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zH4. 合符， ECsoR誉信和, rat-sFR、信诚、“，把供者案 微控制系 –具有代码预取功能的高性能和低功率8051微 制器内数据速 –系统内可编程闪存，128或者256 –在所有功率模式下具有保持功能的8KB应 –支持硬件调高达0dBm的可编程输出功 –扩展基带自动化，包括自动确认和地出色 –所有功率模式中对所有相关寄存器的保 外统：ETSIEN300328EN3004402类

（欧洲），FCCCFR4715部分（）， –通用定时器（1个16位，2个8位ARIBSTD-T66（ –红外(IR)生成电布 –具有捕捉功能的32kHz睡眠定时 –精确数字接收到的数字信号强度指示器6mm6mm(QFN)-40时TX(0RX低至：14.7mA（3V电源TX(0dBm)：14.3mA（3V电源

)2个功能强大的支持几个串行协议的通用异步接收发器(UART)23I/O(21×4mA，2×I2CSmartRFPleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddierstheretoappearsattheendofthisdatasheet.ZigBeeisaregisteredtrademarkofZigBeeAlliance.isatrademarkof~BluetoothSIG,Inc..软件特 含有TPS62730的符合针对单模式蓝牙低能耗(BLE)解决方案的符合 TPS62730是一款具有旁通模式的2MHz降压转换蓝牙4.0协议的堆栈 GAP-中心设备，外设，或者广播器（包 属性协议(ATT)/通用属性配置文 RF性能并未改(GATT)–客户端和服务 对称式对多重处理(SMP)-AES-128加密 针对GAP中心 距 GATT服 BLE软件栈内支 应 器、 -(Windows)PC应 I2CI/OCC2541CC2540应用范 6mmx6mm方形扁平无引脚(QFN)40封装内引脚 容。与CC2540相比，CC2541提供更低RF流耗私有的2.4GHz系 CC2541没有CC2540所具有的USB接口，并在 1个HWI2C接口移 附 CC2541与CC2533优化RF4CEIEEE802.15.4 CC2541的方框图请参见Figure1ThisintegratedcircuitcanbedamagedbyESD.TexasInstruments mendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.

