Good Day All,
I've been on the sidelines of this one since I haven't had time
to try it out. I get the same behavior as Nukien and others. Drop a via
on a GND plane polygon and it indeed is isolated. However, Dennis's
comment on heat sinks stood out, because I've used vias to connect a
device with a heat sink down to the PCB bottom layer and connected it a
polygon plane. Unfortunately, the vias are part of the component
footprint. This seems to allow them to connect to the plane.
Something seems curious to me. Vias don't have a pad designator
associated with them. I'm thinking that is the underlying reason the
polygons don't connect.
Therefore, it seems the only way to get them to connect is to
use free pads or to convert any vias to free pads if you want to connect
them to the polygon.
Dan Enslen
The only reason time exists is so
everything doesn't happen all at once.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Nukien
Sent: Wednesday, March 09, 2005 9:40 PM
To: Protel EDA Discussion List
Subject: Re: [PEDA] Weird - via won't join GND polygons
It's only a 2 layer board. I checked the vias - they go from TopLayer
to
BottomLayer.
Dennis - why do you think the polys should pull back from the vias ? I
would think that dropping vias to connect planes like that is fairly
common.
I see it in SMPS designs a lot - plop a bunch of vias around to ensure
current and heat transfer.
Surely I'm not the first to try this ...
--
Dean Carpenter
deano at areyes com
94TT :)
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