100-C09D10

100-C09D10

100-C09D10

100-C09D10

100-C09D10

硬件电路由微处理器、CAN控制器、测温芯片MAX6675、LED、键盘、复位电路、蜂鸣器等几部分组成,如图1所示。单片机AT89C51是硬件电路的核心,承担CAN控制器的初始化、数据收发控制等任务;CAN总线控制器用于同上位机进行远程通讯,能够独立完成CAN总线上数据的接收和发送工作;MAX6675芯片用于检测和发送温度数据。

 测温电路图

MAX6675从I/O口线输出数据的具体过程如下:P12端口输出的低电平将CS变低,并提供时钟信号给SCK,由SO口读取测量结果。CS变低,将停止任何转换过程,CS变高将启动一个新的转换过程。

一个完整串行接口读操作需16个时钟周期,在时钟的下降沿读16个输出位。第15位是伪标志位,并总为0;第14位到第3位为以MSB到LSB顺序排列的转换温度值;第2位平时为低,当热电偶输入开放时为高,开放热电偶检测电路完全由MAX6675实现,为开放热电偶检测器操作,T-必须接地,并使能地点尽可能接近GND  脚;第1位为低以提供MAX6675器件身份码,第0位为三态标志位 。

EMERSON 02-033639-10

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