Electronic device and method for communicating with external device through power source line

An electronic device for supplying power to an external device, comprising:

• a housing including at least one groove for keeping the external device;
• a connector pin configured to supply power to the external device, the connector pin comprising:
• a first connector pin positioned in an area of the groove to supply a high potential voltage, and
• a second connector pin positioned in another area of the groove to supply a low potential voltage;
• a power supply configured to supply a given high potential voltage to the first connector pin;
• a current sensing circuit configured to detect a current of the first connector pin;
• and
• a controller operatively connected to the connector pin, the power supply, and the current sensing circuit,
• wherein the controller is configured to:
• supply a given high potential voltage to the first connector pin based on a detection of the external device being connected to the connector pin,
• detect the current of the first connector pin while the given high potential voltage is supplied,
• extract digital information based on a current change of a given range or more being detected in the first connector pin, and
• perform a given function based on the extracted digital information.