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Compared with traditional mechanical buttons, the touch chip mainly has the following characteristics: 1) Because it is not a mechanical button, the touch button has no mechanical damage, and the button life is longer, generally reaching more than 300,000 times. 2) There are no actual buttons on the operation panel, the overall appearance of the operation panel is better, and the appearance can be more novel. 3) The sensitivity of the touch button can be adjusted freely according to the sensitivity capacitance. 4) Since water vapor has little effect on the input capacitance, the touch buttons are better moisture-proof and waterproof. 3. Application of touch chip. When the finger touches the screen of the panel button, the finger acts as an electrode, the panel acts as the capacitor's intermediate medium, and the conductive medium under the panel is connected to the sensing pad on the PCB as the other capacitor. Electrode, thus forming an input capacitor. The input capacitance is compared with the built-in reference capacitance of the touch chip to output the differential signal, and then amplified by the amplifier circuit to get the high and low level at the output terminal (OUTPUT). The main MCU judges by detecting the level signal of the output port (OUTPUT) of the touch chip Check whether the finger touches the button to realize the touch button function.