CN104423515A - Low-level reset circuit - Google Patents
Low-level reset circuit Download PDFInfo
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- CN104423515A CN104423515A CN201310373458.7A CN201310373458A CN104423515A CN 104423515 A CN104423515 A CN 104423515A CN 201310373458 A CN201310373458 A CN 201310373458A CN 104423515 A CN104423515 A CN 104423515A
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- chip microcomputer
- switch pipe
- switching tube
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/24—Resetting means
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a low-level reset circuit which is applied to a single-chip microcomputer to continuously output high-level signals from the output end. The low-level reset circuit comprises a first switching tube, a second switching tube, a first resistor, a second resistor, a third resistor and a fourth resistor; the single-chip microcomputer comprises a power supply pin, a detecting pin, a reset pin and an output pin. According to the low-level reset circuit, a system can be rest at a low level through the first switching tube, the second switching tube and a plurality of resistors and other elements when the voltage of the outside DC power is not greater than the internal preset voltage of the single-chip microcomputer, and therefore, the high level voltage can be continuously output through the output end of the low-level reset circuit; the low-level reset circuit is quick to respond, simple and convenient in structure, and easy to be operated.
Description
Technical field
The present invention relates to a kind of reset circuit, particularly relate to a kind of low-level reset circuit.
Background technology
In chip in electronic product, how reset circuit can be used.If reset effect is not good, system will be caused normally to work, as the abnormal occurrence such as maybe can not to start shooting that crashes.
Existing reset circuit many employings switch realizes resetting, and the reset circuit reaction velocity of this mode is comparatively slow, and circuit is more complicated.
Summary of the invention
Technical matters to be solved by this invention is, provides a kind of low-level reset circuit, can improve reaction velocity, simplifies circuit structure.
In order to solve the problems of the technologies described above, The embodiment provides a kind of low-level reset circuit, be applied to single-chip microcomputer to continue to export high level signal at the output terminal of described low-level reset circuit, described low-level reset circuit comprises the first switching tube, second switch pipe, the first resistance, the second resistance, the 3rd resistance and the 4th resistance, described single-chip microcomputer comprises power supply pin, detects pin, resetting pin and output pin, the power supply pin of described single-chip microcomputer is connected to extraneous direct current to start described single-chip microcomputer, the detection pin of described single-chip microcomputer is connected to described extraneous direct current, to obtain the galvanic voltage signal in the described external world, according to described voltage signal, the output pin of described single-chip microcomputer exports low and high level signal, and exports reset signal at the resetting pin of described single-chip microcomputer, the control end of described first switching tube is connected to the output pin of described single-chip microcomputer through described first resistance, the first end of described first switching tube is connected to the control end of described second switch pipe, the second end ground connection of described first switching tube, the control end of described second switch pipe is also connected to described extraneous direct current through described second resistance, the first end of described second switch pipe is connected to described extraneous direct current through described 3rd resistance, the first end of described second switch pipe is also connected to the resetting pin of described single-chip microcomputer, to receive the reset signal exported from the resetting pin of described single-chip microcomputer, the first end of described second switch pipe is also connected to the control end of described first switching tube through described 4th resistance, so that described reset signal is fed back to described first switching tube, thus make described first switching tube conducting and the cut-off of described second switch pipe, and then make the first end of described second switch pipe continue as the output terminal of described low-level reset circuit to export high level signal.
Wherein, the detection pin of described single-chip microcomputer gets the galvanic voltage in the described external world, the preset voltage value of the galvanic magnitude of voltage in the more described external world of described single-chip microcomputer and described single-chip microcomputer inside, when the galvanic magnitude of voltage in the described external world is greater than the detection signal of internal preset magnitude of voltage of described single-chip microcomputer, the output pin of described single-chip microcomputer exports the control end of high level signal to described first switching tube, control described first switching tube conducting and the cut-off of described second switch pipe, the first end place of described second switch pipe exports high level signal.
