Electronic device for providing handwriting input function and method of operating the same

A method in an electronic device, the method comprising:

• receiving power from a first external device via an antenna included in a housing of the electronic device, wherein the housing includes a first cover portion adapted to couple to a first face of the first external device, a second cover portion adapted to couple to a second face of the first external device including the antenna, and a third cover portion adapted to surround at least a portion of a side face of the first external device, wherein the third cover portion connects the first cover portion and the second cover portion;
• driving, by a processor, an input-sensing circuit of the electronic device based on at least a part of the received power;
• detecting, by the input-sensing circuit, an input of a second external device;
• and
• transmitting, by a wireless communication circuit of the electronic device, a signal related to the second external device to the first external device.

An electronic device, comprising:

• a housing including a first face, a second face, and a third face surrounding a side face of a first external device;
• an antenna disposed adjacent to the second face of the housing;
• a power management circuit configured to control power supplied to another electronic device via the antenna;
• a wireless communication circuit configured to communicate with the another electronic device using the antenna;
• and
• a control circuit disposed in the housing and operatively connected to the power management circuit and the wireless communication circuit,
• wherein the control circuit is configured to:
• determine whether or not data is received via the wireless communication circuit indicating detecting of the other electronic device, and
• determine whether power is to be supplied to the other device using the power management circuit based on the determination.