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[FAQ] PMBus 主器件是否需要时钟拉伸?

主题中讨论的其他器件:UCD90120AUCD9090UCD90160AUCD90160UCD90320UUCD90120UCD9090AUCD90124UCD90124A、 UCD90320

是的。UCD90xxx 器件可能会在处理 PMBus 查询时保持时钟低电平。根据 PMBus 规范,主机需要支持长达 35ms 的时钟拉伸。建议在两次 PMBus 查询之间保留 1ms 的间隔;否则,UCD90xxx 可能偶尔将时钟保持在低电平 35ms,然后超时(硬件释放时钟线)。