mirror of
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92 lines
2.7 KiB
Plaintext
92 lines
2.7 KiB
Plaintext
#
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# Tags:
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#
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# F Footprint name (must be first)
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# N Data sheet identifier (N tag of BOOKSHELF; can be omitted if equal to F)
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#
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# Standard rectangular passive components
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F: stdpass
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# Solder pads and test points
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F: pads
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# Printed 8:10 card contacs
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F: 8_10-card
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# Fiducial (1 mm copper pad, 2 mm solder mask clearance)
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F: fiducial
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# "Generic" simple QFN
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F: qfn
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#
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# The information for these packages comes from various sources:
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#
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# - the C8051F326 data sheet, for the QFN28 footprint (N: mcu)
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# - the AT86F326 data sheet, for the QFN32 package dimensions (N: txrx)
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# - Atmel's general recommendations for QFN land patterns (N: atmel-qfn)
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# - NXP's SOT617-1 and SOT617-3, for package and land pattern:
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# http://www.nxp.com/package/SOT617-1.html
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# http://www.nxp.com/package/SOT617-3.html
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#
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# Solder paste:
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#
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# Footprint Center pad Closest NXP (with complete land pattern)
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# QFN28-Atmel 2.4 mm for further study
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# QFN28-SiLabs 3.3 mm use SiLab's specification
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# QFN32-VHHD-2 3.7 mm between SOT818-1 and SOT788-1
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# QFN32-VHHD-6 3.4 mm SOT818-1
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#
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# From NXP:
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#
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# Package Pad Paste zone Islands Isl. size Isl. gap
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# SiLabs 3.25 3.1 3 x 3 0.9
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# SOT818-1 3.4 1.75 2 x 2 0.75 0.25
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# SOT788-1 4.0 2.4 3 x 3 0.6 0.3
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#
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# NXP rules (AN10365):
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# - paste zone = 35% of pad area
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# - paste coverge = 20% of pad area
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#
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# Our parameters:
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#
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# Package Pad Paste zone Islands Isl. size Isl. gap Zone Coverage
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# QFN32-VHHD-2 3.7 2.15 3 x 3 0.55 0.25 34% 20%
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# QFN32-VHHD-6 3.4 1.95 2 x 2 0.75 0.45 33% 19%
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#
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# Known bugs:
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#
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# - really ought to merge all the various QFN definitions (we have more
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# over at gta02-core) into a single QFN file with a big mean table of
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# everything
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#
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N: sot617-3-lp
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# "Generic" simple QFP (for now, just for Silabs' C8051F320)
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F: qfp
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# Mini-USB B receptable (SMT; almost generic)
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F: mini_usb_b
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# USB A plug for SMT
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#
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# Note: the signal pads are enlarged by 0.2 mm and their center is shifted by
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# 0.1 mm with respect to the reference.
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#
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# According to the data sheet, the leads terminate at (2.00+/-0.10 mm)/2+
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# 2.48 mm = 3.48+/-0.10 mm from the center. The reference footprint puts the
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# edge of the pads at (2.00+/-0.10 mm)/2+2.6 mm = 3.6 mm+/-0.10 mm, so the
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# maximum lead end could be at 3.58 mm while the minimum pad edge could be at
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# 3.5 mm.
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#
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# Assuming that the pad is intended to extend a bit beyond the lead, we need
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# to add 0.2 mm to compensate for these tolerances. (The pad tolerance may not
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# be intended to be used this way, however, we still have to consider small
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# errors in registration, which also amount to about 0.1 mm, so the calculation
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# remains valid.)
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#
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F: usb_a_plug_smt
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# USB 2.0 from usb_20_040908, page 99
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F: usb-a-pcb
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