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BQ40Z50: 客户测试高温保护时到恢复温度不能充电

Part Number: BQ40Z50
Other Parts Discussed in Thread: BQSTUDIO

客户在测试温度高温保护55度,温度恢复40度,测试方式 在55度温箱放置2小时后,测试充电不能充电,待温度恢复到40以下时 测试充电,还是不能充电,用上位机查看状态充放电MOS是打开的,但是用CHG_FET_TOGGLE测试充电MOS开关 不受控,拆下电池,重新组装上电后,MOS又可以控制了,请问是什么原因导致,谢谢