CN102624372A - Touch key circuit - Google Patents
Touch key circuit Download PDFInfo
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- CN102624372A CN102624372A CN2011100337115A CN201110033711A CN102624372A CN 102624372 A CN102624372 A CN 102624372A CN 2011100337115 A CN2011100337115 A CN 2011100337115A CN 201110033711 A CN201110033711 A CN 201110033711A CN 102624372 A CN102624372 A CN 102624372A
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Abstract
Disclosed in the invention is a touch key circuit, comprising wiring terminals, a multi-channel touch key control chip and multipath key circuits. Each of the key circuits respectively comprises: a key, which is connected with an input end of the multi-channel touch key control chip; a triode, whose base electrode is connected with an output end corresponding to the input end; and a diode. Specifically, an input end of the diode is connected with an emitter of the triode and an output end of the diode is connected with a key port of one of the wiring terminals. The output end of the multi-channel touch key control chip is connected with a power source by pull-up resistor and a collector of the triode is grounded. According to the disclosed touch key circuit, the multi-channel touch key control chip is employed and detection on a key state by a main program control chip through the wiring terminals is realized by connection and disconnection of the triodes and diodes, thereby further realizing an objective of control on multiple keys, simplifying the circuit structure, reducing the number and cost of devices. Moreover, when it is needed to support the multiple keys, extension can be carried out conveniently, so that extensibility is improved and complexity of the extension is reduced.
Description
Technical field
The present invention relates to the mobile communication equipment field, relate in particular to a kind of touch key-press circuit.
Background technology
Existing touch key-press circuit structure is as shown in Figure 1, comprising: connect the binding post 11 of mainboard control chip, said binding post comprises seven ports; Divider resistance 12, said divider resistance are divided into three groups, and every group comprises two resistance that are connected in parallel; Touch key-press control chip 13 comprises six touch key-press control chips altogether among Fig. 1, filter capacitor 14 and the diode 15 that links to each other with each touch key-press control chip.
Can find out that by figure existing touch key-press circuit adopts and touches IC (integrated circuit, surface-mounted integrated circuit) the single channel way of output, both the corresponding paths output of touch key-press control chip.When the button of supporting when needs was a lot, the structure of circuit will be very complicated, and cost is also higher.
Summary of the invention
In view of this, the present invention provides a kind of touch key-press circuit.Its concrete scheme is following:
A kind of touch key-press circuit comprises: binding post, multichannel touch key-press control chip and multichannel key circuit, and wherein, the number of channels of said multichannel touch key-press control chip is more than or equal to the quantity of said touch key-press circuit;
Wherein, Every road key circuit comprises respectively: the button that links to each other with the input of said multichannel touch key-press control chip; The triode that the base stage output corresponding with said input links to each other; The diode that input links to each other with the emitter-base bandgap grading of said triode, the output of said diode links to each other with the button port of binding post; Said multichannel touch key-press control chip output links to each other with power supply through pull-up resistor; Said transistor collector ground connection;
When said button is not pressed, said output output high level, said triode ends, said diode current flow, said button port detects high level;
When said button is pressed, said output output low level, said triode conducting, said diode ends, and said button port detects low level.
Preferably, also comprise: with the filtration module that said multichannel touch key-press control chip power input links to each other, said filtration module comprises: filter capacitor.
Preferably, said filtration module also comprises: the magnetic bead parallelly connected with said filter capacitor.
Preferably, said key circuit also comprises: the divider resistance that an end links to each other with said diode input, the other end of said divider resistance links to each other with said binding post.
Preferably, also comprise protocol interface, said protocol interface links to each other with said multichannel touch key-press control chip, is used to read the value of register in the said multichannel touch key-press control chip.
Preferably, also comprise with said binding post on button confirm the drop-down module that port links to each other, said drop-down module comprises pull down resistor, drop-down electric capacity or the pull down resistor that is connected in parallel or drop-down electric capacity.
Preferably, but said binding post link to each other with display panel with programming program.
This shows that touch key-press circuit disclosed by the invention adopts multichannel touch key-press control chip, and realize that through the break-make of triode and diode the main program control chip detects key-press status through binding post; And then the purpose of a plurality of buttons of realization control, simplified circuit structure, reduced the quantity and the cost of device; When needs are supported a plurality of button; Can expand easily, improve extensibility, reduce the complexity of expansion.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of touch key-press circuit of the prior art;
Fig. 2 is the structural representation of the disclosed touch key-press circuit of the embodiment of the invention;
Fig. 3 is the syndeton sketch map of disclosed binding post of the embodiment of the invention and key circuit.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The invention discloses a kind of touch key-press circuit; Its structure is as shown in Figure 2; Comprise: binding post 21, multichannel touch key-press control chip 22, multichannel key circuit 23, wherein, the number of channels of said multichannel touch key-press control chip 22 is more than or equal to the quantity of said touch key-press circuit; Can find out that by Fig. 2 the touch key-press circuit in the present embodiment comprises 6 road key circuits.
