会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > DOC文档下载

外文翻译--单片MHZ 无线收发器nRF905.doc

  • 资源星级:
  • 资源大小:378.00KB   全文页数:13页
  • 资源格式: DOC        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--单片MHZ 无线收发器nRF905.doc

http//www.dxsbl.net/大学生部落大学生第一门户社区http//www.dxsbl.net/大学生部落大学生第一门户社区1Singlechip433/868/915MHzTransceivernRF905FEATURESTruesinglechipGFSKtransceiverinasmall32pinpackage32LQFN5x5mmShockBurst™modeforlowpoweroperationPowersupplyrange1.9to3.6VMultichanneloperation–ETSI/FCCCompatibleChannelswitchingtime650sExtremelylowcostBillofMaterialBOMNoexternalSAWfilterAdjustableoutputpowerupto10dBmCarrierdetectforlistenbeforetransmitprotocolsDataReadysignalwhenavaliddatapackageisreceivedortransmittedAddressMatchfordetectionofincomingpackageAutomaticretransmissionofdatapackagesAutomaticCRCandpreamblegenerationAPPLICATIONSWirelessdatacommunicationAlarmandsecuritysystemsHomeAutomationRemotecontrolSurveillanceAutomotiveTelemetryIndustrialsensorsKeylessentryToysGENERALDESCRIPTIONnRF905isasinglechipradiotransceiverforthe433/868/915MHzISMband.Thetransceiverconsistsofafullyintegratedfrequencysynthesiser,receiverchainwithdemodulator,apoweramplifier,acrystaloscillatorandamodulator.TheShockBurstTMfeatureautomaticallyhandlespreambleandCRC.ConfigurationiseasilyprogrammablebyuseoftheSPIinterface.Currentconsumptionisverylow,intransmitonly11mAatanoutputpowerof10dBm,andinreceivemode12.5mA.Builtinpowerdownmodesmakespowersavingeasilyrealizable.MODESOFOPERATIONThenRF905hastwoactiveRX/TXmodesandtwopowersavingmodesACTIVEMODESShockBurst™RXShockBurst™TXPOWERSavingModesPowerdownandSPIprogrammingStandbyandSPIprogrammingThenRF905modeisdecidedbythesettingsofTRX_CE,TX_ENandPWR_UP.http//www.dxsbl.net/大学生部落大学生第一门户社区http//www.dxsbl.net/大学生部落大学生第一门户社区2nRFShockBurst™ModesThenRF905usestheNordicVLSIShockBurst™feature.ShockBurstTMmakesitpossibletousethehighdatarateofferedbythenRF905withouttheneedofacostly,highspeedmicrocontrollerMCUfordataprocessing/clockrecovery.ByplacingallhighspeedsignalprocessingrelatedtoRFprotocolonchip,thenRF905offerstheapplicationmicrocontrollerasimpleSPIinterface,thedatarateisdecidedbytheinterfacespeedthemicrocontrolleritselfsetsup.Byallowingthedigitalpartoftheapplicationtorunatlowspeed,whilemaximizingthedatarateontheRFlink,thenRF905ShockBurst™modereducestheaveragecurrentconsumptioninapplications.InShockBurstTMRX,AddressMatchAMandDataReadyDRnotifiestheMCUwhenavalidaddressandpayloadisreceivedrespectively.InShockBurstTMTX,thenRF905automaticallygeneratespreambleandCRC.DataReadyDRnotifiestheMCUthatthetransmissioniscompleted.Alltogether,thismeansreducedmemorydemandintheMCUresultinginalowcostMCU,aswellasreducedsoftwaredevelopmenttime.TypicalShockBurst™TX1.WhentheapplicationMCUhasdataforaremotenode,theaddressofthereceivingnodeTXaddressandpayloaddataTXpayloadareclockedintonRF905viatheSPIinterface.TheapplicationprotocolorMCUsetsthespeedoftheinterface.2.MCUsetsTRX_CEandTX_ENhigh,thisactivatesanRF905ShockBurst™transmission.3.nRF905ShockBurst™Radioisautomaticallypoweredup.Datapackageiscompletedpreambleadded,CRCcalculated.Datapackageistransmitted100kbps,GFSK,Manchesterencoded.DataReadyissethighwhentransmissioniscompleted.4.IfAUTO_RETRANissethigh,thenRF905continuouslyretransmitsthepackageuntilTRX_CEissetlow.5.WhenTRX_CEissetlow,thenRF905finishestransmittingtheoutgoingpackageandthensetsitselfintostandbymode.TheShockBurstTMmodeensuresthatatransmittedpackagethathasstartedalwaysfinishesregardlessofwhatTRX_ENandTX_ENissettoduringtransmission.Thenewmodeisactivatedwhenthetransmissioniscompleted.PleaseseesubsequentchaptersfordetailedtimingFortestpurposessuchasantennatuningandmeasuringoutputpoweritispossibletosetthetransmittersothataconstantcarrierisproduced.TodothisTRX_CEmustbemaintainedhighinsteadofbeingpulsed.InadditionAutoRetransmitshouldbeswitchedoff.Aftertheburstofdatahasbeensentthenthedevicewillcontinuetosendtheunmodulatedcarrier.TypicalShockBurst™RX1.ShockBurstTMRXisselectedbysettingTRX_CEhighandTX_ENlow.2.After650snRF905ismonitoringtheairforincomingcommunication.3.WhenthenRF905sensesacarrieratthereceivingfrequency,CarrierDetectCDpinissethigh.4.Whenavalidaddressisreceived,AddressMatchAMpinissethigh.http//www.dxsbl.net/大学生部落大学生第一门户社区http//www.dxsbl.net/大学生部落大学生第一门户社区35.WhenavalidpackagehasbeenreceivedcorrectCRCfound,nRF905removesthepreamble,addressandCRCbits,andtheDataReadyDRpinissethigh.6.MCUsetstheTRX_CElowtoenterstandbymodelowcurrentmode.7.MCUcanclockoutthepayloaddataatasuitablerateviatheSPIinterface.8.Whenallpayloaddataisretrieved,nRF905setsDataReadyDRandAddressMatchAMlowagain.9.ThechipisnowreadyforenteringShockBurstTMRX,ShockBurstTMTXorpowerdownmode.IfTRX_CEorTX_ENischangedduringanincomingpackage,thenRF905changesmodeimmediatelyandthepackageislost.However,iftheMCUissensingtheAddressMatchAMpin,itknowswhenthechipisreceivinganincomingpackageandcanthereforedecidewheathertowaitfortheDataReadyDRsignalorenteradifferentmode.PowerDownModesInpowerdownthenRF905isdisabledwithminimalcurrentconsumption,typicallyminimizeaveragecurrentconsumptionandmaximizingbatterylifetime.Theconfigurationwordcontentismaintainedduringpowerdown.StandbymodeStandbymodeisusedtominimizeaveragecurrentconsumptionwhilemaintainingshortstartuptimestoShockBurstTMRXandShockBurstTMTX.Inthismodepartofthecrystaloscillatorisactive.Currentconsumptionisdependentoncrystalfrequency,Ex.IftheuPclockpin3ofnRF905isenabled,currentconsumptionincreasesandisdependentontheloadcapacitanceandfrequency.Theconfigurationwordcontentismaintainedduringstandby.DevieconfigurationAllconfigurationofthenRF905isviatheSPIinterface.TheinterfaceconsistsoffiveregistersaSPIinstructionsetisusedtodecidewhichoperationshallbeperformed.TheSPIinterfacecanonlybeactivatedwhenthechipisinstandbyorpowerdownmode.SPIRegistersconfigurationTheSPIinterfaceconsistsoffiveinternalregisters.Aregisterreadbackmodeisimplementedtoallowverificationoftheregistercontents.Figure6SPI–interfaceandthefiveinternalregisters.http//www.dxsbl.net/大学生部落大学生第一门户社区http//www.dxsbl.net/大学生部落大学生第一门户社区4StatusRegisterRegistercontainsstatusofDataReadyDRandAddressMatchAM.RFConfigurationRegisterRegistercontainstransceiversetupinformationsuchasfrequencyandoutputpowerext.TXAddersRegistercontainsaddressoftargetdevice.Howmanybytesusedissetintheconfigurationregister.TXPayloadRegistercontainingthepayloadinformationtobesentinaShockBurstTMpackage.Howmanybytesusedissetintheconfigurationregister.RXPayloadRegistercontainingthepayloadinformationderivedfromareceivedvalidShockBurstTMpackage.Howmanybytesusedissetintheconfigurationregister.ValiddataintheRXPayloadregisterisindicatedwithahighDateReadyDRsignal.SPIInstructionSetTheavailablecommandstobeusedontheSPIinterfaceisshownbelow.WheneverCSNissetlowtheinterfaceexpectsaninstruction.EverynewinstructionmustbestartedbyahightolowtransitiononCSN.Table8InstructionsetforthenRF905SPIinterface.Areadorawriteoperationmayoperateonasinglebyteoronasetofsucceedingbytesfromagivenstartaddressdefinedbytheinstruction.WhenaccessingsucceedingbytesonewillreadorwriteMSBofthebytewiththesmallestbytenumberfirst.ThecontentofthestatusregisterwillalwaysbereadtoMISOaftera

注意事项

本文(外文翻译--单片MHZ 无线收发器nRF905.doc)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5