CN103078648A - Key collection circuit - Google Patents
Key collection circuit Download PDFInfo
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- CN103078648A CN103078648A CN2012105746334A CN201210574633A CN103078648A CN 103078648 A CN103078648 A CN 103078648A CN 2012105746334 A CN2012105746334 A CN 2012105746334A CN 201210574633 A CN201210574633 A CN 201210574633A CN 103078648 A CN103078648 A CN 103078648A
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- button
- key
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- branch
- control chip
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Abstract
The invention provides a key collection circuit, which comprises a plurality of key branches which are mutually connected in parallel, a public resistor and a control chip, wherein each key branch comprises a key and a branch resistor; a user opens and closes the key to realize functional selection; the resistance values of the branch resistors of different key branches are different, and each branch resistor is connected with the related key in series; the public resistor is connected with the key branches for series connecting allotting; and the control chip collects electric potential between the public resistor and the key branches, judges the type of the key according to the collected electric potential, and executes the corresponding functions of the keys. The key collection circuit has the advantages of low cost and good flexibility.
Description
Technical field
The present invention relates to the control switch field, be specifically related to a kind of button Acquisition Circuit.
Background technology
In the household electrical appliance such as refrigerator, usually have a plurality of buttons on the control panel, after the user presses case, can realize corresponding keypress function.Modal button acquisition method as shown in Figure 1, a plurality of buttons are respectively SW1, SW2, SW3 ... they link to each other with a pin of control chip respectively separately.Control chip ceaselessly gathers the state of all buttons always.Under normal circumstances, chip collects does not have button to be pressed, and does not just carry out corresponding control.If certain button is pressed, can be collected by chip at once, then judge it is which button is pressed, just carry out the function of respective keys.In the method, each button will take a chip pin, and along with the development of the household electrical appliance such as refrigerator, function is more and more, and button is also more and more, need to adopt the chip with a lot of pins, and the multi-pipe pin chip cost is higher.In addition, when button need to reset, the change on the control chip was comparatively complicated, is equivalent to redesign, was difficult for changing.
Summary of the invention
The present invention one of is intended to solve the problems of the technologies described above at least to a certain extent or provides at least a kind of useful commerce to select.For this reason, one object of the present invention be to propose that a kind of cost is lower, flexibility button Acquisition Circuit preferably.
Button Acquisition Circuit according to the embodiment of the invention comprises: many button branch roads, and described many button branch roads are parallel with one another, and wherein, every button branch road comprises: a button, the user selects with practical function by opening and closing described button; With a branch road resistance, the resistance of the described branch road resistance of different key branch road is different, and wherein, described branch road resistance is connected with described button, common resistance, and described common resistance links to each other so that the dividing potential drop of connecting with described many button branch roads; And control chip, described control chip gathers the electromotive force between described common resistance and described many button branch roads, and judges push-button type according to the described electromotive force that collects, and carries out function corresponding to this button.
Button Acquisition Circuit of the present invention has made up the mapping relations of push-button type and collection point electromotive force, thereby has realized keypress function control.The present invention has following advantage at least: on the one hand, a plurality of buttons only take a pin of control chip, have saved the cost of control chip, and the quantity of button can increase to tens even up to a hundred, and cost is lower.On the other hand, when design alteration, only need set up a button and corresponding series resistance thereof, need not chip is significantly changed, flexibility is good.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the schematic diagram of the button Acquisition Circuit of prior art
Fig. 2 is the schematic diagram of the button Acquisition Circuit of the embodiment of the invention
Fig. 3 is the schematic diagram that the button Acquisition Circuit of pull down resistor mode is used in the employing of the embodiment of the invention
Fig. 4 is the schematic diagram that the button Acquisition Circuit of pull-up resistor mode is used in the employing of the embodiment of the invention
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center "; " vertically "; " laterally "; " length "; " width "; " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of indications such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only be for convenience of description the present invention and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the invention, the implication of " a plurality of " is two or more, unless clear and definite concrete restriction is arranged in addition.
In the present invention, unless clear and definite regulation and restriction are arranged in addition, broad understanding should be done in the terms such as term " installation ", " linking to each other ", " connection ", " fixing ", for example, can be to be fixedly connected with, and also can be to removably connect, or connect integratedly; Can be mechanical connection, also can be to be electrically connected; Can be directly to link to each other, also can indirectly link to each other by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand as the case may be above-mentioned term concrete meaning in the present invention.
