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外文翻译--单片MHZ 无线收发器nRF905.doc

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外文翻译--单片MHZ 无线收发器nRF905.doc

HTTP//WWWDXSBLNET/大学生部落大学生第一门户社区HTTP//WWWDXSBLNET/大学生部落大学生第一门户社区1SINGLECHIP433/868/915MHZTRANSCEIVERNRF905FEATURESTRUESINGLECHIPGFSKTRANSCEIVERINASMALL32PINPACKAGE32LQFN5X5MMSHOCKBURST™MODEFORLOWPOWEROPERATIONPOWERSUPPLYRANGE19TO36VMULTICHANNELOPERATION–ETSI/FCCCOMPATIBLECHANNELSWITCHINGTIME650SEXTREMELYLOWCOSTBILLOFMATERIALBOMNOEXTERNALSAWFILTERADJUSTABLEOUTPUTPOWERUPTO10DBMCARRIERDETECTFORLISTENBEFORETRANSMITPROTOCOLSDATAREADYSIGNALWHENAVALIDDATAPACKAGEISRECEIVEDORTRANSMITTEDADDRESSMATCHFORDETECTIONOFINCOMINGPACKAGEAUTOMATICRETRANSMISSIONOFDATAPACKAGESAUTOMATICCRCANDPREAMBLEGENERATIONAPPLICATIONSWIRELESSDATACOMMUNICATIONALARMANDSECURITYSYSTEMSHOMEAUTOMATIONREMOTECONTROLSURVEILLANCEAUTOMOTIVETELEMETRYINDUSTRIALSENSORSKEYLESSENTRYTOYSGENERALDESCRIPTIONNRF905ISASINGLECHIPRADIOTRANSCEIVERFORTHE433/868/915MHZISMBANDTHETRANSCEIVERCONSISTSOFAFULLYINTEGRATEDFREQUENCYSYNTHESISER,RECEIVERCHAINWITHDEMODULATOR,APOWERAMPLIFIER,ACRYSTALOSCILLATORANDAMODULATORTHESHOCKBURSTTMFEATUREAUTOMATICALLYHANDLESPREAMBLEANDCRCCONFIGURATIONISEASILYPROGRAMMABLEBYUSEOFTHESPIINTERFACECURRENTCONSUMPTIONISVERYLOW,INTRANSMITONLY11MAATANOUTPUTPOWEROF10DBM,ANDINRECEIVEMODE125MABUILTINPOWERDOWNMODESMAKESPOWERSAVINGEASILYREALIZABLEMODESOFOPERATIONTHENRF905HASTWOACTIVERX/TXMODESANDTWOPOWERSAVINGMODESACTIVEMODESSHOCKBURST™RXSHOCKBURST™TXPOWERSAVINGMODESPOWERDOWNANDSPIPROGRAMMINGSTANDBYANDSPIPROGRAMMINGTHENRF905MODEISDECIDEDBYTHESETTINGSOFTRX_CE,TX_ENANDPWR_UPHTTP//WWWDXSBLNET/大学生部落大学生第一门户社区HTTP//WWWDXSBLNET/大学生部落大学生第一门户社区2NRFSHOCKBURST™MODESTHENRF905USESTHENORDICVLSISHOCKBURST™FEATURESHOCKBURSTTMMAKESITPOSSIBLETOUSETHEHIGHDATARATEOFFEREDBYTHENRF905WITHOUTTHENEEDOFACOSTLY,HIGHSPEEDMICROCONTROLLERMCUFORDATAPROCESSING/CLOCKRECOVERYBYPLACINGALLHIGHSPEEDSIGNALPROCESSINGRELATEDTORFPROTOCOLONCHIP,THENRF905OFFERSTHEAPPLICATIONMICROCONTROLLERASIMPLESPIINTERFACE,THEDATARATEISDECIDEDBYTHEINTERFACESPEEDTHEMICROCONTROLLERITSELFSETSUPBYALLOWINGTHEDIGITALPARTOFTHEAPPLICATIONTORUNATLOWSPEED,WHILEMAXIMIZINGTHEDATARATEONTHERFLINK,THENRF905SHOCKBURST™MODEREDUCESTHEAVERAGECURRENTCONSUMPTIONINAPPLICATIONSINSHOCKBURSTTMRX,ADDRESSMATCHAMANDDATAREADYDRNOTIFIESTHEMCUWHENAVALIDADDRESSANDPAYLOADISRECEIVEDRESPECTIVELYINSHOCKBURSTTMTX,THENRF905AUTOMATICALLYGENERATESPREAMBLEANDCRCDATAREADYDRNOTIFIESTHEMCUTHATTHETRANSMISSIONISCOMPLETEDALLTOGETHER,THISMEANSREDUCEDMEMORYDEMANDINTHEMCURESULTINGINALOWCOSTMCU,ASWELLASREDUCEDSOFTWAREDEVELOPMENTTIMETYPICALSHOCKBURST™TX1WHENTHEAPPLICATIONMCUHASDATAFORAREMOTENODE,THEADDRESSOFTHERECEIVINGNODETXADDRESSANDPAYLOADDATATXPAYLOADARECLOCKEDINTONRF905VIATHESPIINTERFACETHEAPPLICATIONPROTOCOLORMCUSETSTHESPEEDOFTHEINTERFACE2MCUSETSTRX_CEANDTX_ENHIGH,THISACTIVATESANRF905SHOCKBURST™TRANSMISSION3NRF905SHOCKBURST™RADIOISAUTOMATICALLYPOWEREDUPDATAPACKAGEISCOMPLETEDPREAMBLEADDED,CRCCALCULATEDDATAPACKAGEISTRANSMITTED100KBPS,GFSK,MANCHESTERENCODEDDATAREADYISSETHIGHWHENTRANSMISSIONISCOMPLETED4IFAUTO_RETRANISSETHIGH,THENRF905CONTINUOUSLYRETRANSMITSTHEPACKAGEUNTILTRX_CEISSETLOW5WHENTRX_CEISSETLOW,THENRF905FINISHESTRANSMITTINGTHEOUTGOINGPACKAGEANDTHENSETSITSELFINTOSTANDBYMODETHESHOCKBURSTTMMODEENSURESTHATATRANSMITTEDPACKAGETHATHASSTARTEDALWAYSFINISHESREGARDLESSOFWHATTRX_ENANDTX_ENISSETTODURINGTRANSMISSIONTHENEWMODEISACTIVATEDWHENTHETRANSMISSIONISCOMPLETEDPLEASESEESUBSEQUENTCHAPTERSFORDETAILEDTIMINGFORTESTPURPOSESSUCHASANTENNATUNINGANDMEASURINGOUTPUTPOWERITISPOSSIBLETOSETTHETRANSMITTERSOTHATACONSTANTCARRIERISPRODUCEDTODOTHISTRX_CEMUSTBEMAINTAINEDHIGHINSTEADOFBEINGPULSEDINADDITIONAUTORETRANSMITSHOULDBESWITCHEDOFFAFTERTHEBURSTOFDATAHASBEENSENTTHENTHEDEVICEWILLCONTINUETOSENDTHEUNMODULATEDCARRIERTYPICALSHOCKBURST™RX1SHOCKBURSTTMRXISSELECTEDBYSETTINGTRX_CEHIGHANDTX_ENLOW2AFTER650SNRF905ISMONITORINGTHEAIRFORINCOMINGCOMMUNICATION3WHENTHENRF905SENSESACARRIERATTHERECEIVINGFREQUENCY,CARRIERDETECTCDPINISSETHIGH4WHENAVALIDADDRESSISRECEIVED,ADDRESSMATCHAMPINISSETHIGHHTTP//WWWDXSBLNET/大学生部落大学生第一门户社区HTTP//WWWDXSBLNET/大学生部落大学生第一门户社区35WHENAVALIDPACKAGEHASBEENRECEIVEDCORRECTCRCFOUND,NRF905REMOVESTHEPREAMBLE,ADDRESSANDCRCBITS,ANDTHEDATAREADYDRPINISSETHIGH6MCUSETSTHETRX_CELOWTOENTERSTANDBYMODELOWCURRENTMODE7MCUCANCLOCKOUTTHEPAYLOADDATAATASUITABLERATEVIATHESPIINTERFACE8WHENALLPAYLOADDATAISRETRIEVED,NRF905SETSDATAREADYDRANDADDRESSMATCHAMLOWAGAIN9THECHIPISNOWREADYFORENTERINGSHOCKBURSTTMRX,SHOCKBURSTTMTXORPOWERDOWNMODEIFTRX_CEORTX_ENISCHANGEDDURINGANINCOMINGPACKAGE,THENRF905CHANGESMODEIMMEDIATELYANDTHEPACKAGEISLOSTHOWEVER,IFTHEMCUISSENSINGTHEADDRESSMATCHAMPIN,ITKNOWSWHENTHECHIPISRECEIVINGANINCOMINGPACKAGEANDCANTHEREFOREDECIDEWHEATHERTOWAITFORTHEDATAREADYDRSIGNALORENTERADIFFERENTMODEPOWERDOWNMODESINPOWERDOWNTHENRF905ISDISABLEDWITHMINIMALCURRENTCONSUMPTION,TYPICALLYMINIMIZEAVERAGECURRENTCONSUMPTIONANDMAXIMIZINGBATTERYLIFETIMETHECONFIGURATIONWORDCONTENTISMAINTAINEDDURINGPOWERDOWNSTANDBYMODESTANDBYMODEISUSEDTOMINIMIZEAVERAGECURRENTCONSUMPTIONWHILEMAINTAININGSHORTSTARTUPTIMESTOSHOCKBURSTTMRXANDSHOCKBURSTTMTXINTHISMODEPARTOFTHECRYSTALOSCILLATORISACTIVECURRENTCONSUMPTIONISDEPENDENTONCRYSTALFREQUENCY,EXIFTHEUPCLOCKPIN3OFNRF905ISENABLED,CURRENTCONSUMPTIONINCREASESANDISDEPENDENTONTHELOADCAPACITANCEANDFREQUENCYTHECONFIGURATIONWORDCONTENTISMAINTAINEDDURINGSTANDBYDEVIECONFIGURATIONALLCONFIGURATIONOFTHENRF905ISVIATHESPIINTERFACETHEINTERFACECONSISTSOFFIVEREGISTERS;ASPIINSTRUCTIONSETISUSEDTODECIDEWHICHOPERATIONSHALLBEPERFORMEDTHESPIINTERFACECANONLYBEACTIVATEDWHENTHECHIPISINSTANDBYORPOWERDOWNMODESPIREGISTERSCONFIGURATIONTHESPIINTERFACECONSISTSOFFIVEINTERNALREGISTERSAREGISTERREADBACKMODEISIMPLEMENTEDTOALLOWVERIFICATIONOFTHEREGISTERCONTENTSFIGURE6SPI–INTERFACEANDTHEFIVEINTERNALREGISTERSHTTP//WWWDXSBLNET/大学生部落大学生第一门户社区HTTP//WWWDXSBLNET/大学生部落大学生第一门户社区4STATUSREGISTERREGISTERCONTAINSSTATUSOFDATAREADYDRANDADDRESSMATCHAMRFCONFIGURATIONREGISTERREGISTERCONTAINSTRANSCEIVERSETUPINFORMATIONSUCHASFREQUENCYANDOUTPUTPOWEREXTTXADDERSREGISTERCONTAINSADDRESSOFTARGETDEVICEHOWMANYBYTESUSEDISSETINTHECONFIGURATIONREGISTERTXPAYLOADREGISTERCONTAININGTHEPAYLOADINFORMATIONTOBESENTINASHOCKBURSTTMPACKAGEHOWMANYBYTESUSEDISSETINTHECONFIGURATIONREGISTERRXPAYLOADREGISTERCONTAININGTHEPAYLOADINFORMATIONDERIVEDFROMARECEIVEDVALIDSHOCKBURSTTMPACKAGEHOWMANYBYTESUSEDISSETINTHECONFIGURATIONREGISTERVALIDDATAINTHERXPAYLOADREGISTERISINDICATEDWITHAHIGHDATEREADYDRSIGNALSPIINSTRUCTIONSETTHEAVAILABLECOMMANDSTOBEUSEDONTHESPIINTERFACEISSHOWNBELOWWHENEVERCSNISSETLOWTHEINTERFACEEXPECTSANINSTRUCTIONEVERYNEWINSTRUCTIONMUSTBESTARTEDBYAHIGHTOLOWTRANSITIONONCSNTABLE8INSTRUCTIONSETFORTHENRF905SPIINTERFACEAREADORAWRITEOPERATIONMAYOPERATEONASINGLEBYTEORONASETOFSUCCEEDINGBYTESFROMAGIVENSTARTADDRESSDEFINEDBYTHEINSTRUCTIONWHENACCESSINGSUCCEEDINGBYTESONEWILLREADORWRITEMSBOFTHEBYTEWITHTHESMALLESTBYTENUMBERFIRSTTHECONTENTOFTHESTATUSREGISTERWILLALWAYSBEREADTOMISOAFTERA

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