Method and system for quickly detecting multiple capacitive touch keys
A technology of touch detection and detection method, which is applied in the rapid detection method and system field of capacitive touch multi-button, which can solve the problems of reduced sensitivity, increased cost, and affecting the response speed of buttons, so as to ensure time uniformity and avoid idle waiting period , to achieve the effect of continuous detection
Active Publication Date: 2020-02-14
四川中微芯成科技有限公司
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[0005] The weak point of prior art is: execute according to fixed serial assembly line sequence to a plurality of buttons, when there are many buttons, the time of detecting all buttons will be longer and longer; Time slot), the controller is in the idle stage while waiting for the completion of charging and discharging. As the number of buttons increases, the idle time period also increases, which in turn affects the response speed of the buttons; the usual process is to scan each button sequentially. Press the button, and then focus on the signal processing of the button, which will cause discontinuous scanning of the button signal, discontinuous processing of the signal, and untimely response of the button
[0006] Common improvement methods include: increasing the main frequency of the controller, but the increase of the main frequency means the increase of cost and the increase of system instability; reducing the charge and discharge time of the capacitor, the reduction of the charge and discharge time may lead to the change of the capacitance that can be detected If the amount is too small, the sensitivity will decrease; reduce the number of buttons, and the reduction of the number of buttons may not meet the functional requirements of the application system
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[0024] Combine below Figure 1 to Figure 11 , the present invention is described in further detail.
[0025] In order to facilitate the understanding of the content of the present invention, the principle of touch key detection is firstly introduced here.
[0026] refer to figure 1 , There is a parasitic capacitance Cp between the touch detection element such as the electrode and its surrounding conductors such as the ground wire and the metal frame. The capacitor Cf is connected to the earth through the conductive human body.
[0027] The basic principle of capacitive touch buttons can be explained by the discharge characteristics of RC circuits, such as figure 2 shown. Continuing from the above, during the touch detection process, the touch detection element is charged by charge and discharge control, and the charged voltage is represented by Vp. case, the touch sensing element can be equivalent as figure 2 The RC circuit shown on the left, that is, can be equivalent...
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The invention particularly relates to a method for quickly detecting multiple capacitive touch keys, which comprises the following steps of (A) selecting any one touch channel, and detecting the touchchannel to obtain a detection result; (B) detecting the next touch channel and obtaining a detection result, and processing the previous detection result to generate key data; (C) repeating the stepB to circularly detect and process all the touch channels to generate continuous key data. The invention further discloses a system for detection. By adjusting the method, a previous detection resultis processed while the current touch channel is obtained for detection, so that the idle waiting period caused by charging and discharging scanning time slots can be avoided, the time uniformity of signal acquisition and data processing is ensured, and the data credibility and the continuity of key detection are improved.
Description
technical field [0001] The invention relates to the technical field of signal processing and control, in particular to a fast detection method and system for capacitive touch multi-buttons. Background technique [0002] With the improvement of living standards and the development of technology, there are more and more electronic products in people's lives, especially household appliances related equipment, such as induction cooker, microwave oven, rice cooker and so on. Due to the needs of more friendly input, more beautiful appearance, and easy cleaning, capacitive touch buttons are adopted by more and more household appliances; due to the needs of richer functions and easier operation, the number of capacitive touch buttons There is a growing trend; due to the need to respond to single or multiple buttons in a short time, the response speed of capacitive touch buttons is getting higher and higher. [0003] The response speed of the key is an important indicator of the cap...
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IPC IPC(8): H03K17/96G06F3/0487
CPCH03K17/9622G06F3/0487Y02D10/00
Inventor 周留洋
Owner 四川中微芯成科技有限公司