CN102624372B - Touch key circuit - Google Patents
Touch key circuit Download PDFInfo
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- CN102624372B CN102624372B CN201110033711.5A CN201110033711A CN102624372B CN 102624372 B CN102624372 B CN 102624372B CN 201110033711 A CN201110033711 A CN 201110033711A CN 102624372 B CN102624372 B CN 102624372B
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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 mobile communication equipment field, relate in particular to a kind of touch key-press circuit.
Background technology
Existing touch key-press circuit structure as shown in Figure 1, comprising: connect the binding post 11 of mainboard control chip, described binding post comprises seven ports; Divider resistance 12, described divider resistance is 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 in Fig. 1, filter capacitor 14 and the diode 15 being connected with each touch key-press control chip.
As seen from the 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 a-road-through of a touch key-press control chip road output.The button of supporting when needs is when a lot of, and the structure of circuit will be very complicated, and cost is also higher.
Summary of the invention
In view of this, the invention provides a kind of touch key-press circuit.Its concrete scheme is as follows:
A kind of touch key-press circuit, comprising: binding post, multichannel touch key-press control chip and multichannel key circuit, and wherein, the number of channels of described multichannel touch key-press control chip is more than or equal to the quantity of described touch key-press circuit;
Wherein, every road key circuit comprises respectively: the button being connected with the input of described multichannel touch key-press control chip, the connected triode of output that base stage is corresponding with described input, the diode that input is connected with the emitter-base bandgap grading of described triode, the output of described diode is connected with the button port of binding post; Described multichannel touch key-press control chip output is connected with power supply by pull-up resistor; Described transistor collector ground connection;
In the time that described button is not pressed, described output output high level, described triode cut-off, described diode current flow, described button Port detecting is to high level;
In the time that described button is pressed, described output output low level, described triode conducting, described diode cut-off, described button Port detecting is to low level.
Preferably, also comprise: with the filtration module that described multichannel touch key-press control chip power input is connected, described filtration module comprises: filter capacitor.
Preferably, described filtration module also comprises: the magnetic bead in parallel with described filter capacitor.
Preferably, described key circuit also comprises: the divider resistance that one end is connected with described diode input, the other end of described divider resistance is connected with described binding post.
Preferably, also comprise protocol interface, described protocol interface is connected with described multichannel touch key-press control chip, for reading the value of register in described multichannel touch key-press control chip.
Preferably, also comprise with button on described binding post and confirm the drop-down module that port is connected, described drop-down module comprises pull down resistor, drop-down electric capacity or the pull down resistor being connected in parallel or drop-down electric capacity.
Preferably, described binding post with have can programming program display panel be connected.
This shows, touch key-press circuit disclosed by the invention adopts multichannel touch key-press control chip, and realize main program control chip by the break-make of triode and diode and by binding post, key-press status is detected, and then realize the object of controlling multiple buttons, and simplify circuit structure, reduce quantity and the cost of device, in the time that needs are supported multiple button, can expand easily, improve extensibility, reduce the complexity of expansion.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 present invention;
Fig. 3 is the syndeton schematic diagram of the disclosed binding post of the embodiment of the present invention and key circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The invention discloses a kind of touch key-press circuit, its structure 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 described multichannel touch key-press control chip 22 is more than or equal to the quantity of described touch key-press circuit, as seen from Figure 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 being connected with the input of described multichannel touch key-press control chip 22, the connected triode 232 of output that base stage is corresponding with described input, the diode 233 that input is connected with the emitter-base bandgap grading of described triode 232, the output of described diode 233 is connected with the button port of binding post 21; The output of described multichannel touch key-press control chip 22 is connected with power supply by pull-up resistor 234; The grounded collector of described triode 232.
Taking the 1st road key circuit as example, comprise button KEY_1, KEY_1 is connected with the input CS1 of multichannel touch key-press control chip, then be connected with the base stage of triode Q1 by the first output S1, the emitter of Q1 is connected with diode D1 input, and the output of diode D1 is connected with the keystroke interface of binding post.The structure of other road key circuits is identical with the 1st road key circuit.
The structural representation that binding post 21 is connected with 6 road key circuits as shown in Figure 3, as seen from the figure,
The present embodiment adopts the control mode of dynamic scan, taking the 1st road key circuit as example, in the time that KEY_1 is not pressed, passage touch key-press control chip output output high level, described triode Q1 cut-off, described diode D1 conducting, KEY1 detects high level; If KEY_1 presses, the first output port output level on multichannel touch key-press control chip is low, now triode Q1 conducting, other not conductings of triode, not conducting of diode D1, other diode current flows, KEY1 detects significant level-low level, data scanning port GRID5 determines it is that button in the 1st or the 2nd road key circuit is pressed, and differentiates result combination, determines KEY_1 and be pressed for two.
