IC660EBD025 | GE | External touch points module

Description

IC660EBD025 | GE | External touch points module

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Turn off the grounding of the external touch point to float it, and then connect the sampling capacitor (CHOLD) directly to the external touch point through the ADC channel setting. At this time, the IC660EBD025  charge will flow outward to the parasitic capacitor Cpad of the touch point. Because the external parasitic capacity is very small, this discharge will quickly achieve a charge balance voltage point. At this point, starting the ADC for conversion can obtain the forward charging and discharging values of the touch buttons.

The following is a simplified diagram of the capacitance distribution of a standard touch point. The wiring and touch points of the original PCB already have parasitic capacitance; The human body itself also has parasitic capacitance. When the finger approaches or touches the touch pad, Cp and CF will increase due to the addition of parallel capacitors. On the contrary, if the touch point is not touched, there will be no external influence to change its parasitic capacitance. The connotation of IC660EBD025  is to measure the voltage change on the capacitor within this unit of time to determine whether there is touch or proximity to the sensing point.
In fact, through the processing of IC660EBD025  one and two, we can already separate the actions of the touch buttons. But to enhance the anti-interference ability of the buttons against noise, a negative charging and discharging action was performed in step three. That is to charge the external parasitic capacitance to Vdd first, and CHOLD connects to the ground through internal settings to discharge the charge first.

Mailbox：sauldcsplc@gmail.com |IC660EBD025
www.abbgedcs.com | Qiming Industrial Control | Simon +86 13822101417

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