ADIADuC702x脉搏血氧仪解决方案

第第页ADIADuC702x脉搏血氧仪解决方案脉搏血氧仪以非介入方式测量血液中的含氧量,包括发射路径,接收路径,显示和背光,数据接口以及音频报警。发射路径包括红光LED,红外光LED和用于驱动LED的DAC。接收路径包括光电二极管传感器,信号调理,模数转换器和处理器。ADI的脉搏血氧仪解决方案采用ADuC7024精密模拟微控制器,具有多达16路的12位1MSPS的ADC和采用ARM7TDMI核16位/32位RISC架构的MCU.本文介绍了ADuC7019/20/21/22/24/25/26/27/28/29主要特性和功能框图,ADuC7024评估板主要特性,电路图和材料清单,以及ADI脉搏血氧仪功能框图及其主要元件表,脉搏血氧仪演示系统框图和所用的主要产品表.TheADuC7019/20/21/22/24/25/26/27/28/29arefullyintegrated,1MSPS,12bitdataacquisitionsystemsincorporatinghighperformancemultichannelADCs,16bit/32bitMCUs,andFlashreg;/EEmemoryonasinglechip.TheADCconsistsofupto12singleendedinputs.AnadditionalfourinputsareavailablebutaremultiplexedwiththefourDACoutputpins.ThefourDACoutputsareavailableonlyoncertainmodels(ADuC7020,ADuC7026,ADuC7028,andADuC7029).However,inmanycaseswheretheDACoutputsarenotpresent,thesepinscanstillbeusedasadditionalADCinputs,givingamaximumof16ADCinputchannels.TheADCcanoperateinsingleendedordifferentialinputmode.TheADCinputvoltageis0VtoVREF.Alowdriftbandgapreference,temperaturesensor,andvoltagecomparatorcompletetheADCperipheralset.Dependingonthepartmodel,uptofourbufferedvoltageoutputDACsareavailableonchip.TheDACoutputrangeisprogrammabletooneofthreevoltageranges.ThedevicesoperatefromanonchiposcillatorandaPLLgeneratinganinternalhighfrequencyclockof41.78MHz(UCLK).ThisclockisroutedthroughaprogrammableclockdividerfromwhichtheMCUcoreclockoperatingfrequencyisgenerated.ThemicrocontrollercoreisanARM7TDMIreg;,16bit/32bitRISCmachine,whichoffersupto41MIPSpeakperformance.EightkilobytesofSRAMand62kilobytesofnonvolatileFlash/EEmemoryareprovidedonchip.TheARM7TDMIcoreviewsallmemoryandregistersasasinglelineararray.OnchipfactoryfirmwaresupportsincircuitserialdownloadviatheUARTorI2Cserialinterfaceport;nonintrusiveemulationisalsosupportedviatheJTAGinterface.ThesefeaturesareincorporatedintoalowcostQuickStartdevelopmentsystemsupportingthisMicroConverterreg;family.Thepartsoperatefrom2.7Vto3.6Vandarespecifiedoveranindustrialtemperaturerangeof40℃to+125℃.Whenoperatingat41.78MHz,thepowerdissipationistypically120mW.TheADuC7019/20/21/22/24/25/26/27/28/29areavailableinavarietyofmemorymodelsandpackages(seeOrderingGuide).ADuC7019/20/21/22/24/25/26/27/28/29主要特性:AnalogI/OMultichannel,12bit,1MSPSADCUpto16ADCchannels1Fullydifferentialandsingleendedmodes0VtoVREFanaloginputrange12bitvoltageoutputDACsUpto4DACoutputsavailable1OnchipvoltagereferenceOnchiptemperaturesensor(3C)VoltagecomparatorMicrocontrollerARM7TDMIcore,16bit/32bitRISCarchitectureJTAGportsupportscodedownloadanddebugClockingoptionsTrimmedonchiposcillator(3%)ExternalwatchcrystalExternalclocksourceupto44MHz41.78MHzPLLwithprogrammabledividerMemory62kBFlash/EEmemory,8kBSRAMIncircuitdownload,JTAGbaseddebugSoftwaretriggeredincircuitreprogrammabilityOnchipperipheralsUART,2I2Creg;andSPIserialI/OUpto40pinGPIOport14generalpurposetimersWakeupandwatchdogtimers(WDT)Powersupplymonitor3phase,16bitPWMgenerator1Programmablelogicarray(PLA)Externalmemoryinterface,upto512kB1PowerSpecifiedfor3VoperationActivemode:11mA@5MHz,40mA@41.78MHzPackagesandtemperaturerangeFrom40lead6mm6mmLFCSPto80leadLQFP1Fullyspecifiedfor40℃to+125℃operationToolsLowcostQuickStartdevelopment