[Cryptech Core] Alpha rev.03

[Fredrik Thulin]

On måndag 30 maj 2016 kl. 10:26:01 CEST Peter Stuge wrote:
> Fredrik Thulin wrote:
> > > But I wish there would have been some more communication before the
> > > change went into a new order:
> > > 
> > > An 8-pin header with Vbus, 3v3, GND, FT_RESET, TX, RX, D+ and D-
> > > would have been best.
> > 
> > I agree, it would have been much better if you had communicated
> > that before Pavel made the new revision.
> 
> I would have made sure to communicate it in time, if I had known that
> a new revision would be ordered now. The new rev came as quite a
> surprise to me - maybe because I'm not on any telcos..

Ok, too bad. It's been the plan for a long time to get five boards, then make 
a bugfix revision and make 25-50 boards before Berlin. I do acknowledge that 
we haven't been the best at communicating using our e-mail lists though. Hope 
to make better there.

> > > 3v3 for correct TX voltage to the Alpha and to save an extra regulator.
> > 
> > As a workaround, you can get 3V3 from a number of the other pin headers
> 
> That's a good point! It requires a jumper cable but that may be
> simpler than a regulator - I'll see which is better. Thanks for the idea!

You are welcome. Actually, if you power using VBUS you would of course lose 
power to your MCU when the USB cable is unplugged, and I thought maybe that 
was undesirable.

What I was thinking was that you would make your daughter board fit over both 
the USB-UART headers, as well as the AVR GPIO header for increased stability, 
as well as to get the 3V3 then. Kind of like Arduinos and many dev boards have 
two rows of headers.

We should make a proper page at the Wiki for all the manufacturing files, but 
until then you can find the Gerbers that just went to production attached to 
this mail.

/Fredrik
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