Sometimes footprints are created by modifications of other footprints
and some users may forget about editing of some footprint properties.
1. Doc - it should be at least prohibited to leave there misleading
informations.
2. Keywords - requirements of library file format should be reminded
(lowercase, separated by space -
http://www.compuphase.com/electronics/LibraryFileFormats.pdf)
3. and 4. Reference and Value - user manual says "Before saving, it is
also recommended to change the reference or value of the module to be
equal to
the library name of the module."
5. (!) Attributes - I think it's important to remind in KLC about
setting proper attributes.
6. 7. 8. Move and Place, Auto Place, Local Clearance Values - the rule
may be: keep default (Move and Place: Free; Auto Place: 0 and 0, Local
Clearance Values: 0)
9. 3D Shape Names - at the moment there are no rules about 3D
11. Text line width - it's easy to forget about applying rule 6.5 to
text fields
12. Text size - I'm not sure but it seems that default is 1 mm so it
would be easiest to define as 6. 7. 8.
The most important are Doc, Keywords and Attributes because they can't
be repaired automatically.
W dniu 12.01.2015 o 23:44, Carl Poirier pisze:
Hi Michal,
Thanks for your comments. My apologies for not seeing your email at first.
3 to 8 can be summarized with "using defaults values for footprint
properties". My goal is to keep the KLC as simple as possible so any
contributor can quickly understand it. 11 is redundant with 6.5 and 12
is debatable. In /PCB Design Optimization Starts in the CAD Library/,
they mention the nominal height is 1.2mm. I'd go with that.
Carl
On Mon, Jan 12, 2015 at 5:05 PM, nnn <[email protected]
<mailto:[email protected]>> wrote:
I forgot:
11. Line width is 0.15 mm also for value and reference (because
it's on silkscreen).
12. Text size 1 mm (or more? smaller looks bad).
Maybe not all these rules should be in KLC, but I think that some
of them are important (eg setting proper attributes).
Michał Stec
W dniu 04.01.2015 o 20:22, nnn pisze:
Library convention doesn't inform how Footprint Properties
should be filled. I think it would be good to add some rules
to avoid mess.
My proposition is:
1. Doc
Some information that will allow to identify footprint
should be provided, eg manufacturer, manufacturers name,
datasheet file name. Link to datasheet is not enough because
it can be broken in future.
2. Keywords
Don't use misleading Keywords. Keywords separated with
space character.
3. Reference
Reference should be default (the same as footprint name).
4. Value
Default: VAL**
5. Attributes
Follow recommendations from user manual.
6. Move and Place
Default: Free.
7. Auto Place
0 and 0 (recommendation from user manual).
8. Local Clearance Values
Default: 0 (if there is no reason to change it).
9. 3D Shape Names
Relative path with KISYS3DMOD set to ...
/kicad-library/modules/packages3d, path is:
LIBRARY_NAME/FOOTPRINT_NAME.wrl
What do you think about it?
Michał Stec
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