Re: gEDA-user: TQFP footprint questions

[Dan McMahill <dan@xxxxxxxxxxxx>]

Rob Butts wrote:
>    I'm trying to create a footprint for a Microchip signal controller.
>    I'm having trouble locating the horizontal pins with respect to the
>    vertical pins.  The datasheet gives dimensions for chip width and
>    height, pinwidth and pin pitch.  It doesn't give the distance from
>    chip edge to were the first pin from the edge.
>    Am I right in thinking I should multiply the pin width by the number
>    of pins on that side, then add to that the sum of space between each
>    pin (which I see as the pitch minus the pin width), subtract that
>    total from the chip length on that side and divide that value by 2 to
>    get the space from the chip edge to the first from the edge.
>    I was going to attach the datasheet but it is too large.
>    Thanks so much,
>    Rob
> 

are the TQFP footprints that come with PCB not suitable?

-Dan



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