CN217008193U

CN217008193U - Watchdog circuit composed of resistance-capacitance passive devices

Info

Publication number: CN217008193U
Application number: CN202220309305.0U
Authority: CN
Inventors: 黄龙; 冷小威; 徐志华; 姜猛; 蔡常丰; 郭翔峰
Original assignee: Shenzhen Rishengzhi Electronics Technology Co ltd
Current assignee: Shenzhen Rishengzhi Electronics Technology Co ltd
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-07-19
Anticipated expiration: 2032-02-16

Abstract

The application provides a watchdog circuit that passive device of resistance-capacitance constitutes, including input IN, input IN connects electric capacity C1, the one end that input IN was kept away from to electric capacity C1 is connected with resistance R1, the one end that electric capacity C1 was kept away from to resistance R1 is connected with triode Q1, triode Q1's emitter ground connection, triode Q1's collecting electrode is connected with resistance R3, the one end that triode Q1 was kept away from to resistance R3 is connected with triode Q2, triode Q2's emitter ground connection, triode Q2's collecting electrode is connected with output OUT 1. This application is through this watchdog circuit that sets up, this scheme constitutes monitoring circuit through some resistances, electric capacity, passive devices commonly used such as diode and triode, realizes the control and the reseing to the chip, compares with prior art, this watchdog circuit need not the power supply when using, also need not additionally to increase the chip, the passive device of use is common device in the circuit, the price is low for whole use cost greatly reduced, the reliability is high.

Description

Watchdog circuit composed of resistance-capacitance passive devices

Technical Field

The utility model relates to the technical field of watchdog circuits, in particular to a watchdog circuit consisting of resistance-capacitance passive devices.

Background

The watchdog, which is essentially a timer circuit, generally has an input called a feeding dog and an output connected to a reset terminal of another part, generally to the single chip, and functions to periodically check the internal conditions of the chip, and to issue a reset signal to the chip in case of an error, and the watchdog command has the highest priority in program interruption.

The existing watchdog circuit is based on an ASIC special chip, the use cost is high, independent power supply is needed, and when the chip fails, the watchdog is invalid, so that the use is influenced. Therefore, we improve this and propose a watchdog circuit composed of RC passive devices.

Disclosure of Invention

The utility model aims to: aiming at the problem that the existing watchdog circuit is based on an ASIC special chip, the use cost is high, independent power supply is needed, and when the chip fails, the watchdog is invalid, so that the use is influenced.

In order to achieve the above purpose, the utility model provides the following technical scheme:

the watchdog circuit is composed of a resistance-capacitance passive device to improve the above problem.

The present application is specifically such that:

including input IN, input IN connects electric capacity C1, the one end that input IN was kept away from to electric capacity C1 is connected with resistance R1, the one end that electric capacity C1 was kept away from to resistance R1 is connected with triode Q1, triode Q1's emitter ground, triode Q1's collecting electrode is connected with resistance R3, the one end that triode Q1 was kept away from to resistance R3 is connected with triode Q2, triode Q2's emitter ground, triode Q2's collecting electrode is connected with output OUT 1.

As a preferable technical solution of the present application, a diode VD is connected between the capacitor C1 and the resistor R1, and an anode of the diode VD is grounded.

As a preferable technical solution of the present application, a resistor R2 and a capacitor C2 are connected between the resistor R1 and the transistor Q1, and both the resistor R2 and the capacitor C2 are grounded.

As a preferable technical solution of the present application, a capacitor C3, a resistor R4 and a resistor R5 are connected between the resistor R3 and the transistor Q2, the capacitor C3 and the resistor R5 are both grounded, and the resistor R4 is connected to VDD.

As a preferred embodiment of the present invention, a reset unit is connected to the output terminal OUT 1.

As a preferred embodiment of the present invention, the reset unit includes an output terminal OUT2, the output terminal OUT2 is connected to an output terminal OUT1, and a capacitor C4 and a resistor R6 are connected between the output terminals OUT2 and OUT 1.

As a preferred technical solution of the present application, the ends of the capacitor C4 and the resistor R6, which are far away from the output end OUT1, are both grounded, the emitter of the transistor Q2 is grounded in a digital manner or grounded to the ground, and the rest of the components are grounded in an analog manner.

Compared with the prior art, the utility model has the following beneficial effects:

in the scheme of the application:

through this watchdog circuit that sets up, this scheme constitutes monitoring circuit through passive devices commonly used such as some resistances, electric capacity, diode and triode, realizes the control and the reseing to the chip, compares with prior art, and this watchdog circuit need not the power supply when using, also need not additionally to increase the chip, and the passive device of use is common device in the circuit, and the price is low for whole use cost greatly reduced, the reliability is high.

Drawings

FIG. 1 is a schematic diagram of a watchdog circuit formed by RC passive devices provided in the present application;

fig. 2 is a schematic diagram of a watchdog circuit formed by the rc passive devices provided in the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.

