Computer peripheral used by being connected to a host computer to reduce power consumption in standby mode

摘要

A computer peripheral that can be connected to a host computer receives a power supply from the host computer. The computer peripheral includes: a USB connector 1 for connecting the computer peripheral to the host computer; a first circuit (FDD control IC 2 ) which directly receives the power supply from the host computer via the USB connector 1; and a second circuit (spindle motor driver 6 ) which receives the power supply from the computer via the first circuit. The first circuit includes a pull-up circuit 3 for maintaining a higher voltage level than that of the second circuit and a switch 32 for turning ON/OFF the pull-up circuit 3. The first circuit stops supplying the power supply from the first circuit to the second circuit via the switch 32 in the case where the first circuit receives a suspend signal from the host computer to become a standby mode.