Wherein, the detection pin of described single-chip microcomputer gets the galvanic voltage in the described external world, the preset voltage value of the galvanic magnitude of voltage in the more described external world of described single-chip microcomputer and described single-chip microcomputer inside, when the galvanic magnitude of voltage in the described external world is less than or equal to the detection signal of internal preset magnitude of voltage of described single-chip microcomputer, the output pin output low level signal of described single-chip microcomputer is to the control end of described first switching tube, control described first switching tube cut-off and the conducting of described second switch pipe, the first end place output low level signal of described second switch pipe; Simultaneously, the reset signal of the resetting pin output of described single-chip microcomputer is sent to the first end of described second switch pipe, the first end triggering described second switch pipe obtains high level signal, and through described 5th resistance feedback to the control end of described first switching tube, control described first switching tube conducting and the cut-off of described second switch pipe, the first end place of described second switch pipe exports high level signal.
Wherein, described low-level reset circuit also comprises the 5th resistance, the control end of described first switching tube is connected to the first end of described first resistance, second end of described first resistance is connected to the output terminal of described single-chip microcomputer, second end of described first resistance is also through described 5th resistance eutral grounding, and described 5th resistance is used for dividing potential drop.
Wherein, described first switching tube and described second switch pipe are NPN type triode; The control end of described first switching tube is base stage, and the first end of described first switching tube is collector, and the second end of described first switching tube is emitter; The control end of described second switch pipe is base stage, and the first end of described second switch pipe is collector, and the second end of described second switch pipe is emitter.
Wherein, the internal preset magnitude of voltage of described single-chip microcomputer is 12V.
Wherein, the model of described single-chip microcomputer is ATtiny13.
To sum up, the low-level reset circuit that the embodiment of the present invention provides, by the first switching tube and the components and parts such as second switch pipe and multiple resistance, achieve when extraneous galvanic magnitude of voltage is less than or equal to the internal preset magnitude of voltage of single-chip microcomputer, system will low level reset, thus make the output terminal of low-level reset circuit, namely the first end of described second switch pipe continues output high level voltage.This low-level reset circuit is swift in response, and circuit structure succinctly facilitates, and is easy to realize.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of the low-level reset circuit that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Below with reference to the accompanying drawings embodiments of the invention are described.See Fig. 1, it is the circuit diagram of the low-level reset circuit 100 that the embodiment of the present invention provides.Low-level reset circuit 100 is applied to single-chip microcomputer U1, to continue to export high level signal at the output terminal of low-level reset circuit 100.
Single-chip microcomputer U1 comprises power supply pin 8 pin, detects pin 2 pin, resetting pin 1 pin and output pin 7 pin.Low-level reset circuit 100 comprises the first switching tube Q1, second switch pipe Q2, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4.The grounding leg 4 pin ground connection of described single-chip microcomputer U1.
Power supply pin 8 pin of single-chip microcomputer U1 is connected to extraneous direct current VCC to start single-chip microcomputer U1, detection pin 2 pin of single-chip microcomputer U1 is connected to extraneous direct current VCC, to obtain the voltage signal of extraneous direct current VCC, and export low and high level signal according to voltage signal at output pin 7 pin of single-chip microcomputer U1.Resetting pin 2 heel of single-chip microcomputer U1 exports reset signal according to detection signal.In present embodiment, the model of single-chip microcomputer U1 is ATtiny13.
The control end of the first switching tube Q1 is connected to output pin 7 pin of single-chip microcomputer U1 through the first resistance R1, the first end of the first switching tube Q1 is connected to the control end of second switch pipe Q2, the second end ground connection of the first switching tube Q1.
The control end of second switch pipe Q2 is also connected to extraneous direct current VCC through the second resistance R2.The first end of second switch pipe Q2 is connected to extraneous direct current VCC through the 3rd resistance R3.The first end of second switch pipe Q2 is also connected to resetting pin 1 pin of single-chip microcomputer U1, to receive the reset signal exported from resetting pin 1 pin of single-chip microcomputer U1.The first end of second switch pipe Q2 is also connected to the control end of the first switching tube Q1 through the 4th resistance R4, reset signal to be fed back to the first switching tube Q1.
