Peripheral device and control method thereof

A peripheral device capable of being connected to a host device through a connection cable including a power line, comprising:

• a first power terminal capable of being connected to said power line of said connection cable;
• a power circuit connected to a second power terminal different from said first power terminal and for supplying power to an internal circuit;
• and
• a control unit for causing said power circuit to start supplying power to said internal circuit when power has been supplied to said first power terminal through said connection cable, and for stopping said power circuit from supplying power to said internal circuit when said first power terminal is no longer being supplied with power.

A control method for controlling power on/off of a peripheral device capable of being connected to a host device through a connection cable including a power line, comprising:

• a step of supplying power to a first power terminal of said peripheral device through said connection cable;
• a step of generating a start signal causing a power circuit of said peripheral device to start supplying power to an internal circuit of said peripheral device, when power has been supplied to said first power terminal, said power circuit being connected to a second power terminal different from said first power terminal;
• a step of allowing said power circuit of said peripheral device to start supplying power to said internal circuit of said peripheral device by means of said start signal;
• and
• a step of allowing said start signal to remain activated when power has been supplied to said internal circuit from said power circuit.