New pictures from the manufacturing process of the tinyK20 boards. Now all parts to be populated have been arrived at the manufacturing, so populating the boards can start soon:
tinyK20 PCB Bottom
tinyK20 PCB Top
As for an urgent need we cannot wait until we get all the boards with the parts populated, we have received boards we can populate internally ourselves:
tinyK20 Boards, unpopulated (Source: Ch. Battista)
A first board put on another board:
tinyK20 Board
Happy Boarding 🙂
MCU on Eclipse 
HI! There are any hope to sell some of this boards with the parts in disassembled way(like a kit)?
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We only have these 8 board (not populated), and one is already populated. We probably need some of the other boards until we receive the populated boards mid of Nov. We will have to serve first the needs of the students and our research projects, but if there are left-overs, why not? But it has not been decided. What would be an acceptable price for you (excluding shipping)?
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Nice! A price like teensy boards maybe a little less… What do you think?
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Yes, with the current number of boards the BOM/production costs are at or little above that level ($20). Optional add-ons could be: side headers, sd card socket, 32 kHz clock source, SWD cable. We will see with the final bill which includes FAT/customs/etc. I think that board can be produced in volume probably in the $15 range.
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Hi Erich,
What are the dimension for the board (length and width) and is it a 4 or 2 layer design?
Did you do any impedance matching for the USB? or are the trace lengths so short this is a none issue?
Thanks
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48×19 mm, 2 layers. The USB lines are very short, so no issue.
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would 4 layers not have made the design simpler? i guess the cost would have been greater though.
Have you published the schematics? or is the design closed source?
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Yes, 4 layers would have made it simpler somewhat, but making two layers is less expensive, and we were able to produce the initial boards in-house.
The design is open source, and Eagle files are here:
https://github.com/ErichStyger/mcuoneclipse/tree/master/tinyK20
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Erich, this looks pretty good and it’s also a great idea of using the OpenOCD . Do you plan to have a set of binaries for flashing the debug app? I think this is the feature makes the TinyK20 a great idea.
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Hi Marco,
you can load the normal mbed bootloader and then load any OpenSDA application you like.
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These look great. On a related note, it worries me that moving forward Freescale is dropping QFN packaging for newer K2x chips — the really nice K22F, for example, is only available in HUGE LQFP packages or in small-pitch BGA (which is completely unsuitable for hobby production). You could not make a board like this one with an LQFP-100 K22F, for which just the chip body is 14mm x 14mm!
I’m still hoping Freescale will turn around and make some QFN-packaged chips, because for now this is a worrying development. Enjoy the K20 boards, because you won’t get this form factor with newer K2x chips…
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