New version

We have shrunk the module by going 4 layer. You can find the new smaller version available in the 'small' directory on github. The large version hasn't changed much, though we did redo it's layout in an attempt to see if we could add more components on the same board size. To shrink any further, we will need to switch to the much smaller WLCSP 3x3mm version.

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K.C. Lee wrote 10/28/2014 at 17:10

You can get even smaller crystals. e.g. Murata 24MHz hybrid: XRCGB24M000FAN00R0 available from Digikey. There is only so small you can make the board until you run out of space on the board edge for the I/O breakout. :)

At 2mm x 1.6mm, they are not much bigger than a cap. I used 3 of those packages here: https://hackaday.io/project/1347-fpga-computereval-board

Very nice M4 chip! I would use that instead of the Freescale K22 if it was available sooner.

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Chris Hamilton wrote 10/28/2014 at 17:44

Thanks, I have noticed a few options in 2.0x1.6. For the Flex Modules, the limiting size factor is trace layout for the 2.54mm pins. Originally, I planned to make smaller non-breadboard versions and it may still happen if there is interest and I can design a similarly small power supply.

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STM32F411

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