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SN888C从机 先后上电,出现极性校正错误

Other Parts Discussed in Thread: SN888C

1:主机通过任一个从机供电。

2:其中一个从机先上电,其他从机后上电的情况下,出现极性判断错误。

请问该如何规避,上电先后引起的极性判断错误呢?

  • 您好,SN888C 是带有自动极性校准功能的,datasheet中给出了自动校准的三个条件:

    • A failsafe-biasing network (commonly at the master node) must define the signal polarity of the bus.
    • A slave node must enable the receiver and disable the driver (/RE = DE = low).
    • The bus must idle for the failsafe time, tFS-max.

    所以目前您的应用中, 是三个从机中任意一个先上电,都会出现极性错误是吗?
    没有自动实现校正,上述三个条件是否都满足? 比如主机这边是否有偏置电路的极性和slave这边极性不一致? 是否将driver disable,/RE=DE=Low? 拓扑结构中 ,cable 是否有cross 现象导致极性相反?