Skyworks和Ember ZigBee前端模块参考设计

Skyworks和EmberZigBee前端模块参考设计Ember公司的EM250是单片ZigBee解决方案,集成了2.4GHz,IEEE802.15.4兼容的收发器以及16位XAP2b微处理器,128KB闪存和5KBSRAM存储器与基于ZigBee应用的外设.收发器允许和IEEE802.11g与蓝牙共存,接收灵敏度为-99dBm,输出功率为+3dBm,主要用于建筑物自动化和控制,家庭自动化控制,家庭娱乐控制以及财产跟踪等.本文介绍了EM250的主要特性,方框图和应用电路图与所用材料清单.此外还介绍了采用EM250和Skyworks公司的SKY65335和SKY65337的ZigBee前端模块参考设计的电路图和材料清单(BOM).

TheEM250isasingle-chipsolutionthatintegratesa2.4GHz,IEEE802.15.4-complianttransceiverwitha16-bitXAP2bmicroprocessor.ItcontainsintegratedFlashandRAMmemoryandperipheralsofusetodesignersofZigBee-basedapplications.

ThetransceiverutilizesanefficientarchitecturethatexceedsthedynamicrangerequirementsimposedbytheIEEE802.15.4-2003standardbyover15dB.Theintegratedreceivechannelfilteringallowsforco-existencewithothercommunicationstandardsinthe2.4GHzspectrumsuchasIEEE802.11gandBluetooth.Theintegratedregulator,VCO,loopfilter,andpoweramplifierkeeptheexternalcomponentcountlow.Anoptional

highperformanceradiomode(boostmode)issoftwareselectabletoboostdynamicrangebyafurther3dB.

TheXAP2bmicroprocessorisapower-optimizedcoreintegratedintheEM250.Itsupportstwodifferentmodesofoperation—SystemModeandApplicationMode.TheEmberZNetstackrunsinSystemModewithfullaccesstoallareasofthechip.ApplicationcoderunsinApplicationModewithlimitedaccesstotheEM250resources;thisallowsfortheschedulingofeventsbytheapplicationdeveloperwhilepreventingmodificationofrestrictedareasofmemoryandregisters.Thisarchitectureresultsinincreasedstabilityandreliabilityofdeployedsolutions.

TheEM250has128kBofembeddedFlashmemoryand5kBofintegratedRAMfordataandprogramstorage.

TheEM250softwarestackemploysaneffectivewear-levelingalgorithminordertooptimizethelifetimeoftheembeddedFlash.

TomaintainthestricttimingrequirementsimposedbyZigBeeandtheIEEE802.15.4-2003standard,theEM250integratesanumberofMACfunctionsintothehardware.TheMAChardwarehandlesautomaticACKtransmissionandreception,automaticbackoffdelay,andclearchannelassessmentfortransmission,aswellasautomaticfilteringofreceivedpackets.Inaddition,theEM250allowsfortrueMACleveldebuggingbyintegratingthePacketTraceInterface.

Tosupportuser-definedapplications,anumberofperipheralssuchasGPIO,UART,SPI,I2C,ADC,andgeneralpurposetimersareintegrated.Also,anintegratedvoltageregulator,power-on-resetcircuitry,sleeptimer,andlow-powersleepmodesareavailable.Thedeepsleepmodedrawslessthan1μA,allowingproductstoachievelongbatterylife.

Finally,theEM250utilizesthenon-intrusiveSIFmoduleforpowerfulsoftwaredebuggingandprogrammingoftheXAP2bmicrocontroller.

EM250主要特性:

Integrated2.4GHz,IEEE802.15.4-complianttransceiver:

RobustRXfilteringallowsco-existencewithIEEE802.11gandBluetoothdevices

-99dBmRXsensitivity(1%PER,20bytepacket)

+3dBmnominaloutputpower

Increasedradioperformancemode(boostmode)gives-100dBmsensitivityand+5dBm

transmitpower

IntegratedVCOandloopfilter

IntegratedIEEE802.15.4PHYandlowerMACwithDMA

IntegratedhardwaresupportforPacketTraceInterfaceforInSightDevelopmentEnvironment

ProvidesintegratedRCoscillatorforlowpoweroperation

Supportsoptional32.768kHzcrystaloscillatorforhigheraccuracyneeds

16-bitXAP2bmicroprocessor

Integratedmemory:

128kBofFlash

5kBofSRAM

Configurablememoryprotectionscheme

Twosleepmodes:

Processoridle

Deepsleep—1.0μA(1.5μAwithoptional32.768kHzoscillatorenabled)

SeventeenGPIOpinswithalternatefunctions

TwoSerialControllerswithDMA

SC1:I2Cmaster,SPImaster+UART

SC2:I2Cmaster,SPImaster/slave

Two16-bitgeneral-purposetimers;one16-bitsleeptimer

Watchdogtimerandpower-on-resetcircuitry

Non-intrusivedebuginterface(SIF)

IntegratedAESencryptionaccelerator

IntegratedADCmodulefirst-order,sigmadeltaconverterwith12-bitresolution

Integrated1.8Vvoltageregulator

EM250主要应用:

TargetapplicationsfortheEM250include:

Buildingautomationandcontrol

Homeautomationandcontrol

Homeentertainmentcontrol

Assettracking

图1.EM250方框图

图2.EM250典型应用电路

图2中典型应用电路的材料清单(BOM):

Skyworks和EmberZigBee前端模块参考设计

SkyworksandEmberReferenceDesignforIndustrysFirstPortfolioofFront-EndModulesforZigBee®Applications

SkyworksSolutionsandEmber’sreferencedesignfortheindustry’sfirstportfolioofZigBeefront-endmodulestargetingapplicationssuchassmartmetersinenergymanagement,homeareanetworks(HAN),andindustrialautomation,isnowavailable.

ZigBeeisawirelessnetworkglobalstandardthataddressestheuniqueneedsofremotemonitoringandcontrol,andsensor-networkapplications.WestTechnologyResearchSolutionsisforecastingtheZigBee/IEEE802.15.4markett