Re: gEDA-user: File Symbol Creation for an LQFP EP

[Dan McMahill <dan@xxxxxxxxxxxx>]

research@xxxxxxxxxxxxxx wrote:
> Hello,
> 
> I am rolling my own symbols for my components. Namely an analog devices
> sharc ADSP-21369 and altera FPGA. The footprint attribute for the chip
> is LQFP208 1102. However, the chip has an exposed pad in the bottom.
> According to the list
> 
> http://www.geda.seul.org/wiki/geda:scg#footprint_naming_conventions
> 
> There is no LQFPn x EP. How do I proceed?

it looks like almost everything you need is in place.

If you have a source tree for pcb, go into

lib/
and look at geda.inc.  Look around line 448 and you'll see the 
definition of a LQFP with exposed paddle.  If you search a handful of 
lines later, you'll also see a 208 pin QFP that is not exposed paddle. 
Basically all you do is copy the one line for either of those and adjust 
the parameters, rebuild the library, and you are done.

The 2 lines you probably want to add are:

define(`PKG_LQFP208_28', `PKG_LQFP_50(`$1',`$2',`$3',`208',`28',`0')');
define(`PKG_LQFP208_28_EP', `PKG_LQFP_50(`$1',`$2',`$3',`208',`28',`871')');


note that the `871' should be adjusted to be the correct size for the 
exposed paddle pad on the board.  871 is the size of the package paddle.


-Dan




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