4 Host MCU

The SAMD21E18A device is utilized as the host MCU for the MTCH2120 EVK. The host MCU is responsible for reading and writing tuning data from the MTCH2120. Additionally, the host MCU controls the LED driver to indicate button touch status.

The host MCU fetches data from the MTCH2120 device approximately every 35 milliseconds and sends the data to the Touch Plugin. Clicking the "Start Query from MTCH2120/Stop Query from MTCH2120" button in the MPLAB Data Visualizer can start or stop continuous fetching.