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求教:BQ20Z45四串保护电路短路后不能恢复

Other Parts Discussed in Thread: BQ20Z45

BQ20Z45为核心的4串电池保护电路,我将P+和P-短接后,上位机显示通信错误,不能连接上位机。然后更换了MOS和采样电阻,可以连接上位机,分析是采样电阻坏了。但连接上位机后,MOS管不再打开,重新拆下电芯再接上还是这样。各状态字如图:请问怎么才能恢复呢?