P2 Evaluation Board - Brief Update December 18th
Ken Gracey
Posts: 7,392
Hey there,
Chip is really staying on task to get these boards shipped to you. Last night when I left Parallax he was still there with David, sorting out the process to test/characterize them. It's a process of programming the FTDI chip, checking the power supply voltages, and hopefully passing the boards. There's a RasPi doing much of the work. I see this getting accomplished if we can minimize demands on Chip elsewhere.
We have about 135 orders but probably around 100 boards (+/- depending on yield results). This means we'll need to make some decisions, which will largely be left to Chip. The priority seems to be tool developers and contributors to the design, sequence in which orders were placed, providing one instead of two (about eight people ordered two units), etc. This is what that big red text wall was about on the order page, so hopefully nobody gets too irate with us if your Chipmas doesn't happen.
A few photos are below.
Ken Gracey
Chip is really staying on task to get these boards shipped to you. Last night when I left Parallax he was still there with David, sorting out the process to test/characterize them. It's a process of programming the FTDI chip, checking the power supply voltages, and hopefully passing the boards. There's a RasPi doing much of the work. I see this getting accomplished if we can minimize demands on Chip elsewhere.
We have about 135 orders but probably around 100 boards (+/- depending on yield results). This means we'll need to make some decisions, which will largely be left to Chip. The priority seems to be tool developers and contributors to the design, sequence in which orders were placed, providing one instead of two (about eight people ordered two units), etc. This is what that big red text wall was about on the order page, so hopefully nobody gets too irate with us if your Chipmas doesn't happen.
A few photos are below.
Ken Gracey
Comments
All that makes sense, but I would suggest at least one test bench has 2 x P2's so the P2-P2 links/speeds can be fully tested.
Maybe a P2D2 plus a P2 Eval can manage that ? (Which means you should keep a table of who has working P2D2's too ?)
Ditto
120 built
2 with VonSzarvas (designed the PCB)
1 with Ken
1 with me
2 with analog pin problems (ON Semi will cull these in the future)
1 that sometimes resets after download, not sure why
1 in rework that needs two tiny LDO's rotated
112 good, shippable
Tomorrow these will start shipping out.
Happy Chipmas
Good call David.
It’s a chipmas miracle!
Are ALL the pins having the problem? if not, I could use one of those, to add to the count.
Sometimes resets? I could put up with that.
Send me one of those instead if it means I or someone else won't fall off the list!
Merry Chipmas !!
J
We are going to fix the board with the reset problem. I gave it a thorough washing and drying last night, and then reset was stuck at ground, so there's something wrong at the PCB/parts level.
The boards that have bad analog I/O pins are totally usable, excepting those certain pins that are bad.
135 - 112 = 23
I think there were 23 boards left when I ordered mine. Seems fitting.
Ken Gracey
I am waiting to play when it is "regularly" available. I'm overjoyed to let the experts play first.
Now - if it was an S4... The story would be very different - I'd probably drive to Rocklin to get one!
Crumbs, I ordered number 11.
We'll see how it shakes out. "It ain't over 'till it's over"
So the yield in terms of silicon is 98.3%. That is good! And you had one board with a resistor shorted during soldering.
In my experience, boards with components shorted are frequent when I'm soldering them. Only yesterday, I came across with one that had a short to ground across a capacitor somewhere, just after the LDO. It was just a whisker, and it was solved by letting an hefty amount of current pass (had to supply 3,3V using an external power supply for that). Happens a lot with solder paste.
Kind regards, Samuel Lourenço
Hopefully not Year End Closeout.
Mike