I/OI/O

ADCAUDIO/DC

Figure1.BlockABSOLUTEUMoveroperatingfree-airtemperaturerange(unlessotherwiseSupplyAllsupplypinsmusthavethesameVVoltageonanydigitalVDD+0.3≤VInputRFStoragetemperatureAllpins,excludingpins25and26,accordingtohuman-bodymodel,JEDECSTD22,methodA1142Allpins,accordingtohuman-bodymodel,JEDECSTD22,methodA1141Accordingtocharged-devicemodel,JEDECSTD22,methodVStressesbeyondthoselistedunderAbsoluteumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder mendedOperatingConditionsisnotimplied.Exposuretoabsolute-um-ratedconditionsforextendedperiodsmayaffectdevicereliability.CAUTION:ESDsesnsitivedevice.PrecautionsshouldbeusedwhenhandlingthedeviceinordertopreventpermanentMENDEDOPERATINGoveroperatingfree-airtemperaturerange(unlessotherwiseOperatingambienttemperaturerange,Operatingsupply2VELECTRICALMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°CandVDD=31Mbps,GFSK,250-kHzdeviation,Bluetoothlowenergymode,and0.1%TEST TYP CorecurrentRXmode,standardmode,noperipheralsactive,lowMCURXmode,high-gainmode,noperipheralsactive,lowMCUTXmode,–20dBmoutputpower,noperipheralsactive,lowMCUactivityTXmode,0dBmoutputpower,noperipheralsactive,lowMCUactivityPowermode1.Digitalregulatoron;16-MHzRCOSCand32-MHzcrystaloscillatoroff;32.768-kHzXOSC,POR,BODandsleeptimeractive;RAMandregisterretentionPowermode2.Digitalregulatoroff;16-MHzRCOSCand32-MHzcrystaloscillatoroff;32.768-kHzXOSC,POR,andsleeptimeractive;RAMandregisterretention1Powermode3.Digitalregulatoroff;noclocks;PORactive;RAMandregisterretentionLowMCUactivity:32-MHzXOSCrunning.Noradioorperipherals.Limitedflashaccess,noRAMaccess.Peripheralcurrentconsumption (AddstocorecurrentIcoreforeachperipheralunitTimer1.Timerrunning,32-MHzXOSCTimer2.Timerrunning,32-MHzXOSCTimer3.Timerrunning,32-MHzXOSCTimer4.Timerrunning,32-MHzXOSCSleeptimer,including32.753-kHzADC,whenGENERALMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°CandVDD=3TESTWAKE-UPANDPowermode1→Digitalregulatoron,16-MHzRCOSCand32-MHzcrystaloscillatoroff.Start-upof16-MHzRCOSC4Powermode2or3→Digitalregulatoroff,16-MHzRCOSCand32-MHzcrystaloscillatoroff.Start-upofregulatorand16-MHzRCOSCActive→TXorCrystalESR=16Ω.Initiallyrunningon16-MHzRCOSC,with32-MHzXOSCOFFWith32-MHzXOSCinitiallyRX/TXProprietaryautoBLERADIORFfrequencyProgrammablein1-MHzDatarateandmodulation2Mbps,GFSK,500-kHzdeviation2Mbps,GFSK,320-kHzdeviation1Mbps,GFSK,250-kHzdeviation1Mbps,GFSK,160-kHzdeviation500kbps,MSK250kbps,GFSK,160-kHzdeviation250kbps,MSKRFRECEIVEMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°C,VDD=3V,fc=2440TEST2Mbps,GFSK,500-kHzDeviation,0.1%ReceiverBER<Co-channelWantedsignalat–67In-bandblocking±2MHzoffset,0.1%BER,wantedsignal–67±4MHzoffset,0.1%BER,wantedsignal–67±6MHzorgreateroffset,0.1%BER,wantedsignal–67FrequencyerrorIncludingbothinitialtoleranceanddrift.Sensitivitybetterthan–67dBm,250bytepayload.BER0.1%umpacketlength.Sensitivitybetterthan–67dBm,250bytepayload.BER0.1%2Mbps,GFSK,320-kHzDeviation,0.1%ReceiverBER<Co-channelWantedsignalat–67In-bandblocking±2MHzoffset,0.1%BER,wantedsignal–67±4MHzoffset,0.1%BER,wantedsignal–67±6MHzorgreateroffset,0.1%BER,wantedsignal–67FrequencyerrorIncludingbothinitialtoleranceanddrift.Sensitivitybetterthan–67dBm,250bytepayload.BER0.1%umpacketlength.Sensitivitybetterthan–67dBm,250bytepayload.BER0.1%DifferencebetweencenterfrequencyofthereceivedRFsignalandlocaloscillatorDifference