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我的电路如下：我想通过SLEEP_PEN3来控制输出5V,SLEEP_PEN3是处理器输出的3.3v电压，但是不知道为什么有的时候上电启动输出以后是3.3v，有的时候是5v，请求指导
什么意思？EN控制，能否给出参考电路？
