CN206097092U

CN206097092U - Adjustable reset pulse's watchdog circuit

Info

Publication number: CN206097092U
Application number: CN201620800179.3U
Authority: CN
Inventors: 谢忠仁
Original assignee: Guangzhou Zhengtang Information Technology Co Ltd
Current assignee: Guangzhou Zhengtang Information Technology Co Ltd
Priority date: 2016-12-16
Filing date: 2016-12-16
Publication date: 2017-04-12
Anticipated expiration: 2026-12-16

Abstract

The utility model discloses an adjustable reset pulse's watchdog circuit, the dog circuit of feeding including being used for starting the watchdog carries out the reset circuit that resets with being used for to the watchdog it has been coupled the regulating circuit to feed between dog circuit and the reset circuit, the regulating circuit is coupled including first regulation branch road feed on the dog circuit for adjusting and feeding the dog cycle, it is including the monostable trigger UA and the charging circuit that can heavily trigger, the second regulating circuit is coupled reset circuit is last for adjust the reset pulse width, it is including the monostable trigger UB and the charging circuit that can heavily trigger, first regulating circuit with second regulating circuit looks mutual coupling connect. The core of this watchdog circuit lies in being provided with two monostable trigger that can heavily trigger and the repeated feedback circuit who resets of the equipment of enabling.

Description

A kind of watchdog circuit of adjustable reset pulse

Technical field

The utility model is related to a kind of watchdog circuit of adjustable reset pulse, simple with circuit, low cost, hello dog week Phase length and adjustable, reseting pulse width is adjustable, and the little advantage of power consumption.

Background technology

With the development of society, electronic equipment and automation control appliance all become increasingly complex, and many equipment are all adopted Central processing unit (CPU) processing the affairs of complexity, because work usually can be caused by being disturbed from external electromagnetic field The data corruption of various registers and internal memory, can cause program pointer mistake, not in program area, take out the programmed instruction of mistake Deng, endless loop can be all absorbed in, the normal operation of program is interrupted, and the system controlled by CPU cannot continue normal work, can cause Whole system is absorbed in dead state, and unpredictable consequence occurs, and in order to process this situation, most of designers adopt With increase house dog, with it come the operation of monitoring programme, continuous work is realized under unmanned state, and when program malfunctions, energy Carry out automatic recovery process.

Conventional hardware watchdog chip, hardware watchdog is the operation that make use of a timer to monitor main program, That is in the running of main program, we will reset to before in timing to timer.It is this existing Watchdog circuit, it is to fix nonadjustable that it feeds dog cycle, and its reset pulse is also to fix nonadjustable.

Utility model content

In view of the shortcomings of the prior art, the purpose of this utility model is to provide a kind of dog cycle length and can of feeding The watchdog circuit of tune, cheap, reset pulse length and adjustable adjustable reset pulse.

For achieving the above object, the utility model provides following technical scheme：

A kind of watchdog circuit of adjustable reset pulse, to include and feed dog circuit and for seeing for start house dog The reset circuit that door dog is resetted, in described feeding regulation circuit is coupled between dog circuit and reset circuit, the regulation electricity Road includes the first regulation branch road, is coupled on hello the dog circuit, and for adjusting the dog cycle is fed, and it includes Retargetable compiler Monostable trigger UA and its charging circuit；

Second adjusts circuit, is coupled on the reset circuit, and for adjusting reseting pulse width, it is included can touch again The monostable trigger UB for sending out and its charging circuit；

The first regulation circuit and the second regulation circuit are mutually coupled.

Used as improvement of the present utility model, described first adjusts circuit has hello dog input pin, and described second adjusts circuit With reset pulse output pin,

When hello the dog input pin transmits normal signal to the reset pulse output pin, the reset pulse output pin is not It is dynamic；

When hello the dog input pin transmission abnormality signal is to the reset pulse output pin, reset pulse output human hair combing waste Life overturns and generates reset signal and is transferred to reset circuit.

