| 摘要 |
PROBLEM TO BE SOLVED: To accurately monitor the deviation of many various voltages to be monitored from an upper limit and a lower limit with simple circuitry and with a small space. SOLUTION: This voltage monitoring device comprises a first comparator circuit for detecting a state where a comparative voltage proportional to the voltage to be monitored is higher than a first threshold voltage and outputting a logic-1 level, a second comparator circuit for detecting a state where the comparative voltage is higher than a second threshold voltage higher than the first threshold voltage and outputting the logic-1 level, an inverter circuit for inverting the output of the second comparator circuit, and an AND-circuit for obtaining AND of the outputs of the first comparator circuit and the inverter circuit. The voltage monitoring device detects whether the comparative voltage deviates from the range surrounded by the first and second threshold voltages based on the output of the AND-circuit. COPYRIGHT: (C)2008,JPO&INPIT
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