An anti-interference capacitive touch key controller and an implementation method thereof
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A realization method and controller technology, applied to electrical components, electronic switches, pulse technology, etc., can solve problems such as wrong touch actions, high cost, and poor anti-interference effects
Active Publication Date: 2018-12-18
CHINA KEY SYST & INTEGRATED CIRCUIT
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[0006] The purpose of the present invention is to provide an anti-interference capacitive touch button controller and its implementation method, so as to solve the problem that the wrong touch action is often caused by electromagnetic interference, and the existing anti-interference means are not effective and the cost is high
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Embodiment 1
[0026] The invention provides an anti-interference capacitive touch key controller, its structure is as follows figure 1 shown. The anti-interference capacitive touch key controller includes a touch key I0, an electrode capacitor Cx, a sampling capacitor Cs, an antistatic resistor Rx, an electronic component I1, a counter I2 and a register REG. Specifically, one end of the touch button I0 is grounded through the electrode capacitance Cx, and the other end is connected to one end of the antistatic resistor Rx; the other end of the antistatic resistor Rx is connected to the first reset switch S1 and the charging switch S3 respectively. , the charge transfer switch S4 is connected; the other end of the first reset switch S1 is grounded; the other end of the charging switch S3 is connected to the charging power supply VDD, the other end of the charge transfer switch S4 is connected to the sampling capacitor Cs, the second reset switch S2 and electronic components I1; the sampling...
Embodiment 2
[0030] The present invention provides a method for implementing an anti-interference capacitive touch button controller, the flow chart is as follows figure 2 shown, including the following steps:
[0031] Step S31, the clock generator generates a variable frequency pulse clock PGC2;
[0032] Step S32, the power supply VDD charges the electrode capacitor Cx;
[0033] Step S33, the charge of the electrode capacitor Cx is transferred to the sampling capacitor Cs until the terminal voltages of the two capacitors are equal;
[0034] Step S34, measure the terminal voltage of the sampling capacitor Cs, if it reaches the reference voltage Vref of the comparator, or the reversal voltage of the inverter or the Schmitt trigger, the counter outputs, and completes a single detection;
[0035] Step S35, the controller interrupts, reads the number of register transfers, and judges whether there is a touch button action.
[0036]Specifically, step 1: firstly, the anti-interference capaci...
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Abstract
The invention discloses an anti-interference capacitive touch key controller and an implementation method, belonging to the technical field of touch sensing. The controller includes a touch key, electrode capacitor, sampling capacitor, antistatic resistor, electronic component, counter and register. One end of the touch key is grounded through the electrode capacitance, and the other end is connected with the first reset switch, the charge switch and the charge transfer switch through the anti-static resistance respectively. The other end of the first reset switch is grounded; The other end ofthe charge switch is connected with a power supply VDD, the other end of the charge transfer switch is connected with a sampling capacitor, a second reset switch and an electronic component. The other ends of both the sampling capacitor and the second reset switch are grounded, and the electronic components are output to the counter, which is connected to the register. Through the pulse clock with variable charging and discharging frequency, the spectrum energy is evenly distributed to a certain range of frequencies, avoiding resonance with the energy peak of high-frequency interference signal, improving the robustness of charge transfer acquisition and detection, and improving the anti-interference ability.
Description
technical field [0001] The invention relates to the technical field of touch sensing, in particular to an anti-interference capacitive touch key controller and a realization method. Background technique [0002] In recent years, with the wide application of touch technology, capacitive touch for button applications has shown rapid growth. Capacitive touch buttons not only appear in high-end products such as TVs, monitors, and smart homes, but have also penetrated into consumer electronics. every aspect. [0003] Most of the touch key switches adopt the capacitance measurement method. Specifically, the change of the capacitance value of the sensing point is judged by calculating the change of the charge on the capacitance at the sensing point, so as to determine whether the touch action occurs. The document with the publication number CN101060321A discloses a touch sensing method. During specific implementation, the occurrence of a touch action is judged by measuring the cha...
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