Low-level reset circuit 100 also comprises the 5th resistance R5.The control end of the first switching tube Q1 is connected to the first end of the first resistance R1, and second end of the first resistance R1 is connected to the output terminal of single-chip microcomputer U1, and second end of the first resistance R1 is also through the 5th resistance R5 ground connection, and the 5th resistance R5 is used for dividing potential drop.
In the present embodiment, the first switching tube Q1 and second switch pipe Q2 is NPN type triode.The control end of the first switching tube Q1 is base stage, and the first end of the first switching tube Q1 is collector, and second end of the first switching tube Q1 is emitter.The control end of second switch pipe Q2 is base stage, and the first end of second switch pipe Q2 is collector, and second end of second switch pipe Q2 is emitter.In other embodiments, the first switching tube Q1 and second switch pipe Q2 can adopt PNP type triode or field effect transistor.
The principle of work of low-level reset circuit 100 and single-chip microcomputer U1 is:
When detection pin 2 pin of single-chip microcomputer U1 gets the voltage of extraneous direct current VCC, the preset voltage value of the galvanic magnitude of voltage in the more described external world of described single-chip microcomputer and described single-chip microcomputer inside.When the galvanic magnitude of voltage in the described external world is greater than the detection signal of internal preset magnitude of voltage of single-chip microcomputer U1, output pin 7 pin of single-chip microcomputer U1 exports the control end of high level signal to the first switching tube Q1, control the first switching tube Q1 conducting, thus drag down the voltage of second switch pipe Q2 and second switch pipe Q2 is ended, thus export high level signal at the first end place of second switch pipe Q2.
When detection pin 2 pin of single-chip microcomputer U1 gets the voltage of extraneous direct current VCC, the preset voltage value of the galvanic magnitude of voltage in the more described external world of described single-chip microcomputer and described single-chip microcomputer inside.When the galvanic magnitude of voltage in the described external world is less than or equal to the detection signal of internal preset magnitude of voltage of single-chip microcomputer U1, the control end of output pin 7 pin output low level signal to the first switching tube Q1 of single-chip microcomputer U1, control the first switching tube Q1 to end and second switch pipe Q2 conducting, thus at the first end place output low level signal of second switch pipe Q2.Simultaneously, the reset signal of the resetting pin 1 pin output of single-chip microcomputer U1 is sent to the first end of second switch pipe Q2, the first end triggering second switch pipe Q2 obtains high level signal, and the control end of the first switching tube Q1 is fed back to through the 5th resistance R5, control the first switching tube Q1 conducting and second switch pipe Q2 ends, thus export high level signal at the first end place of second switch pipe Q2.
In present embodiment, the preset voltage value of single-chip microcomputer U1 inside is 12V.
The low-level reset circuit 100 that the embodiment of the present invention provides, by the first switching tube Q1 and the components and parts such as second switch pipe Q2 and multiple resistance, achieve when the magnitude of voltage of extraneous direct current VCC is less than or equal to the internal preset magnitude of voltage of single-chip microcomputer U1, system will low level reset, thus make the output terminal of low-level reset circuit 100, namely the first end of described second switch pipe Q2 continues output high level voltage.This low-level reset circuit 100 is swift in response, and circuit structure succinctly facilitates, and is easy to realize.
Above-described embodiment, does not form the restriction to this technical scheme protection domain.The amendment done within any spirit at above-mentioned embodiment and principle, equivalently to replace and improvement etc., within the protection domain that all should be included in this technical scheme.
