Circuit for generating a reference voltage and detecting an undervoltage of a supply voltage and corresponding method

摘要

A circuit for generating a reference voltage and detecting a drop in a supply voltage, comprising at least one threshold comparator (12) having an input terminal (IN) and an output terminal, and a voltage divider (14) connected between a first supply voltage reference (Vs) and a second voltage reference (GND) and connected to the input terminal (IN) of the comparator (12), further provides for the output terminal (OUT) of said comparator (12) to be connected to the input terminal (IN) through at least one feedback network comprising at least one current generator (CG1). The feedback network further comprises a buffer block (13) having an input terminal connected to said comparator (12) and a first output terminal (DO) connected to a switch (SW) which is connected between a circuit node (X2) of said voltage divider (14) and the second voltage reference (GND). <IMAGE>