This is an elite-c compatible controller, but uses an STM32F411. This means more flash and more memory! If you plan on using a cirque trackpad, there are some known issues with AVR (pro micro and elite-c), so this is a great alternative.
See details about using the controller with fingerpunch boards here:
https://github.com/sadekbaroudi/fingerpunch/tree/master/stemcell
Note that in this version the jumpers on the back are pre-soldered, so you no longer need to solder them before using.
