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1、基于CAN总线的温度检测系统摘要本设计以AT89S51单片机为核心的温度控制系统的工作原理和设计方法来研究CAN总线测控系统间数据通信、结构灵活、通用性号。我们还采用了单总线型数字式的温度传感器DS18B20，使系统具有测温误差小、分辨率高、抗干扰能力强，动态显示的方式等特点。选用SJA1000作为CAN总线的控制器与82C250芯片设计了CAN总线接口模块。82C250可以提供对总线的差动发送和接收功能，提高系统总线的节点驱动能力，增大通信距离，降低干扰。传感器电路将感应到的温度信号以电压的形式输出到信号调理电路，信号
2、经过调理后输入到A/D采样电路，由ADC将数字量值送给单片机系统，最后单片机将采集到的数据送到CAN总线控制器，通过CAN总线收发器传上总线，完成数据采集从而实现温度控制的目的。温度检测无论在医疗电子领域还是工业控制领域应用都非常广泛，人们都需要对各类加热炉、热处理炉、反应炉和锅炉中的温度进行检测和控制，医疗电子领域的生化分析仪等，内部都涉及到温度控制，具有特别广阔的前景。关键字：AT89S51单片机温度传感器DS18B20SJA1000控制器温度检测BasedonCANmainline'stemperatureexam
3、inationsystemPickingWanting窗体底端窗体顶端ThisdesignstudiesbetweentheCANmainlineobservationsystemtakeat89S51monolithicintegratedcircuitasthecoretemperaturecontrolsystem'sprincipleofworkandthedesignmethodthedatacommunication,thestructurenimble,theversatilenumbers.Wehavea
4、lsousedsinglemainlinetypenumbercharacterstyletemperaturesensorDS18B20,enablesthesystemtohavethetemperaturemeasurementerrortobesmall,theresolutionishigh,antjammingability,dynamicdemonstrationcharacteristicsandsoonway.SelectedSJA1000hasdesignedtheCANbusinterfacemod
5、uleastheCANmainline'scontrollerandthe82C250chip.82C250mayprovidetomainline'sdifferentialmotiontransmissionandthereceivefunction,sharpenssystembus'snodedrivingforce,increasesthesignaldistance,reducesthedisturbanceThesensorelectriccircuitwillinducethetemperaturesig
6、naloutputsthesignalrecuperationelectriccircuitbythevoltageform,thesignalaftertherecuperationinputstoa/Dsamplingcircuit,givesbyADCthedigitalsizethemonolithicintegratedcircuitsystem,finallythemonolithicintegratedcircuitwillgatherthedatadeliverstheCANbuscontrolunit,
7、passesonthemainlinethroughtheCANmainlinetransceiver,completesthedataacquisition,thusrealizesthetemperaturecontrolgoal.窗体顶端Regardlessofthetemperatureexaminationiswidespreadinthemedicalelectrondomainortheindustrialcontroldomainapplication,thepeopleneedtoeachkindofh
8、eatingfurnace,theheat-treatmentfurnace,thereactorandboiler'stemperaturecarryontheexaminationandthecontrol,themedicalelectrondomainbiochemistryanalyzerandsoon,t