As further improvement of the utility model, it is being provided between dog input pin and reset pulse output pin so feeding Repeat feedback circuit, it is described to repeat that there is diode in feedback circuit.

Compared with prior art, the utility model has the advantage of：Watchdog circuit of the present utility model, circuit is simple, Low cost, dog cycle length and adjustable is fed, reseting pulse width is adjustable, and power consumption is little.

Description of the drawings

Fig. 1 is the first regulation branch road schematic diagram in the utility model embodiment；

Fig. 2 is the second regulation branch road schematic diagram in the utility model embodiment.

Specific embodiment

The embodiment to the watchdog circuit of adjustable reset pulse in the utility model that sees figures.1.and.2 is done furtherly It is bright.

As depicted in figs. 1 and 2, the present embodiment is a kind of watchdog circuit of adjustable reset pulse, is included for starting Hello dog circuit and the reset circuit for being resetted to house dog of house dog, feeds between dog circuit and reset circuit described Regulation circuit is coupled with, the regulation circuit includes the first regulation branch road, is coupled on hello the dog circuit, fed for adjusting In the dog cycle, it includes the monostable trigger UA and its charging circuit of Retargetable compiler；

Described first adjusts circuit has hello dog input pin CLK_IN, and there is the second regulation circuit reset pulse to export Pin RESET,

Repetition feedback circuit is being provided between dog input pin and reset pulse output pin so feeding, it is described to repeat to feed back electricity There is diode in road.

Specifically, UA, UB are the monostable trigger of two Retargetable compilers.R1, C1 are the charging circuit of UA, feed for control Dog cycle, C3, R7 are the charging circuits of UB modules, for controlling reset pulsewidth.WDT_EN is that house dog enables input pin, when WDT_EN for it is low be that house dog is invalid.

When the watchdog circuit is in running order, WDT_EN is external high level or hanging, and CLK_IN is to guard the gate The dog that feeds of dog is input into, and the cycle is not more than the maximum cycle of house dog work, and input pulse is as follows：

If the normal feeding-dog signal of CLK_IN can be received, RESET will be high level, and be failure to actuate；When CLK_IN pulses During loss, according to R1, the discharge time of C1, RESET_BEGIN ends produce upset, as follows：

The trigger of UB, RESET_IND ends, according to R7, C3 charging circuits, generate signal：, meanwhile, RESET ends generate Reset signal：.The signal of RESET_IND, feeds back to the input of house dog, begins preparing for the reset pulse in next cycle.

The above makes preferred embodiment of the present utility model, for the person of ordinary skill of the art without departing from this On the premise of utility model principle, some modifications and improvement can also be made, these also should be regarded as protection domain of the present utility model.

Claims

1. a kind of watchdog circuit of adjustable reset pulse, to include and feed dog circuit and for guarding the gate for start house dog The reset circuit that dog is resetted, it is characterised in that：

Regulation circuit is coupled between dog circuit and reset circuit in described feeding, the regulation circuit includes the first regulation Road, is coupled on hello the dog circuit, and for adjusting the dog cycle is fed, and it includes the monostable trigger UA of Retargetable compiler and its fills Circuit；

Second adjusts circuit, is coupled on the reset circuit, and for adjusting reseting pulse width, it includes Retargetable compiler Monostable trigger UB and its charging circuit；

2. the watchdog circuit of adjustable reset pulse according to claim 1, it is characterised in that：Described first adjusts circuit With dog input pin is fed, the second regulation circuit has reset pulse output pin,

When hello the dog input pin transmits normal signal to the reset pulse output pin, the reset pulse output pin is motionless；

When hello the dog input pin transmission abnormality signal is to the reset pulse output pin, the reset pulse output pin is turned over Turn and generate reset signal and be transferred to reset circuit.

3. the watchdog circuit of adjustable reset pulse according to claim 2, it is characterised in that：So feeding dog input pin Repetition feedback circuit is provided with and reset pulse output pin between, it is described to repeat that there is diode in feedback circuit.