字式温湿度检测系统的设计的中英文文献

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1、附录：外文资料与中文翻译外文资料：DS1820FEATURES•Unique1–WireTMinterfacerequiresonlyoneportpinforcommunication•Multidropcapabilitysimplifiesdistributedtemperaturesensingapplications•Requiresnoexternalcomponents•Canbepoweredfromdataline•Zerostandbypowerrequired•Measurestemperaturesfrom–55

2、°Cto+125°Cin0.5°Cincrements.Fahrenheitequivalentis–67°Fto+257°Fin0.9°Fincrements•Temperatureisreadasa9–bitdigitalvalue.•Convertstemperaturetodigitalwordin200ms(typ.)•User–definable,nonvolatiletemperaturealarmsettings•Alarmsearchcommandidentifiesandaddressesdeviceswhosete

3、mperatureisoutsideofprogrammedlimits(temperaturealarmcondition)•Applicationsincludethermostaticcontrols,industrialsystems,consumerproducts,thermometers,oranythermallysensitivesystemDESCRIPTIONTheDS1820DigitalThermometerprovides9–bittemperaturereadingswhichindicatethetemp

4、eratureofthedevice.Informationissentto/fromtheDS1820overa1–Wireinterface,sothatonlyonewire(andground)needstobeconnectedfromacentralmicroprocessortoaDS1820.Powerforreading,writing,andperformingtemperatureconversionscanbederivedfromthedatalineitselfwithnoneedforanexternalp

5、owersource.BecauseeachDS1820containsauniquesiliconserialnumber,multipleDS1820scanexistonthesame1–Wirebus.Thisallowsforplacingtemperaturesensorsinmanydifferentplaces.ApplicationswherethisfeatureisusefulincludeHVACenvironmental14controls,sensingtemperaturesinsidebuildings,

6、equipmentormachinery,andinprocessmonitoringandcontrol.DETAILEDPINDESCRIPTIONOVERVIEWTheblockdiagramofFigure1showsthemajorcomponentsoftheDS1820.TheDS1820hasthreemaindatacomponents:1)64–bitlaseredROM,2)temperatureandsensor,3)nonvolatiletemperaturealarmtriggersTHandTL.Thede

7、vicederivesitspowerfromthe1–Wirecommunicationlinebystoringenergyonaninternalcapacitorduringperiodsoftimewhenthesignallineishighandcontinuestooperateoffthispowersourceduringthelowtimesofthe1–Wirelineuntilitreturnshightoreplenishtheparasite(capacitor)supply.Asanalternative

8、,theDS1820mayalsobepoweredfromanexternal5voltssupply.CommunicationtotheDS1820isviaa1–Wireport.Withthe1–