Atmel AT86RF212低功耗ZigBee收发方案

AtmelAT86RF212低功耗ZigBee收发方案Atmel公司的AT86RF212是低功耗低电压700/800/900MHz收发器,特别设计用于IEEEStandard802.15.4,ZigBee,6LoWPAN以及高数据速率ISM应用.AT86RF212单片RF收发器提供了天线和微控制器间完整接口,包括有模拟无线电部分,包括时间和频率同步的数字调制和解调,以及数据缓冲功能.接收灵敏度高达-110dBm,可编程TX输出功率高达+10dBm,工作电压从1.8V到3.6V,内部有电压稳压器和电池监视器,工作温度-40度C到85度C.本文介绍了AT86RF212的主要特性和方框图,以及基本应用电路图和所用的材料清单.此外还介绍了扩展特性应用电路图.

TheAT86RF212isalow-power,low-voltage700/800/900MHztransceiverspecially

designedfortheIEEEStandard802.15.4,ZigBee,6LoWPAN,andhighdatarateISM

applications.Forthesub-1GHzbands,itsupportslowdatarates(20and40kbit/s)of

theIEEEStandard802.15.4-2003[2]andprovidesoptionaldatarates(100and250

kbit/s)usingO-QPSK,accordingtotheIEEEStandard802.15.4-2006[1]andthe

respectiveIEEEP802.15.4cDraftAmendment[3].Furthermore,proprietaryHighData

RateModesupto1000kbit/scanbeemployed.

TheAT86RF212isatrueSPI-to-antennasolution.RF-criticalcomponentsexceptthe

antenna,crystal,andde-couplingcapacitorsareintegratedon-chip.MACandAES

hardwareacceleratorsimproveoverallsystempowerefficiencyandtiming.

TheAT86RF212single-chipRFtransceiverprovidesacompleteradiointerface

betweentheantennaandthemicrocontroller.Itcomprisestheanalogradiopart,digital

modulationanddemodulationincludingtimeandfrequencysynchronization,aswellas

databuffering.Thenumberofexternalcomponentsisminimizedsothatonlythe

antenna,afilter(athighoutputpowerlevels),thecrystal,andfourbypasscapacitors

arerequired.ThebidirectionaldifferentialantennapinsareusedincommonforRXand

TX,i.e.noexternalantennaswitchisneeded.Controlofanexternalpoweramplifieris

supportedbytwodigitalcontrolsignals(differentialoperation).

Thereceiverpathisbasedonalow-IFarchitecture.Afterchannelfilteringanddownconversionthelow-IFsignalissampledandappliedtothedigitalsignalprocessingpart.Communicationbetweentransmitterandreceiverisbasedondirectsequencespreadspectrumwithdifferentmodulationschemesandspreadingcodes.TheAT86RF212supportstheIEEE802.15.4-2006standardmandatoryBPSKmodulationandoptionalO-QPSKmodulationinthe868.3MHzand915MHzbands.InadditionitsupportstheO-QPSKmodulationdefinedinIEEEP802.15.4cfortheChinese780MHzband.

ForapplicationsnotnecessarilytargetingIEEEcompliantnetworkstheradiotransceiversupportsproprietaryHighDataRateModesbasedonO-QPSK.Asingle128byteTRXbufferstoresreceiveortransmitdata.TheAT86RF212featureshardwaresupported128bitsecurityoperation.ThestandaloneAESencryption/decryptionenginecanbeaccessedinparalleltoallPHYoperationalmodes.ConfigurationoftheAT86RF212,reading,andwritingofdatamemoryaswellastheAEShardwareenginearecontrolledbytheSPIinterfaceandadditionalcontrolsignals.

On-chiplow-dropoutvoltageregulatorsprovidetheanaloganddigital1.8Vpowersupply.ControlregistersretaintheirsettingsinSLEEPmodewhentheregulatorsareturnedoff.TheRXandTXsignalprocessingpathsarehighlyintegratedandoptimizedforlowpowerconsumption.

AT86RF212主要特性:

FullyIntegrated700/800/900MHz-BandTransceiver

ChineseWPANBandfrom779to787MHz

EuropeanSRDBandfrom863to870MHz

NorthAmericanISMBandfrom902to928MHz

DirectSequenceSpreadSpectrumwithDifferentModulationSchemesandDataRates

BPSKwith20and40kbit/s,complianttoIEEE802.15.4-2006

O-QPSKwith100and250kbit/s,complianttoIEEE802.15.4-2006

O-QPSKwith250kbit/s,complianttoIEEEP802.15.4c

O-QPSKwith200,400,500,and1000kbit/sPSDUDataRate

FlexibleCombinationofFrequencyBandsandDataRates

IndustryLeadingLinkBudget

ReceiverSensitivityupto-110dBm

ProgrammableTXOutputPowerupto+10dBm

LowPowerSupplyVoltagefrom1.8Vto3.6V

InternalVoltageRegulatorsandBatteryMonitor

LowCurrentConsumption

SLEEP=0.2μA

TRX_OFF=0.4mA

RX_ON=9.0mA

BUSY_TX=18mAatPTX=5dBm

DigitalInterface

Registers,FrameBuffer,andAESAccessiblethroughSPI

ClockOutputwithConfigurableRate

RadioTransceiverFeatures

AdjustableReceiverSensitivity

IntegratedTX/RXSwitch,LNA,andPLLLoopFilter

FastSettlingPLLSupportingFrequencyHopping

AutomaticVCOandFilterCalibration

Integrated16MHzCrystalOscillator

128byteFIFOforTransmit/Receive

IEEE802.15.4-2006HardwareSupport

FCSComputationandCheck

ClearChannelAssessment

ReceivedSignalStrengthIndicator,EnergyDetection,andLinkQualityIndication

MACHardwareAccelerator

AutomaticAcknowledgementandRetransmission

CSMA-CAandLBT

AutomaticFrameFiltering

AES128bitHardwareAccelerator(ECBandCBCmodes)

ExtendedFeatureSetHardwareSupport

TrueRandomNumberGenerationforSecurityApplications

TX/RXIndication(ExternalRFFrontEndControl)

OptimizedforLowBoMCostandEaseofProduction

LowExternalComponentCount:Antenna,ReferenceCrystal,andBypassCapacitors

ExcellentESDRobustness

IndustrialTemperatureRangefrom-40°Cto+85°C

32-pinLow-profileLead-freePlasticQFNPackage,5.0