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TUSB211为什么输入输出短接

Other Parts Discussed in Thread: TUSB211

TUSB211为什么输入输出短接,正常理解信号是往阻抗小的地方通过,如果输入输出短接了,就相当于没有用到TUSB211,那芯片怎么起到信号增强作用????