From little Seeeds

From little Seeeds do mighty oaks grow

Sunday 15 April

So we got a new puppy last week, and most of my time has been taken up with her, but I did ping seeed to see what the delay was on the board, since I've been waiting on it for over a month now. It turns out there were two problems (both my fault) which were holding up the assembly. They sent me the below ...

Stacks Image 1285

... and pointed out two things:

1) The part I'd specified in the assembly BOM for U$9 (which they had dutifully ordered) was the wrong form-factor. I'd gone to the schematic to find the part, searched at Digikey (which brought up a whole selection of form-factors for the part) and given them SN74CBTLV3257PWR as the manufacturer's designation, rather than SN74CBTLV3257DR. That's a TSOP-16 part as opposed to the actual SOIC-16 form-factor that was required; there's no excuse, I just wasn't paying sufficient attention. If they have any of the SN74CBTLV3257DR in stock (I doubt it), they'll create the board with those parts, but I'm expecting to be shipped boards which don't have that part soldered. I can solder a SOIC-16 part, so it's not the end of the world, but I am annoyed with myself for this one.

2) The second error was that there's no silkscreen for the XMOS chip, so they didn't know where pin-1 was. There is a silkscreen in the Eagle layout...

Stacks Image 1294

... and I hadn't caught the problem when reviewing the gerbers. Still, that was easy to sort out - I just sent them a modified version of the first image above, indicating which pin was pin-1, and a copy of the second image for good measure.

3) U$10 is highlighted in their image, but apparently they didn't need any help with that after all - I confirmed with them that there was nothing more they needed from me after resolving the above 2 issues.

I would have been happier if they'd reached out to me when they found the problem, rather than waiting for me to get in touch, but all's well that ends well. The boards ought to be shipping to me on Wednesday. Who knows, with the puppy around, I may even find time to do something with them when they turn up [joking]...

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