文档介绍：DS18B20ProgrammableResolution1-WireDigitalThermometerFEATURES􀂃*Unique1-Wire®munication􀂃*EachDevicehasaUnique64-BitSerialCodeStoredinanOn-BoardROM􀂃*MultidropCapabilitySimplifiesDistributedTemperature-SensingApplications􀂃*ponents􀂃*CanBePoweredfromDataLine;􀂃*MeasuresTemperaturesfrom-55°Cto+125°C(-67°Fto+257°F)*±°uracyfrom-10°Cto+85°C􀂃*ThermometerResolutionisUserSelectablefrom9to12Bits􀂃*ConvertsTemperatureto12-BitDigitalWordin750ms(Max)􀂃*User-DefinableNonvolatile(NV)AlarmSettings􀂃*mandIdentifiesandAddressesDevicesWhoseTemperatureisOutsideProgrammedLimits(TemperatureAlarmCondition)􀂃*Availablein8-PinSO(150mils),8-PinμSOP,and3-PinTO-92Packages􀂃*patiblewiththeDS1822􀂃*ontrols,IndustrialSystems,ConsumerProducts,Thermometers,orAnyThermallySensitiveSystemDESCRIPTIONTheDS18B20DigitalThermometerprovides9to12–bitcentigradetemperaturemeasurementsandhasanalarmfunctionwithnonvolatileuser--wirebusthatbydefinitionrequiresonlyonedataline(andground)–55°Cto+125°°Covertherangeof–10°Cto+85°,theDS18B20canderivepowerdirectlyfromthedataline(“parasitepower”),-bitserialcode,whichallowsmultipleDS18B20stofunctiononthesame1–wirebus;thus,itissimpletouseonemic