Digital keying circuit and keying equipment

A button and circuit technology, applied in the circuit field, can solve the problems of adding a large number of diodes, poor practicability, inapplicability, etc., and achieve the effect of optimizing circuit layout, low cost, and avoiding false detection

Inactive Publication Date: 2014-04-02
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can avoid the ghost problem, it needs to add a large number of diodes, and the cost is extremely high, so it is not applicable in actual production applications
[0011] To sum up, the design method of matrix keys cannot avoid the defect of false detection due to its own design defects; and the scheme of one-to-one correspondence between keys and IO, and the scheme of adding diodes to the matrix key circuit, the circuit is complex and costly. Too high, poor practicability, difficult to widely popularize and apply on multi-button devices

Method used

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  • Digital keying circuit and keying equipment
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  • Digital keying circuit and keying equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see Figure 7 , the present embodiment 1 provides a preferred scheme of the digital button circuit, which can make the voltage value collected by the analog-to-digital conversion module ADC more regular and easier to analyze and calculate, and further improve the Determine the accuracy of the button state. in particular:

[0048] The digital key circuit mainly includes a key rheostat unit R and an analog-to-digital conversion module ADC. The key rheostat unit R is preferably configured as follows: the key rheostat unit R includes a reference resistor R a and rheostat module R x , corresponding to pressing any different button, or when multiple buttons of different combinations are pressed simultaneously, the rheostat module R x The resistance value changes accordingly, that is, the rheostat module R x The resistance value changes with different button states; the rheostat module R x One end of each is connected to the reference resistor R a and the analog-to-digi...

Embodiment 2

[0051] see Figure 8 , this embodiment is based on the first embodiment, and is an optimal design solution for two buttons. The technical solution disclosed in the first embodiment also belongs to this embodiment, and the technical solution disclosed in the first embodiment will not be described again. in particular:

[0052] The digital key circuit mainly includes a key rheostat unit R and an analog-to-digital conversion module ADC. The key rheostat unit R is preferably set to: include a reference resistor R a and two button resistors R b and R c , and includes two key switches K 1 and K 2 . The reference resistor R a , Button resistance R b and key resistor R c sequentially connected in series, the key switch K 1 with the key resistor R b connected in parallel, the key switch K 2 with the key resistor R c connected in parallel, the key resistor R c ground, the reference resistor R a Connect one end of the power supply V CC , and the other end is respectively ...

Embodiment 3

[0065] see Figure 8 , this embodiment is based on the first embodiment, for the optimal design of the three buttons, the technical solution disclosed in the first embodiment also belongs to this embodiment, and the technical solution disclosed in the first embodiment will not be described again. in particular:

[0066] The digital key circuit mainly includes a key rheostat unit R and an analog-to-digital conversion module ADC. The key rheostat unit R is preferably set to: include a reference resistor R a and three button resistors R b , R c and R d , and includes three key switches K 1 、K 2 and K 3 . The reference resistor R a , Button resistance R b , Button resistance R c and key resistor R d sequentially connected in series, the key switch K 1 with the key resistor R b connected in parallel, the key switch K 2 with the key resistor R c connected in parallel, the key switch K 3 with the key resistor R d connected in parallel, the key resistor R d ground, ...

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Abstract

The invention discloses a digital keying circuit and keying equipment. The circuit comprises a key rheostatic unit and an analog-digital conversion module, wherein the resistance value of the key rheostatic unit correspondingly changes when any of different keys is correspondingly pressed or multiple keys in different combinations are pressed at the same time; one end of the key rheostatic unit is connected with a power supply, and the other end of the key rheostatic unit is grounded; the analog-digital conversion module is connected with the key rheostatic unit and is used for acquiring the corresponding voltage values corresponding to different resistance values at the connection part, and the corresponding voltage values are used for judging the state of the key. The keying equipment is provided with the digital keying circuit. According to the digital keying circuit, the state of the key is judged by detecting the variation of the voltage value, so that the problem of mistaken detection is effectively avoided. The keying equipment provided by the invention effectively avoids the problem of a Ghost key.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a digital key circuit, which can effectively avoid the false detection phenomenon of pressing multiple keys at the same time, and to a key device with the digital key circuit. Background technique [0002] With the continuous development of electronic products, various products closely related to people's lives have also entered the smart era, such as smart phones, pads, smart TVs, etc. Peripheral accessories around smart devices are also springing up in front of people. [0003] In terms of peripherals and accessories of smart products, many of them need digital keys to realize, such as mouse, keyboard, and gamepad (gamepad). Most of these products, because of limited functions, usually do not process the collected data, they just upload the original data to the host (host) for processing, so there is no need for a high-performance MCU (microprocessing unit) to process Contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M11/20
Inventor 刘鑫鹏孔庆磊
Owner QINGDAO GOERTEK
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