CN205986824U - A stabilizing circuit for singlechip mouth output level - Google Patents
A stabilizing circuit for singlechip mouth output level Download PDFInfo
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- CN205986824U CN205986824U CN201620964819.4U CN201620964819U CN205986824U CN 205986824 U CN205986824 U CN 205986824U CN 201620964819 U CN201620964819 U CN 201620964819U CN 205986824 U CN205986824 U CN 205986824U
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Abstract
The utility model relates to a stabilizing circuit for singlechip mouth output level, stabilizing circuit include high level output circuit, low level output circuit and shaping circuit, high level output circuit and low level output circuit input between them all are connected with shaping circuit's output, and shaping circuit's input and singlechip mouth are connected, and high level output circuit and low level output circuit output between them all are connected with the load, the switch element that the series connection has first resistance, first high level to switch on between the input of high level output circuit and the output switch element, second resistance and first low level switched on, and the switch element that the series connection has third resistance, second low level to switch on between the input of low level output circuit and the output switch element, fourth resistance and second high level switched on. A life for solving the uncontrollable level of singlechip mouth and lead to burning out the danger of load and circuit device, the improved circuit safety in utilization, extension load and circuit device.
Description
Technical field
This utility model is related to the technical field of single-chip microcomputer mouth low and high level output, and more particularly, to one kind is used for single-chip microcomputer mouth
The stabilizing circuit of output level.
Background technology
In electrification reset or when certain interference, single-chip microcomputer mouth is not the controlled effective high level of output to single-chip microcomputer
Or low level, but high-impedance state, high-impedance state is common term in a digital circuit, refers to a kind of output shape of circuit
State, neither high level is not low level, depending on the circuit that specifically can connect below with it or load.At present, when load connects
Between single-chip microcomputer mouth and load, when entering single-chip microcomputer mouth, it is provided with the control circuit of the level occurring for control single chip computer mouth,
But the uncontrollable level of single-chip microcomputer mouth output makes load be in work or idle critical state, so easily produces and burns
Bad load and the danger of circuit devcie, lead to circuit to there is potential safety hazard, and reduce the service life of circuit devcie.
Utility model content
This utility model provides a kind of stabilizing circuit for single-chip microcomputer mouth output level, single in prior art for solving
Uncontrollable level and leads to burn out the danger of load and circuit devcie in piece machine mouth, improves circuit safety in utilization, extends negative
Load and the service life of circuit devcie.
For solving above-mentioned technical problem, this utility model provides following technical scheme to be solved：
A kind of stabilizing circuit for single-chip microcomputer mouth output level is it is characterised in that described stabilizing circuit includes high level
Output circuit, low level output circuit and shaping circuit；The input of high level output circuit and low level output circuit defeated
Enter end to be all connected with the outfan of shaping circuit, the input of shaping circuit is connected with single-chip microcomputer mouth, high level output circuit
The outfan of outfan and low level output circuit is all connected with load；Between the input of high level output circuit and outfan
It is connected in series with first resistor, the switch unit of the switch element, second resistance and the conducting of the first low level of the first high level conducting
Part, and be connected in series between the input of low level output circuit and outfan 3rd resistor, second low level conducting open
Close the switch element of element, the 4th resistance and the conducting of the second high level.
Shaping is carried out to the level of single-chip microcomputer mouth output, described shaping circuit is reverse shaping circuit, when single-chip microcomputer mouth is
During high level, low level is exported by reverse shaping circuit so that load is connected with low level output circuit, thus carrying for load
For low level.Further, described reverse shaping circuit includes switch element and the pull down resistor of low level conducting, described drop-down
Resistance is connected between the outfan of switch element and the ground of low level conducting, the input of high level output circuit and low level
The input of output circuit is all connected with pull down resistor.
Preferably, the switch element of described low level conducting is PNP triode, and its base stage is connected with single-chip microcomputer mouth, current collection
Pole is connected with pull down resistor, and emitter stage connects VCC supply voltage.
Carry out another kind of alternative technologies scheme of shaping as the level that single-chip microcomputer mouth is exported, described shaping circuit is
Positive shaping circuit.Further, described forward direction shaping circuit includes switch element and the pull-up resistor of high level conducting, described
Pull-up resistor is connected between the outfan of switch element and the VCC supply voltage of high level conducting, high level output circuit
Input is all connected with pull-up resistor with the input of low level output circuit.
