Linear LTC2983多传感器高精度数字温度测量系统方案

Linear公司的LTC2983能测量各种温度传感器并以数字输出,分辨率0.001℃,精度0.1℃,可以测量2/3/4线RTD,温度调节器和二极管.器件包括20个可配置的模拟输入端,激励电流源和对每种传感器的故障检测电路.工作电压2.85V-5.25V,主要用在热电偶,RTD和温度调节器的温度直接测量,以及专用传感器应用.本文介绍了LTC2983主要特性,框图,典型应用电路,以及包括LTC2983入门板,主板(DC2209),20输入分接板(DC2210)和LinduinoOne(DC2026)的温度测量系统DC2296A特性,电路图和材料清单.TheLTC?2983measuresawidevarietyoftemperaturesensorsanddigitallyoutputstheresult,in℃or°F,with0.1℃accuracyand0.001℃resolution.TheLTC2983canmeasurethetemperatureofvirtuallyallstandard(typeB,E,J,K,N,S,R,T)orcustomthermocouples,automaticallycompensateforcoldjunctiontemperaturesandlinearizetheresults.Thedevicecanalsomeasuretemperaturewithstandard2-,3-,or4-wireRTDs,thermistors,anddiodes.Ithas20reconfigurableanaloginputsenablingmanysensorconnectionsandconfigurationoptions.TheLTC2983includesexcitationcurrentsourcesandfaultdetectioncircuitryappropriateforeachtypeoftemperaturesensor.TheLTC2983allowsdirectinterfacingtogroundreferencedsensorswithouttheneedforlevelshifters,negativesupplyvoltages,orexternalamplifiers.Allsignalsarebufferedandsimultaneouslydigitizedwiththreehighaccuracy,24-bitΔΣADC’s,drivenbyaninternal10ppm/℃(maximum)reference.LTC2983主要特性:DirectlyDigitizeRTDs,Thermocouples,Thermistors,=andDiodesSingle2.85Vto5.25VSupplyResultsReportedin℃or°F20FlexibleInputsAllowInterchangingSensorsAutomaticThermocoupleColdJunctionCompensationBuilt-InStandardandUser-ProgrammableCoefficientsforThermocouples,RTDsandThermistorsConfigurable2-,3-,or4-WireRTDConfigurationsMeasuresNegativeThermocoupleVoltagesAutomaticBurnOut,Short-CircuitandFaultDetectionBufferedInputsAllowExternalProtectionSimultaneous50Hz/60HzRejectionIncludes10ppm/℃(max)Reference(I-Grade)LTC2983应用:DirectThermocoupleMeasurementsDirectRTDMeasurementsDirectThermistorMeasurementsCustomSensorApplications图1.LTC2983框图图2.LTC2983带自动冷端补偿的热电偶测量电路图图3.LTC2983典型RTD/电热调节器应用电路图图4.LTC2983通用输入共享热电偶,二极管,电热调节器,三线RTD和4线RTD应用电路图温度测量系统DC2296A包括LTC2983入门板,主板(DC2209),20输入分接板(DC2210)和LinduinoOne(DC2026)TheDC2296isthestarterkitfordemonstratingtheperformanceandeaseofuseoftheLTC®2983,whichisacompletetemperaturemeasurementsystemonachip.ThiskitincludestheDC2209(maindemocircuitcontainingtheLTC2983)andtheDC2210(asimpleexperimentcircuitallowingbreadboarding).Inadditiontothestarterdemonstrationkit,sensorspecificdemonstrationboardshighlightingtheperformanceofRTDs,thermistors,orthermocouplesarealsoavailable.傲壹电子(AO-Electronics)官网：中文网：•UniversalTemperatureMeasurementBoard–DC2211•ThermocoupleBoard–DC2212•DedicatedRTDBoard–DC2213•DedicatedThermistorBoard–DC2214TheDC2209isamemberoftheQuikEval™familyofdemonstrationboards.ItisdesignedtoalloweasyevaluationoftheLTC2983andmaybeconnectedtoanyoneofthesensordaughterboards.ThesedaughterboardsallowevaluationofthevariousLTC2983sensortypes(seeFigure1).Fortheserialdigitalinterface,theDC2209maybeconnectedtotheDC2026Linduino™One.图5.温度测量系统DC2296A外形图TheDC2296isthestarterkitfordemonstratingtheperformanceandeaseofuseoftheLTC®2983,whichisacompletetemperaturemeasurementsystemonachip.ThiskitincludestheDC2209(maindemocircuitcontainingtheLTC2983)andtheDC2210(asimpleexperimentcircuitallowingbreadboarding).Inadditiontothestarterdemonstrationkit,sensorspecificdemonstrationboardshighlightingtheperformanceofRTDs,thermistors,orthermocouplesarealsoavailable.图6.DC2209温度测量板外形图图7.DC2210实验板外形图图8.DC2210实验板电路图图9.DC2211通用温度测量板外形图图10.DC2211通用温度测量板电路图图11.DC2212热电偶子板外形图图12.DC2212热电偶子板电路图图13.DC2213专用RTD板外形图图14.DC2213专用RTD板电路图图15.DC2213热电偶子板外形图图16.DC2214专用电热调节器板电路图图17.温度测量系统DC2296A电路图温度测量系统DC2296A材料清单:LinearTechnology’sDC2026(calledtheLinduino™One)iscompatiblewiththeArduinoUnomicrocontrollerboard.ArduinohardwareconsistsofanAtmelmicrocontrollerwithabootloaderallowingquickin-circuitfirmwareupdates.ThesoftwareisasimpleprogrammingenvironmentbasedontheAVRGCCcompiler.Thisplatformispopularbecauseitiseasytouse,boththehardwareandsoftwareareopensource,anditcanbeprogrammedinC.WefinditanidealwaytodemonstrateanddistributelibrariesforintegratedcircuitsthathavedigitalinterfacessuchasInter-IntegratedCircuit(I2C)andSerialPeripheralInterface(SPI).WhiletheLinduinoOneisArduino-compatible,itisnotproducedbytheofficialArduinoteam,andtheydonotreceiveanymonetarysupportfromthisboard.图18.Linduino™One板连接图图19.Linduino™One板框图图20.Linduino™One板电路图(1)图21.Linduino™One板电路图(2)Linduino™One板材料清单: