| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem wherein, although whether or not an input voltage range is within a range from an upper limit reference voltage to a lower limit reference voltage can be detected, which voltage level it is on within the range cannot be detected. <P>SOLUTION: A voltage detection circuit includes: a comparator 3 for comparing an input voltage with a non-square wave signal periodically varying between an upper limit value and a lower limit value, and outputting a binary voltage detection signal indicating whether the former is higher than the latter or the latter is higher than the former; and a detection section 5 for measuring a width of a pulse included in the voltage detection signal to detect a voltage level of the input voltage. <P>COPYRIGHT: (C)2013,JPO&INPIT |
