Interface control circuit and control method thereof

A control method for controlling an interface control circuit which includes an interface transceiver circuit coupled to an interface which includes at least one interface pin, the interface transceiver being configured to operably transmit and/or receive an interface signal through the interface;

• the control method comprising:
• generating a protection control signal according to a contact pin capacitance of a first interface pin, wherein the step of generating the protection control signal includes:
• within a predetermined detection time period starting from when a second interface pin determines that an attaching event occurs, sensing the contact pin capacitance of the first interface pin;
• and
• determining whether an electrolytic substance exists and is coupled to the first interface pin according to whether the contact pin capacitance is larger than a predetermined first capacitance threshold;
• and
• triggering the interface signal transceiver circuit to execute a protection operation when the protection control signal indicates that the electrolytic substance exists and is coupled to the first interface pin;
• wherein the interface includes the first interface pin and the second interface pin, wherein the first interface pin and the second interface pin are one same interface pin or separate different interface pins.