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当电源适配器断电，系统由电池供电的情况下，VREF引脚是不是始终都是3.3V输出？还是只要电源适配器断电了，VREF引脚就不会输出3.3V电压。请TI的FAE帮忙解答一下，我需要确认这个问题, 拜托了。
感谢回答
