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Topic: Bus Blaster update (Read 19019 times) previous topic - next topic

Re: Bus Blaster update

Reply #31
This board just came in. There was a problem with IC6/7/8 footprints, the mask is on top of the pads.

That's OK, because I can sand it off and test out the circuit.

If we have to do another revision, we can probably use these for full 5.0-1.8volt level translation in the final version.

http://focus.ti.com/docs/prod/folders/p ... c1t45.html
http://focus.ti.com/docs/prod/folders/p ... c2t45.html
http://focus.ti.com/docs/prod/folders/p ... 8t245.html
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Re: Bus Blaster update

Reply #32
Finished soldering this yesterday, did the power up test just now. It powers and enumerates fine :)

There's two hold-ups on this design though
1 - the footprint for one of the buffer chips (IC6,7,8) had mask over the pads, so it will need to be scraped away to solder the buffer.
2 - since sending the design, we finally found the perfect 1.2volt-5.5volt buffer, if we have to revise anyways, we might as well test that.

Picture attached.
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Re: Bus Blaster update

Reply #33
@Ian,

1. Is there a BoM for this version of the board (say if someone won a PCB and wanted to build it out :) ?

2. Have you hit up TI for samples of the sn74lvcXt45 buffers?  Would they work on the current board?

-C

Re: Bus Blaster update

Reply #34
The first post on this thread has the files for the Free PCB Sunday version, that should include part values:
http://dangerousprototypes.com/forum/in ... 75#msg8175

There is some discussion of the buffer on the wiki:
http://dangerousprototypes.com/docs/Bus ... onnections

The board can take the LVC or AVC version. I have the avc and lvc2t45, but there is no lvc version of the SN74AVC4T245 (or we'd have a perfect design!)

I will add the updated partlist to the wiki too by the end of the day.
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