CN110995276A - Three-line key scanning method for T-type scanning key expansion - Google Patents
Three-line key scanning method for T-type scanning key expansion Download PDFInfo
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- CN110995276A CN110995276A CN201910366515.6A CN201910366515A CN110995276A CN 110995276 A CN110995276 A CN 110995276A CN 201910366515 A CN201910366515 A CN 201910366515A CN 110995276 A CN110995276 A CN 110995276A
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- 238000013461 design Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 10
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- 238000004806 packaging method and process Methods 0.000 description 2
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
- H03M11/20—Dynamic coding, i.e. by key scanning
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Abstract
The invention relates to the technical field of remote controllers, in particular to a three-line key scanning method for T-type scanning key expansion, which comprises the following steps: the method comprises the following steps: under the condition that the original T scanning structure of the traditional remote controller can not be changed, a key for scanning three lines is added to form a three-line key scanning mode; step two: in the three-wire key scanning mode in the first step, one port is extracted from the port of the original T scanning structure to serve as a public port, whether the port receives a key signal or not is preferentially detected during key scanning, if the key signal is received, the pressed key is considered to be a three-wire key, and then the other input port is detected to receive the key signal, so that which three-wire key is pressed can be determined; if the public port does not detect the port signal, other ports are continuously detected, and whether a key is pressed down is judged; the method has the advantage that the number of keys can be increased to the maximum under the condition of the same pin number.
Description
Technical Field
The invention relates to the technical field of remote controllers, in particular to a three-line key scanning method for T-type scanning key expansion.
Background
The remote controller keyboard scanning is generally divided into two scanning modes: matrix scanning and T-scan. In the same I/O port, the T-type scanning mode can realize more keys than the matrix scanning mode. Generally, in a television or a set top box remote controller, a T-shaped scanning mode is adopted due to the fact that the number of keys is large; in the air conditioner remote controller, the number of keys is less, and a matrix type scanning mode is more. The packaging form of the chip is more than that of SOP16 now, namely the pin number of the chip is 16. In the key design, two ports are combined into one key. The driver brings innovation on the basis of multiple experiments, and whether the function development of multiple keys can be realized under the condition of reducing I/O pins is achieved.
Disclosure of Invention
The present invention is directed to a three-line key scanning method for T-scan key expansion, which overcomes the drawbacks and disadvantages of the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention relates to a three-line key scanning method for T-type scanning key expansion, which comprises the following steps:
the method comprises the following steps: under the condition that the original T scanning structure of the traditional remote controller can not be changed, aiming at the scanning mode of 'two-line key' of the traditional remote controller, a key for scanning three lines is added to form a three-line key scanning mode;
step two: in the three-wire key scanning mode in the first step, one port is extracted from the port of the original T scanning structure to serve as a public port, whether the port receives a key signal or not is preferentially detected during key scanning, if the key signal is received, the pressed key is considered to be a three-wire key, and then the other input port is detected to receive the key signal, so that which three-wire key is pressed can be determined; if the public port does not detect the port signal, other ports are continuously detected, and whether a key is pressed down is judged;
step three: in the three-line key scanning mode in the first step, the design method of the number of keys is as follows:
(1) aiming at n pins, under the condition that the n pins participate in T-type scanning of the traditional remote controller in the step one, n (n-1)/2 keys are realized;
(2) in the three-wire key scanning mode in the second step, one port is used as a public port, namely one pin is used as a public pin, so that the number of the rest pins is n-1, and the rest n-1 pins are subjected to T-type scanning to realize (n-1) (n-2) keys;
(3) and (3) aiming at the number of n (n-1)/2 keys and (n-1) (n-2) keys in the steps (1) and (2), when n is larger than 4, the number of keys obtained by the three-line key scanning mode in the step two is superior to the number of keys formed by the original T scanning mode of the traditional remote controller.
The invention has the beneficial effects that: the three-wire key scanning method for the T-type scanning key expansion adopts a three-wire key mode, and can maximize the number of keys under the condition of the same pin number, thereby facilitating the remote controller to greatly expand the application range of the remote controller according to different electrical appliance requirements.