ingsymbolrateandtheinternallygeneratedsymbolRFRFRECEIVESECTIONMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°C,VDD=3V,fc=2440TEST1Mbps,GFSK,250-kHzDeviation,BluetoothlowenergyMode,0.1%ReceiverHigh-gainStandardBER<5Co-channelWantedsignal–67In-bandblocking±1MHzoffset,0.1%BER,wantedsignal–67±2MHzoffset,0.1%BER,wantedsignal–67±3MHzoffset,0.1%BER,wantedsignal–67>6MHzoffset,0.1%BER,wantedsignal–67Out-of-bandblockingMinimuminterfererlevel<2GHz(Wantedsignal–67Minimuminterfererlevel[2GHz,3GHz](Wantedsignal–67Minimuminterfererlevel>3GHz(Wantedsignal–67MinimuminterfererFrequencyerrorIncludingbothinitialtoleranceanddrift.Sensitivitybetterthan-67dBm,250bytepayload.BER0.1%umpacketlength.Sensitivitybetterthan–67dBm,250bytepayload.BER0.1%1Mbps,GFSK,160-kHzDeviation,0.1%ReceiverBER<0Co-channelWantedsignal10dBabovesensitivityIn-bandblocking±1-MHzoffset,0.1%BER,wantedsignal–672±2-MHzoffset,0.1%BER,wantedsignal–67±3-MHzoffset,0.1%BER,wantedsignal-–67>6-MHzoffset,0.1%BER,wantedsignal–67FrequencyerrorIncludingbothinitialtoleranceanddrift.Sensitivitybetterthan–67dBm,250-bytepayload.BER0.1%umpacketlength.Sensitivitybetterthan–67dBm,250-bytepayload.BER0.1%500kbps,MSK,0.1%ReceiverBER<0Co-channelWantedsignal–67In-bandblocking±1-MHzoffset,0.1%BER,wantedsignal–67±2-MHzoffset,0.1%BER,wantedsignal–67>2-MHzoffset,0.1%BER,wantedsignal–67FrequencyerrorIncludingbothinitialtoleranceanddrift.Sensitivitybetterthan–67dBm,250-bytepayload.BER0.1%Symbolrateerrorumpacketlength.Sensitivitybetterthan–67dBm,250-bytepayload.BER0.1%ThereceiversensitivitysettingisprogrammableusingaTIBLEstackvendor-specificAPIcommand.ThedefaultvalueisstandardResultsbasedonstandard-gainDifferencebetweencenterfrequencyofthereceivedRFsignalandlocaloscillatorDifference ingsymbolrateandtheinternallygeneratedsymbolResultsbasedonhigh-gainTEST250kbps,GFSK,160kHzDeviation,0.1%ReceiversensitivityBER<0Co-channelWantedsignal-67In-bandblocking±1-MHzoffset,0.1%BER,wantedsignal–67±2-MHzoffset,0.1%BER,wantedsignal–67>2-MHzoffset,0.1%BER,wantedsignal–67FrequencyerrorIncludingbothinitialtoleranceanddrift.Sensitivitybetterthan–67dBm,250-bytepayload.BER0.1%umpacketlength.Sensitivitybetterthan–67dBm,250-bytepayload.BER0.1%250kbps,MSK,0.1%ReceiversensitivityBER<0Co-channelWantedsignal-67In-bandblocking±1-MHzoffset,0.1%BER,wantedsignal–67±2-MHzoffset,0.1%BER,wantedsignal–67>2-MHzoffset,0.1%BER,wantedsignal–67FrequencyerrorIncludingbothinitialtoleranceanddrift.Sensitivitybetterthan–67dBm,250-bytepayload.BER0.1%Symbolrateerrorumpacketlength.Sensitivitybetterthan–67dBm,250-bytepayload.BER0.1%ALLSpuriousemissioninRX.Conductedf<1SpuriousemissioninRX.Conductedf>1Resultsbasedonstandard-gainDifferencebetweencenterfrequencyofthereceivedRFsignalandlocaloscillatorDifference ingsymbolrateandtheinternallygeneratedsymbolResultsbasedonhigh-gainRFTRANSMITMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°C,VDD=3Vandfc=2440TEST OutputDeliveredtoasingle-ended50-Ωloadthroughabalunusing mendedoutputpowersetting0Deliveredtoasingle-ended50-Ωloadthroughabalunusing mendedoutputpowersettingProgrammableoutputpowerDeliveredtoasingle-ended50-Ωloadthroughabalunusing mendedoutputpowersettingSpuriousemissionconductedf<1f>1Suitableforsystemstargetingcompliancewithworldwideradio-frequencyregulationsETSIEN300328andEN300440Class2(Europe),FCCCFR47Part15(US),andARIBSTD-T66(Japan)OptimumloadDifferentialimpedanceasseenfromtheRFport(RF_PandRF_N)towardtheantenna70ΩDesignswithantennaconnectorsthatrequireconductedETSIcomplianceat64MHzshouldinsertanLCresonatorinfrontoftheantennaconnector.Usea1.6-nHinductorinparallelwitha1.8-pFcapacitor.ConnectbothfromthesignaltracetoagoodRFground.CURRENTCONSUMPTIONWITHMeasuredonTexasInstrumentsCC2541TPA62730EMreferencedesignwithTA=25°C,VDD=3Vandfc=24401Mbsp,GFSK,250-kHzdeviation,Bluetooth™lowenergyMode,1%TEST CurrentRXmode,standardmode,noperipheralsactive,lowMCUactivity,MCUat1MHzRXmode,high-gainmode,noperipheralsactive,lowMCUactivity,MCUat1MHzTXmode,–20dBmoutputpower,noperipheralsactive,lowMCUactivity,MCUat1MHzTXmode,0dBmoutputpower,noperipheralsactive,lowMCUactivity,MCUat1MHz(1)0.1%BERmapsto30.8%32-MHzCRYSTALMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°CandVDD=3TESTCrystalEquivalentseries6ΩCrystalshunt17CrystalloadStart-upPower-downguardThecrystaloscillatormustbeinpowerdownforaguardtimebeforeitisusedagain.Thisrequirementisvalidforallmodesofoperation.Theneedforpower-downguardtimecanvarywithcrystaltypeandload.3(1)Includingagingandtemperaturedependency,asspecifiedby32.768-kHzCRYSTALMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°CandVDD=3TESTCrystalCrystalfrequencyaccuracyEquivalentseriesCrystalshunt