Thus, the following detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model as claimed, but is merely representative of some embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and such terms are used for convenience of description and simplification of the description, and do not refer to or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

As shown IN fig. 1 and fig. 2, the present embodiment provides a watchdog circuit composed of a resistance-capacitance passive device, which includes an input terminal IN, where the input terminal IN is connected to a capacitor C1, one end of the capacitor C1 far from the input terminal IN is connected to a resistor R1, one end of the resistor R1 far from the capacitor C1 is connected to a transistor Q1, the resistor R1 is connected to a base set of a transistor Q1, an emitter of the transistor Q1 is grounded, a collector of the transistor Q1 is connected to a resistor R3, one end of the resistor R3 far from a transistor Q1 is connected to a transistor Q2, the resistor R3 is connected to a base set of a transistor Q2, an emitter of the transistor Q2 is grounded, and a collector of the transistor Q2 is connected to an output terminal OUT 1.

As shown in fig. 1 and 2, in addition to the above embodiment, in a preferred embodiment, a diode VD is connected between the capacitor C1 and the resistor R1, the anode of the diode VD is grounded, the cathode of the diode VD is connected between the capacitor C1 and the resistor R1, and the anode of the diode D1 is grounded to function as a current stabilizer and a protection circuit.

As shown in fig. 1 and fig. 2, as a preferred embodiment, in addition to the above mode, a resistor R2 and a capacitor C2 are connected between the resistor R1 and the transistor Q1, the resistor R2 and the capacitor C2 are both grounded, and the capacitor is grounded to ensure that the ground potential is 0, which is done to ensure that electrical components are not damaged.

As shown in fig. 1 and 2, in addition to the above embodiment, a capacitor C3, a resistor R4 and a resistor R5 are connected between the resistor R3 and the transistor Q2, the capacitor C3 and the resistor R5 are all grounded, and the resistor R4 is connected to VDD.

As shown in fig. 1, in addition to the above-described embodiments, in a preferred embodiment, a reset unit is connected to the output terminal OUT 1;

the reset part comprises an output end OUT2, an output end OUT2 is connected with an output end OUT1, and a capacitor C4 and a resistor R6 are connected between an output end OUT2 and an output end OUT 1;

one ends of the capacitor C4 and the resistor R6, which are far away from the output end OUT1, are grounded, the emitter of the triode Q2 is grounded in a digital grounding mode or grounded, and the rest parts are grounded in an analog grounding mode;

the capacitor C4 and the resistor R6 form a reset circuit, and the reset of the monitored chip is accelerated.

Specifically, the watchdog circuit that this resistance-capacitance passive devices constitutes when during operation/use: the input end IN and the output end OUT2 are connected with a monitored chip, the monitored chip sends OUT pulses to the input end IN, the pulses reach the resistor R1 through the capacitor C1, then reach the triode Q1 through the resistor R1, at the moment, the triode Q1 is pulled down, the capacitor C1 is difficult to charge, once the dead halt occurs, the pulses disappear, due to the isolation characteristic of the capacitor C1, at the moment, the triode Q1 is pulled up, and the pulses are output through the output end OUT2 after passing through the resistor R3 and the electrode tube Q2 and reach the monitored chip, so that the monitored chip is restarted.

The above embodiments are only used to illustrate the present invention and not to limit the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and therefore, any modifications or equivalents of the present invention may be made; but all technical solutions and modifications thereof without departing from the spirit and scope of the present invention are encompassed in the claims of the present invention.

Claims

1. The utility model provides a watchdog circuit that resistance-capacitance passive device constitutes, includes input IN, its characterized IN that, input IN connects electric capacity C1, the one end that input IN was kept away from to electric capacity C1 is connected with resistance R1, the one end that electric capacity C1 was kept away from to resistance R1 is connected with triode Q1, triode Q1's emitter ground, triode Q1's collecting electrode is connected with resistance R3, the one end that triode Q1 was kept away from to resistance R3 is connected with triode Q2, triode Q2's emitter ground, triode Q2's collecting electrode is connected with output OUT 1.

2. The watchdog circuit of claim 1, wherein a diode VD is connected between the capacitor C1 and the resistor R1, and an anode of the diode VD is grounded.

3. The watchdog circuit of claim 2, wherein a resistor R2 and a capacitor C2 are connected between the resistor R1 and the transistor Q1, and the resistor R2 and the capacitor C2 are both grounded.

4. The watchdog circuit of claim 3, wherein a capacitor C3, a resistor R4 and a resistor R5 are connected between the resistor R3 and the transistor Q2, the capacitor C3 and the resistor R5 are both grounded, and the resistor R4 is connected to VDD.

5. The watchdog circuit of claim 4, wherein the output terminal OUT1 is connected to a reset portion.

6. The watchdog circuit of claim 5, wherein the reset unit comprises an output terminal OUT2, the output terminal OUT2 is connected to the output terminal OUT1, and a capacitor C4 and a resistor R6 are connected between the output terminal OUT2 and the output terminal OUT 1.

7. The watchdog circuit of claim 6, wherein the capacitor C4 and the resistor R6 are grounded at a terminal thereof remote from the output terminal OUT1, the emitter of the transistor Q2 is grounded in a digital manner or a ground manner, and the rest of the components are grounded in an analog manner.