingandotherelectricalpowerswitching.Whenthecontrollersreceivetheringingsignal,CD401064pinoutputlevelchangesintheCPUinputportRB6generateaninterruptsignaltowakeupCPUaccesstojobstatus,andringingsignalcountachievesetringingafterafewsothatthestateofthecontrollertoenterthetelephonereceiverandbegantoreceivelongdistancetransmissionDTMFsignalbythesignaldemodulationMT8880throughtheIRQinterruptsignalsenttothesinglechipdataintotheregisterbytheCPUtooperatethevariousfunctionsofthecontrollercontrol.Whenthecontrollerasanalarm,andguardinthestate,thealarmdetectionprobeatalltimestopreventthesituationintheregionWhentheprobetothecontrollerissuedapoliceintelligenceinformation,theRB5inputCPUinterruptsignal,thecontrollertoentertheworkingstate,fromtheEEPROMchipReadapresetalarmphonenumbers,bytheMT8880isconvertedtoDTMFsignals,automaticdialuptovoicetheformofinformationtransmittedtotheuseroradirectreporttothepolice.2.3ApplicationCircuit1TelephoneInterfaceCircuitTelephonewiththecontrollerusingthecontrollerintheformer,telephoneinthelatterseriesthewaythecontrollercanachieveavarietyoftelephonecontrolfunctions.Interfacecircuitfromovervoltageprotectioncircuit,polarityconversioncircuitandinterruptrequestcircuitshowninFigure4.

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