[Cryptech Tech] Novena dev-bridge board status

[Jacob]

On 6/24/2015 1:26 PM, Fredrik Thulin wrote:
> On Wednesday, June 24, 2015 12:17:06 AM Павел Шатов wrote:
> ...
>
> Thanks! I'm ordering this board as it is now to put an end to the tweaking =).
>
> /Fredrik

There are still issues which I recommend to correct before ordering. Not 
"tweaking" but actually corrections. Again, the board might work without 
those corrections, but it might not.

I have not downloaded the latest design files from today, so if they are 
already fixed - all for the better.

1. Crystals Y1 and Q1 (why different prefixes) each has 2 GND pads. 
These are not connected to the GND plane as they should, and neither the 
schematic shows such connections. The crystal body should be grounded to 
avoid parasitic capacitance to affect crystal stability and to minimize 
unwanted leakage.

2. I know that there are issues with the AGND and GND in regard to the 
noise source, but it will take me a couple of hours or so to nail it 
down with a good explanation. I fire this mail to the list so Fredrik 
can hold off the release to production.


There is a reason why I would like to have a schematic done and approved 
under a CDR (Critical Design Review) before commencing on layout :-)

acob