In the present invention, unless clear and definite regulation and restriction are arranged in addition, First Characteristic Second Characteristic it " on " or D score can comprise that the first and second features directly contact, can comprise that also the first and second features are not directly contacts but by the other feature contact between them.And, First Characteristic Second Characteristic " on ", " top " and " above " comprise First Characteristic directly over Second Characteristic and oblique upper, or only represent that the First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " comprise First Characteristic under the Second Characteristic and tiltedly, or only represent that the First Characteristic level height is less than Second Characteristic.
Fig. 2 is the schematic diagram of the button Acquisition Circuit of the embodiment of the invention.
As shown in Figure 2, button Acquisition Circuit of the present invention comprises: many button branch roads, and many button branch roads are parallel with one another, and wherein, every button branch road comprises: a button, the user selects with practical function by on-off keying; With a branch road resistance, the resistance of the branch road resistance of different key branch road is different, and wherein, branch road resistance is connected with button, common resistance, and common resistance links to each other so that the dividing potential drop of connecting with many button branch roads; And control chip, control chip gathers the electromotive force between common resistance and many button branch roads, and judges push-button type according to the electromotive force that collects, and carries out function corresponding to this button.
Button Acquisition Circuit of the present invention has made up the mapping relations of push-button type and collection point electromotive force, thereby has realized keypress function control.The present invention has following advantage at least: on the one hand, a plurality of buttons only take a pin of control chip, have saved the cost of control chip, and the quantity of button can increase to tens even up to a hundred, and cost is lower.On the other hand, when design alteration, only need set up a button and corresponding series resistance thereof, need not chip is significantly changed, flexibility is good.
For making those skilled in the art understand better the present invention, now do further introduction in conjunction with Fig. 3 and Fig. 4.
As shown in Figure 3, the button Acquisition Circuit according to the embodiment of the invention comprises: a plurality of button SW1, SW2, SW3 ..., the user selects to realize difference in functionality by a plurality of buttons, and a plurality of buttons all link to each other with high level VCC; A plurality of branch road resistance R 1, R2, R3 ..., the resistance of a plurality of branch road resistance is different, a plurality of branch road resistance R 1, R2, R3 ... with a plurality of button SW1, SW2, SW3 ... be compiled in acquisition node A after the series connection correspondingly; Common resistance R0, this acquisition node A is through common resistance R0 ground connection; And control chip 10, a pin of this control chip 10 links to each other with acquisition node A, detecting the electromotive force of this acquisition node A, and judges push-button type according to the electromotive force of acquisition node A, and carries out function corresponding to this button.Particularly, suppose to supress X button SWX, the then branch road conducting at this button place, the electromotive force that this moment, control chip 10 collected at acquisition node A is R0*VCC/ (RX+R0), the corresponding informance of pre-stored electromotive force size and push-button type in the control chip, can inquire easily correspondingly to key class, control chip is carried out corresponding control function subsequently.
As shown in Figure 4, the button Acquisition Circuit according to the embodiment of the invention comprises: a plurality of button SW1, SW2, SW3 ..., the user selects to realize difference in functionality by a plurality of buttons, the equal and ground connection of a plurality of buttons; A plurality of branch road resistance R 1, R2, R3 ..., the resistance of a plurality of branch road resistance is different, a plurality of branch road resistance R 1, R2, R3 ... with a plurality of button SW1, SW2, SW3 ... be compiled in acquisition node A after the series connection correspondingly; Common resistance R0, this acquisition node A meets high level VCC through common resistance R0; And control chip 10, a pin of this control chip 10 links to each other with acquisition node A, detecting the electromotive force of this acquisition node A, and judges push-button type according to the electromotive force of acquisition node A, and carries out function corresponding to this button.Particularly, suppose to supress X button SWX, the then branch road conducting at this button place, the electromotive force that this moment, control chip 10 collected at acquisition node A is RX*VCC/ (RX+R0), the corresponding informance of pre-stored electromotive force size and push-button type in the control chip, can inquire easily correspondingly to key class, control chip is carried out corresponding control function subsequently.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or the example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although the above has illustrated and has described embodiments of the invention, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment in the situation that does not break away from principle of the present invention and aim within the scope of the invention, modification, replacement and modification.
