[PCB_FORUM] Re: Heatsink Pad

Ideally it should be possible to create shape symbols for mask, pad and paste 
and then use pad designer to create a padstack
using these shape symbols.
 
Unfortunately there is an innate rule built in that prohibits saving a shape 
symbol that consists of more than 1 shape. Andrew
has one method that will work, but would be nice if the tools would be a bit 
more flexible. Another way would be to add
mechanical pads with paste apertures within your original heatsink pad while 
within symbol edit.
 
That said, it probably is one of the most flexible platforms. Just wish that 
some of the silly rules would disappear.
For example, why does zcopy not work with lines and text, why not make it work 
with anything? Why not make the full suit of edit
and shape commands work within all drawing types?
 
Best Regards
 
David Greig
______________________________
GigaDyne Ltd
Buchan House
Carnegie Campus
Dunfermline KY11 8PL
United Kingdom
t: +44 (0)1383 624 975
www.gigadyne.co.uk <http://www.gigadyne.co.uk/> 
______________________________
 

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From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: 14 December 2005 17:35
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Heatsink Pad



Thanks Andrew, 

Is this the only way? 
Seems a little strange to be adding layers. 
Is there a back door to the existing sub class Pin - Pastemask_Top? 

Ed 




"Andrew Noonan (annoonan)" <annoonan@xxxxxxxxx> 
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12/14/2005 12:27 PM 


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[PCB_FORUM] Re: Heatsink Pad

        




Ed, 
You would need to create a new subclass within the symbol, say, in 
Package_Geometry/Paste_Top, and put the geometry there. 
It will come into your design when the symbol is placed. The catch is, you need 
to add this subclass to your artwork control
manually. If you don't put it there, it won't be output. 
  
Andrew 


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From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: Wednesday, December 14, 2005 9:24 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Heatsink Pad


Gerry, 

How do I add a solder paste pad to a symbol independent of the padstack editor? 

Thanks,
Ed 



"Gerry Meier" <gerry.meier@xxxxxxxxxxxxxx> 
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12/14/2005 11:03 AM 



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[PCB_FORUM] Re: Heatsink Pad


        





Ed, 
 
 
You can just add the shape to the symbol on etch > top. When you import the 
part into you're board file assign the shape to
whatever net you want and drop in some vias. You can include the soldrmask and 
pastemask in the symbol. 
 
This does not require a ninth pin to be added to the logic symbol. 
 
 
Gerry Meier 
Sr. PCB Designer 
Freedom CAD Services, Inc. 
Voice: (603) 864-1300 x1350 
AL Voice: (256) 417-6944 
Email:  <mailto:gerry.meier@xxxxxxxxxxxxxx> gerry.meier@xxxxxxxxxxxxxx 
visit our website at<http://www.freedomcad.com 
 


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From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: Wednesday, December 14, 2005 9:52 AM
To: Milostnik Matija ITWEH7
Cc: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Heatsink Pad


Sorry - didn't mean to seem unfriendly 

First, I generated the unique pad shape with the Allegro editor... 

Start new 
enter a unique file name 
select drawing type - Shape symbol 
in the editor - go to Shape add polygon 
draw the shape 
save (Important - make sure the Setup Drawing Parameters is set to Type: Shape) 

Open padstack editor 
go to layers tab 
select each appropriate layer and change the geometry to shape (under Regular 
Pad) 
pick the nav button beside Shape and find the unique file name you assigned to 
the pad shape 

This still leaves a problem in my symbol. It has 8 pins and the heatsink adds a 
9th pin. This means I have to add another pin to
the schematic symbol in order to tie the heatsink to the appropriate same net 
pins. 

Hope this helps 

Ed 


"Milostnik Matija    ITWEH7" <milostnik@xxxxxxxxxxx> 


12/14/2005 10:21 AM 




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RE: [PCB_FORUM] Re: Heatsink Pad




        






Hello, 

very unfriendly from you, not to tell HOW did you figure it out. 

It is nice that you found a solution, but it would be even nicer, if you just 
would tell something like this: 
============================== 
never mind - figured it out by pushing on the third button from the left on the 
opening page. 
Ed 
============================== 

Bye 
Matija 




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From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: Wednesday, December 14, 2005 3:58 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Heatsink Pad


never mind - figured it out 
Ed 
Ed Caldwell <Ed.Caldwell@xxxxxxxxxx> 
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How do I generate a polygon Heatsink solderpaste pad? The symbol editor 
accommodates copper and soldermask but no solderpaste.
Is this done with a custom padstack? If so, how do I generate the polygon 
padshape so that I can import it into the padstack
editor? 

Thanks,
Ed 

Ed Caldwell
Circuit Board Designer
Voice: 770-622-8707
Email: mailto:ed.caldwell@xxxxxxxxxx

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