Capacitive sensing touch control key and key judging method thereof
A capacitive sensing and capacitive technology, applied in electrical components, electronic switches, pulse technology, etc., can solve the problems of occupying a lot of hardware resources, complex planning schemes, and high costs, so as to reduce the demand of MCU, suitable for low-cost applications, and occupying hardware The effect of low resources
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[0060] Example one, such as Figure 5 As shown, it is calculated by matlab. When the parameter VUh we choose is close to U, it can bring about an increase in time variation, thereby improving the accuracy of detection.
[0061] From Figure 5 We can see that, assuming R=500K, C=10PF, ΔC=10PF brought by human hands, Uh=0.5U, in the curve, if there is no pull-down resistor R2, that is, V=1, the time difference of charging flip is 3.4us (As shown in curve k1), the time difference of charging and reversal after the human hand brings the capacitor ΔC is twice the original (as shown in curve k1'); and when the resistance R1 / R2=2 / 3, that is, V=1.6 The time difference of charging reversal is 5.3us (as shown in curve k2), and the time difference of charging reversal after the human hand brings capacitance ΔC is twice the original (as shown in curve k2'); when the resistance R1 / R2=0.8, that is, V =1.8, the time difference of charging reversal is 6.6us (as shown in curve k3), and the time...
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