SLAU857A May   2021  – July 2021 MSP430FR2476 , MSP430FR2512 , MSP430FR2522 , MSP430FR2532 , MSP430FR2533 , MSP430FR2632 , MSP430FR2633 , MSP430FR2672 , MSP430FR2673 , MSP430FR2675 , MSP430FR2676

 

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4.1.2.1 Copper-Clad Sensor (PCB)

This solution uses copper pads etched on the surface of the PCB as sensors, which is the most common implementation method for capacitive touch. Rigid PCBs are the most widely used and are suitable for flat front panels, while flexible PCBs are suitable for curved front panels. Flexible PCB is thinner than rigid PCB, which means that the distance between the button and the ground plane is relatively short. Therefore, the density of the grid ground plane should be appropriately reduced.