CrystalloadStart-ups(1)Includingagingandtemperaturedependency,asspecifiedby32-kHzRCMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°CandVDD=3TEST CalibratedFrequencyaccuracyafterTemperatureSupply-voltage3Calibration2Thecalibrated32-kHzRCoscillatorfrequencyisthe32-MHzXTALfrequencydividedbyFrequencydriftwhentemperaturechangesaftercalFrequencydriftwhensupplyvoltagechangesafterWhenthe32-kHzRCoscillatorisenabled,itiscalibratedwhenaswitchfromthe16-MHzRCoscillatortothe32-MHzcrystaloscillatorisperformedwhileSLEEPCMD.OSC32K_CALDISissetto0.MHzRCMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°CandVDD=3TEST UncalibratedfrequencyCalibratedfrequencyStart-upInitialcalibrationThecalibrated16-MHzRCoscillatorfrequencyisthe32-MHzXTALfrequencydividedbyWhenthe16-MHzRCoscillatorisenabled,itiscalbratedwhenaswitchfromthe16-MHzRCoscillatortothe32-MHzcrystaloscillatorisperformedwhileSLEEPCMD.OSC_PDissetto0.RSSIMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°CandVDD=3TEST 2Mbps,GFSK,320-kHzDeviation,0.1%BERand2Mbps,GFSK,500-kHzDeviation,0.1%UsefulRSSIReducedgainbyAGCHighgainbyAGCRSSIReducedgainbyAGCHighgainbyAGCAbsoluteuncalbratedStepsize(LSB1AllOtherUsefulRSSIStandardHigh-gainRSSIStandardHigh-gainAbsoluteuncalbratedStepsize(LSB1AssumingCC2541EMreferencedesign.OtherRFdesignsgiveanoffsetfromthereportedFREQUENCYSYNTHESIZERMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°C,VDD=3Vandfc=2440TEST Phasenoise,unmodulatedAt±1-MHzoffsetfromAt±3-MHzoffsetfromAt±5-MHzoffsetfromOGTEMPERATUREMeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°CandVDD=3TEST MeasuredusingintegratedADC,internalband-gapvoltagereference,andumresolution12-TemperatureVoltage10.1InitialaccuracywithoutAccuracyusing1-pointCurrentconsumptionwhenCOMPARATORTA=25°C,VDD=3V.AllmeasurementresultsareobtainedusingtheCC2541referencedesigns,post-TEST TYPCommon- umVCommon-modeminimumInputoffset1OffsetvsOffsetvsoperating4SupplyTA=25°CandVDD=3TESTInputVDDisvoltageonAVDD50VExternalreferenceVDDisvoltageonAVDD50VExternalreferencevoltageVDDisvoltageonAVDD50VInput,Simulatedusing4-MHzclockFull-scalePeak-to-peak,defines0VEffectivenumberofSingle-endedinput,7-bitSingle-endedinput,9-bitSingle-endedinput,10-bitSingle-endedinput,12-bitDifferentialinput,7-bitDifferentialinput,9-bitDifferentialinput,10-bitDifferentialinput,12-bit10-bitsetting,clockedby12-bitsetting,clockedbyUsefulpower7-bitsetting,bothsingleandTotalharmonicSingleendedinput,12-bitsetting,–6SignaltononharmonicSingle-endedinput,12-bitDifferentialinput,12-bitSingle-endedinput,12-bitsetting,–6Common-moderejectionDifferentialinput,12-bitsetting,1-kHzsine(0dBFS),limitedbyADCresolutionSingleendedinput,12-bitsetting,1-kHzsine(0dBFS),limitedbyADCresolutionGainDifferential12-bitsetting,12-bitIntegral12-bitsetting,12-bit12-bitsetting,mean,clockedby12-bitsetting,max,clockedbySignal-to-noise-and-Singleendedinput,7-bitSingleendedinput,9-bitSingleendedinput,10-bitSingleendedinput,12-bitDifferentialinput,7-bitDifferentialinput,9-bitDifferentialinput,10-bitDifferentialinput,12-bitConversion7-bit9-bit10-bit12-bit(1)Measuredwith300-Hzsine-waveinputandVDDasADCCHARACTERISTICSTA=25°CandVDD=3TEST PowerInternalreferenceVDD4InternalreferencetemperatureInternalreferenceVCONTROLINPUTACTA=–40°Cto85°C,VDD=2Vto3.6TESTSystemclock,fSYSCLKtSYSCLK=1/fSYSCLKTheundividedsystemclockis32MHzwhencrystaloscillatorisused.Theundividedsystemclockis16MHzwhencalibrated16-MHzRCoscillatorisused.RESET_NlowSeeitem1,Figure2.Thisistheshortestpulsethatisrecognizedasacompleteresetpinrequest.Notethatshorterpulsesmayberecognizedbutdonotleadtocompleteresetofallmoduleswithinthe1InterruptpulseSeeitem2,Figure2.Thisistheshortestpulsethatisrecognizedasaninterruptrequest.1212Figure2.ControlInputAC

