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BQ25792: 只使用BAT供电,SYS输出每隔固定时间就会关断

Part Number: BQ25792

只使用BAT供电,VBUS没有输入,SYS输出每隔固定时间就会关断,比较规律,关断后立即自动开启。这种现象是因为啥,需要配置什么寄存器吗