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如果我外部供电是5V2A的适配器，然后电池也没有电，我想在上电瞬间就开机。
如果开机最大瞬间的电流是2A，我适配器输出的2A电流会完整的输出到VSYS吗？
那在这个时候我是否可以限制充电电流？包括停止充电这些功能
