ST's Capacitive Touch Button Solution 3

Memory is a component used to store programs and data. With memory, computers can have memory function and ensure normal operation. It stores and retrieves information based on the location specified by the controller.

Interference in the working environment of induction cookers  diode,

1. Electromagnetic interference

While heating the pot, the induction cooker also induces forward or reverse currents on the circuit board, which can shorten or increase the charging and discharging time of the buttons, greatly affecting the detection of the buttons and even causing misoperation. Common methods include hardware shielding and zero crossing detection to eliminate the impact of electromagnetic radiation on the buttons.

Hardware shielding

In the STM8S solution, ST provides design specifications for sensing electrodes and wiring, as well as the Driven Shield function shown in Figure 3 (providing the same driving signal as the key pin on the Shield line, the parasitic B capacitance between the electrode and the Shield will not be charged or discharged), which can effectively reduce the impact of parasitic B capacitance on key sensitivity caused by sensing electrode wiring.    diode,