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请问红色框起来的三极管电路的作用是什么？
您好，这个电路是哪里的？
我看了下EVM板子上的原理图，TX端没有像这里加三极管，从这个图来看，TX端电压控制三极管的导通闭合，当三极管导通时，DN1 connector的Pin4接GND，否则Pin4是和芯片的Pin 5 CQ连接：
