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1、附录二外文资料翻译资料原文DS18B20ProgrammableResolution1-WireDigitalThermometerDESCRIPTIONTheDS18B20DigitalThermometerprovides9to12–bitcentigradetemperaturemeasurementsandhasanalarmfunctionwithnonvolatileuser-programmableupperandlowertriggerpoints.TheDS18B20communicatesovera1-Wirebusthatbydefinit
2、ionrequiresonlyonedataline(andground)forcommunicationwithacentralmicroprocessor.Ithasanoperatingtemperaturerangeof–55℃to+125°Candisaccurateto±0.5℃overtherangeof–10℃to+85℃.Inaddition,theDS18B20canderivepowerdirectlyfromthedataline(“parasitepower”),eliminatingtheneedforanexternalpowers
3、upply.EachDS18B20hasaunique64-bitserialcode,whichallowsmultipleDS18B20stofunctiononthesame1–wirebus;thus,itissimpletouseonemicroprocessortocontrolmanyDS18B20sdistributedoveralargearea.ApplicationsthatcanbenefitfromthisfeatureincludeHVACenvironmentalcontrols,temperaturemonitoringsyste
4、msinsidebuildings,equipmentormachinery,andprocessmonitoringandcontrolsystems.OVERVIEWFigure1showsablockdiagramoftheDS18B20,andpindescriptionsaregiveninTable1.The64-bitROMstoresthedevice’suniqueserialcode.Thescratchpadmemorycontainsthe2-bytetemperatureregisterthatstoresthedigitaloutpu
5、tfromthetemperaturesensor.Inaddition,thescratchpadprovidesaccesstothe1-byteupperandloweralarmtriggerregisters(THandTL),andthe1-byteconfigurationregister.Theconfigurationregisterallowstheusertosettheresolutionofthetemperature-to-digitalconversionto9,10,11,or12bits.TheTH,TLandconfigura
6、tionregistersarenonvolatile(EEPROM),sotheywillretaindatawhenthedeviceispowereddown.TheDS18B20usesDallas’exclusive1-Wirebusprotocolthatimplementsbuscommunicationusingonecontrolsignal.Thecontrollinerequiresaweakpullupresistorsincealldevicesarelinkedtothebusviaa3-stateoropen-drainport(t
7、heDQpininthecaseoftheDS18B20).Inthisbussystem,themicroprocessor(themasterdevice)identifiesandaddressesdevicesonthebususingeachdevice’sunique64-bitcode.Becauseeachdevicehasauniquecode,thenumberofdevicesthatcanbeaddressedononebusisvirtuallyunlimited.The1-Wirebusprotocol,includingdetail
8、edexplanatio
