Besides what Ian has suggested, one simpler (in my mind) alternative is
to use the footprint instead of a Pad Class for that clearance rule. Since your
fiducial will have a unique name and you would want the same polygon spacing on
all fiducials.
Another refinement to consider, make your polygon clearance around the
fiducial just slightly wider than the soldermask clearance around the fiducial,
that way you are not exposing bare copper if the soldermask opening is not
perfectly aligned during fabrication.
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
#14 - 1925 Kirschner Road,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2232 ext. 225
fax (250) 762-3374
-----Original Message-----
From: Ian Rozowsky [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 21, 2007 9:25 PM
To: 'Protel EDA Discussion List'
Subject: Re: [PEDA] fiducials
Create a Pad Class for the fiducials, and then a Clearance Rule between
that Pad Class and Polygons.
Ian Rozowsky
R&D Director
Centurion Systems (Pty) Ltd.
Box 506 Cramerview 2060 Gauteng South Africa
+27-11-699-2434
http://www.centsys.co.za
Cerno et Prodo!
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of john bougs
Sent: 22 March 2007 06:30
To: 'Protel EDA Discussion List'
Subject: [PEDA] fiducials
I have been trying to create fiducials on my design (both local and
global)
I have been creating them by creating a pad, on the top layer:
diameter = 1mm
hole size = 0mil
solder mask expansion = .5mm
paste mask expeansion = -1mm
This creates a nice fiducial, but the polygon ground plane get too
close to it (using the default cleance rules). If I use the keepout
layer, I can route on any of the layers.
Any suggestions would be appreciated.
---------------------------------
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(and love to hate): Yahoo! TV's Guilty Pleasures list.
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