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Watchdog circuit with power supply managing function

A technology of power management and watchdog, which is applied in the field of watchdog circuit, can solve the problem that the circuit cannot realize the cold start function, etc.

Inactive Publication Date: 2013-01-09
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a watchdog circuit with power management function, which overcomes the deficiency that the existing watchdog circuit cannot realize the cold start function

Method used

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Embodiment Construction

[0033] The specific structure and embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] figure 1 Among them, U1 is the watchdog circuit, U2 is the monitored microprocessor, U1 and U2 are connected through VDD3, WDI, EN and nRST, where VDD3 is the working power of the monitored microprocessor, and WDI is the dog feeding signal terminal , EN is the enable control terminal, and nRST is the reset signal output terminal.

[0035] figure 2 Among them, U1 is a programmable device, Q1 is a P-channel field effect transistor, Q2 is a PNP transistor, Q3 is an NPN transistor, S1 is a button switch, R1, R2, R3, R4, R5, R6, R7 are resistors, and C1 is a capacitor . WDI is the feed signal input terminal of the watchdog circuit, EN is the enable control input terminal of the watchdog circuit, nRST is the reset signal output terminal, VDD1 is the working power supply of the watchdog circuit, VDD2 is the power input te...

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Abstract

The invention relates to a watchdog circuit with a power supply managing function. The watchdog circuit consists of a programmable device U1 with 8 pins, a P-channel field-effect tube Qi, a plug-and-play (PNP) audion Q2, an NPN audion Q3, a manual button switch S1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C1. The watchdog circuit is connected with a monitored microprocessor through a power output end VDD3, a watchdog feeding-dog signal input end WDI, a watchdog enable control input end EN and a reset signal output end nRST. By adopting the watchdog circuit consisting of the programmable device and several discrete elements, a cold start function is achieved under the condition that the warm start of the microprocessor is invalid, and the watchdog circuit is especially suitable for an unattended-operation device in a filed. The watchdog circuit further has a power-on reset function, a manual reset function and a function of preventing dead halt and no-revert in the upgrading process.

Description

technical field [0001] The invention relates to a watchdog circuit, in particular to a watchdog circuit with power management function. Background technique [0002] The reliability of electronic equipment has always been the goal pursued by engineers, especially in field applications, often due to lightning interference, voltage instability and other reasons, the microprocessor program runs away or crashes, resulting in abnormal operation of the equipment. In order to ensure that the microprocessor can automatically return to normal after being disturbed, a watchdog circuit is generally added to the circuit or watchdog software is added to the program, in order to reset the microprocessor when it detects that the system is working abnormally. It can be restored as soon as possible, which is especially important for unattended equipment. [0003] For this reason, domestic experts conducted in-depth research and invented various new watchdog circuits. ZL200510000229.6 discl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/00
Inventor 苏伟达吴允平李汪彪蔡声镇刘华松汪培胡文倩
Owner FUJIAN NORMAL UNIV
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