What is the principle of touch button Touch button principle introduction
Date: 2022/10/19Read: 22
There is an inductive capacitance between any two conductive objects. A button, namely, a solder pad and the earth, can also constitute an inductive capacitance. Under the condition that the surrounding environment is unchanged, the value of the inductive capacitance is a fixed and constant small value. When a human finger is close to the touch button, the inductive capacitance made by the human finger and the earth in parallel with the inductive capacitance made by the earth solder pad will increase the total inductive capacitance value. Capacitive touch button IC will output a confirmed signal that a key has been pressed after detecting a change in the inductive capacitance value of a key. Capacitive touch button because there is no mechanical structure, all the detection is the small change of electricity, so it will be more sensitive to various interference, so the design of touch button, touch panel design and touch IC selection are very critical.
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