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通过OVERCURxz检测，这个引脚定义： This pin is used to connect the overcurrent output of the downstream port power switch for port . 可以看下demo板的电路图，这个引脚是和USB power switch TSC2001C连接的，输出可以限制500mA，1A等几个值。 一旦有过流产生，下行端口的power会自动关闭。
