| 摘要 |
PROBLEM TO BE SOLVED: To obtain a battery residual quantity warning circuit for outputting a battery residual quantity warning after a battery is fully used, reducing current consumption and outputting the warning for various batteries at proper time. SOLUTION: A system controller 16 calculates DC resistance of the battery 4 based on a difference between current values in operation modes before and after changing stored in a memory 14 and a voltage fluctuation of the battery 4 measured by an A/D converter 12, and transmits a warning indication signal to a data LCD 28 when the calculated DC resistance exceeds a predetermined level. COPYRIGHT: (C)2004,JPO
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