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3a80f068ba
Note that QFN28-Atmel and QFN28-SiLabs still need verifying. QFN28-SiLabs is quite differnt from NXP's specification. - modules/INFO: added description of solder paste deposit dimensioning rules (based on NXP's AN10365) - modules/qfn.fpd (QFN32-VHHD-2, QFN32-VHHD-6): increased solder paste deposits according to the rules
117 lines
3.3 KiB
Plaintext
117 lines
3.3 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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# TI meandered inverted F antenna
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F: meander
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N: AN043
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# Mini-USB B receptable (SMT; almost generic)
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F: mini_usb_b
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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 0.5 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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# Common 4-pin crystal SMT package (pins 1 and 4 are on a short side, pin
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# numbering is counter-clockwise)
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F: xtal-4
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N: nx3225sa
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# 0805 package with six pads
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F: 0805-6
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#
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# MMCX board-edge (SMT) female jack
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#
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# Design based on Molex 73415-0961, This is also compatible with:
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#
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# Tyco 1408152-1
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# Emerson 135-3711-801
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# Molex 73415-1261
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# Amphenol 262107
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#
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# Note: footprint changes with PCB thickness !
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#
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# Known bugs:
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# - keepout area marker should be on comment layer
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# - pin 2 should be off-center and extend such that proper trace can be
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# connected directly
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#
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F: mmcx-f-edge
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N: 73415-0961
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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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# SOT-323 package with counter-clockweise or clockwise pin assignment
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F: sot-323
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N: mmst3904
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# U.FL/Micro Coax/... receptacle
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F: u-fl-receptacle
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N: u.fl-receptacle
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