Wherein, Every road key circuit comprises respectively: the button 231 that links to each other with the input of said multichannel touch key-press control chip 22; The triode 232 that the base stage output corresponding with said input links to each other; The diode 233 that input links to each other with the emitter-base bandgap grading of said triode 232, the output of said diode 233 links to each other with the button port of binding post 21; The output of said multichannel touch key-press control chip 22 links to each other with power supply through pull-up resistor 234; The grounded collector of said triode 232.
With the 1 road key circuit is example; Comprise button KEY_1; KEY_1 links to each other with the input CS1 of multichannel touch key-press control chip; Link to each other with the base stage of triode Q1 through the first output S1 then, the emitter of Q1 links to each other with diode D1 input, and the output of diode D1 links to each other with the keystroke interface of binding post.The structure of other road key circuits is identical with the 1 road key circuit.
Present embodiment adopts the control mode of dynamic scan, is example with the 1 road key circuit, when KEY_1 is not pressed; Passage touch key-press control chip output output high level; Said triode Q1 ends, said diode D1 conducting, and KEY1 detects high level; If KEY_1 presses, then the first output port output level on the multichannel touch key-press control chip is low, triode Q1 conducting this moment; Other not conductings of triode, not conducting of diode D1, other diode current flows; KEY1 detects significant level-low level; Data scanning port GRID5 confirms that the button in the 1st or the 2 road key circuit is pressed, and differentiates the result for two and combines, and determines KEY_1 and is pressed.
But the binding post 21 in the present embodiment links to each other with the display panel of the control chip with programming program, and the master control chip is realized key-press status is detected through binding post, and then realizes the purpose of a plurality of buttons of control.
Present embodiment does not limit above-mentioned connected mode, so long as can realize each road key circuit is detected, realizes confirming that the annexation of button purpose all is the scope of present embodiment protection.
Further; The touch key-press circuit also comprises: with the filtration module 24 that the power input of said multichannel touch key-press control chip 22 links to each other, said filtration module 24 comprises: filter capacitor 241, and the interchange that is used for the filtering communication process is disturbed; Further; Filtration module 24 also comprises the magnetic bead 242 parallelly connected with filter capacitor 241, improves electromagnetic interference to play, and optimizes the effect of circuit performance.
Except that said structure, as shown in Figure 2, the key circuit in the touch key-press circuit disclosed by the invention further comprises: divider resistance 235, and an end of divider resistance links to each other with said diode input, and the other end links to each other with binding post.Divider resistance 235 also plays metering function to key circuit except realizing dividing potential drop, be unlikely to overload with the electric current of the work that guarantees diode and triode, causes damage, influences the operate as normal of circuit.
The disclosed touch key-press circuit of present embodiment also comprises: drop-down module 25; Drop-down module in the present embodiment comprises: the pull down resistor 251 and the drop-down electric capacity 252 that are connected in parallel; To eliminate the interference in the key circuit; And guarantee that button affirmation port KEY1 and the detected level of KEY2 have only two states high or low, have guaranteed the accuracy of testing process.
Present embodiment does not limit drop-down module must comprise pull down resistor and drop-down electric capacity simultaneously, can also be independent comprise pull down resistor or drop-down electric capacity.
Further, the disclosed touch key-press circuit of present embodiment also comprises protocol interface 26, and the binding post through one 4 pin links to each other with multichannel touch key-press control chip 22, is used to read the value of registers in the multichannel touch key-press control chip 22.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (7)
1. a touch key-press circuit is characterized in that, comprising: binding post, multichannel touch key-press control chip and multichannel key circuit, and wherein, the number of channels of said multichannel touch key-press control chip is more than or equal to the quantity of said touch key-press circuit;
Wherein, Every road key circuit comprises respectively: the button that links to each other with the input of said multichannel touch key-press control chip; The triode that the base stage output corresponding with said input links to each other; The diode that input links to each other with the emitter-base bandgap grading of said triode, the output of said diode links to each other with the button port of binding post; Said multichannel touch key-press control chip output links to each other with power supply through pull-up resistor; Said transistor collector ground connection;
When said button is not pressed, said output output high level, said triode ends, said diode current flow, said button port detects high level;
When said button is pressed, said output output low level, said triode conducting, said diode ends, and said button port detects low level.
