| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply voltage detection circuit avoiding malfunction during low power supply voltage, regarding the power supply voltage detection circuit detecting a low voltage state, performing a notification to a system or stopping the system. <P>SOLUTION: A pull-up circuit 250 is provided for an output of a circuit 200 for generating reference voltage Vref, and the circuit 200 for generating the reference voltage Vref is pulled up to power supply voltage VE(100). A switch S1(347) is provided in series with a detection resistance comprising R1(341) and R2(342), and the switch S1(347) is turned on/off by the circuit 200 for generating the reference voltage Vref. In the configuration, the reference voltage Vref(225) is pulled up to the power supply voltage VE(100) by the pull-up circuit 250 during low power supply voltage, the switch S1(347) is turned off and a partial voltage value VI(345) is forcibly lowered to hold a state of Vref>VI and avoid an output of an erroneous signal from a comparator 330. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
