CN104124952B - A kind of recognizable key circuit - Google Patents
A kind of recognizable key circuit Download PDFInfo
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- CN104124952B CN104124952B CN201410350915.5A CN201410350915A CN104124952B CN 104124952 B CN104124952 B CN 104124952B CN 201410350915 A CN201410350915 A CN 201410350915A CN 104124952 B CN104124952 B CN 104124952B
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Abstract
The present invention relates to technical field of single chip microcomputer, more particularly to a kind of recognizable key circuit.The present invention passes through circuit in parallel electric capacity C1 and resistance R1 on string between button K1 earth point so that controlling the button K1 of main equipment, button K1, electric capacity C1, resistance R1 constitute recognizable button by circuit ground in parallel electric capacity C1 and resistance R1.Rising waveform can be produced after button K1 is pressed, this wave character is influenceed and different by resistance R1 and electric capacity C1 values, and control chip U1 judges whether it is the button K1 that controls the main equipment specific function by comparing waveform.Because the electric capacity that the different key of main equipment is connected is different with resistance parameter, so waveform caused by each button is unique, button fingerprint can be used as, by compare button K1 pressing caused by waveform so as to reach only by button K1 control main equipment specific function purpose.
Description
Technical field
The present invention relates to technical field of single chip microcomputer, more particularly to a kind of recognizable key circuit.
Background technology
Need button and main equipment relatively independent in some specific occasions, it is desirable to which main equipment can only be by a or one is pressed
Key could operate specific function, and other similar button operations are without response, and button requires simple not transreplication, unpowered.It is existing
Button all identified by voltage, it is easy to replicate, needed if reaching above-mentioned function add chip, be not easy to realize
And cost is high.
The content of the invention
It is different by being connected to the button of control main equipment it is an object of the invention to propose a kind of recognizable key circuit
The resistance and electric capacity of size, it is unique to make waveform caused by each button, forms respective button fingerprint, passes through ratio
To waveform caused by button pressing so as to reaching the purpose only by this by key control main equipment specific function.
To use following technical scheme up to this purpose, the present invention：
A kind of recognizable key circuit, including：Resistance R69, button K1, the control chip U1 of main equipment, electric capacity C1 and electricity
R1, one end connection control chip U1 of resistance R69 power port are hindered, the other end of the R69 connects the one of button K1
End, the other end connection electric capacity C1 of the button K1 one end, resistance R1 one end, the other end, the resistance R1 of the electric capacity C1
The other end be grounded, one end of the button K1 is also connected with control chip U1 detection port.
Wherein, the resistance of the resistance R69 is that 1K Ω, the electric capacity C1 capacitance are 100nF, the resistance of the resistance R1
For 200 Ω.
Wherein, after the button K1 is pressed, button K1 power supplys are closed by control chip U1, after being spaced the scheduled time
Button K1 power supplys are opened again, to obtain waveform stable caused by button K1.
Beneficial effect：
The present invention passes through circuit in parallel electric capacity C1 and resistance R1 on string between button K1 earth point so that control master
By circuit ground in parallel electric capacity C1 and resistance R1, button K1, electric capacity C1, resistance R1 constitute recognizable the button K1 of equipment
Button.Rising waveform can be produced after button K1 is pressed, this wave character is influenceed and different, control by resistance R1 from electric capacity C1 values
Coremaking piece U1 by compare waveform judge whether be control the main equipment specific function button K1.Because the difference of main equipment is pressed
The electric capacity of key series connection is different with resistance parameter, so waveform caused by each button is unique, can be used as button
Fingerprint, reached only by button K1 control main equipment specific functions by comparing waveform caused by button K1 pressings
Purpose.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram for recognizable key circuit that the specific embodiment of the invention provides.
Embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by embodiment.
Fig. 1 is a kind of circuit diagram for recognizable key circuit that the specific embodiment of the invention provides.As shown in figure 1, this
A kind of described recognizable key circuit of invention, including：Including：Resistance R69, button K1, control chip U1, the electric capacity of main equipment
C1 and resistance R1, the resistance R69 one end connection control chip U1 power port, the other end connection button of the R69
K1 one end, the other end connection electric capacity C1 of the button K1 one end, resistance R1 one end, the other end of the electric capacity C1,
The resistance R1 other end is grounded, and one end of the button K1 is also connected with control chip U1 detection port.
The present invention passes through circuit in parallel electric capacity C1 and resistance R1 on string between button K1 earth point so that control master
By circuit ground in parallel electric capacity C1 and resistance R1, button K1, electric capacity C1, resistance R1 constitute recognizable the button K1 of equipment
Button.Rising waveform can be produced after button K1 is pressed, this wave character is influenceed and different, control by resistance R1 from electric capacity C1 values
Coremaking piece U1 by compare waveform judge whether be control the main equipment specific function button K1.Because the difference of main equipment is pressed
The electric capacity of key series connection is different with resistance parameter, so waveform caused by each button is unique, can be used as button
Fingerprint, reached only by button K1 control main equipment specific functions by comparing waveform caused by button K1 pressings
Purpose.