Binding post 21 in the present embodiment is connected with the display panel with control chip that can programming program, and Master control chip is realized key-press status is detected by binding post, and then realizes the object of controlling multiple buttons.
The present embodiment does not limit above-mentioned connected mode, detects as long as realizing Dui Ge road key circuit, realizes and determines that the annexation of button object is all the scope of the present embodiment protection.
Further, touch key-press circuit also comprises: the filtration module 24 being connected with the power input of described multichannel touch key-press control chip 22, described filtration module 24 comprises: filter capacitor 241, interchange for filtering communication process is disturbed, further, filtration module 24 also comprises the magnetic bead in parallel with filter capacitor 241 242, improves electromagnetic interference, the effect of optimized circuit performance to play.
Except said structure, as shown in Figure 2, the key circuit in touch key-press circuit disclosed by the invention further comprises: divider resistance 235, and one end of divider resistance is connected with described diode input, and the other end is connected with binding post.Divider resistance 235, except realizing dividing potential drop, also plays metering function to key circuit, is unlikely to overload with the electric current of the work that ensures diode and triode, causes damage, affects the normal work of circuit.
The disclosed touch key-press circuit of the present embodiment also comprises: drop-down module 25, drop-down module in the present embodiment comprises: the pull down resistor 251 being connected in parallel and drop-down electric capacity 252, to eliminate the interference in key circuit, and guarantee that the level that button confirms that port KEY1 and KEY2 detect only has two states high or low, has ensured the accuracy of testing process.
The 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 the present embodiment also comprises protocol interface 26, is connected, for reading the value of multichannel touch key-press control chip 22 interior registers by the binding post of 4 pins with multichannel touch key-press control chip 22.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates referring to method part.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
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 described multichannel touch key-press control chip is more than or equal to the quantity of described touch key-press circuit;
Wherein, every road key circuit comprises respectively: the button being connected with the input of described multichannel touch key-press control chip, the connected triode of output that base stage is corresponding with described input, the diode that input is connected with the emitter-base bandgap grading of described triode, the output of described diode is connected with the button port of binding post; Described multichannel touch key-press control chip output is connected with power supply by pull-up resistor; Described transistor collector ground connection; The divider resistance that one end is connected with described diode input, the other end of described divider resistance is connected with described binding post;
In the time that described button is not pressed, described output output high level, described triode cut-off, described diode current flow, described button Port detecting is to high level;
In the time that described button is pressed, described output output low level, described triode conducting, described diode cut-off, described button Port detecting is to low level.
2. circuit according to claim 1, is characterized in that, also comprises: with the filtration module that described multichannel touch key-press control chip power input is connected, described filtration module comprises: filter capacitor.
3. circuit according to claim 2, is characterized in that, described filtration module also comprises: the magnetic bead in parallel with described filter capacitor.
4. circuit according to claim 3, is characterized in that, also comprises protocol interface, and described protocol interface is connected with described multichannel touch key-press control chip, for reading the value of register in described multichannel touch key-press control chip.
5. circuit according to claim 4, is characterized in that, also comprises with button on described binding post and confirms the drop-down module that port is connected, and described drop-down module comprises pull down resistor, drop-down electric capacity or the pull down resistor being connected in parallel and drop-down electric capacity.
6. circuit according to claim 5, is characterized in that, described binding post with have can programming program display panel be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110033711.5A CN102624372B (en) | 2011-01-31 | 2011-01-31 | Touch key circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110033711.5A CN102624372B (en) | 2011-01-31 | 2011-01-31 | Touch key circuit |
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| Publication Number | Publication Date |
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| CN102624372A CN102624372A (en) | 2012-08-01 |
| CN102624372B true CN102624372B (en) | 2014-06-18 |
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| CN201110033711.5A Active CN102624372B (en) | 2011-01-31 | 2011-01-31 | Touch key circuit |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (2)
| 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 |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070119946A (en) * | 2006-06-16 | 2007-12-21 | 삼성전자주식회사 | Apparatus and method for user interface |
| KR100827090B1 (en) * | 2006-07-14 | 2008-05-02 | 삼성전자주식회사 | Key pad and key pad assembly |
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2011
- 2011-01-31 CN CN201110033711.5A patent/CN102624372B/en active Active
Patent Citations (2)
| 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 |
| 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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| CN102624372A (en) | 2012-08-01 |
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