用2556做usb开关,芯片规格书上写的此pin在1.1v即可关断或打开芯片,但是应用中,EN pin接3.3v上拉,上电时,因为芯片io默认配置,会被分压到2.7v左右,输出一直是5v。
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用2556做usb开关,芯片规格书上写的此pin在1.1v即可关断或打开芯片,但是应用中,EN pin接3.3v上拉,上电时,因为芯片io默认配置,会被分压到2.7v左右,输出一直是5v。