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ADS1247疑问

Other Parts Discussed in Thread: ADS1247

最新在使用ADS1247测量PT100,MCU51模拟SPI访问ADS1247,可以读写所有的寄存器。但是无法测量温度,DOUT交永远是低电平,而且差分电压也总是0.000V。想请问,应当如何给ADS1247发送指令,才能让它开始转换温度。