| 摘要 |
PROBLEM TO BE SOLVED: To indicate remaining battery capacity suitable for the usage pattern of a portable apparatus which is driven by the power supply from a built-in battery. SOLUTION: A resistor 11 connected between a power supply switch 4 and a non-reverse input terminal (b) of a comparator 1. A resistor 12 is connected between the non-reverse input terminal (b) of the comparator 1 and the collector terminal of a transistor 13. Further, the emitter terminal of the transistor 13 is connected to a GND and the base terminal of the transistor 13 is connected to the collector terminal of a transistor 14. Further, the emitter terminal of the transistor 14 is connected to a power supply, and the base terminal of the transistor 14 is connected to the output terminal (c) of the comparator 1. With this constitution, after an 'L' level has been once outputted to the output terminal (c) of the comparator 1, a battery voltage is divided by the resistor 11, and the resistor 12 and a voltage lower than the battery voltage is applied to the non-reverse input terminal (b) of the comparator 1. |
