2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、外文文獻(xiàn)及其譯文外文文獻(xiàn)及其譯文外文文獻(xiàn)：MAXIM:CostSavingMultichemistryBattergerSystem，2002MAX846Achipbrief1.MAX846ApinpowerMaximproducedMAX846Aisalowcostmultipurposebatterygecontrollerusing16pinQSOPpackagecanaloneconstitutealithiumionbatte

2、rygercanalsobeunderthecontrolofthemicrocontrolleroflithiumionbatteriesnickelhydridebatteriesnickelcadmiumregeablebatteries.MAX846ApinarrangementasshowninFigure41themainpinfunctionasfollows:①DCIN:anexternalDCpowersupplyou

3、tput3.7~20V.②VL:3.3V20mA1%linearregulatoutput.③CC1:currentregulationloopcompensationside.④CCV:compensationfterminalvoltageregulationloop.⑤VSET:floatingvoltagereferenceadjustmentinput.⑥ISET:currentsettingscontrolinputterm

4、inal.⑦OFFV:voltageregulationlooptoprohibitside.⑧CELL2:Programmingthenumberofgingpowersupplyterminal.⑨BATT:Batteryinput.⑩CS:highvoltagecurrentsourceamplifierinput.○11CS:lowvoltagecurrentsourceamplifierinput.○12DRV:Externa

5、ltransistbasegatedinput.2.MAX846AtheinternalstructureofMAX846AMultiFunctionBatterygerControllerfrom3.3Vhighprecisionlowoutlinearregulatpowersupplyaswellashighprecisionvoltagereferencesourcevoltagecurrentregulatthreeparts

6、.LinearregulatedpowersupplyoutputvoltageVListwicethereferencevoltagecanprovide20mAfexternalloadcurrent.LowoutRegulatpowersupplyhasshtcircuitprotectionPWROK(PowerOK)fthemicrocontrollerprovidestheresetsignalcanbecontrolled

7、lithiumionbatterygecurrent.Highprecisionvoltagereferencesourceflithiumionbatterytoprovideaccuratefloatvoltageitiswithaprecisionof2%ofthe20kresistconnectedtofloatvoltagecanbesetbyanexternalresist.Externalresistsshouldhave

8、1%accuracybecauseadirectimpactontheexternalresistfloatvoltageaccuracywhilethefloatvoltageaccuracydirectlytolithiumionbatterylifecapacityofanimpact.Voltagecurrentregulatiscontrolledbyaprecisionattenuatvoltageloopcurrentlo

9、opcurrentsenseamplifier.Throughtheattenuatsettingtheoutputvoltageisstabilizedatalithiumionbatteryvoltage(crespondingtovoltageof4.2V)twolithiumionbatteryvoltage(crespondingtovoltageof8.4V)level.Currentsenseamplifiersfdete

10、ctinghighcurrentlithiumionbatteryitisactuallyatransconductanceamplifiercanbeexternallylimitingthevoltageacrossresistRCSconvertedintocurrentthiscurrentisappliedtoanexternalloadresistRISET.BychangingtheRCSoftheresistanceca

11、nbeadjustedwiththeRISETgecurrentbutalsobychangingtheRISETincreasedecreasethevoltageofthelowendsideofthecurrentregulationISETgecurrent.Voltage④gerinputvoltagerange:220V10%50Hzgecurrentupto2.0A.8bitMicrocontrollerwith2KByt

12、esFlashAT89C20511.Features①CompatiblewithMCS51Products2KBytesofReprogrammableFlashMemyEndurance:10000WriteEraseCycle②2.7Vto6VOperatingRange③FullyStaticOperation:0Hzto24MHz④TwolevelProgramMemyLock⑤128x8bitInternalRAM⑥15Pr

13、ogrammableIOLines⑦Two16bitTimerCounters⑧SixInterruptSources⑨ProgrammableSerialUARTChannel⑩DirectLEDDriveOutputsOnchipAnalogComparat○11LowpowerIdlePowerdownModes○12Green(PbHalidefree)PackagingOption○132.DeionTheAT89C2051i

14、salowvoltagehighperfmanceCMOS8bitmicrocomputerwith2KbytesofFlashprogrammableerasablereadonlymemy(PEROM).ThedeviceismanufacturedusingAtmelshighdensitnonvolatilememytechnologyiscompatiblewiththeindustrystardMCS51instructio

15、nset.Bycombiningaversatile8bitCPUwithFlashonamonolithicchiptheAtmelAT89C2051isapowerfulmicrocomputerwhichprovidesahighlyflexiblecosteffectivesolutiontomanyembeddedcontrolapplications.TheAT89C2051providesthefollowingstard

16、features:2KbytesofFlash128bytesofRAM15IOlinestwo16bittimercountersafivevecttwolevelinterruptarchitectureafullduplexserialptaprecisionanalogcomparatonchiposcillatclockcircuitry.InadditiontheAT89C2051isdesignedwithstaticlo

17、gicfoperationdowntozerofrequencysupptstwosoftwareablepowersavingmodes.TheIdleModestopstheCPUwhileallowingtheRAMtimercountersserialptinterruptsystemtocontinuefunctioning.ThepowerdownmodesavestheRAMcontentsbutfreezestheosc

18、illatdisablingallotherchipfunctionsuntilthenexthardwarereset.AbouthardwarecircuitSmartgerfromthepowertransfmerrectifierfiltercircuitthevoltageregulatcircuitsACDCconverter.ATMELmicroprocesslaunchedbythehighcostperfmancemi

19、crocontrollerAT89C2051thedevice80C31ceinstructionMCS51series100%compatibleonchipintegrationwith2Kbytesofflashmemyerasedbypowercanberepeatedprogramming.8bitserialsuccessiveapproximationADconversionchipADC0832realtimedetec

20、tionofgecurrentvoltagesizeitstwoanaloginputchannelsisprogrammablesoftstructuresmaybetheserialinputptthreeserialcontrolwdsspecifiedchanneldecidedtosingleendedinputdifferentialinputmodethegertwoanaloginputchannels(CH0CH1)a

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