Preferably, the switch element of described high level conducting is NPN triode, and its base stage is connected with single-chip microcomputer mouth, transmitting
Pole is connected to ground, and colelctor electrode connects pull-up resistor.
Further, as opening that the switch element of the first and second high level conductings, the first and second low levels turn on
Close the preferred version of element, the switch element of the first high level conducting is NPN triode, the outfan of its base stage and first resistor
It is connected, grounded emitter, colelctor electrode is connected with the input of second resistance；The switch element of the first low level conducting is PNP tri-
Pole pipe, its base stage is connected with the outfan of second resistance, and emitter stage meets VDD, and colelctor electrode is connected with load；Second low level conducting
Switch element be PNP triode, its base stage is connected with the outfan of 3rd resistor, and emitter stage meets VCC, colelctor electrode and the 4th electric
The input of resistance is connected；The switch element of the second high level conducting is the outfan phase of NPN triode, its base stage and the 4th resistance
Even, grounded emitter, colelctor electrode is connected with load.
, uncontrollable electricity in single-chip microcomputer mouth in the stabilizing circuit for single-chip microcomputer mouth output level that this utility model provides
At ordinary times, shaping circuit can be shaped as high level or low level square wave level the level of single-chip microcomputer mouth, when by shaping electricity
During road shaping output high level, high level output circuit works, and provides high level for load, when being exported by shaping circuit shaping
During low level, low level output circuit work, for load provide low level so that single-chip microcomputer mouth occur uncontrollable level when,
Can be still load supply high level or low level, rather than uncontrollable level, realize the normal work of circuit, it is to avoid circuit uses
Potential safety hazard, improve load and circuit devcie service life.
Brief description
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or in description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description are
Some embodiments of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the first embodiment of the stabilizing circuit that this utility model is used for single-chip microcomputer mouth output level；
Fig. 2 is the second embodiment of the stabilizing circuit that this utility model is used for single-chip microcomputer mouth output level.
Specific embodiment
Purpose, technical scheme and advantage for making this utility model embodiment are clearer, new below in conjunction with this practicality
Accompanying drawing in type embodiment, is clearly and completely described it is clear that being retouched to the technical scheme in this utility model embodiment
The embodiment stated is a part of embodiment of this utility model, rather than whole embodiments.Based on the enforcement in this utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, broadly fall into
The scope of this utility model protection.
As depicted in figs. 1 and 2, the present embodiment provides a kind of stabilizing circuit, in single-chip microcomputer mouth B electrification reset or appearance
Stablize the level of single-chip microcomputer mouth B, stabilizing circuit includes high level output circuit, low level output circuit and shaping during certain interference
Circuit, the wherein input of the input of high level output circuit and low level output circuit are all connected with the outfan of shaping circuit
Connect, the input of shaping circuit is connected with single-chip microcomputer mouth B, the outfan of high level output circuit and low level output circuit defeated
Go out end to be all connected with load A, high level output circuit is used for the work in shaping circuit output high level, provides high for load A
Level；Low level output circuit is used for the work in shaping circuit output low level, provides low level for load A（For example）.
As depicted in figs. 1 and 2, it is connected in series with first resistor R3, the first height between the input of high level output circuit and outfan
The switch element P1 of the switch element N2 of level conducting, second resistance R1 and the conducting of the first low level, and low level output circuit
Input and outfan between be connected in series with 3rd resistor R4, second low level conducting switch element P2, the 4th resistance
The R2 and switch element N1 of the second high level conducting.
