仓库温湿度监控系统外文翻译_精品文档.docx

仓库温湿度监控系统外文翻译_精品文档.docx

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江汉大学毕业论文（设计）

外文翻译

姓名

学号

2012年3月1日

外文原文

Singlechipmicrocomputerandthedevelopmentofthetemperatureandhumiditysensor

Borninthe1970ssinglechipmicrocomputer,andexperiencetheSCM,MCU,SOCthreephases.

（1）SCMnamelySingleChipcomputerstage,mainistoseekoutthemonolithicformsoftheembeddedsystembestsystemstructure."Innovationmode"success,laidtheSCMandgeneralcomputercompletelydifferentdevelopmentroad.

（2）MCUnamelyMicroController（MicroControllerUnit）stage,themaintechnologicaldevelopmentdirectionis:

expandingmeetembeddedapplication,theobjectsystemrequirementsofvariousperipheralcircuitandinterfacecircuit,dashforwardshowitsobjecttheintelligentcontrolability.

（3）MCUisembeddedsystemindependentdevelopmentway,toakeyfactortothedevelopmentofMCUstage,istoseekapplicationsystemonachipinthemaximizationofthesolution;Therefore,specialMCUdevelopmentnaturalformtheSOCtendency.Withmicroelectronicstechnology,ICdesign,EDAtoolsdevelopment,basedonthesinglechipmicrocomputerapplicationsystemSOCdesigncanhavelargerdevelopment.

Temperatureisabasicphysicalquantities,everythinginnatureiscloselyrelatedwiththeprocessoftemperature.Thetemperaturesensoristheearliestdevelopment,themostwidelyusedkindofsensor.From17thcenturypeoplebegantousetemperaturemeasuring.Thetemperaturesensortherearefourmaintypes:

thermocouple,thermalresistance,resistancetemperaturedetector（RTD）andtemperaturesensorIC.ICtemperaturesensorandincludinganalogoutputanddigitaloutputtwotypes.Contacttemperaturesensordetectionpartandthetestedobjecthasagoodcontact,andcallsthethermometer.Thethermometerthroughthetransmissionorconvectionreachthermalequilibrium,thusmakethethermometerandvaluecanbemeasureddirectlysaysthetemperatureoftheobjects.Generalmeasurementprecision.Inacertaintemperaturerange,thethermometercanalsobemeasuringobjectsofinternaltemperaturedistribution.Butforsportsbody,smalltargetorheatcapacityisverysmallobjectswillproducelargermeasurementerror,commonlyusedathermometerhavetwo-metalthermometer,glassliquidthermometer,pressuretypethermometer,resistancethermometers,thermistorsandtemperaturedifferenceelectricdipole,etc.Contactlesstemperaturesensorsensitivecomponentsandtestedobjecteachotherisnotcontact,againsaynon-contacthighlighted.ittable.Thisinstrumentcanbeusedtomeasuremovementobject,smallgoalsandheatcapacitysmallortemperaturechangequickly（transient）thesurfacetemperatureoftheobject,alsocanusedforthemeasurementofthetemperaturedistribution.

1.AT89S52devicesprofile

Themainperformance:

andMCS-51SCMproductscompatible,and8KbytesinthesystemprogrammableFlashmemory,1000timeperiod,andthestaticintegration.itoperation:

0Hz~33Hz,level3encryptionprogrammemory,32programmableI/Omouthline,three16timer/counters,eightinterruptsource,full-duplexUARTserialchannel,lowpowerdissipationpowerlostmode,andfreeafterpoweroffinterruptcanwakeup,thewatchdogtimer,doubledatapointer,offtheidentifier.

Functionalcharacteristicsdescription:

AT89S52devicesisalowpower,high-performanceCMOS8-bitmicrocontrollers,with8KinsystemprogrammableFlashmemory.Atmelcompanyusehigh-densitynonvolatiletechnologymanufacturing,andindustry80C51productinstructionsandpinfullycompatible.ChipFlashallowprogrammemoryinthesystemprogrammable,alsosuitableforconventionalprogrammingconsole.Inasinglechip,withclever8bitsCPUandinthesystemprogrammableFlash,makeAT89S52devicesformanyembeddedcontrolsystemtoprovidehighflexibleapplication,superefficientsolution.AT89S52deviceshasthefollowingstandardfunction:

8kbytesFlash,256bytesRAM,32bitI/Omouthline,thewatchdogtimer,twodatapointer,three16timer/counter,a6vectorlevel2interruptstructure,full-duplexserialmouth,withincrystalsoftimelyclockcircuit.Inaddition,AT89S52devicescanbedownto0Hzseriesstaticlogicoperation,supporttwosoftwarecanchoosepowersavingmode.Idlemode,theCPUtostopworking,andallowRAM,timer/counter,serialports,interruptcontinuetoworkfor.Powerlostprotectionways,aRAMcontentbeingsaved,hasbeenfrozen,SCMallworkstop,untilthenextaninterruptorhardwareresetsofar.

2.IntegratedtemperaturesensorAD590

IntegratedtemperaturesensorAD590to,itstemperatureresolutionforthe0.3degreesCelsius.TheanalogsignalisoutputAD590to,whenthetemperatureof0degrees,outputcurrent273.2microamps,andcurrentvariationandtemperaturevariationinalinearrelationship,temperature,an