[Cryptech Tech] STM32F4 <-> Novena Bridge

Fredrik Thulin fredrik at thulin.net
Sun Jun 14 14:08:45 UTC 2015


On Saturday, June 13, 2015 12:56:37 PM Fredrik Thulin wrote:
...
> I've gone through ST AN4488 and added everything I believe is needed for the
> STM32 circuit. I hope to be able to fit the FT232H in the bottom right
> corner, but if I don't I think I'll grow the board to the south 

Haha, maybe I could fit the FT232H in the corner but not the boatload of 
surrounding components it rode in with.

Question for anyone feeling they know their capacitors: the reference circuit 
in section 6.1 of the FT232H datasheet [1] shows electrolytics for the 4.7 uF 
bypass capacitors. Can they be reasonably substituted with simpler and smaller 
ceramics, thinking 0803 package and X7R (even better 0603 but I can only find 
X5R)?

[1] http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT232H.pdf

/Fredrik
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