Preferably, the resistance of the resistance R69 is that 1K Ω, the electric capacity C1 capacitance are 100nF, the resistance of the resistance R1
It is worth for 200 Ω.It should be noted that control chip U1 of the present invention is existing known control chip, it is preferable that is
The control chip of MTK6589 series.
After the button K1 is pressed, button K1 power supplys are closed by control chip U1, beaten again after being spaced the scheduled time
Open button K1 power supplys, to obtain waveform stable caused by button K1.
Mode is preferably carried out as one kind, as the MIC that the main equipment is handset earphone, the button K1 is control
The button of MIC lockings.Pass through circuit in parallel electric capacity C1 and resistance R1 on string between button K1 earth point so that mobile phone ear
By electric capacity C1 and resistance R1 circuit ground in parallel, button K1, electric capacity C1, resistance R1 are just constituted by the MIC of machine and button K1
Recognizable button, rising waveform can be produced after now button K1 is pressed, what control chip U1 can detect according to detection port
Waveform signal compares waveform, judges whether it is the button for controlling MIC lockings., can be because having shake when button K1, which is pressed, to be started
After judging that button K1 is pressed, button K1 power supplys are closed by control chip U1, open button K1 electricity after separated in time again
Source, this caused rising waveform have been stablized, and can be used as button fingerprint, and the waveform of now main equipment collection is most stable, compares and misses
Difference is also minimum, and precision can also be higher.
It should be noted that the component and its parameter of above circuit, only the technical program preferred embodiment, this
Technical scheme can also select other components and its parameter；According to public's general knowledge, those skilled in the art,
For the different application scenarios of the technical program, it is not necessary to play creativity, so that it may which component and its parameter are adjusted.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (2)
- A kind of 1. recognizable key circuit, it is characterised in that including：Resistance R69, button K1, control chip U1, the electricity of main equipment Hold C1 and resistance R1, the resistance R69 one end connection control chip U1 power port, the other end of the resistance R69 connects Button K1 one end is connect, the other end connection electric capacity C1 of the button K1 one end, resistance R1 one end, the electric capacity C1's is another One end, the resistance R1 other end are grounded, and one end of the button K1 is also connected with control chip U1 detection port；Wherein, waveform is produced when the button K1 is pressed, the feature of the waveform is with the resistance R1 and the electric capacity C1 value difference and changes, the control chip U1 according to the feature of the waveform judge the button K1 whether be control institute State the button of the specific function of main equipment；After the button K1 is pressed, button K1 power supplys are closed by control chip U1, opens and presses again after the scheduled time of interval Key K1 power supplys, to obtain waveform stable caused by button K1.
- 2. a kind of recognizable key circuit according to claim 1, it is characterised in that the resistance of the resistance R69 is 1K Ω, the electric capacity C1 capacitance are 100nF, and the resistance of the resistance R1 is 200 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410350915.5A CN104124952B (en) | 2014-07-22 | 2014-07-22 | A kind of recognizable key circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410350915.5A CN104124952B (en) | 2014-07-22 | 2014-07-22 | A kind of recognizable key circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104124952A CN104124952A (en) | 2014-10-29 |
| CN104124952B true CN104124952B (en) | 2018-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410350915.5A Active CN104124952B (en) | 2014-07-22 | 2014-07-22 | A kind of recognizable key circuit |
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| Country | Link |
|---|---|
| CN (1) | CN104124952B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9698777B1 (en) * | 2016-05-23 | 2017-07-04 | Nuvoton Technology Corporation | Secured keyboard readout using capacitance matrix |
| CN109523765A (en) * | 2017-09-20 | 2019-03-26 | 富泰华工业（深圳）有限公司 | Remote controler |
| CN109038709B (en) * | 2018-07-12 | 2021-08-24 | 深圳拓邦股份有限公司 | Key identification circuit and method and stirrer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201788385U (en) * | 2010-09-17 | 2011-04-06 | 美的集团有限公司 | Key control circuit of microwave oven |
| CN203180871U (en) * | 2013-03-27 | 2013-09-04 | 潍坊歌尔电子有限公司 | Bluetooth earphone reset circuit |
| CN203217471U (en) * | 2013-03-14 | 2013-09-25 | 厦门歌乐电子企业有限公司 | Electronic device and vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2120338A1 (en) * | 2008-05-15 | 2009-11-18 | Thomson Licensing | Key press detecting circuit |
-
2014
- 2014-07-22 CN CN201410350915.5A patent/CN104124952B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201788385U (en) * | 2010-09-17 | 2011-04-06 | 美的集团有限公司 | Key control circuit of microwave oven |
| CN203217471U (en) * | 2013-03-14 | 2013-09-25 | 厦门歌乐电子企业有限公司 | Electronic device and vehicle |
| CN203180871U (en) * | 2013-03-27 | 2013-09-04 | 潍坊歌尔电子有限公司 | Bluetooth earphone reset circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104124952A (en) | 2014-10-29 |
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