2. circuit according to claim 1 is characterized in that, also comprises: with the filtration module that said multichannel touch key-press control chip power input links to each other, said filtration module comprises: filter capacitor.
3. circuit according to claim 2 is characterized in that, said filtration module also comprises: the magnetic bead parallelly connected with said filter capacitor.
4. circuit according to claim 3 is characterized in that, said key circuit also comprises: the divider resistance that an end links to each other with said diode input, the other end of said divider resistance links to each other with said binding post.
5. circuit according to claim 4 is characterized in that, also comprises protocol interface, and said protocol interface links to each other with said multichannel touch key-press control chip, is used to read the value of register in the said multichannel touch key-press control chip.
6. circuit according to claim 5 is characterized in that, also comprise with said binding post on button confirm the drop-down module that port links to each other, said drop-down module comprises pull down resistor, drop-down electric capacity or the pull down resistor that is connected in parallel or drop-down electric capacity.
7. circuit according to claim 6 is characterized in that, but said binding post links to each other with the display panel with programming program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110033711.5A CN102624372B (en) | 2011-01-31 | 2011-01-31 | Touch key circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110033711.5A CN102624372B (en) | 2011-01-31 | 2011-01-31 | Touch key circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN102624372A true CN102624372A (en) | 2012-08-01 |
| CN102624372B CN102624372B (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110033711.5A Active CN102624372B (en) | 2011-01-31 | 2011-01-31 | Touch key circuit |
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| CN (1) | CN102624372B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633983A (en) * | 2013-12-09 | 2014-03-12 | 宁波翼动通讯科技有限公司 | Key extension circuit |
| CN104080234A (en) * | 2013-03-28 | 2014-10-01 | 林万炯 | Touching and keying integrated LED driver |
| CN108809290A (en) * | 2018-08-08 | 2018-11-13 | 中山市悦辰电子实业有限公司 | A kind of anti-impulse disturbances circuit of touch key-press |
| CN109407911A (en) * | 2018-12-20 | 2019-03-01 | 广州庆源电子有限公司 | Function of movable air conditioner display panel with touch function |
| CN111530067A (en) * | 2020-04-02 | 2020-08-14 | 努比亚技术有限公司 | Method for controlling game by multiple keys, mobile terminal and computer readable storage medium |
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| CN101079911A (en) * | 2006-05-26 | 2007-11-28 | 三星电子株式会社 | Mobile phone having decoration cover used as key input means |
| US20070291006A1 (en) * | 2006-06-16 | 2007-12-20 | Samsung Electronics Co., Ltd. | User interface apparatus and method |
| US20080011596A1 (en) * | 2006-07-14 | 2008-01-17 | Samsung Electronics Co.; Ltd | Keypad and keypad assembly |
| CN201230347Y (en) * | 2008-06-27 | 2009-04-29 | 天津三星电子有限公司 | Digital video camera with iris recognition system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079911A (en) * | 2006-05-26 | 2007-11-28 | 三星电子株式会社 | Mobile phone having decoration cover used as key input means |
| US20070291006A1 (en) * | 2006-06-16 | 2007-12-20 | Samsung Electronics Co., Ltd. | User interface apparatus and method |
| US20080011596A1 (en) * | 2006-07-14 | 2008-01-17 | Samsung Electronics Co.; Ltd | Keypad and keypad assembly |
| CN201230347Y (en) * | 2008-06-27 | 2009-04-29 | 天津三星电子有限公司 | Digital video camera with iris recognition system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104080234A (en) * | 2013-03-28 | 2014-10-01 | 林万炯 | Touching and keying integrated LED driver |
| CN104080234B (en) * | 2013-03-28 | 2016-08-17 | 赛尔富电子有限公司 | A kind of touch key-press integral LED driver |
| CN103633983A (en) * | 2013-12-09 | 2014-03-12 | 宁波翼动通讯科技有限公司 | Key extension circuit |
| CN108809290A (en) * | 2018-08-08 | 2018-11-13 | 中山市悦辰电子实业有限公司 | A kind of anti-impulse disturbances circuit of touch key-press |
| CN109407911A (en) * | 2018-12-20 | 2019-03-01 | 广州庆源电子有限公司 | Function of movable air conditioner display panel with touch function |
| CN111530067A (en) * | 2020-04-02 | 2020-08-14 | 努比亚技术有限公司 | Method for controlling game by multiple keys, mobile terminal and computer readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102624372B (en) | 2014-06-18 |
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