Post
Topic
Board Hardware
Re: [WIP] Lunch-Box-48 -{small time avalon based miner}-
by
DaGreatRV
on 31/07/2013, 15:36:52 UTC
So, it's been a while, I've found a job and that frees up a bit of time which I can send on this project.
The design is almost ready, just the bottom side soldermask needs to be edited to allow as much contact with the groundplane to the heatsink.
So here it is. (i'll put some better ones on the git)

http://s22.postimg.org/5p1ogyuq9/ASIC_card_overview.jpg

This has all four layers visible, so it's not that clear. Anyway lets say something about it... It looks like a mess. Which was not unintended.  Wink The parts are in the richt places, switching nodes and inductors are kept away from sensitive bits as much as possible.
The clock lines are very prominent on the toplayer. They get a lot of space, that prevents interference with other parts, also it prevents the line from behaving like a coplaner waveguide, which would mess up my impedance calculations.


http://s21.postimg.org/7andsbvbb/ASIC_card_detail1.jpg

I added footprints for an extra electrolytic cap just in case the ripple on the supply can't be handled by the asics. (C88)
Also R15, the current limit setting resistor might be left out if that function doesn't work well due to a slow rising 12V

More to come...