[PCB_FORUM] Re: Heatsink Pad

Thanks Dave,

Interesting, that is what I was looking for initially. (I am using 15.2) 

Regards,
Ed




Dave Elder <dave.elder@xxxxxxxxxx> 
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12/14/2005 02:31 PM
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[PCB_FORUM] Re: Heatsink Pad






Unless you are using 15.5 do not use PACKAGE GEOMETRY/PASTEMASK_TOP as the 
user-defined layer name.
In 15.5 this is a system-defined layer and you will get a nasty conflict 
if you already have a user-defined layer of this name in your designs or 
on symbols when you come to uprev your designs or use 15.x created symbols 
in 15.5.

Cheers, Dave



Gerry Meier wrote:
While in symbol - Add polygon  on Package Geometry > Pastemask_top then 
Include this layer in your film control file
 
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 10:09 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Heatsink Pad


Hi Gerry, 

That is the track I was originally on but I didn't see how to add the 
paste pad. 

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: 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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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> 
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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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