| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize electronic equipment capable of effectively improving battery power supply efficiency. <P>SOLUTION: A 3.3V voltage detector 5 detects whether the battery 2 voltage is more than a predetermined voltage. When the battery voltage is more than the predetermined voltage, a SW is connected to a terminal B. Thereby, the output voltage of the battery 2 is controlled to 3.3V by a regulator, to supply the 3.3V voltage to a logic circuit. On the other hand, when the battery 2 voltage is not more than the predetermined voltage, the SW is connected to a terminal A. Thereby, the output voltage of the battery 2 is stepped up to 5V by a step-up circuit 3 to supply the 3.3V voltage to a logic circuit 7 via the regulator 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
