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1  Bitcoin / Group buys / Re: [CLOSED] Bitmine CoinCraft A1 28nm chip distribution / DIY support on: April 11, 2014, 07:33:54 PM
There is a TI TXB0106 -based level translator I made to talk to A1s. Requires VCC from the MCU board for high voltage side to function and translate correctly. Also provides 1.8V for A1s data interface. The LDO on the left is TI LP3871-1.8V. The circuit is trivial.

I need a second one and it takes too much time to build on a protoboard. I'm routing a PCB, will post when ready.


2  Bitcoin / Group buys / Re: [CLOSED] Bitmine CoinCraft A1 28nm chip distribution / DIY support on: April 09, 2014, 12:55:43 AM
Hello everybody

I've found a mess in the BOM of the two chips reference board!
So far the major issue is that there is a mixup of two versions: Ver. 1.0.a and Ver. 1.0.b.
The first evident difference is that the last release is missing C503 and C504, having therefore a different design.
In the repository there is a mix of files of the two versions and is impossible, at least for myself, to cross check diagram and BOM; I was doing such a check, finding some incongruences, when I discovered the problem.
If someone could help me to setup a 100% error free BOM, or at least provide me a diagram of the ver 1.0.b, I will appreciate very much and will be happy to send him/her a free PCB (I have 100 of them waiting to be populated).

Thank you

The only difference is R12. Take a look at my site, the notes should still be on the front page.
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