X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=gmail.com; s=20120113;
	h=message-id:date:from:user-agent:mime-version:to:subject:references
	:in-reply-to:content-type:content-transfer-encoding;
	bh=dEDVBEepfXl7+cwxg4xLAr851HF9+VoeKmqlcYbyaDc=;
	b=vRRT0Hnh/ft7cfRutLPpNzkPnovJ9oETmB+pUedYYLVmakg0E+YZUeDHz4t5Qu2gP5
	C8pSko9hwZO22Osmha+jI6/E9eDhVHkMQGB+QTBdT+QidjXz16RYpZsRKQhLpdsVwv66
	A4Z50XVLRJpRnRTCppBhY4CWKDI0cI/9FnuS4r/4bhGrXmKC1/upS1HGttnyCiyYzd5p
	ashtsKHXxfGgb3GsmOcs6MtOUI5V7tH3MoM6fGPJVmIkCn5ZzSb+/qlM/skZXgI3n1qi
	xLF0fVl6E93B0E7JBvwJSazC3eUpawNH4bfInMWSyFiIcNKgvNqEMbuIPK/T/E1tgN6d
	Va+g==
X-Received:	by 10.15.107.135 with SMTP id cb7mr358884eeb.60.1380955748251;
	Fri, 04 Oct 2013 23:49:08 -0700 (PDT)
Message-ID:	<524FB65F.9050604@gmail.com>
Date:	Sat, 05 Oct 2013 08:49:03 +0200
From:	onetmt <onetmt AT gmail DOT com>
User-Agent:	Mozilla/5.0 (X11; Linux i686; rv:10.0.12) Gecko/20130116 Icedove/10.0.12
MIME-Version:	1.0
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] polygons, arcs and footprints
References:	<CAM2RGhTKEi4GFb3_sYV8FJRfqr0GTzWfpk28vQ-bDLoQpjvXyQ AT mail DOT gmail DOT com>
In-Reply-To:	<CAM2RGhTKEi4GFb3_sYV8FJRfqr0GTzWfpk28vQ-bDLoQpjvXyQ@mail.gmail.com>
Reply-To:	geda-user AT delorie DOT com

Il 04/10/2013 23:56, Evan Foss ha scritto:
> Hi folks,
> 
> I am trying to make a footprint for an LTC3441. The bottom pad is a
> polygon. I know they are not possible in PCB footprints but does
> anyone have a good way to emulation one?

For other components - for instance the BSC159 mosfet by Infineon - I
used several square pads partially overlapped, in order to get the right
"polygonal" pad. But in your case, imho, you should use a "normal"
footprint and then design the polygons on layer, placing vias also on
central powerpad as indicated in datasheet.

> 
> Also I am trying to use a MEMS microphone that uses a ring to seal it
> to the PCB. Again I know that does not exist but is there a way around
> it?

It's difficult to say without knowing the component, but you can obtain
a ring - well, a sort of - by using appropriate clearance around an
"octagon" pad and placing a rectangle, maybe on a ground layer, around it.

> 
> -Evan
> 


-- 
Hofstadter's Law:
"It always takes longer than you expect, even when you take into account
Hofstadter's Law."

- Raw text -