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Re: gEDA-user: TQFP package problem



On Thu, 27 Jul 2006, watashi_metan@xxxxxxxxxxx wrote:

I have problem with gsch2pcb and
/usr/share/gEDA/sym/micro/ATmega128-3.sym.
I added this one to .sch file run gsch2pcb on it and get this result:

U1: can't find PCB element for footprint TQFP64 (value=unknown)
So device U1 will not be in the layout.

Other packages like DIP or SO are working but when I try to add
any of *QPF* I got the same problem.

Is there something I'm missing?

I'm have geda 20060123 and pcb 20060422 on gentoo x86. 

sounds like you don't have the right name.  Try "TQFP64_14" instead of
"TQFP64".  This would be a good candidate for IPC names and IPC
footprints but I haven't had time to do it.  To help get the right
footprint name, open up the library browser in PCB or look at
http://www.gedasymbols.org/footprints/ and the ~geda library.  The
correct footprint name is a link to a preview.

thanks a lot 

I'll take the opportunity to warn that descriptions like "64 pin TQFP"
are dangerous.  QFP's come in 0.5, 0.65, 0.8, and possibly 0.4 mm pin
pitch so you may find two QFP's with the same pin count but different
pin pitch.


Acording to datasheet from atmel.com atmega128 have two variants one is
some kind of bga
and the second is TQFP64_14. Then in my opinion it can be safely changed
from TQFP64 to TQFP64_14 in /usr/share/gEDA/sym/micro/ATmega128-3.sym.
Because it's quite a bit confusing when you add symbol from geda library
and it doesn't work.

Here's another reason to eschew heavy symbols in the gEDA distribution -- Newbies just assume that they will get the footprint they want from any particular symbol. Better,
IMO, to force everybody to manually assign the footprint after placing the symbol. That way you know what you are getting. Or at least you have only yourself to blame when things go awary.

Stuart


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