Universal serial bus interface circuit, electronic device including the same, and operating method thereof

An operating method of an electronic device including a universal serial bus (USB) Type-C connector, the operating method comprising:

• generating a first enable signal having a first enable level based on a state in which an external USB Type-C connector of an external electronic device and the USB Type-C connector are disconnected from each other;
• generating a pre-dual role port (DRP) signal based on a first internal clock signal that toggles independent of an operating state of the electronic device in response to the first enable level of the first enable signal;
• generating a wake-up signal indicating a connection between the external USB Type-C connector and the USB Type-C connector based on a configuration channel (CC) signal generated at a CC pin of the USB Type-C connector, the first enable signal, and the pre-DRP signal;
• generating a second enable signal having a second enable level in response to the wake-up signal;
• and
• activating an overvoltage protection operation for restricting overvoltage at the CC pin in response to the second enable level of the second enable signal.

A universal serial bus (USB) interface circuit connected to a bus voltage pin, a first configuration channel (CC) pin, and a second CC pin of a USB Type-C connector, the USB interface circuit comprising:

• a wake-up circuit configured to generate a pre-dual role port (DRP) signal based on a first internal clock signal that toggles independent of a connection state between the USB Type-C connector and an external USB Type-C connector in response to a first enable signal and to generate a wake-up signal based on a CC signal generated at one or more CC pins of the first CC pin and the second CC pin, the first enable signal, the pre-DRP signal, and the first internal clock signal;
• an overvoltage protection circuit configured to be activated in response to a second enable signal and to perform an overvoltage protection operation for restricting overvoltage at the one or more CC pins;
• a CC circuit configured to be activated in response to the second enable signal and to identify a situation related to a connection of the USB Type-C connector based on the CC signal;
• and
• a USB circuit configured to generate the first enable signal based on a state in which the USB Type-C connector and the external USB Type-C connector are disconnected from each other, to generate a second enable signal in response to the wake-up signal, and to charge a battery based on a situation related to a connection of the USB Type-C connector.