Claims (3)
1. a button Acquisition Circuit is characterized in that, comprising:
Many button branch roads, described many button branch roads are parallel with one another, and wherein, every button branch road comprises:
A button, the user selects with practical function by opening and closing described button; With a branch road resistance, the resistance of the described branch road resistance of different key branch road is different, and wherein, described branch road resistance is connected with described button,
Common resistance, described common resistance links to each other so that the dividing potential drop of connecting with described many button branch roads; And
Control chip, described control chip gather the electromotive force between described common resistance and described many button branch roads, and judge push-button type according to the described electromotive force that collects, and carry out function corresponding to this button.
2. button Acquisition Circuit as claimed in claim 1 is characterized in that, a termination high level of described common resistance, described many button branch roads of another termination; The described common resistance of one termination of described many button branch roads, other end ground connection.
3. button Acquisition Circuit as claimed in claim 1 is characterized in that, an end ground connection of described common resistance, described many button branch roads of another termination; The described common resistance of one termination of described many button branch roads, another termination high level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105746334A CN103078648A (en) | 2012-12-26 | 2012-12-26 | Key collection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105746334A CN103078648A (en) | 2012-12-26 | 2012-12-26 | Key collection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103078648A true CN103078648A (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105746334A Pending CN103078648A (en) | 2012-12-26 | 2012-12-26 | Key collection circuit |
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| CN (1) | CN103078648A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337602A (en) * | 2015-11-17 | 2016-02-17 | 深圳市汇春科技股份有限公司 | Circuit and method for achieving two keys on single PAD |
| CN105978576A (en) * | 2016-05-06 | 2016-09-28 | 京东方科技集团股份有限公司 | Key circuit and using method thereof, TV key panel, display device |
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| US5619196A (en) * | 1995-12-28 | 1997-04-08 | Universal Electronics Inc. | Single wire keyboard encode and decode circuit |
| CN1952853A (en) * | 2005-10-18 | 2007-04-25 | 普诚科技股份有限公司 | Key apparatus and detecting method thereof |
| CN101359034A (en) * | 2007-07-31 | 2009-02-04 | 华矽半导体股份有限公司 | Keyboard detection circuit and method thereof |
| JP2009122798A (en) * | 2007-11-13 | 2009-06-04 | Panasonic Corp | Switch input recognition device |
| CN102147448A (en) * | 2010-02-09 | 2011-08-10 | 联咏科技股份有限公司 | Keying operation detecting system and method |
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2012
- 2012-12-26 CN CN2012105746334A patent/CN103078648A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5619196A (en) * | 1995-12-28 | 1997-04-08 | Universal Electronics Inc. | Single wire keyboard encode and decode circuit |
| CN1952853A (en) * | 2005-10-18 | 2007-04-25 | 普诚科技股份有限公司 | Key apparatus and detecting method thereof |
| CN101359034A (en) * | 2007-07-31 | 2009-02-04 | 华矽半导体股份有限公司 | Keyboard detection circuit and method thereof |
| JP2009122798A (en) * | 2007-11-13 | 2009-06-04 | Panasonic Corp | Switch input recognition device |
| CN102147448A (en) * | 2010-02-09 | 2011-08-10 | 联咏科技股份有限公司 | Keying operation detecting system and method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337602A (en) * | 2015-11-17 | 2016-02-17 | 深圳市汇春科技股份有限公司 | Circuit and method for achieving two keys on single PAD |
| CN105337602B (en) * | 2015-11-17 | 2018-09-11 | 深圳市汇春科技股份有限公司 | A kind of list PAD realizes the circuit and method of two buttons |
| CN105978576A (en) * | 2016-05-06 | 2016-09-28 | 京东方科技集团股份有限公司 | Key circuit and using method thereof, TV key panel, display device |
| CN105978576B (en) * | 2016-05-06 | 2019-04-12 | 京东方科技集团股份有限公司 | Key circuit and its application method, television key plate, display device |
| US10447299B2 (en) | 2016-05-06 | 2019-10-15 | Boe Technology Group Co., Ltd. | Press-button circuit and driving method thereof, keypad, and display device |
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| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 230601 Hefei Changjiang Road, Anhui, No. 669 Applicant after: Hefei Midea Refrigerator Co., Ltd. Address before: 230601 Hefei Changjiang Road, Anhui, No. 669 Applicant before: Hefei Media Rongshida Refrigerator Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: HEFEI MEDIA RONGSHIDA REFRIGERATOR CO., LTD. TO: HEFEI MIDEA REFRIGERATORCO., LTD. |
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Application publication date: 20130501 |