Chris Wilkson wrote:
> We had some limited success. The person who does acid dipping
> went home at
> 5, so we couldn't "do it right". So we had to saw/grind the plastic case
> away. Everything was great, but then...we found out that the back of the
> case wasn't smooth...we polished away a quarter of the die! (Yet, the
> opposite corner still had plastic over it.) So...
Hmmm... I wonder if there is some temperature at which the plastic will
melt/burn but not destroy the silicon and whatever other metals are used
between the layers of the chip? I mean solder will melt first but other
than that the chip might still be O.K. Hmmm... I wonder what happens if you
put a plastic I.C. in a self-cleaning oven during the cleaning cycle...
> For those of you unfamiliar with the process, what I'll do is polish away
> the circuitry, layer by layer, taking photos as I go. It looks like it
> maybe on the order of a micron per layer. Then the *hard* work begins...
> assembling a schematic from the photos. Ouch! At least there seem to be
> relatively few layers. Oh...and not many transistors...I'm guessing a
> couple thousand-ish?
That's probably a pretty good guess. Maybe even smaller than that. Maybe
less than a thousand. But I'd sure like to see some of the pictures. Oh
well, I guess I can wait for the touch controllers a while longer. Good
Luck!
John
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