T0299-SPIACTA=–40°Cto85°C,VDD=2Vto3.6TEST TYPSCKMaster,RXandSlave,RXandSCKdutySSNlowtoSCKtoSSNMOSIearlyMaster,load=107MOSIlateMaster,load=10MISOMISOSCKdutyMOSIMOSIMISOlateSlave,load=10OperatingMaster,TX8Master,RXand4Slave,RX8Slave,RXand4 X XXFigure3.SPIMasterAC

X XXFigure4.SPISlaveACDEBUGINTERFACEACTA=–40°Cto85°C,VDD=2Vto3.6TEST Debugclockfrequency(seeFigureAllowedhighpulseonclock(seeFigureAllowedlowpulseonclock(seeFigureEXT_RESET_Nlowtofirstfallingedgeondebugclock(seeFigure7)FallingedgeonclocktoEXT_RESET_Nhigh(seeFigureEXT_RESET_Nhightofirstdebugcommand(seeFigureDebugdatasetup(seeFigure2Debugdatahold(seeFigure4Clock-to-datadelay(seeFigureLoad=10 1/fclkdbgFigure5.DebugClock–Basic

Figure6.DebugEnable

T0437-P2(toP2DEBUG(fromP2Figure7.DataSetupandHoldTIMERINPUTSACTA=–40°Cto85°C,VDD=2Vto3.6TEST InputcapturepulseSynchronizersdeterminetheshortestinputpulsethatcanberecognized.Thesynchronizersoperateatthecurrentsystemclockrate(16MHzor32MHz).DCTA=25°C,VDD=3TESTLogic-inputVLogic-inputVLogic-inputInputequals0Logic-inputInputequalsI/O-pinpullupandpulldownLogic-0outputvoltage,4-mAOutputload4VLogic-1outputvoltage,4-mAOutputload4VLogic-0outputvoltage,20-mAOutputload20VLogic-1outputvoltage,20-mAOutputload20VDEVICEPINTheCC2541pinoutisshowninFigure8andashortdescriptionofthepinsP2_3/P2_3/OSC32K_Q2P2_4/4039383740393837363534334 67Ground 111213141516171819

