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ID:3402865
大小:161.00 KB
页数:14页
时间:2017-11-21
《字式温湿度检测系统的设计的中英文文献》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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–
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