Drawings
FIG. 1 is a circuit schematic of a conventional T-scan;
FIG. 2 is a schematic diagram of a three line scan non-common terminal portion circuit of the present invention;
FIG. 3 is a schematic diagram of the three line scanning common terminal portion circuit of the present invention;
FIG. 4 is a system connection diagram of the present invention;
FIG. 5 is a logic topology diagram determined by the routine of the present invention;
FIG. 6 is a diagram of the bond wires in the conventional T-scan circuit of the present invention and in the three-line scan non-common terminal portion of the present design;
fig. 7 is a diagram of the on-press wiring connections of the common end portion of the three-line scan of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 5, the three-line key scanning method for T-scan key expansion according to the present invention adopts the following steps:
the method comprises the following steps: under the condition that the original T scanning structure of the traditional remote controller can not be changed, aiming at the scanning mode of 'two-line key' of the traditional remote controller, a key for scanning three lines is added to form a three-line key scanning mode;
step two: in the three-wire key scanning mode in the first step, one port is extracted from the port of the original T scanning structure to be used as a public port, namely one pin is extracted from the pin of the original T scanning structure in the first step to be used as a public pin; when the keys are scanned, whether the port receives the key signal or not is preferentially detected, if the key signal is received, the pressed key can be considered as a three-wire key, and then the other input port is detected to receive the key signal, so that which three-wire key is pressed can be determined; if the public port does not detect the port signal, other ports are continuously detected, and whether a key is pressed down is judged;
step three: in the three-line key scanning mode in the first step, the design method of the number of keys is as follows:
(1) aiming at n pins, under the condition that the n pins participate in T-type scanning of the traditional remote controller in the step one, n (n-1)/2 keys are realized;
(2) in the three-wire key scanning mode in the second step, one port is used as a public port, namely one pin is used as a public pin, so that the number of the rest pins is n-1, and the rest n-1 pins are subjected to T-type scanning to realize (n-1) (n-2) keys;
(3) and (3) aiming at the number of n (n-1)/2 keys and (n-1) (n-2) keys in the steps (1) and (2), when n is larger than 4, the number of the keys obtained by the three-line key scanning mode in the step two is superior to the number of the keys formed by the original T scanning of the traditional remote controller.
The specific embodiment of the invention is as follows:
the sample chosen for this design is an 11-pin chip. As shown in fig. 1, according to the original T-type scanning mode of the conventional remote controller, at most 44 keys can be scanned; the scheme of the number of keys which can be realized in this way cannot meet the requirement of development of a large number of televisions or set top box remote controllers. The design introduces a three-wire key mode, and on the basis of the original two-wire key scheme, the pin 2 of the IC is independently taken out to be used as a public end expansion key;
wherein: FIG. 2 shows a portion where the common terminal is not used, and there are 35 keys;
wherein: the pin 2 shown in fig. 3 is used as a common terminal to be connected with other T-type scanning nodes, and 35 keys are also arranged, so that 70 keys can be developed;
wherein: the key structure of the common terminal part is different from that of the non-common terminal part, and a three-line conducting switch (one extension line is added) is adopted, as shown in the key structure diagram of fig. 3.
The design further explains the three-line scanning mode and the original T-type sub-scanning mode; the description is as follows:
as shown in the system connection diagram of fig. 4. The original T-type scanning pin is a chip pin 3, a chip pin 4 and a key 2, the newly introduced three-line scanning is formed by the key 1, the chip pin 2 serving as a public end, the chip pin 3 and the chip pin 4, compared with the original T-type scanning, the logic of key judgment is adjusted, a judgment whether the chip pin 2 is connected or not needs to be added, and whether the key 1 or the key 2 is connected or not is distinguished by judging whether the pin 2 is connected or not; the program judgment logic is as shown in fig. 5, and the T-scan is performed, the key is detected, whether the terminal is a public terminal is judged, then the table is looked up to locate the key, and finally the key function is realized by emitting red external codes.
FIG. 6 shows the connection diagram of the key lead of the conventional T-scan circuit and the three-line scan non-common terminal of the present design; the two pins of the key 1 are connected with two leads I2. FIG. 7 is a schematic diagram of the wiring connections of the common end portion of the three-line scan of the present invention; a common pin is added on two pins of the key 1, and then the common pin is connected with the expansion line 3 to form a three-line scanning mode, so that three lines are realized to position the key.
The invention has the following advantages:
1. the multiplexing efficiency of the I/O port of the IC is improved;
2. more keys can be integrated under the condition of the same pin number in service, the usable field of the IC is increased, and the sale range of the IC is widened;
3. in terms of cost, the use requirement of the IC which needs to be packaged by SOP16 and the like can be met by using the package with fewer pins, so that the packaging cost is reduced.
