CN205015831U

CN205015831U - Inside singlechip reset circuit of computer

Info

Publication number: CN205015831U
Application number: CN201520759523.4U
Authority: CN
Inventors: 李子昂
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-09-29
Filing date: 2015-09-29
Publication date: 2016-02-03
Anticipated expiration: 2025-09-29

Abstract

The utility model discloses an inside singlechip reset circuit of computer, including time base chip U1, resistance R1, electric capacity C1, diode VD1 and diode VD2, time base chip U1 pin 4 is connected respectively to resistance R1 one end, the time base chip U1 pin 8, resistance R2, resistance R3, singlechip U2 power end and power VCC, diode VD2 negative pole and time base chip U1 pin 2 are connected respectively to the resistance R1 other end, electric capacity C1 is connected to time base chip U1 pin 5, time base chip U1 pin 6 is connected respectively to time base chip U1 pin 3, the time base chip U1 pin 7, the resistance R2 other end, electric capacity C2 and diode VD1 negative pole, the anodal connecting resistance R3 other end respectively of diode VD1, the XTAL2 foot of electric capacity C3 and singlechip. The utility model discloses a control of chip NE555 can make timely the reseing of singlechip, has improved the stability that resets, especially adapted using widely.

Description

A kind of computer-internal reset circuit of SCM

Technical field

The utility model relates to a kind of reset circuit, specifically a kind of computer-internal reset circuit of SCM.

Background technology

Single-chip microcomputer uses widely in computer-internal, its reset also has various ways, Fig. 1 is a kind of use reset circuit more widely, but when wherein single-chip microcomputer U3 switches on power, before bringing into operation, require that in single-chip microcomputer U3, each several part circuit state should complete initialization, require that the reset terminal of single-chip microcomputer U3 applies one and is greater than 10ms low level pulse, the terminal voltage of electric capacity C can not be suddenlyd change, and reset terminal there will not be the low level of expectation for this reason, easily cause single-chip microcomputer out of control, produce misoperation.

Utility model content

The purpose of this utility model is to provide a kind of computer-internal reset circuit of SCM, to solve the problem proposed in above-mentioned background technology.

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

A kind of computer-internal reset circuit of SCM, base chip U1 when comprising, resistance R1, electric capacity C1, diode VD1 and diode VD2, base chip U1 pin 4 when described resistance R1 one end connects respectively, time base chip U1 pin 8, resistance R2, resistance R3, single-chip microcomputer U2 power end and power supply VCC, the resistance R1 other end connects diode VD2 negative pole and Shi Ji chip U1 pin 2 respectively, time base chip U1 pin 5 connect electric capacity C1, time base chip U1 pin 3 base chip U1 pin 6 when connecting respectively, time base chip U1 pin 7, the resistance R2 other end, electric capacity C2 and diode VD1 negative pole, diode VD1 positive pole is the contact resistance R3 other end respectively, the XTAL2 pin of electric capacity C3 and single-chip microcomputer, the XTAL1 pin of single-chip microcomputer connects the electric capacity C3 other end respectively, the electric capacity C2 other end, the electric capacity C1 other end, time base chip U1 pin 1 and diode VD2 positive pole ground connection.

As further program of the utility model: time described, base chip U1 adopts NE555.

As the utility model further scheme: described diode VD2 is voltage stabilizing diode.

Compared with prior art, the beneficial effects of the utility model are: the utility model adopts chip NE555 to control, and single-chip microcomputer can be made to reset timely, improve the stability of reset, be applicable to very much promoting the use of.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of existing reset circuit of SCM;

Fig. 2 is the circuit diagram of the utility model computer-internal reset circuit of SCM.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Refer to Fig. 2, in the utility model embodiment, a kind of computer-internal reset circuit of SCM, base chip U1 when comprising, resistance R1, electric capacity C1, diode VD1 and diode VD2, base chip U1 pin 4 when resistance R1 one end connects respectively, time base chip U1 pin 8, resistance R2, resistance R3, single-chip microcomputer U2 power end and power supply VCC, the resistance R1 other end connects diode VD2 negative pole and Shi Ji chip U1 pin 2 respectively, time base chip U1 pin 5 connect electric capacity C1, time base chip U1 pin 3 base chip U1 pin 6 when connecting respectively, time base chip U1 pin 7, the resistance R2 other end, electric capacity C2 and diode VD1 negative pole, diode VD1 positive pole is the contact resistance R3 other end respectively, the XTAL2 pin of electric capacity C3 and single-chip microcomputer, the XTAL1 pin of single-chip microcomputer connects the electric capacity C3 other end respectively, the electric capacity C2 other end, the electric capacity C1 other end, time base chip U1 pin 1 and diode VD2 positive pole ground connection.

Time base chip U1 adopt NE555.

Diode VD2 is voltage stabilizing diode.

Principle of work of the present utility model is: when in Fig. 1, single-chip microcomputer U3 switches on power, before bringing into operation, require that in single-chip microcomputer U3, each several part circuit state should complete initialization, require that the reset terminal of single-chip microcomputer U3 applies one and is greater than 10ms low level pulse for this reason, the terminal voltage of electric capacity C can not be suddenlyd change, reset terminal there will not be the low level of expectation, easily causes single-chip microcomputer out of control, produces misoperation.

Fig. 2 is the circuit diagram of the utility model computer-internal reset circuit of SCM, power supply VCC is 5V, connects the reference voltage that a stabilivolt VD2 produces 1.6V, when power supply momentary power failure at 2 pin of NE555, when voltage is lower than 4.7V, the output of NE555 is low level, and C3, by VD1 rapid discharge, makes single-chip microcomputer U2 reset terminal be low level, after power interruption recovering, VD1 ends, and C3 is charged by R3, forms negative-going pulse.

To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.

In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.

Claims

1. a computer-internal reset circuit of SCM, base chip U1 when comprising, resistance R1, electric capacity C1, diode VD1 and diode VD2, it is characterized in that, base chip U1 pin 4 when described resistance R1 one end connects respectively, time base chip U1 pin 8, resistance R2, resistance R3, single-chip microcomputer U2 power end and power supply VCC, the resistance R1 other end connects diode VD2 negative pole and Shi Ji chip U1 pin 2 respectively, time base chip U1 pin 5 connect electric capacity C1, time base chip U1 pin 3 base chip U1 pin 6 when connecting respectively, time base chip U1 pin 7, the resistance R2 other end, electric capacity C2 and diode VD1 negative pole, diode VD1 positive pole is the contact resistance R3 other end respectively, the XTAL2 pin of electric capacity C3 and single-chip microcomputer, the XTAL1 pin of single-chip microcomputer connects the electric capacity C3 other end respectively, the electric capacity C2 other end, the electric capacity C1 other end, time base chip U1 pin 1 and diode VD2 positive pole ground connection.

2. computer-internal reset circuit of SCM according to claim 1, is characterized in that, time described, base chip U1 adopts NE555.

3. computer-internal reset circuit of SCM according to claim 1, is characterized in that, described diode VD2 is voltage stabilizing diode.