NOTE:TheexposedgroundpadmustbeconnectedtoaFigure8.PinoutTopPINPINPINPower(2-V–3.6-Vogpower-supplyPower(2-V–3.6-Vogpower-supplyPower(2-V–3.6-Vogpower-supplyPower(2-V–3.6-Vogpower-supplyPower(2-V–3.6-Vogpower-supplyPower(2-V–3.6-Vogpower-supplyPower1.8-Vdigitalpower-supplydecoupling.DonotuseforsupplyingexternalPower2-V–3.6-Vdigitalpower-supplyPower2-V–3.6-Vdigitalpower-supply1GroundConnectto—Thegroundpadmustbeconnectedtoasolidground4UnusedNotDigitalPortDigitalPortDigitalPortDigitalPortDigitalPortDigitalPortDigitalPortDigitalPortDigitalPort1.0–20-mAdrive9DigitalPort1.1–20-mAdrive8DigitalPort7DigitalPort6DigitalPort5DigitalPortDigitalPortDigitalPortDigitalPortDigitalPort2.1/debugDigitalPort2.2/debugDigitalI/O,ogPort2.3/32.768kHzDigitalI/O,ogPort2.4/32.768kHzogExternalprecisionbiasresistorforreferenceDigitalReset,active-RFNegativeRFinputsignaltoLNAduringRXNegativeRFoutputsignalfromPAduringTXRFPositiveRFinputsignaltoLNAduringRXPositiveRFoutputsignalfromPAduringTX2I2CclockordigitalCanbeusedasI2CclockpinordigitalI/O.Leavefloatingifnotused.Ifgroundeddisablepullup3I2CclockordigitalCanbeusedasI2CdatapinordigitalI/O.Leavefloatingifnotused.Ifgroundeddisablepullupog32-MHzcrystaloscillatorpinog32-MHzcrystaloscillatorpinBLOCKAblockdiagramoftheCC2541isshowninFigure9.Themodulescanberoughlydividedintooneofthreecategories:CPU-relatedmodules;modulesrelatedtopower,test,andclockdistribution;andradio-relatedmodules.Inthefollowingsubsections,ashortdescriptionofeachmoduleisgiven.

