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US 2002/0162035 A1Published application
Interface circuit and disk drive apparatus
AssigneeSanyo Electric Co., Ltd.
InventorAkira Tsukihashi
Life of this patent
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Abstract
A CPU (28) determines, based on a signal from a power source determination circuit (30), whether or not power is supplied from an external power source. When power is supplied from an external power source, the CPU (28) controls the USB interface (16) to operate as a ver. 2.0 interface. When power is not supplied from an external power source, the CPU (28) controls the USB interface (16) to operate as a ver. 1.1 an interface, thereby reducing power consumption.
Claims6
An interface circuit for USB data transfer, comprising:
- a power source determination circuit for determining a type of power source;
- a power feeding switching circuit for setting an amount of current to be supplied to a processing circuit conducting processing for data transfer, based on a result of determination made by the power source determination means;
- and
- a clock switching circuit for setting operation clocks for the processing circuit according to a result of determination made by the power source determination means,
- wherein
- a data transfer rate is set according to the type of power source.
3 more elements
Dependencies are inferred from the claim text.