CN210867651U

CN210867651U - Three-line key scanning device for T-type scanning key expansion

Info

Publication number: CN210867651U
Application number: CN201920625009.XU
Authority: CN
Inventors: 黎章宇; 蔡俊; 何普兴; 吴俊�; 谭体伟
Original assignee: Guangzhou Anguang Electronic Technology Co ltd
Current assignee: Guangzhou Anguang Electronic Technology Co ltd
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2020-06-26
Anticipated expiration: 2029-05-05

Abstract

The utility model relates to the technical field of remote controllers, in particular to a three-wire key scanning device for T-type scanning key expansion, which comprises a three-wire key main body, wherein the three-wire key main body comprises a key, the key comprises two pins I which are respectively a first pin and a second pin, and the first pin and the second pin are electrically connected with chip pins in a non-public end area of a control chip worker C with the same T scanning structure as the traditional remote controller keyboard through two leads I; the remote controller keyboard also comprises a third pin, wherein the third pin is connected with an expansion line, and the expansion line is electrically connected with a chip pin at a common end region of a control chip IC with the same T scanning structure as the traditional remote controller keyboard; the two leading wires I and the one expanding wire form a three-line scanning structure; 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

Three-line key scanning device for T-type scanning key expansion

Technical Field

The utility model relates to a remote controller technical field, in particular to three-way button scanning device for T formula scanning button extension.

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.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a three-way button scanning device for T formula scanning button extension to prior art's defect and not enough.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model discloses a three-way button scanning device for T formula scanning button extension, it includes three-way button main part, this three-way button main part includes the button, this button includes two pins one, these two pins one is first pin and second pin respectively, this first pin and second pin are connected through two lead wires one and the chip pin electricity in the non-public terminal area of the control chip IC that traditional remote controller keyboard's T scanning structure is the same;

the remote controller keyboard also comprises a third pin, wherein the third pin is connected with an expansion line, and the expansion line is electrically connected with a chip pin at a common end region of a control chip IC with the same T scanning structure as the traditional remote controller keyboard; the two leading wires I and the one expanding wire form a three-line scanning structure.

Further, the chip pins of the control chip IC having the same T-scan structure as that of the conventional remote controller keyboard form a common terminal area.

Further, the non-common terminal area of the control chip having the same T-scan structure as the conventional remote controller keyboard is: and the other chip pins except the second chip pin form a non-common end area.

The utility model discloses beneficial effect does: a three-way button scanning device for T formula scanning button extension, it adopts three-way button mode, has under the condition of the same pin quantity, can maximize increase button quantity to make things convenient for the remote controller to need different electrical apparatus, greatly extend the application range of remote controller.

Drawings

FIG. 1 is a circuit schematic of a conventional T-scan;

FIG. 2 is a schematic circuit diagram of a three-line scanning non-common terminal portion of the present invention;

FIG. 3 is a schematic circuit diagram of the three line scanning common terminal portion of the present invention;

FIG. 4 is a system connection diagram of the present invention;

FIG. 5 illustrates a program-determined logical topology of the present invention;

FIG. 6 is a diagram of the conventional T-scan circuitry of the present invention and the bond wires of the three-wire scan non-common end portion of the present design;

fig. 7 is a diagram of a push-to-wire connection of a three-line scanning common end portion in accordance with the present invention.

Description of reference numerals:

1. pressing a key; 2. leading a first wire; 3. and (5) expanding the line.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1-5, the utility model discloses a three-way key scanning device for T-type scanning key extension, it includes three-way key main part, this three-way key main part includes button 1, this button 1 includes two pins one, these two pins one is first pin and second pin respectively, this first pin and second pin are connected with the chip pin electricity in the non-public terminal area of the control chip IC that the T-scan structure of traditional remote controller keyboard is the same through two lead wires one 2;

the remote controller also comprises a third pin, the third pin is connected with an expansion line 3, and the expansion line 3 is electrically connected with a chip pin at a common end region of a control chip IC with the same T scanning structure as the traditional remote controller keyboard; the two leading wires I2 and the expansion wire 3 form a three-line scanning structure.

Further, as shown in fig. 3, the chip pins of the control chip IC having the same T-scan structure as that of the conventional remote controller keyboard form a common terminal area.

Further, as shown in fig. 2, the non-common terminal area of the control chip having the same T-scan structure as the conventional remote control keyboard is: and the other chip pins except the second chip pin form a non-common end area.

In the design, under the condition that the original T scanning structure of the traditional remote controller can not be changed, aiming at the scanning mode of the two-line key of the traditional remote controller, a key for scanning three lines is added to form the scanning mode of the three-line key.

As shown in fig. 2, for a chip with two wires and one key of a conventional remote controller, a second chip pin is used as a common pin to form a common terminal area; taking other chip pins except the chip pin II in the chip as non-public end regions, wherein the two chip pins in the non-public end regions are electrically connected with the two pins I in the design through two leading wires I2 respectively, and the chip pin II is electrically connected with the third pin in the design through a development line 3; and forming a three-line key, and scanning the key 1 by utilizing two leading wires I2 and one extension wire 3 to form a three-line scanning structure.

To further illustrate the working principle of the present design, the following is specifically stated:

when the design is used, the following steps are adopted:

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 greater 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 of the traditional remote controller.

The utility model discloses a concrete embodiment 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, a chip pin II of an IC is independent 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, newly introduced three-line scanning is formed by the key 1, a chip pin II 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 II 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 part of the present invention; the two pins of the key 1 are connected with two leads I2. FIG. 7 is a drawing of a push-to-wire connection of a common end portion of a three-line scan according to 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 utility model has the advantages as follows:

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.

A three-way button scanning device for T formula scanning button extension, it adopts three-way button structure, constitutes a button by three port promptly, one of them port is the common port to keep the scanning mode of original two ports constitution buttons, it has under the condition of same pin quantity, can maximize increase button quantity, thereby make things convenient for the remote controller to different electrical apparatus needs, greatly extend the application range of remote controller.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims

1. A three-wire key scanning device for T-type scanning key expansion comprises a three-wire key main body, wherein the three-wire key main body comprises a key (1), the key (1) comprises two pins I, the two pins I are respectively a first pin and a second pin, and the first pin and the second pin are electrically connected with chip pins in a non-public end region of a control chip IC (integrated circuit) with the same T scanning structure of a traditional remote controller keyboard through two leads I (2);

the method is characterized in that: the remote controller also comprises a third pin, the third pin is connected with an expansion line (3), and the expansion line (3) is electrically connected with a chip pin of a common terminal area of a control chip IC with the same T scanning structure of the traditional remote controller keyboard; the two leading wires I (2) and the expansion wire (3) form a three-wire scanning structure.

2. The three-wire key scanning device for the T-scan key expansion of claim 1, wherein: the chip pins of the control chip IC which have the same T scanning structure as the traditional remote controller keyboard form a common terminal area.

3. The three-wire key scanning device for the T-scan key expansion of claim 1, wherein: the non-common terminal area of the control chip IC which is the same as the T scanning structure of the traditional remote controller keyboard is as follows: and the other chip pins except the second chip pin form a non-common end area.