The M4 Development Module is a breakout board on steroids. It was created out of necessity. During the development of the M4 ECU it was necessary to use a basic 48qfn breakout board to access all of the functions and capabilities of the MCU. I often ran into a clutter problem using the basic breakout because of the essential baseline "infrastructure" required to make the MCU operate. In order to clean up my breadboard I wanted to move the essential circuitry onto the breakout board its self while still having access to every pin on the MCU. As there were not any good commercially available boards that did this, I resorted to creating my own. The M4 Development Module contains all of the appropriate resistors and capacitors needed to facilitate normal operation as well as a USB C connector rated at 3.5A, a voltage regulator, a power indicator LED, a reset button, and a j-link programming connector. The USB-C connector is connected to the appropriate pins on the MCU to allow for USB interface development and the power and ground connections to the USB-C are also broken out to make them accessible on the breadboard. This is a simple board with a lot of capability. If your developing anything with the Atmel ATSAMD51 series 48qfn chips, this board is an essential tool.
M4 ECU with basic 48qfn breakout board and external infrastructure.
M4 ECU with M4 Development Module. Notice how much cleaner it is?