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（1）若是某个通道不用，是将该通道拉低吗？（2）下图中3，4默认应怎么连？因为不知道差分信号的电压 (3)该芯片的外围电路需要加防护措施吗？能提供参考电路吗？
悬空不用, LS 输入内部有上拉作用, 接地反而不合适
