Re: gEDA-user: SSOP-36 element for PCB?

[Dan McMahill <dan@xxxxxxxxxxxx>]

Dave McGuire wrote:
> On Jul 30, 2005, at 5:32 PM, Dan McMahill wrote:
>
> > >   Hey folks...I'm laying out a board (with PCB of course) on which 
> > > I'm using a 36-pin SSOP package.  Does anyone have one handy, or will 
> > > I have to remember how to create elements again? :)
> >
> >
> > in the ~geda library there are some.  Do you have a JEDEC number for 
> > that family?  I'd double check the SSOP footprints though.  I've 
> > fabbed the TSSOP48 and its fine, but none of the regular SSOP ones.
>
>
>   I've just checked the datasheet (Maxim MAX6953) and I don't see a 
> JEDEC number in there anywhere.  I am now officially confused. =)
>
>   I suppose I could sit down and draw it, but I understand there's a 
> fancy way to use the M4 stuff to generate a whole family at once based 
> on certain parameters...that'd be far better I think.  As I recall, that 
> was the method you used about a year ago to generate the SOJ package 
> family for me, wasn't it?
>
>            -Dave
That is what I did.  M4 has its quirks to get used to, but it is 
basically pretty simple.  You define macros, then those macros get 
expanded.  You could look in geda.inc to see what I had to type in for 
the SOJ footprints.  footprint.ipc.org is sometimes a place to find some 
footprint sizes.  Generally I've put generic stuff like SO, SOJ, etc in
geda.inc and vendor specific stuff like a bourns trim pot in a vendor
library like bourns.inc.  I'm a fan of the "lets define a whole family 
of parts" approach although there is really no reason why you have to do 
it in M4 vs awk, perl, ruby, or fortran.


-Dan