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为了更好理解您的问题,需要您提供更多的信息。
这是您自制的板子还是TI EVM?
热焊盘是否焊接到板上?
即使没有时钟信号,该器件也可以保持一定的电流。负载是多少? 如果是步进电机,是否可以测量每个线圈中的电流?