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是什么原因导致BQ20Z95芯片不能关闭放电MOS管,使PF DFETF旗标变红?

如标题,电池在正常使用时一切都正常,在50度环境下放电后,电池DFETF旗标变红,将PF解锁后一切又都正常了。

这个是什么原因导致BQ20Z95芯片不能关闭放电MOS管,使PF DFETF旗标变红?