USB device

A USB device for performing communications with a host device through a USB interface, while receiving electric power from the host device through the USB interface, the USB device comprising:

• a communication unit that communicates with the host device through the USB interface;
• a low load unit operable by electric power of the standard power voltage prescribed in the standards of the USB interface;
• and
• a high load unit consuming electric power larger than the electric power consumed in the low load unit;
• wherein
• the high load unit is supplied the electric power having a power voltage higher than the standard power voltage from the host device.

An apparatus for performing internal communications, comprising:

• a first device;
• a USB interface having a power-source supplying line, the USB interface connected to the first device;
• and
• a second device connected to the first device through the USB interface;
• wherein
• the first device comprises a communication unit that communicates with the second device through the USB interface, and a power source capable of outputting electric power of a voltage being different from a standard power voltage prescribed in the standards of the USB interface;
• and
• the power source supplies the electric power to the second device through the power-source supplying line.