Claims (7)
1. a low-level reset circuit, be applied to single-chip microcomputer to continue to export high level signal at the output terminal of described low-level reset circuit, it is characterized in that, described low-level reset circuit comprises the first switching tube, second switch pipe, the first resistance, the second resistance, the 3rd resistance and the 4th resistance, described single-chip microcomputer comprises power supply pin, detects pin, resetting pin and output pin, the power supply pin of described single-chip microcomputer is connected to extraneous direct current to start described single-chip microcomputer, the detection pin of described single-chip microcomputer is connected to described extraneous direct current, to obtain the galvanic voltage signal in the described external world, according to described voltage signal, the output pin of described single-chip microcomputer exports low and high level signal, and exports reset signal at the resetting pin of described single-chip microcomputer, the control end of described first switching tube is connected to the output pin of described single-chip microcomputer through described first resistance, the first end of described first switching tube is connected to the control end of described second switch pipe, the second end ground connection of described first switching tube, the control end of described second switch pipe is also connected to described extraneous direct current through described second resistance, the first end of described second switch pipe is connected to described extraneous direct current through described 3rd resistance, the first end of described second switch pipe is also connected to the resetting pin of described single-chip microcomputer, to receive the reset signal exported from the resetting pin of described single-chip microcomputer, the first end of described second switch pipe is also connected to the control end of described first switching tube through described 4th resistance, so that described reset signal is fed back to described first switching tube, thus make described first switching tube conducting and the cut-off of described second switch pipe, and then make the first end of described second switch pipe continue as the output terminal of described low-level reset circuit to export high level signal.
2. low-level reset circuit as claimed in claim 1, it is characterized in that, the detection pin of described single-chip microcomputer gets the galvanic voltage in the described external world, the preset voltage value of the galvanic magnitude of voltage in the more described external world of described single-chip microcomputer and described single-chip microcomputer inside, when the galvanic magnitude of voltage in the described external world is greater than the detection signal of internal preset magnitude of voltage of described single-chip microcomputer, the output pin of described single-chip microcomputer exports the control end of high level signal to described first switching tube, control described first switching tube conducting and the cut-off of described second switch pipe, the first end place of described second switch pipe exports high level signal.
3. low-level reset circuit as claimed in claim 2, it is characterized in that, the detection pin of described single-chip microcomputer gets the galvanic voltage in the described external world, the preset voltage value of the galvanic magnitude of voltage in the more described external world of described single-chip microcomputer and described single-chip microcomputer inside, when the galvanic magnitude of voltage in the described external world is less than or equal to the detection signal of internal preset magnitude of voltage of described single-chip microcomputer, the output pin output low level signal of described single-chip microcomputer is to the control end of described first switching tube, control described first switching tube cut-off and the conducting of described second switch pipe, the first end place output low level signal of described second switch pipe, simultaneously, the reset signal of the resetting pin output of described single-chip microcomputer is sent to the first end of described second switch pipe, the first end triggering described second switch pipe obtains high level signal, and through described 5th resistance feedback to the control end of described first switching tube, control described first switching tube conducting and the cut-off of described second switch pipe, the first end place of described second switch pipe exports high level signal.
4. low-level reset circuit as claimed in claim 3, it is characterized in that, described low-level reset circuit also comprises the 5th resistance, the control end of described first switching tube is connected to the first end of described first resistance, second end of described first resistance is connected to the output terminal of described single-chip microcomputer, second end of described first resistance is also through described 5th resistance eutral grounding, and described 5th resistance is used for dividing potential drop.
5. low-level reset circuit as claimed in claim 4, it is characterized in that, described first switching tube and described second switch pipe are NPN type triode; The control end of described first switching tube is base stage, and the first end of described first switching tube is collector, and the second end of described first switching tube is emitter; The control end of described second switch pipe is base stage, and the first end of described second switch pipe is collector, and the second end of described second switch pipe is emitter.
6. low-level reset circuit as claimed in claim 5, it is characterized in that, the internal preset magnitude of voltage of described single-chip microcomputer is 12V.
7. low-level reset circuit as claimed in claim 1, it is characterized in that, the model of described single-chip microcomputer is ATtiny13.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310373458.7A CN104423515B (en) | 2013-08-23 | 2013-08-23 | A kind of low-level reset circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310373458.7A CN104423515B (en) | 2013-08-23 | 2013-08-23 | A kind of low-level reset circuit |
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| CN104423515A true CN104423515A (en) | 2015-03-18 |
| CN104423515B CN104423515B (en) | 2019-02-22 |
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| CN201310373458.7A Active CN104423515B (en) | 2013-08-23 | 2013-08-23 | A kind of low-level reset circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019015087A1 (en) * | 2017-07-20 | 2019-01-24 | 西安中兴新软件有限责任公司 | A startup signal processing method and device |
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| CN104423515B (en) | 2019-02-22 |
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