Specifically, as shown in figure 1, shaping circuit can be reverse shaping circuit, that is, when single-chip microcomputer mouth B is high level,
Low level is exported by reverse shaping circuit so that load A is connected with low level output circuit, provide low level for load A；When
When single-chip microcomputer mouth B is low level, high level is exported by reverse shaping circuit so that load A is connected with high level output circuit,
There is provided high level for load A.In the present embodiment, reverse shaping circuit includes PNP triode P3 and pull down resistor R5, drop-down electricity
Resistance R5 is connected to the colelctor electrode of P3, for stablizing the base voltage of NPN triode N2, it is to avoid export high level in single-chip microcomputer mouth B
When lead to because P3 is not turned on high level output circuit input hanging, the base stage of P3 is connected with single-chip microcomputer mouth B, emitter stage
Connect VCC supply voltage, for example ,+5V.Specific work process is as follows：When single-chip microcomputer mouth B output high level, P3 is not turned on, by
In the presence of pull down resistor R5, the input of the input of high level output circuit and low level output circuit is low level, from
And the work of low level output circuit, provide ground for load A；When single-chip microcomputer mouth B output low level, P3 turns on, high level output
The input of the input of circuit and low level output circuit is high level, and for example ,+5V high level, thus high level output is electric
Road works, and provides vdd voltage for load A.In other alternate embodiment, reverse shaping circuit can be logic circuit,
Such as NAND gate, nor gate etc..
As shown in Fig. 2 as another middle alternative technologies scheme that single-chip microcomputer mouth B output level is carried out with shaping, shaping
Circuit is positive shaping circuit, that is, when single-chip microcomputer mouth B is high level, exports high level by positive shaping circuit so that bearing
Carry A to be connected with high level output circuit, provide high level for load A；When single-chip microcomputer mouth B is low level, by positive shaping
Circuit output low level, so that load A is connected with low level output circuit, provides low level for load A.In the present embodiment,
Positive shaping circuit includes high NPN triode N3 and pull-up resistor R6, and pull-up resistor R6 is connected to colelctor electrode and the VCC power supply of N3
Between voltage, N3 base stage is connected with single-chip microcomputer mouth B, N3 grounded emitter.Specific work process is as follows：When single-chip microcomputer mouth B output
During high level, N3 turns on, and the input of the input of high level output circuit and low level output circuit is high level, thus high
Electrical level output circuit works, and provides vdd voltage for load；When single-chip microcomputer mouth B output low level, P3 is not turned on, and high level is defeated
The input of the input and low level output circuit that go out circuit is low level, thus the work of low level output circuit, for load
There is provided ground.Stabilizing circuit avoids the damage when uncontrollable level in single-chip microcomputer mouth B, to circuit devcie and load A as mentioned above
Evil.In other alternate embodiment, positive shaping circuit can be logic circuit, such as OR gate and door etc..
Further, as opening that the switch element of the first and second high level conductings, the first and second low levels turn on
Close the preferred version of element, the switch element of the first high level conducting is NPN triode N2, and its base stage is defeated with first resistor R3
Go out end to be connected, grounded emitter, colelctor electrode is connected with the input of second resistance R1；First low level conducting switch element be
PNP triode P1, its base stage is connected with the outfan of second resistance R1, and emitter stage meets VDD, and colelctor electrode is connected with load A, is used for
There is provided VDD supply voltage when N2 and P1 turns on for load A；The switch element of the second low level conducting is PNP triode P2, its
Base stage is connected with the outfan of 3rd resistor R4, and emitter stage meets VCC, and colelctor electrode is connected with the input of the 4th resistance R2；Second
The switch element of high level conducting is NPN triode N1, its base stage is connected with the outfan of the 4th resistance R2, grounded emitter,
Colelctor electrode is connected with load A, for providing ground when P2 and N1 turns on for load A.
The stabilizing circuit for single-chip microcomputer mouth output level that this utility model provides, occurs uncontrollable in single-chip microcomputer mouth B
During level, shaping circuit can be shaped as high level or low level square wave level the level of single-chip microcomputer mouth B, when by shaping
During circuit shaping output high level, high level output circuit works, and provides high level for load A, when by shaping circuit shaping
During output low level, low level output circuit works, and provides low level so that uncontrollable electricity in single-chip microcomputer mouth B for load A
At ordinary times, can be still load A supply high level or low level rather than uncontrollable level, realize the normal work of circuit, it is to avoid electricity
The potential safety hazard that road uses, improves the service life of load A and circuit devcie.
Finally it should be noted that：Above example only in order to the technical solution of the utility model to be described, is not intended to limit；
Although being described in detail to this utility model with reference to the foregoing embodiments, it will be understood by those within the art that：
It still can be modified to the technical scheme described in foregoing embodiments, or wherein some technical characteristics are carried out etc.
With replacement；And these modifications or replacement, do not make the essence of appropriate technical solution depart from this utility model each embodiment technology
The spirit and scope of scheme.
