MAX6675中文资料

GeneralDescriptionTheMAX6675performscold-junctioncompensationanddigitizesthesignalfromatype-Kthermocouple.Thedataisoutputina12-bitresolution,SPI™-compati-ble,read-onlyformat.Thisconverterresolvestemperaturesto0.25°C,allowsreadingsashighas+1024°C,andexhibitsthermocou-pleaccuracyof8LSBsfortemperaturesrangingfrom0°Cto+700°C.TheMAX6675isavailableinasmall,8-pinSOpackage.ApplicationsIndustrialAppliancesHVACAutomotiveFeaturesDirectDigitalConversionofType-KThermocoupleOutputCold-JunctionCompensationSimpleSPI-CompatibleSerialInterface12-Bit,0.25°CResolutionOpenThermocoupleDetectionMAX6675Cold-Junction-CompensatedK-Thermocouple-to-DigitalConverter(0°Cto+1024°C)________________________________________________________________MaximIntegratedProducts1CSSCKVCC1287N.C.SOT-T+GNDSOTOPVIEW3465MAX6675PinConfigurationVccGNDT+T-SOSCKCSMICROCONTROLLER68HC11A8MISOSCKSSB0.1µFMAX6675TypicalApplicationCircuit19-2235;Rev1;3/02Forpricing,delivery,andorderinginformation,pleasecontactMaxim/DallasDirect!at1-888-629-4642,orvisitMaxim’swebsiteat°Cto+85°C8SOMAX6675Cold-Junction-CompensatedK-Thermocouple-to-DigitalConverter(0°Cto+1024°C)2_______________________________________________________________________________________ABSOLUTEMAXIMUMRATINGSELECTRICALCHARACTERISTICS(VCC=+3.0Vto+5.5V,TA=-20°Cto+85°C,unlessotherwisenoted.Typicalvaluesspecifiedat+25°C.)(Note1)Stressesbeyondthoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.SupplyVoltage(VCCtoGND)................................-0.3Vto+6VSO,SCK,CS,T-,T+toGND.......................-0.3VtoVCC+0.3VSOCurrent........................................................................50mAESDProtection(HumanBodyModel)...........................±2000VContinuousPowerDissipation(TA=+70°C)8-PinSO(derate5.88mW/°Cabove+70°C)..............471mWOperatingTemperatureRange..........................-20°Cto+85°CStorageTemperatureRange............................-65°Cto+150°CJunctionTemperature....................................................+150°CSOPackageVaporPhase(60s)......................................................+215°CInfrared(15s)..............................................................+220°CLeadTemperature(soldering,10s)...............................+300°CPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSVCC=+3.3V-5+5TTHERMOCOUPLE=+700°C,TA=+25°C(Note2)VCC=+5V-6+6VCC=+3.3V-8+8TTHERMOCOUPLE=0°Cto+700°C,TA=+25°C(Note2)VCC=+5V-9+9VCC=+3.3V-17+17TemperatureErrorTTHERMOCOUPLE=+700°Cto+1000°C,TA=+25°C(Note2)VCC=+5V-19+19LSBThermocoupleConversionConstant10.25µV/LSBVCC=+3.3V-3.0+3.0Cold-JunctionCompensationErrorTA=-20°Cto+85°C(Note2)VCC=+5V-3.0+3.0°CResolution0.25°CThermocoupleInputImpedance60kΩSupplyVoltageVCC3.05.5VSupplyCurrentICC0.71.5mAPower-OnResetThresholdVCCrising122.5VPower-OnResetHysteresis50mVConversionTime(Note2)0.170.22sSERIALINTERFACEInputLowVoltageVIL0.3xVCCVInputHighVoltageVIH0.7xVCCVInputLeakageCurrentILEAKVIN=GNDorVCC±5µAInputCapacitanceCIN5pFMAX6675Cold-Junction-CompensatedK-Thermocouple-to-DigitalConverter(0°Cto+1024°C)_______________________________________________________________________________________310864200451530607590OUTPUTCODEERRORvs.AMBIENTTEMPERATUREMAX6675toc01TEMPERATURE(°C)OUTPUTCODEERROR(LSB)-50510-1003050OUTPUTCODEERRORvs.VOLTAGEDIFFERENTIALMAX6675toc02VOLTAGEDIFFERENTIAL(mV)OUTPUTCODEERROR(LSB)102040TypicalOperatingCharacteristics(VCC=+3.3V,TA=+25°C,unlessotherwisenoted.)ELECTRICALCHARACTERISTICS(continued)(VCC=+3.0Vto+5.5V,TA=-20°Cto+85°C,unlessotherwisenoted.Typicalvaluesspecifiedat+25°C.)(Note1)Note1:Allspecificationsare100%testedatTA=+25°C.Specificationlimitsovertemperature(TA=TMINtoTMAX)areguaranteedbydesignandcharacterization,notproductiontested.Note2:Guaranteedbydesign.Notproductiontested.PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOutputHighVoltageVOHISOURCE=1.6mAVCC-0.4VOutputLowVoltageVOLISINK=1.6mA0.4VTIMINGSerialClockFrequencyfSCL4.3MHzSCKPulseHighWidthtCH100nsSCKPulseLowWidthtCL100nsCSBFalltoSCKRisetCSSCL=10pF100nsCSBFalltoOutputEnabletDVCL=10pF100nsCSBRisetoOutputDisabletTRCL=10pF100nsSCKFalltoOutputDataValidtDOCL=10pF100nsMAX6675Cold-Junction-CompensatedK-Thermocouple-to-DigitalConverter(0°Cto+1024°C)4_______________________________________________________________________________________DetailedDescriptionTheMAX6675isasophisticatedthermocouple-to-digi-talconverterwithabuilt-in12-bitanalog-to-digitalcon-verter(ADC).TheMAX6675alsocontainscold-junctioncompensationsensingandcorrection,adigitalcon-troller,anSPI-compatibleinterface,andassociatedcontrollogic.TheMAX6675isdesignedtoworkinconjunctionwithanexternalmicrocontroller(µC)orotherintelligenceinther-mostatic,process-control,ormonitoringapplicatio