An anti-interference capacitive touch button controller and its realization method
A controller and capacitive technology, applied in the field of capacitive touch button controller, can solve the problems of high cost, poor anti-interference means, and wrong touch actions.
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Embodiment 1
[0026] The invention provides an anti-interference capacitive touch key controller, the structure of which is as follows: figure 1 shown. The anti-interference capacitive touch key controller includes a touch key I0, an electrode capacitance Cx, a sampling capacitance Cs, an anti-static resistance 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 capacitor Cx, and the other end is connected to one end of the anti-static resistor Rx; the other end of the anti-static 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 component ...
Embodiment 2
[0030] The present invention provides an implementation method of an anti-interference capacitive touch key controller. The schematic flowchart 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 inversion voltage of the inverter or Schmitt trigger, the counter outputs, and the single detection is completed;
[0035] Step S35, the controller interrupts, reads the transfer times of the register, and determines whether there is a touch button action.
[0036]Specifically, step 1: first, the anti-inte...
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