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Subject: Re: [geda-user] DDPAK footprint?
From: Stefan Salewski <mail AT ssalewski DOT de>
To: geda-user AT delorie DOT com
Date: Mon, 31 Mar 2014 17:54:21 +0200
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On Mon, 2014-03-31 at 02:53 -0400, Dave McGuire wrote:
>   Hey folks!  Has anyone done a footprint for TI's DDPAK package, like
> the one used for the LM2673?


Do you need the rounded center pad?
If not, input data file like this

Device = Global
  author = "Stefan Salewski"
  email = "mail AT ssalewski DOT de"
  dist-license = GPL
  use-license = unlimited
  date = "31-MAR-2014"
  elementdir = "./"
  silkwidth = 10 mil
  silkoffset = 10 mil
  textpos = upperleft
  textorientation = horizontal
  refdessize = 100
  mask = 6 mil
  clearance = 10 mil
  p1silkmark = ""
  p1coppermark = "yes"

# Quad Flat Packages and similar SMD devices like SO, see http://en.wikipedia.org/wiki/QFP
Device = QFP
  defaultunit = mm
  name = "DDPAK" # name of the footprint -- if left empty then filename is used
  description = "" # detailed description
  desc = "DDPAK (LM2673)" # short description
  documentation = "http://www.ti.com/lit/gpn/lm2673" # source of layout, i.e. URI of datasheet
  pins = 7 # total number of pins
  rows = 7 # number of pins at side of pin one -- 0 is identical to pins/4
  width = 16.64 # separation of the two columns of pads -- center to center. If 0 height is used.
  height = 0 # separation of the two rows of pads -- center to center. If 0 width is used.
  pitch = 1.27 # distance between adjacent pads -- center to center
  padthickness = 0.91 # should be smaller than pitch
  padlength = 2.16
  centerpadwidth = 10.41 # width of additional center pad with number pins+1 -- use 0 to supress
  centerpadheight = 10.81 # height of additional center pad with number pins+1 -- use 0 to supress
  silkbox = "inner" # inner or outer for autosize, custom for explicit size, otherwise no box
  silkboxwidth = 0 mil # silkbox width, used if silkbox = custom, no box if value is too small
  silkboxheight = 0 mil # silkbox height, used if silkbox = custom, no box if value is too small
  ovalpads = "no" # to get ovals use: oval, ovalpads, yes, true, 1
  p1silkmark = "damage" # mark pin/pad 1: see global section, or for specific shape: circle, damage, slash
  Generate DDPAK.fp

gives this footprint:

Element["" "DDPAK (LM2673)" "DDPAK" "" 0 0 -32756 -30280 0 100 ""]
(
  Pad[-35217 -15000 -30295 -15000 3583 2000 4783 "1" "1" ""]
  Pad[-35217 -10000 -30295 -10000 3583 2000 4783 "2" "2" "square"]
  Pad[-35217 -5000 -30295 -5000 3583 2000 4783 "3" "3" "square"]
  Pad[-35217 0 -30295 0 3583 2000 4783 "4" "4" "square"]
  Pad[-35217 5000 -30295 5000 3583 2000 4783 "5" "5" "square"]
  Pad[-35217 10000 -30295 10000 3583 2000 4783 "6" "6" "square"]
  Pad[-35217 15000 -30295 15000 3583 2000 4783 "7" "7" "square"]
  Pad[0 -787 0 787 40984 2000 42184 "8" "8" "square"]
  ElementLine[-27004 -17801 -27004 22780 1000]
  ElementLine[-22026 -22780 27004 -22780 1000]
  ElementLine[-27004 -17801 -22026 -22780 1000]
  ElementLine[27004 22780 27004 -22780 1000]
  ElementLine[27004 22780 -27004 22780 1000]
  Attribute("name" "DDPAK")
  Attribute("author" "Stefan Salewski")
  Attribute("email" "mail AT ssalewski DOT de")
  Attribute("dist-license" "GPL")
  Attribute("use-license" "unlimited")
  Attribute("date" "31-MAR-2014")
  Attribute("desc" "DDPAK (LM2673)")
  Attribute("documentation" "http://www.ti.com/lit/gpn/lm2673")
)