Hi Jelle, On Wed, 2009-05-13 at 14:45 +0200, Jelle de Jong wrote: > Hello everybody, > > I am trying to create a footprint with a correct name using the IPC-7351 > Naming Convention for Standard SMT Land Patterns. > > But I am having some issues, i am using the below document to learn about > the naming convention: > https://secure.powercraft.nl/svn/openarm/trunk/working/pcb/documents/footprint-name-spec.pdf > > The footprint I want to make is a 54-pin TSOP II (400 mil), see: > https://secure.powercraft.nl/svn/openarm/trunk/doc/SDRAM/MT48LC16M16A2P-7E/256MSDRAM.pdf > # page 75, 54-Pin Plastic TSOP > > I tried to figure it out but I don't know what the lead span 1(L1) is? > > footprint: > TSSOP-65P-640L1-54N > 54-pin TSOP II (400 mil) > TSSOP pin spacing, lead span 1, pin count > P pin spacing dimension > L1 lead span 1 dimension > N pin count count > > I also learned to create footprints with the following document: > https://secure.powercraft.nl/svn/openarm/trunk/working/pcb/documents/land_patterns_20070818.pdf > I had my ups and downs learning this and had some help trough IRC. > > However the creation of a 54-pin TSOP II seems to be able to automate > using a script. > > I looked at the following, but it uses a license I disagree with and I > can't figure out how it works, I prefer OSI and GPL compatible licenses. > http://www.luciani.org/geda/pcb/pcb-perl-library.html > > Would somebody be able to help me out, what should the name of the > footprint become and what scripts can I use to make the footprint and how > can I do this? >
I would go for a name like: "TSSOP80P1176X120-54N.fp" as in the IPC standard IPC-7351 0.80 mm pitch, 11.76 mm lead span, X 1.20 mm height - 54 leads with Nominal pad conditions (as one of the following: Least, Nominal, Most). Maybe it is a wise thing to avoid "-" characters in footprint file names or to have a "use-files" line in your gsch2pcb config file and pass a --skip-m4 flag to disable m4 macro generated footprints to goof up your pcb stuff. Maybe include a vendor and part name too, while footprint artwork recommendations may vary across vendors and specific parts. Kind regards, Bert Timmerman. > Could somebody help me out by making an example for the 54-pin TSOP II > footprint? > > I got a lot more footprints to make, and I can use all the help, since > time is getting really sparse. > > OpenARM Single Board Computer Project: > https://secure.powercraft.nl/websvn/openarm/ > > Thanks in advance, > > Jelle de Jong > > > _______________________________________________ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user