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BQ76930关机异常问题

如题,现象为在正常给SHUT_A、SHUT_B写关机命令时,偶尔会出现REGOUT输出电压降至1.3V左右后又拉起,动作在20ms左右,此时TS1无激活信号,并且在REGOUT下降时MCU已掉电,IIC通讯已停止,当REGOUT拉起后,MCU重新得电初始化,请教一下TI的工程师,出现该现象的原因,谢谢!