3.2 External Host MCU Selection

The MTCH2120 Evaluation Kit has an on-board host MCU (SAMD21E18A) to communicate with the MTCH2120 via I2C. The Kit can use the on-board host or an external host.

Follow the following steps to connect the on-board MTCH2120 with an external host MCU By default the kit is connected to on-board host MCU. To connect the external host, follow the steps below:

  1. Modify the PCB jumper, which is ordinarily closed between J5 and J4, by cutting it.
    Figure 3-1. PCB Bottom Side
  2. Solder the solder pad between J4 and J3. Alternatively header can also be used for flexibility.
    Figure 3-2. PCB Top Side
  3. Mount Header J6 and connect to the external host board.