Programmable power-on reset system

Abstract

The invention discloses a programmable power-on reset system which comprises a low-dropout regulator, an RC oscillator, a partial voltage stabilizer, an A / D converter and a counter control and judgment logic module, wherein the low-dropout regulator is used for converting a battery voltage into a supply voltage which is required by a controlled circuit, and outputting the supply voltage to the partial voltage stabilizer as a voltage to be detected; the RC oscillator is used for producing a clock signal; the partial voltage stabilizer is used for outputting partial voltage, voltage stabilization and filtration of the voltage to be detected to the A / D converter; the A / D converter is used for converting a voltage signal to be detected into a digital signal, and outputting the digital signal to the counter control and judgment logic module; the counter control and judgment logic module is used for comparing the output of the A / D converter with a programmable digital code, timing the time when the voltage to be detected is higher than a programmable power on threshold, and outputting a correct control signal according the results of timing and comparing.

Description

technical field [0001] The invention relates to the field of CMOS digital-analog hybrid integrated circuits, in particular to a programmable power-on reset technology in a digital circuit system. Background technique [0002] The Power on Reset (POR) system is widely used in various digital circuits and systems. Its main function is to ensure the correct startup of the entire circuit during power-on. The basic idea is to monitor the power supply voltage. The comparison threshold is set, and for the power supply voltage lower than the comparison threshold, the power-on reset system resets the storage elements such as flip-flops and latches of the entire functional circuit; when the power supply voltage is higher than the comparison threshold, that is, the power supply voltage is higher than When the circuit works in the safe area, the power-on reset system outputs a reset failure signal, and the whole chip circuit works normally. [0003] During the power-on process of the s...

AI Technical Summary

Problems solved by technology

[0006] The programmable power-on reset system provided by the present invention solves the problems of poor reliability of the power-on reset circuit system of the existing battery-powered consumer and medical electronic products, insufficient programming, etc.

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