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我的单片机串口是3.3V的信号，现在用USB转串口调试，USB转串口输出的信号为5.0V，单片机最高工作温度为150℃，高温环境下，单片机串口不响应，请问下有什么办法解决吗？在串口线上加限流电阻可行不？或者加二极管降压的方式
在高温时温度到了多少度？
环境温度150℃，但电路板上没到，单片机PWM波输出正常的，冷却一会儿串口正常
