| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow a USB apparatus connected to a USB connector to be charged through USB during power off period without operating a system for detecting connection of the USB apparatus in an electronic apparatus having the USB connector. <P>SOLUTION: An electronic apparatus 100 includes a USB (Universal Serial Bus) 60, and can be switched between an off state where only a sub CPU 50 for monitoring a start instruction of a user is energized while being connected with an external power source, and an on state where components other than the CPU 50 are also energized while being connected with the external power source. The sub CPU 50 is supplied with a driving voltage generated on the basis of the external power source during the off state, and a power input terminal 31 of a DC/DC converter 30 that supplies power to a power source terminal of the USB connector 60 is directly connected to a supply line LB of the driving voltage for the sub CPU 50. <P>COPYRIGHT: (C)2013,JPO&INPIT |
