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UCD90120A上电启动不了,为什么?

Other Parts Discussed in Thread: UCD90120A

现在用UCD90120A,配置烧录进去了,拔掉USB-TO-GPIO,上电,管理的4个电源启动不了;然后插上USB-TO-GPIO,打开上位机软件,管理的电源启动了?这是什么问题?