| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage signal detector capable of shortening an execution time required for AD conversion, miniaturizing the whole, and monitoring for a long period an influence of an instantaneous noise having a small frequency of exerting an influence on output from a constant voltage power source. SOLUTION: This voltage signal detector is equipped with a voltage measuring device for outputting a measurement signal 3 of a supply voltage; a plurality of comparators O1-O8 equipped respectively with a terminal for a voltage to be measured for applying a voltage to be measured which is not sample-held from the voltage measuring device and a reference voltage terminal for applying a reference voltage from a reference voltage generator 2, for comparing each voltage input respectively into the terminal for the voltage to be measured and the reference voltage terminal, and converting into a digital signal from the difference between both voltages, and for connecting each terminal in parallel; a voltage dividing circuit comprising a plurality of voltage dividing resistances R1-R8 connected between adjacent reference voltage terminals of each comparator O and between each power supply line of a comparator and the reference voltage generator on the terminal side, for dividing a reference voltage from the reference voltage generator; and a latch circuit 13 for latching output from each comparator O. COPYRIGHT: (C)2009,JPO&INPIT
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