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increased solder paste deposits in QFN32-VHHD-2 and QFN32-VHHD-6
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
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modules/INFO
27
modules/INFO
@ -24,10 +24,33 @@ F: qfn
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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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# - we should distribute the solder paste in an array of small
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# squares instead of just covering the whole center pad.
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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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@ -105,8 +105,8 @@ table
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{ pins, variant, X1, Y1, X2, Y2, E, C1, C2, SE, SNX, SNY, SX, SY }
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{ 28, "Atmel", 0.24mm, 0.7mm, 2.4mm, 2.4mm, 0.45mm, 4.1mm, 4.1mm, 1mm, 2, 2, 0.8mm, 0.8mm }
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{ 28, "SiLabs", 0.25mm, 0.9mm, 3.3mm, 3.3mm, 0.5mm, 4.8mm, 4.8mm, 1.1mm, 3, 3, 0.9mm, 0.9mm }
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{ 32, "VHHD-2", 0.26mm, 0.69mm, 3.7mm, 3.7mm, 0.5mm, 5.1mm, 5.1mm, 0.8mm, 3, 3, 0.5mm, 0.5mm }
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{ 32, "VHHD-6", 0.26mm, 0.69mm, 3.4mm, 3.4mm, 0.5mm, 5.1mm, 5.1mm, 1.2mm, 2, 2, 0.7mm, 0.7mm }
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{ 32, "VHHD-2", 0.26mm, 0.69mm, 3.7mm, 3.7mm, 0.5mm, 5.1mm, 5.1mm, 0.8mm, 3, 3, 0.55mm, 0.55mm }
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{ 32, "VHHD-6", 0.26mm, 0.69mm, 3.4mm, 3.4mm, 0.5mm, 5.1mm, 5.1mm, 1.2mm, 2, 2, 0.75mm, 0.75mm }
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set w = 5mil
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