VOLTAGE DETECTION CIRCUIT AND IC CHIP

摘要

PROBLEM TO BE SOLVED: To provide a voltage detection circuit that detects whether an input voltage is higher than a detection reference without error.SOLUTION: A voltage detection circuit 100 comprises: a first voltage generation circuit 10 that holds down an input voltage Vwhen the input voltage Vis higher than a first threshold voltage and outputs a uniform reference voltage V; a second voltage generation circuit 20 that steps down the input voltage Vwhen the input voltage Vis higher than a second threshold voltage and outputs a voltage to be detected Vincreasing in accordance with the input voltage V; and a determination circuit 30 that determines whether the input voltage Vis higher than a reference voltage in accordance with the reference voltage Vand the voltage to be detected V. The reference voltage Vand the voltage to be detected Vgenerated only from the input voltage Vare used, thereby making it possible to detect whether the input voltage Vis higher than the reference voltage without error.SELECTED DRAWING: Figure 2