Supervisory module with power monitoring and power-up delay enable

Abstract

A monitoring module with power monitoring and power-on delay enable that can adjust the "feeding dog" cycle according to the startup time of the operating system. It is provided with a power supply monitoring circuit and a power-on delay enable control circuit between the module input terminal and the module output terminal. Among them, the power supply monitoring circuit is mainly a power supply monitoring chip, and the power-on delay enable control circuit is mainly a programmable device. . The input end of the module is the system power signal acquisition end; the output end of the module is connected to the programmable device, and the other end is respectively connected to the enabling end of the CPU, network card or other system application modules. The design of the present invention utilizes a power monitoring chip and a programmable device to realize a watchdog with multiple functions, which can effectively reduce program problems and problems that may be caused by the defects of the watchdog chip itself. And the implementation is simple and full-featured. It is convenient for application in embedded hardware system.

Description

Technical field [0001] The invention relates to the hardware design of an embedded system. Especially a watchdog hardware design with power monitoring and power-on delay. Background technique [0002] Generally, in a microcomputer system composed of a single-chip microcomputer, the work of the single-chip microcomputer is often interfered by external electromagnetic fields, causing the program to run away and fall into an infinite loop. The normal operation of the program is interrupted, and the system controlled by the single-chip microcomputer cannot Continuing to work will cause the entire system to fall into a stagnant state and cause unpredictable consequences. Therefore, for the consideration of real-time monitoring of the operating status of the single-chip microcomputer, a chip specially used for monitoring the operating status of the single-chip microcomputer program has been produced, commonly known as "Look Door dog" (called watchdog in English). [0003] Watchdog is d...

AI Technical Summary

Problems solved by technology

If the watchdog chip is used to directly control the reset of the main CPU, when the startup time of the embedded operating system is longer than 1.6s, the system has been reset before calling the "feed the dog" task, then the system will not be able to start and enter the working mode

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