Electronic device, and method of controlling electronic device
AssigneeCanon Kabushiki Kaisha
InventorsYasusaburo Degura, Hidenori Shiba, Masakazu Nakadokoro
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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.
Claims26
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 GND terminal connected to the second terminal;
- a control unit configured to cause a resistance between the second terminal and the GND terminal to change;
- and
- a determination unit configured to determine a type of the external device based on a voltage of the first terminal after the control unit causes the resistance to change.
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;
- and
- 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.
A control apparatus, comprising:
- a first control unit configured to control a power reception process for receiving power from a connected external device via a first terminal;
- a second control unit configured to control a resistance between a GND terminal and a second terminal that is for obtaining information of the external device;
- and
- a determination unit configured to determine a type of the external device based on a voltage value of the first terminal after a predetermined period elapses since the second control unit caused the resistance between the second terminal and the GND terminal to change,
- wherein the first control unit controls the power reception process in accordance with 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, a second terminal for obtaining information of the external device, and a GND terminal connected to the second terminal, the method comprising:
- causing a resistance between the second terminal and the GND terminal to change;
- and
- determining a type of the external device based on a voltage of the first terminal after causing the resistance to change.
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 a voltage of the second terminal from a voltage included in a predetermined range to a voltage outside of the predetermined range;
- and
- determining 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.
A method of controlling a control apparatus for controlling a power reception process for receiving power from a connected external device via a first terminal, the method comprising:
- changing a resistance between a GND terminal and a second terminal that is for obtaining information of the external device;
- determining a type of the external device based on a voltage value of the first terminal after a predetermined period has elapsed since changing the resistance between the second terminal and the GND terminal;
- and
- controlling the power reception process in accordance with the determined type of the external device.
Dependencies are inferred from the claim text.