ADIADu706x高性能热电耦温度监视方案

ADIADu706x高性能热电耦温度监视方案关键字：工业控制,温度监控,数据采集,ADCADI公司的ADu706x是全集成8kSPS取样速率24位数据采集系统,包括了高性能多路Sigma-Delta(Σ-Δ)模数转换器(ADC),16位/32位ARM7TDMI®MCU以及闪存/电可改写(EE)存储器.ADC具有2个差分对或4个单端通路,PGA(1-512)输入级,可选择输入范围从±2.34mV到±1.2V,噪音30nVrms,主要用在工业自动化和过程控制,智能的精密的传感系统,基于4mA-20mA的智能传感器.本文介绍了ADuC706x主要特性,方框图和模拟方框图,以及采用精密模拟微控制器ADu7061/ADu7062的基于USB带冷结点补偿的热电耦温度监视器的应用电路和材料清单.TheADuC706xseriesarefullyintegrated,8kSPS,24-bitdataacquisitionsystemsincorporatinghighperformancemultichannelsigma-delta(Σ-Δ)analog-to-digitalconverters(ADCs),16-bit/32-bitARM7TDMI®MCU,andFlash/EEmemoryonasinglechip.TheADCsconsistofaprimaryADCwithtwodifferentialpairsorfoursingle-endedchannelsandanauxiliaryADCwithuptosevenchannels.TheADCsoperateinsingle-endedordifferentialinputmode.Asingle-channelbufferedvoltageoutputDACisavailableonchip.TheDACoutputrangeisprogrammabletooneoffourvoltageranges.Thedevicesoperatefromanon-chiposcillatorandaPLLgene-ratinganinternalhighfrequencyclockupto10.24MHz.ThemicrocontrollercoreisanARM7TDMI,16-bit/32-bitRISCmachineofferingupto10MIPSpeakperformance;4kBofSRAMand32kBofnonvolatileFlash/EEmemoryareprovidedonchip.TheARM7TDMIcoreviewsallmemoryandregistersasasinglelineararray.TheADuC706xcontainsfourtimers.Timer1isawake-uptimerwiththeabilitytobringthepartoutofpowersavingmode.Timer2isconfigurableasawatchdogtimer.A16-bitPWMwithsixoutputchannelsisalsoprovided.TheADuC706xcontainsanadvancedinterruptcontroller.Thevectoredinterruptcontroller(VIC)allowseveryinterrupttobeassignedaprioritylevel.ItalsosupportsnestedinterruptstoamaximumlevelofeightperIRQandFIQ.WhenIRQandFIQinterruptsourcesarecombined,atotalof16nestedinterruptlevelsissupported.On-chipfactoryfirmwaresupportsin-circuitserialdownloadviatheUARTserialinterfaceportsandnonintrusiveemulationviatheJTAGinterface.Thepartsoperatefrom2.375Vto2.625Voveranindustrialtemperaturerangeof−40℃to+125℃.ADuC706x主要特性:Analoginput/outputDual(24-bit)ADCsSingle-endedanddifferentialinputsProgrammableADCoutputrate(4Hzto8kHz)ProgrammabledigitalfiltersBuilt-insystemcalibrationLowpoweroperationmodePrimary(24-bit)ADCchannel2differentialpairsor4single-endedchannelsPGA(1to512)inputstageSelectableinputrange:±2.34mVto±1.2V30nVrmsnoiseAuxiliary(24-bit)ADC:4differentialpairsor7single-endedchannelsOn-chipprecisionreference(±10ppm/℃)Programmablesensorexcitationcurrentsources200μAto2mAcurrentsourcerangeSingle14-bitvoltageoutputDACMicrocontrollerARM7TDMIcore,16-/32-bitRISCarchitectureJTAGportsupportscodedownloadanddebugMultipleclockingoptionsMemory32kB(16kB×16)Flash/EEmemory,including2kBkernel4kB(1kB×32)SRAMToolsIn-circuitdownload,JTAGbaseddebugLowcost,QuickStart™developmentsystemCommunicationsinterfacesSPIinterface(5Mbps)4-bytereceiveandtransmitFIFOsUARTserialI/OandI2C(master/slave)On-chipperipherals4×general-purpose(capture)timersincludingWake-uptimerWatchdogtimerVectoredinterruptcontrollerforFIQandIRQ8prioritylevelsforeachinterrupttypeInterruptonedgeorlevelexternalpininputs16-bit,6-channelPWMGeneral-purposeinputs/outputsUpto14GPIOpinsthatarefully3.3VcompliantPowerAVDD/DVDDspecifiedfor2.5V(±5%)Activemode:2.74mA(@640kHz,ADC0active)10mA(@10.24MHz,bothADCsactive)PackagesandtemperaturerangeFullyspecifiedfor−40℃to+125℃operation32-leadLFCSP(5mm×5mm)48-leadLFCSPandLQFPDerivatives32-leadLFCSP(ADuC7061)48-leadLQFPand48-leadLFCSP(ADuC7060)ADuC706x应用:IndustrialautomationandprocesscontrolIntelligent,precisionsensingsystems,4mAto20mAloop-basedsmartsensors图1.ADuC706x功能方框图图2.ADuC706x模拟方框图采用精密模拟微控制器的基于USB带冷结点补偿的热电耦温度监视器ThiscircuitusestheADuC7060/ADuC7061precisionanalogmicrocontrollerinanaccuratethermocoupletemperaturemonitoringapplication.TheADuC7060/ADuC7061integratesdual24-bitΣ-ΔADCs,dualprogrammablecurrentsources,a14-bitDAC,anda1.2Vinternalreference,aswellasanARM7core,32kBflash,4kBSRAM,andvariousdigitalperipheralssuchasUART,timers,SPI,andI2Cinterfaces.Inthecircuit,theADuC7060/ADuC7061isconnectedtoathermocoupleanda100ΩPtRTD.TheRTDisusedforcoldjunctioncompensation.Inthesourcecode,anADCsamplingrateof100Hzischosen.WhentheADCinputPGAisconfiguredforagainof32,thenoisefreecoderesolutionoftheADuC7060/ADuC7061isgreaterthan18bits.USB-BasedThermocoupleTemperatureMonitorwithColdJunctionCompensationUsingtheADuC7060/ADuC7061PrecisionAnalogMicrocontroller(CN0214)图3.ADuC706x温度监视控制器器热电耦接口图4.EVAL-ADUC7061MKZ评估板外形图图5.EVAL-ADUC7061MKZ评估板电路图(1)AO-Electronics傲壹电子官网：中文网：评估板电路图(2)图7.EVAL-ADUC7061MKZ评估板测试建立框图ALPSADIIRJRC/NJRKECOTAXSeoulSemiconductorTIWalsinTechnology