Electronic device being connectable to external device, and method of controlling electronic device being connectable to extenal device
AssigneeCanon Kabushiki Kaisha
InventorsYasusaburo Degura, Hidenori Shiba, Masakazu Nakadokoro
Life of this patent
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Abstract
An electronic device has a first terminal for receiving power from a connected external device, a second terminal for obtaining information of the external device, and a GND terminal connected to the second terminal. The electronic device causes a resistance between the second terminal and the GND terminal to change, and determines a type of the external device based on a voltage of the first terminal after the resistance is caused to change.
Claims49
An electronic device, comprising:
- a first terminal for receiving power from a connected external device;
- a second terminal for obtaining information of the external device;
- a control unit configured to control a voltage of the second terminal;
- a determination unit configured to determine a type of the external device in accordance with a voltage of the first terminal after a predetermined period has elapsed since the control unit changed the voltage of the second terminal from a voltage included in a predetermined range to a voltage not in the predetermined range;
- and
- a power supply unit configured to perform a process related to a power supply via the first terminal from the external device, based on the type of the external device determined by the determination unit.
A method of controlling an electronic device provided with a first terminal for receiving power from a connected external device, and a second terminal for obtaining information of the external device, the method comprising:
- changing, by at least one of a circuitry and a processor, a voltage of the second terminal from a voltage included in a predetermined range to a voltage outside of the predetermined range;
- determining, by at least one of the circuitry and the processor, a type of the external device in accordance with a voltage of the first terminal after a predetermined period has elapsed since the voltage of the second terminal was changed to the voltage outside of the predetermined range;
- and
- performing, by at least one of the circuitry and the processor, a process related to a power supply via the first terminal from the external device, based on the type of the external device determined by the determining.
An electronic device, comprising:
- a first terminal configured to receive power from a connected external device;
- a second terminal configured to obtain information of the external device, and
- at least one of a circuitry and a processor that (1) controls a voltage of the second terminal, (2) determines a type of the external device in accordance with a voltage of the first terminal after a predetermined period has elapsed since the voltage of the second terminal was changed from a voltage included in a predetermined range to a voltage not in the predetermined range, and (3) performs a process related to a power supply via the first terminal from the external device, based on the type of the external device determined.
An electronic device, comprising:
- a first terminal configured to receive power from a connected external device;
- a second terminal configured to obtain information of the external device, and
- at least one of a circuitry and a processor that (1) changes a voltage of the second terminal from a voltage included in a predetermined range to a voltage not in the predetermined range, and (2) performs a process related to a power supply via the first terminal from the external device, based on a voltage of the first terminal after a predetermined period has elapsed since the voltage of the second terminal was changed from the voltage included in the predetermined range to the voltage not in the predetermined range.
Dependencies are inferred from the claim text.