kicad-libs/modules/INFO

#
# Tags:
#
# F     Footprint name (must be first)
# N     Data sheet identifier (N tag of BOOKSHELF; can be omitted if equal to F)
#

# Standard rectangular passive components
F: stdpass

# Solder pads and test points
F: pads

# Printed 8:10 card contacs
F: 8_10-card

# Fiducial (1 mm copper pad, 2 mm solder mask clearance)
F: fiducial

# "Generic" simple QFN
F: qfn
#
# The information for these packages comes from various sources:
#
# - the C8051F326 data sheet, for the QFN28 footprint (N: mcu)
# - the AT86F326 data sheet, for the QFN32 package dimensions (N: txrx)
# - Atmel's general recommendations for QFN land patterns (N: atmel-qfn)
# - NXP's SOT617-1 and SOT617-3, for package and land pattern:
#   http://www.nxp.com/package/SOT617-1.html
#   http://www.nxp.com/package/SOT617-3.html
#
# Solder paste:
#
# Footprint    Center pad  Closest NXP (with complete land pattern)
# QFN28-Atmel  2.4 mm	   for further study
# QFN28-SiLabs 3.3 mm	   use SiLab's specification
# QFN32-VHHD-2 3.7 mm	   between SOT818-1 and SOT788-1
# QFN32-VHHD-6 3.4 mm	   SOT818-1
#
# From NXP:
#
# Package   Pad  Paste zone  Islands  Isl. size  Isl. gap
# SiLabs    3.25 3.1	     3 x 3    0.9	 
# SOT818-1  3.4  1.75	     2 x 2    0.75	 0.25
# SOT788-1  4.0  2.4	     3 x 3    0.6	 0.3
#
# NXP rules (AN10365):
# - paste zone = 35% of pad area
# - paste coverge = 20% of pad area
#
# Our parameters:
#
# Package       Pad  Paste zone  Islands  Isl. size  Isl. gap  Zone  Coverage
# QFN32-VHHD-2  3.7  2.15	 3 x 3	  0.55	     0.25      34%   20%
# QFN32-VHHD-6  3.4  1.95	 2 x 2	  0.75	     0.45      33%   19%
#
# Known bugs:
#
# - really ought to merge all the various QFN definitions (we have more
#   over at gta02-core) into a single QFN file with a big mean table of
#   everything
#
N: sot617-3-lp

# "Generic" simple QFP (for now, just for Silabs' C8051F320)
F: qfp

# Mini-USB B receptable (SMT; almost generic)
F: mini_usb_b

# USB A plug for SMT
#
# Note: the signal pads are enlarged by 0.2 mm and their center is shifted by
# 0.1 mm with respect to the reference.
#
# According to the data sheet, the leads terminate at (2.00+/-0.10 mm)/2+
# 2.48 mm = 3.48+/-0.10 mm from the center. The reference footprint puts the
# edge of the pads at (2.00+/-0.10 mm)/2+2.6 mm = 3.6 mm+/-0.10 mm, so the
# maximum lead end could be at 3.58 mm while the minimum pad edge could be at
# 3.5 mm.
#
# Assuming that the pad is intended to extend a bit beyond the lead, we need
# to add 0.2 mm to compensate for these tolerances. (The pad tolerance may not
# be intended to be used this way, however, we still have to consider small
# errors in registration, which also amount to about 0.1 mm, so the calculation
# remains valid.)
#
F: usb_a_plug_smt

# USB 2.0 from usb_20_040908, page 99
F: usb-a-pcb

# SOT-323 package with counter-clockweise or clockwise pin assignment
F: sot-323
N: mmst3904

# http://www.nxp.com/#/page/content=[f=/packages/SOT341-1.xml]
F: ssop