| 摘要 |
PROBLEM TO BE SOLVED: To provide communication equipment for reducing costs while suppressing a standby power. SOLUTION: This communication equipment 30 is provided with a bus 21 having a signal line 21a supplied with a pull-up voltage Vp for transmitting a prescribed signal; a first power source 31 operating during both a standby state and power-ON state as the source of supply of a first prescribed voltage of 3.3V; a second power source 32 operating during only the power-ON state as the source of supply of a second prescribed voltage of 5V; a first device 33 driven by the first power source 31 for communicating through the bus 21 when the pull-up voltage Vp is equal to either of 3.3V and 5.5V; and a second device 34 driven by the second power source 32 for communicating through the bus 21 when the pull-up voltage Vp is equal to 5V. This communication equipment 30 is provided with a pull-up voltage supply circuit 50 for supplying the pull-up voltage Vp by the first power source 31 during the standby state, and for supplying the pull-up voltage Vp by the second power source 32 during the power-ON state. COPYRIGHT: (C)2009,JPO&INPIT
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