[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: gerry.meier@xxxxxxxxxxxxxx
visit our website at<http://www.freedomcad.com
 

________________________________

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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<Ed.Caldwell@xxxxxxxxxx> 
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Subject
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 
  
  


________________________________

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> 
Sent by: icu-pcb-forum-bounce@xxxxxxxxxxxxx 

12/14/2005 09:11 AM 

Please respond to
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[PCB_FORUM] Heatsink Pad


        






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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