The invention relates to a three-line key scanning method for T-type scanning key expansion, which adopts a three-line key structure, namely, a key is formed by three ports, one port is a public port, the original scanning mode that two ports form one key is reserved, and the method can maximize the number of keys under the condition of the same pin number, thereby facilitating a remote controller to greatly expand the application range of the remote controller according to different electrical appliance requirements.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (1)
1. A three-line key scanning method for T-type scanning key expansion is characterized in that: the method comprises the following steps:
the method comprises the following steps: under the condition that the original T scanning structure of the traditional remote controller can not be changed, aiming at the scanning mode of 'two-line key' of the traditional remote controller, a key for scanning three lines is added to form a three-line key scanning mode;
step two: in the three-wire key scanning mode in the first step, one port is extracted from the port of the original T scanning structure to serve as a public port, whether the port receives a key signal or not is preferentially detected during key scanning, if the key signal is received, the pressed key is considered to be a three-wire key, and then the other input port is detected to receive the key signal, so that which three-wire key is pressed can be determined; if the public port does not detect the port signal, other ports are continuously detected, and whether a key is pressed down is judged;
step three: in the three-line key scanning mode in the first step, the design method of the number of keys is as follows:
(1) aiming at n pins, under the condition that the n pins participate in T-type scanning of the traditional remote controller in the step one, n (n-1)/2 keys are realized;
(2) in the three-wire key scanning mode in the second step, one port is used as a public port, namely one pin is used as a public pin, so that the number of the rest pins is n-1, and the rest n-1 pins are subjected to T-type scanning to realize (n-1) (n-2) keys;
(3) and (3) aiming at the number of n (n-1)/2 keys and (n-1) (n-2) keys in the steps (1) and (2), when n is larger than 4, the number of keys obtained by the three-line key scanning mode in the step two is superior to the number of keys formed by the original T scanning mode of the traditional remote controller.
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| CN201910366515.6A CN110995276B (en) | 2019-05-05 | 2019-05-05 | Three-wire key scanning method for T-shaped scanning key expansion |
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| CN201910366515.6A CN110995276B (en) | 2019-05-05 | 2019-05-05 | Three-wire key scanning method for T-shaped scanning key expansion |
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| CN110995276B CN110995276B (en) | 2024-05-28 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63268337A (en) * | 1987-04-25 | 1988-11-07 | Matsushita Electric Ind Co Ltd | Key scan expanding device for integrated circuit for telephone control |
| CN101013896A (en) * | 2006-11-01 | 2007-08-08 | 深圳市菉华半导体有限公司 | Keyboard scanning circuit and scanning method thereof |
| CN101888250A (en) * | 2010-06-03 | 2010-11-17 | 无锡力芯微电子股份有限公司 | Key system and method thereof |
| CN102289293A (en) * | 2011-06-28 | 2011-12-21 | 埃派克森微电子(上海)股份有限公司 | Press key detection device and method |
| CN103354455A (en) * | 2013-08-05 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Key scanning method and circuit of triangular keyboard and triangular keyboard device |
| CN204481799U (en) * | 2015-03-24 | 2015-07-15 | 深圳市明芯微电子有限公司 | A kind of keyboard scanning circuit |
| CN210867651U (en) * | 2019-05-05 | 2020-06-26 | 广州安广电子科技股份有限公司 | Three-line key scanning device for T-type scanning key expansion |
-
2019
- 2019-05-05 CN CN201910366515.6A patent/CN110995276B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63268337A (en) * | 1987-04-25 | 1988-11-07 | Matsushita Electric Ind Co Ltd | Key scan expanding device for integrated circuit for telephone control |
| CN101013896A (en) * | 2006-11-01 | 2007-08-08 | 深圳市菉华半导体有限公司 | Keyboard scanning circuit and scanning method thereof |
| CN101888250A (en) * | 2010-06-03 | 2010-11-17 | 无锡力芯微电子股份有限公司 | Key system and method thereof |
| CN102289293A (en) * | 2011-06-28 | 2011-12-21 | 埃派克森微电子(上海)股份有限公司 | Press key detection device and method |
| CN103354455A (en) * | 2013-08-05 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Key scanning method and circuit of triangular keyboard and triangular keyboard device |
| CN204481799U (en) * | 2015-03-24 | 2015-07-15 | 深圳市明芯微电子有限公司 | A kind of keyboard scanning circuit |
| CN210867651U (en) * | 2019-05-05 | 2020-06-26 | 广州安广电子科技股份有限公司 | Three-line key scanning device for T-type scanning key expansion |
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