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DS90uh925Q如何检测到对端的连接?



我用DS90uh925q和ds90uh928q配对使用,现在我接上的时候在925侧的寄存器检测不到这个连接状态。也就是说那个0x0c寄存器还是0,而不是1

请问我这是哪儿有问题呢?我量过VOUT-,VOUT+,DE,HS,VS,SDL,SCL, PCLCK都是正常的