I/OI/O

ADCAUDIO/DC

Figure9.CC2541BlockBLOCKAblockdiagramoftheCC2541isshowninFigure9.Themodulescanberoughlydividedintooneofthreecategories:CPU-relatedmodules;modulesrelatedtopower,test,andclockdistribution;andradio-relatedmodules.Inthefollowingsubsections,ashortdescriptionofeachmoduleisgiven.CPUandThe8051CPUcoreisasingle-cycle patiblecore.Ithasthreedifferentmemoryaccessbusses(SFR,DATA,andCODE/XDATA),adebuginterface,andan18-inputextendedinterruptunit.Thememoryarbiterisattheheartofthesystem,asitconnectstheCPUandDMAcontrollerwiththephysicalmemoriesandallperipheralsthroughtheSFRbus.Thememoryarbiterhasfourmemory-accesspoints,accessofwhichcanmaptooneofthreephysicalmemories:anSRAM,flashmemory,andXREG/SFRregisters.Itisresponsibleforperformingarbitrationandsequencingbetweensimultaneousmemoryaccessestothesamephysicalmemory.TheSFRbusisdrawnconceptuallyinFigure9asacommonbusthatconnectsallhardwareperipheralstothememoryarbiter.TheSFRbusintheblockdiagramalsoprovidesaccesstotheradioregistersintheradioregisterbank,eventhoughtheseareindeedmappedintoXDATAmemoryspace.The8-KBSRAMmapstotheDATAmemoryspaceandtopartsoftheXDATAmemoryspaces.TheSRAMisanultralow-powerSRAMthatretainsitscontentsevenwhenthedigitalpartispoweredoff(powermode2andmode3).The128/256KBflashblockprovidesin-circuitprogrammablenon-volatileprogrammemoryforthedevice,andmapsintotheCODEandXDATAmemoryspaces.Writingtotheflashblockisperformedthroughaflashcontrollerthatallowswiseerasureand4-bytewiseprogramming.SeeUserGuidefordetailsontheflashcontroller.Aversatilefive-channelDMAcontrollerisavailableinthesystem,accessesmemoryusingtheXDATAmemoryspace,andthushasaccesstoallphysicalmemories.Eachchannel(trigger,priority,transfermode,addressingmode,sourceanddestinationpointers,andtransfercount)isconfiguredwithDMAdescriptorsthatcanbelocatedanywhereinmemory.Manyofthehardwareperipherals(AEScore,flashcontroller,USARTs,timers,ADCinterface,etc.)canbeusedwiththeDMAcontrollerforefficientoperationbyperformingdatatransfersbetweenasingleSFRorXREGaddressandflash/SRAM.EachCC2541containsaunique48-bitIEEEaddressthatcanbeusedasthepublicdeviceaddressforaBluetoothdevice.Designersarefreetousethisaddress,orprovidetheirown,asdescribedintheBluetoothTheinterruptcontrollerservicesatotalof18interruptsources,dividedintosixinterruptgroups,eachofwhichisassociatedwithoneoffourinterruptpriorities.I/Oandsleeptimerinterruptrequestsareservicedevenifthedeviceisinasleepmode(powermodes1and2)bybringingtheCC2541backtotheactivemode.Thedebuginterfaceimplementsaproprietarytwo-wireserialinterfacethatisusedforin-circuitdebugging.Throughthisdebuginterface,itispossibletoeraseorprogramtheentireflashmemory,controlwhichoscillatorsareenabled,stopandstartexecutionoftheuserprogram,executeinstructionsonthe8051core,setcodebreakpoints,andsingle-stepthroughinstructionsinthecode.Usingthesetechniques,itispossibletoperformin-circuitdebuggingandexternalflashprogrammingelegantly.TheI/Ocontrollerisresponsibleforallgeneral-purposeI/Opins.TheCPUcanconfigurewhetherperipheralmodulescontrolcertainpinsorwhethertheyareundersoftwarecontrol,andifso,whethereachpinisconfiguredasaninputoroutputandifapulluporpulldownresistorinthepadisconnected.EachperipheralthatconnectstotheI/OpinscanchoosebetweentwodifferentI/Opinlocationstoensureflexibilityinvariousapplications.Thesleeptimerisanultralow-powertimerthatcaneitheruseanexternal32.768-kHzcrystaloscillatororaninternal32.753-kHzRCoscillator.Thesleeptimerrunscontinuouslyinalloperatingmodesexceptpowermode3.Typicalapplicationsofthistimerareasareal-timecounterorasawake-uptimertogetoutofpowermode1ormode2.Abuilt-inwatchdogtimerallowstheCC2541toresetitselfifthefirmwarehangs.Whenenabledby6- Timer1isa16-bittimerwithtimer/counter/functionality.Ithasaprogrammableprescaler,a16-bitperiodvalue,andfiveindividuallyprogrammablecounter/capturechannels,eachwitha16-bitcomparevalue.Eachofthecounter/capturechannelscanbeusedasaoutputortocapturethetimingofedgesoninputsignals.ItcanalsobeconfiguredinIRgenerationmode,whereitcountstimer3periodsandtheoutputisANDedwiththeoutputoftimer3togeneratemodulatedconsumerIRsignalswithminimalCPUinteraction.Timer2isa40-bittimer.Ithasa16-bitcounterwithaconfigurabletimerperiodanda24-bitoverflowcounterthatcanbeusedtokeeptrackofthenumberofperiodsthathavetranspired.A40-bitcaptureregisterisalsousedtorecordtheexacttimeatwhichastart-of-framedelimiterisreceived/transmittedortheexacttimeatwhichtransmissionends.Therearetwo16-bitoutputcompareregistersandtwo24-bitoverflowcompareregistersthatcanbeusedtogiveexacttimingforstartofRXorTXtotheradioorgeneralinterrupts.Timer3andtimer4are8-bittimerswithtimer/counter/functionality.Theyhaveaprogrammableprescaler,an8-bitperiodvalue,andoneprogrammablecounterchannelwithan8-bitcomparevalue.Eachofthecounterchannelscanbeusedas USART0andUSART1areeachconfigurableaseitheranSPImaster/slaveoraUART.TheyprovidedoublebufferingonbothRXandTXandhardwareflowcontrolandarethuswellsuitedtohigh-throughputfull-duplexapplications.EachUSARThasitsownhigh-precisionbaud-rategenerator,thusleavingtheordinarytimersfreeforotheruses.WhenconfiguredasSPIslaves,theUSARTssampletheinputsignalusingSCKdirectlyinsteadofusingsomeoversamplingscheme,andarethuswell-suitedforhighdatarates.TheAESencryption/decryptioncoreallowstheusertoencryptanddecryptdatausingtheAESalgorithmwith128-bitkeys.TheAEScorealsosupportsECB,CBC,CFB,OFB,CTR,andCBC-MAC,aswellashardwaresupportforCCM.TheADCsupports7to12bitsofresolutionwithacorrespondingrangeofbandwidthsfrom30-kHzto4-kHz,respectively.DCandaudioconversionswithuptoeightinputchannels(I/Ocontrollerpins)arepossible.Theinputscanbeselectedassingle-endedordifferential.Thereferencevoltagecanbeinternal,AVDD,orasingle-endedordifferentialexternalsignal.TheADCalsohasatemperature-sensorinputchannel.TheADCcanautomatetheprocessofperiodicsamplingorconversionoverasequenceofchannels.TheI2Cmoduleprovidesadigitalperipheralconnectionwithtwopinsandsupportsbothmasterandslaveoperation.I2CsupportiscompliantwiththeNXPI2Cspecificationversion2.1andsupportsstandardmode(upto100kbps)andfastmode(upto400kbps).Inaddition,7-bitdeviceaddressingmodesaresupported,aswellasmasterandslavemodes.Theultralow-powerogcomparatorenablesapplicationstowakeupfromPM2orPM3basedonanogsignal.Bothinputsarebroughtouttopins;thereferencevoltagemustbeprovidedexternally.ThecomparatoroutputisconnectedtotheI/OcontrollerinterruptdetectorandcanbetreatedbytheMCUasaregularI/Opin 21TYPICALRX TX 1MbpsGFSK2501MbpsGFSK250kHzStandardGainSettingInput=−70dBmV=3TXPowerSetting=0dBmV=3V CurrentCurrentCurrentCurrent TemperatureFigure

