Ember EM260 ZigBee網(wǎng)絡處理方案

EmberEM260ZigBee網(wǎng)絡處理方案Ember公司的EM260是ZigBee/802.15.4網(wǎng)絡處理器,它集成了2.4GHz,IEEE802.15.4兼容的收發(fā)器和16位網(wǎng)絡處理器(XAP2b內(nèi)核),用以運行ZigBee兼容的網(wǎng)絡堆棧EmberZNet.收發(fā)器的RX靈敏度為-99dBm,正常輸出功率為+2.5dBm.EM260目標應用為建筑物自動化和控制,家庭自動化和控制,家庭娛樂控制以及資產(chǎn)跟蹤.本文介紹了EM260的主要特性,方框圖,典型應用電路和所用的材料清單.此外還介紹了EmberEM260SPI/UART128kB開發(fā)板的主要特性和詳細電路圖,包括電源分布和各種電路,主微控制器,信號流程圖,SPI/UART和USB/DEI邏輯以及USB,DEI,和TTL外接口電路圖.

EM260:ZigBee/802.15.4NetworkProcessor

TheEM260integratesa2.4GHz,IEEE802.15.4-complianttransceiverwitha16-bitnetworkprocessor(XAP2bcore)torunEmberZNet,theEmberZigBee-compliantnetworkstack.TheEM260exposesaccesstotheEmberZNetAPIacrossastandardSPImoduleoraUARTmodule,allowingapplicationdevelopmentonaHostplatform.ThismeansthattheEM260canbeviewedasaZigBeeperipheralconnectedoveraserialinterface.TheXAP2bmicroprocessorisapower-optimizedcoreintegratedintheEM260.ItcontainsintegratedFlashandRAMmemoryalongwithanoptimizedperipheralsettoenhancetheoperationofthenetworkstack.

ThetransceiverutilizesanefficientarchitecturethatexceedsthedynamicrangerequirementsimposedbytheIEEE802.15.4-2003standardbyover15dB.Theintegratedreceivechannelfilteringallowsforco-existencewithothercommunicationstandardsinthe2.4GHzspectrumsuchasIEEE802.11gandBluetooth.Theintegratedregulator,VCO,loopfilter,andpoweramplifierkeeptheexternalcomponentcountlow.Anoptionalhigh-performanceradiomode(boostmode)issoftwareselectabletoboostdynamicrangebyafurther3dB.

TheEM260containsembeddedFlashandintegratedRAMforprogramanddatastorage.Byemployinganeffectivewear-levelingalgorithm,thestackoptimizesthelifetimeoftheembeddedFlash,andaffordstheapplicationtheabilitytoconfigurestackandapplicationtokenswithintheEM260.

TomaintainthestricttimingrequirementsimposedbyZigBeeandtheIEEE802.15.4-2003standard,theEM260integratesanumberofMACfunctionsintothehardware.TheMAChardwarehandlesautomaticACKtransmissionandreception,automaticbackoffdelay,andclearchannelassessmentfortransmission,aswellasautomaticfilteringofreceivedpackets.Inaddition,theEM260allowsfortrueMACleveldebuggingbyintegratingthePacketTraceInterface.

Anintegratedvoltageregulator,power-on-resetcircuitry,sleeptimer,andlow-powersleepmodesareavailable.Thedeepsleepandpowerdownmodesdrawlessthan1μA,allowingproductstoachievelongbatterylife.

Finally,theEM260utilizesthenon-intrusiveSIFmoduleforpowerfulsoftwaredebuggingandprogrammingofthenetworkprocessor.

EM260主要特性:

Integrated2.4GHz,IEEE802.15.4-complianttransceiver:

RobustRXfilteringallowsco-existencewithIEEE802.11gandBluetoothdevices

-99dBmRXsensitivity(1%PER,20bytepacket)

+2.5dBmnominaloutputpower

Increasedradioperformancemode(boostmode)gives–100dBmsensitivityand+4.5dBmtransmitpower

IntegratedVCOandloopfilter

SecondaryTX-onlyRFportforapplicationsrequiringexternalPA.

IntegratedIEEE802.15.4PHYandMAC

EmberZigBee-compliantstackrunningonthededicatednetworkprocessor

ControlledbytheHostusingtheEmberZNetSerialProtocol(EZSP)

StandardSPIorUARTInterfacesallowforconnectiontoavarietyofHostmicrocontrollers

Non-intrusivedebuginterface(SIF)

IntegratedhardwareandsoftwaresupportforInSightDevelopmentEnvironment

Dedicatedperipheralsandintegratedmemory

ProvidesintegratedRCoscillatorforlowpoweroperation

Threesleepmodes:

Processoridle(automatic)

Deepsleep—1.0μA

Powerdown—1.0μA

Watchdogtimerandpower-on-resetcircuitry

IntegratedAESencryptionaccelerator

Integrated1.8Vvoltageregulator

EM260目標應用:

Buildingautomationandcontrol

Homeautomationandcontrol

Homeentertainmentcontrol

Assettracking

圖1.EM260方框圖

圖2.用于SPI協(xié)議的典型應用電路圖

材料清單(BOM):

EmberEM260SPI/UART128kB開發(fā)板

TheEmberEM260SPI/UART128kBBreakoutBoardcontainsthehardwarestimulusforthedevelopmentanddeploymentofalow-data-rate,low-powerZigBeeapplicationonahostmicrocontroller(with128kBofFlash)communicatingwiththeEM260SPI/UARTradiocommunicationmodule(RCM).TheBreakoutBoardallowsforeitheraSPIorUARTinterfacetotheEM260,selectableviaatoggleswitch.Thefour-layer(FR4)BreakoutBoardfeaturesanAtmelhostmicrocontroller(ATmega128L),atemperaturesensor,twoapplicationbuttons,apiezobuzzer,twoapplicationLEDs,anda2吋″x2.6″through-holeprototypingarea.Inaddition,itcontainsaUSBinterface,InSightdataemulationinterface,regulatedpowerplaneswithindicatorLEDs,anddirectattachmenttotheEM260SPI/UARTRCM.ThesefeaturesallowforproperdevelopmentofanEM260application.

TheEM260SPI/UART128kBBreakoutBoardoffers:

Hostmicrocontroller,ATmega128LfromAtmel,with128kBFlashand8kBRAM

AVRISPandJTAGshroudedconnectorsforprogramminganddebug

Configurablehardwaresupportforapplicationdevelopment

Temperaturesensor

Twobuttons

Piezobuzzer

TwoLEDs

SelectableUSBconnectorwithRS-232transceiver

EM260SPI/UARTRCMresetbutton

Hostmicrocontrollerresetbutton

Hostmicrocontrollerbootloadbutton

2″x2.6″,0.1″pitchprototypingarea

26-pin,0.1″pitch,single-rowheaderforaccesstoallhostGPIOsignals

26-pin,0.1″pitch,single-rowEM260SPI/UARTRCMconnectors

26-pin,0.1″pitch,single-rowheadersforaccesstoEZSPsignals

9-pin,0.1″pitch,single-rowheaderfootprintforaccessto3.3VTTL-compliant

UARTsignals

26-pin,low-profileInSightdataemulationinterfacewithconfigurationheader

AutomaticDCpowersourceselection(12VDCwallwart,5VUSBbuspower,orAAA

batterypack)

Powerindi