Single-chip microcomputer self-outage restarting circuit

Abstract

The invention discloses a single-chip microcomputer self-outage restarting circuit which is connected with a single-chip microcomputer. The single-chip microcomputer self-outage restarting circuit comprises a switch chip U1, a reset chip U2, a P channel MOS pipe Q1, an N channel MOS pipe Q2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a power supply VCC and a controlled power supply VCC_CTRL. When the single-chip microcomputer is halted due to some fault, the watchdog signal output end of the single-chip microcomputer stops outputting watchdog signals; when the reset chip does not receive the watchdog signals when exceeding the preset deadline, the reset signal output end of the reset chip outputs the low level; due to the fact that the normally open end of the switch chip U1 is connected with the public end of the switch chip U1, the grid voltage of the N channel MOS pipe Q2 is driven down, the N channel MOS pipe Q2 is disconnected, the drain voltage of the N channel MOS pipe Q2 is driven high by the resistor R3, the grid voltage of the P channel MOS pipe Q1 is driven high, the P channel MOS pipe Q1 is disconnected, the outage of the controlled power supply VCC_CTRL is achieved, the power supply VCC maintains a power-on state, and the circuit is started again.

Description

technical field [0001] The invention relates to the technical field of embedded systems, in particular to a single-chip microcomputer self-power-off restart circuit. Background technique [0002] At present, the single-chip microcomputer reset circuit is usually realized by a special reset chip. However, for a relatively strong interference environment, such as an online detection line of a transmission line, etc., the special reset chip cannot reset the single-chip microcomputer normally due to some reason, causing a crash. At this time, only by cutting off the single-chip microcomputer After the power supply remains off for a few seconds, the system can only work normally after being powered on again. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a single-chip microcomputer self-power-off restarting circuit. When the watchdog signal is not received within the preset time limit, the re...

AI Technical Summary

Problems solved by technology

[0002] At present, the single-chip microcomputer reset circuit is usually realized by a special reset chip. However, for a relatively strong interference environment, such as an online detection line of a transmission line, etc., the special reset chip cannot reset t

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