TemperatureFigure

RX TX 1MbpsGFSK1MbpsGFSK250kHzStandardGainSettingV=3VTXPowerSetting=0dBmV=3V LevelLevelLevelLevel TemperatureFigure

TemperatureFigure

CurrentCurrent

RX TX SUPPLY SUPPLYTXPowerSetting=0dBmTXPowerSetting=0dBmT=25°C1MbpsGFSK250kHzStandardGainSettingInput=−70dBmT=CurrentCurrent

Voltage Voltage Figure FigureTYPICALCHARACTERISTICSRX TX SUPPLY SUPPLY1MbpsGFSK250kHzStandardGainSetting1MbpsGFSK250kHzStandardGainSettingT=25°CTXPowerSetting=0dBmT=25°CLevelLevelLevelLevel

3

3 Voltage VoltageFigure Figure

RX TX 1MbpsGFSK1MbpsGFSK250kHzStandardGainSettingT=25°CV=3TXPowerSetting=0dBmT=25°CV=3 LevelLevelLevelLevel 24002410242024302440245024602470FrequencyFigure

24002410242024302440245024602470FrequencyFigure

Table1.OutputTXPOWERTypicalOutputPower0MeasuredonTexasInstrumentsCC2541EMreferencedesignwithTA=25°C,VDD=3Vandfc=2440MHz.SeeSWRU191formendedregistersettings.1Mbsp,GFSK,250-kHzdeviation,Bluetooth™lowenergymode,1%Table2.OutputPowerandCurrentTypicalOutputPowerTyp