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TSS721A芯片RX在接收信号时,为什么TX也有信号在变化,而不是保持高电平不变?

Other Parts Discussed in Thread: TSS721A

如图,当RX接收信号时,TX也有信号在输出,不知道为什么?

而从BULS1和BULS2之间输出的数据是正确的,可以读出来。