Claims (8)
1. a kind of stabilizing circuit for single-chip microcomputer mouth output level it is characterised in that described stabilizing circuit to include high level defeated
Go out circuit, low level output circuit and shaping circuit；The input of high level output circuit and the input of low level output circuit
End be all connected with the outfan of shaping circuit, the input of shaping circuit is connected with single-chip microcomputer mouth, high level output circuit defeated
Go out end and the outfan of low level output circuit is all connected with load；Go here and there between the input of high level output circuit and outfan
Connection is connected with first resistor, the switch element of the switch element, second resistance and the conducting of the first low level of the first high level conducting,
And between the input of low level output circuit and outfan, it is connected in series with 3rd resistor, the switch unit of the second low level conducting
The switch element of part, the 4th resistance and the conducting of the second high level.
2. the stabilizing circuit for single-chip microcomputer mouth output level according to claim 1 is it is characterised in that described shaping is electric
Road is reverse shaping circuit.
3. the stabilizing circuit for single-chip microcomputer mouth output level according to claim 2 is it is characterised in that described reversely whole
Shape circuit includes switch element and the pull down resistor of low level conducting, and described pull down resistor is connected to the switch unit of low level conducting
Between the outfan of part and ground, the input of the input of high level output circuit and low level output circuit is all and pull down resistor
It is connected.
4. the stabilizing circuit for single-chip microcomputer mouth output level according to claim 3 is it is characterised in that described low level
The switch element of conducting is PNP triode, and its base stage is connected with single-chip microcomputer mouth, and colelctor electrode is connected with pull down resistor, and emitter stage is even
Connect VCC supply voltage.
5. the stabilizing circuit for single-chip microcomputer mouth output level according to claim 1 is it is characterised in that described shaping is electric
Road is positive shaping circuit.
6. the stabilizing circuit for single-chip microcomputer mouth output level according to claim 5 is it is characterised in that described forward direction is whole
Shape circuit includes switch element and the pull-up resistor of high level conducting, and described pull-up resistor is connected to the switch unit of high level conducting
Between the outfan of part and VCC supply voltage, the input of the input of high level output circuit and low level output circuit is equal
It is connected with pull-up resistor.
7. the stabilizing circuit for single-chip microcomputer mouth output level according to claim 6 is it is characterised in that described high level
The switch element of conducting is NPN triode, and its base stage is connected with single-chip microcomputer mouth, and emitter stage is connected to ground, and colelctor electrode connects pull-up
Resistance.
8. the stabilizing circuit for single-chip microcomputer mouth output level according to any one of claim 1-7 it is characterised in that
The switch element of the first high level conducting is NPN triode, and its base stage is connected with the outfan of first resistor, grounded emitter,
Colelctor electrode is connected with the input of second resistance；The switch element of the first low level conducting is PNP triode, its base stage and second
The outfan of resistance is connected, and emitter stage meets VDD, and colelctor electrode is connected with load；The switch element of the second low level conducting is PNP tri-
Pole pipe, its base stage is connected with the outfan of 3rd resistor, and emitter stage meets VCC, and colelctor electrode is connected with the input of the 4th resistance；The
The switch element of two high level conductings is NPN triode, its base stage is connected with the outfan of the 4th resistance, grounded emitter, collection
Electrode is connected with load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620964819.4U CN205986824U (en) | 2016-08-29 | 2016-08-29 | A stabilizing circuit for singlechip mouth output level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620964819.4U CN205986824U (en) | 2016-08-29 | 2016-08-29 | A stabilizing circuit for singlechip mouth output level |
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| Publication Number | Publication Date |
|---|---|
| CN205986824U true CN205986824U (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620964819.4U Active CN205986824U (en) | 2016-08-29 | 2016-08-29 | A stabilizing circuit for singlechip mouth output level |
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| CN (1) | CN205986824U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104352A (en) * | 2020-09-11 | 2020-12-18 | 厦门市美亚柏科信息股份有限公司 | Adapter circuit and equipment for emergency download mode of electronic equipment |
-
2016
- 2016-08-29 CN CN201620964819.4U patent/CN205986824U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104352A (en) * | 2020-09-11 | 2020-12-18 | 厦门市美亚柏科信息股份有限公司 | Adapter circuit and equipment for emergency download mode of electronic equipment |
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| GR01 | Patent grant |