MAX31855中文手册

MAX31855冷端补偿热电偶至数字输出转换器概述MAX31855具有冷端补偿，将K、J、N、T或E型热电偶信号转换成数字量(如果使用S和R型热电偶，请联系工厂)。器件输出14位带符号数据，通过SPITM兼容接口、以只读格式输出。转换器的温度分辨率为0.25℃，最高温度读数为+1800℃，最低温度读数为-270℃，对于K型热电偶，温度范围为-200℃至+700℃，保持±2℃精度。对于整个量程范围的精度及其它类型的热电偶，请参考ThermalCharacteristics规格。应用工业电器设备HVAC汽车典型应用电路19-5793;Rev0;3/11SPI是Motorola,Inc.的商标。相关型号以及配合该器件使用的推荐产品，请参见：china.maxim-ic.com/MAX31855.related定购信息在数据资料的最后给出。特性S冷端补偿S14位、0.25℃分辨率S提供K、J、N、T和E型热电偶器件版本(如果使用S和R型热电偶，请联系工厂)(见表1)S简单的SPI兼容接口(只读)S检测热电偶对GND或VCC短路S检测热电偶开路VCCGNDT+T-SOSCKCSMICROCONTROLLERMISOSCKSS0.1µFMAX31855�����������������������������������������������������������������MaximIntegratedProducts1本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。有关价格、供货及订购信息，请联络Maxim亚洲销售中心：108008521249(北中国区)，108001521249(南中国区)，或访问Maxim的中文网站：china.maxim-ic.com。�����������������������������������������������������������������MaximIntegratedProducts2MAX31855冷端补偿热电偶至数字输出转换器SupplyVoltageRange(VCCtoGND)..................-0.3Vto+4.0VAllOtherPins............................................-0.3Vto(VCC+0.3V)ContinuousPowerDissipation(TA=+70NC)SO(derate5.9mW/NCabove+70NC).......................470.6mWESDProtection(AllPins,HumanBodyModel).............±2000kVOperatingTemperatureRange........................-40NCto+125NCJunctionTemperature.....................................................+150NCStorageTemperatureRange..........................-65NCto+150NCLeadTemperature(soldering,10s)................................+300NCSolderingTemperature(reflow).....................................+260NCSOJunction-to-AmbientThermalResistance(BJA)........170NC/WJunction-to-CaseThermalResistance(BJC)...............40NC/WABSOLUTEMAXIMUMRATINGSNote1:PackagethermalresistanceswereobtainedusingthemethoddescribedinJEDECspecificationJESD51-7,usingafour-layerboard.Fordetailedinformationonpackagethermalconsiderations,refertochina.maxim-ic.com/thermal-tutorial.Stressesbeyondthoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionalopera-tionofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.PACKAGETHERMALCHARACTERISTICS(Note1)RECOMMENDEDOPERATINGCONDITIONS(TA=-40NCto+125NC,unlessotherwisenoted.)DCELECTRICALCHARACTERISTICS(3.0VPVCCP3.6V,TA=-40NCto+125NC,unlessotherwisenoted.)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSPower-SupplyVoltageVCC(Note2)3.03.33.6VInputLogic0VIL-0.3+0.8VInputLogic1VIH2.1VCC+0.3VPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSPower-SupplyCurrentICC9001500FAThermocoupleInputBiasCurrentTA=-40NCto+125NC,100mVacrossthethermocoupleinputs-100+100nAPower-SupplyRejection-0.3NC/VPower-OnResetVoltageThresholdVPOR(Note3)22.5VPower-OnResetVoltageHysteresis0.2VOutputHighVoltageVOHIOUT=-1.6mAVCC-0.4VOutputLowVoltageVOLIOUT=1.6mA0.4V*本数据资料中如有与ElectricalCharacteristics表中参数(最小值、典型值、最大值)不一致的引用，请以ElectricalCharacteristics表中的数据为准。�����������������������������������������������������������������MaximIntegratedProducts3MAX31855冷端补偿热电偶至数字输出转换器THERMALCHARACTERISTICS(3.0VPVCCP3.6V,TA=-40NCto+125NC,unlessotherwisenoted.)(Note4)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMAX31855KThermocoupleTemperatureGainandOffsetError(41.276FV/NCnominalsensitivity)(Note4)TTHERMOCOUPLE=-200NCto+700NC,TA=-20NCto+85NC(Note3)-2+2NCTTHERMOCOUPLE=+700NCto+1350NC,TA=-20NCto+85NC(Note3)-4+4TTHERMOCOUPLE=-200NCto+1350NC,TA=-40NCto+125NC(Note3)-6+6MAX31855JThermocoupleTemperatureGainandOffsetError(57.953FV/NCnominalsensitivity)(Note4)TTHERMOCOUPLE=-40NCto+750NC,TA=-20NCto+85NC(Note3)-2+2NCTTHERMOCOUPLE=-40NCto+750NC,TA=-40NCto+125NC(Note3)-4+4MAX31855NThermocoupleTemperatureGainandOffsetError(36.256FV/NCnominalsensitivity)(Note4)TTHERMOCOUPLE=-200NCto+700NC,TA=-20NCto+85NC(Note3)-2+2NCTTHERMOCOUPLE=+700NCto+1300NC,TA=-20NCto+85NC(Note3)-4+4TTHERMOCOUPLE=-200NCto+1300NC,TA=-40NCto+125NC(Note3)-6+6MAX31855TThermocoupleTemperatureGainandOffsetError(52.18FV/NCnominalsensitivity)(Note4)TTHERMOCOUPLE=-250NCto+400NC,TA=-20NCto+85NC(Note3)-2+2NCTTHERMOCOUPLE=-250NCto+400NC,TA=-40NCto+125NC(Note3)-4+4MAX31855EThermocoupleTemperatureGainandOffsetError(76.373FV/NCnominalsensitivity)(Note4)TTHERMOCOUPLE=-40NCto+700NC,TA=-20NCto+85NC(Note3)-2+2NCTTHERMOCOUPLE=+700NCto+900NC,TA=-20NCto+85NC(Note3)-3+3TTHERMOCOUPLE=-40NCto+900NC,TA=-40NCto+125NC(Note3)-5+5ThermocoupleTemperatureDataResolution0.25NCInternalCold-JunctionTemperatureErrorTA=-20NCto+85NC(Note3)-2+2NCTA=-40NCto+125NC(Note3)-3+3Cold-JunctionTemperatureDataResolutionTA=-40NCto+125NC0.0625NCTemperatureConversionTime(Thermocouple,ColdJunction,FaultDetection)tCONV(Note5)70100msThermocoupleConversionPower-UpTimetCONV_PU(Note6)200ms*本数据资料中如有与ElectricalCharacteristics表中参数(最小值、典型值、最大值)不一致的引用，请以ElectricalCharacteristics表中的数据为准。�����������������������������������������������������������������MaximIntegratedProducts4MAX31855冷端补偿热电偶至数字输出转换器Note2:AllvoltagesarereferencedtoGND.CurrentsenteringtheICarespecifiedpositive,andcurrentsexitingtheICarenegative.Note