IEEE 802.15.4 subsystem
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IEEE 802.15.4 subsystem Commit Details
Date: | 2011-03-22 16:26:46 (13 years 6 days ago) |
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Author: | Werner Almesberger |
Commit: | 3a80f068ba047441b9521f0e4df6778ee48d7736 |
Message: | 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 |
Files: |
modules/INFO (1 diff) modules/qfn.fpd (1 diff) |
Change Details
modules/INFO | ||
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24 | 24 | # http://www.nxp.com/package/SOT617-1.html |
25 | 25 | # http://www.nxp.com/package/SOT617-3.html |
26 | 26 | # |
27 | # Solder paste: | |
28 | # | |
29 | # Footprint Center pad Closest NXP (with complete land pattern) | |
30 | # QFN28-Atmel 2.4 mm for further study | |
31 | # QFN28-SiLabs 3.3 mm use SiLab's specification | |
32 | # QFN32-VHHD-2 3.7 mm between SOT818-1 and SOT788-1 | |
33 | # QFN32-VHHD-6 3.4 mm SOT818-1 | |
34 | # | |
35 | # From NXP: | |
36 | # | |
37 | # Package Pad Paste zone Islands Isl. size Isl. gap | |
38 | # SiLabs 3.25 3.1 3 x 3 0.9 | |
39 | # SOT818-1 3.4 1.75 2 x 2 0.75 0.25 | |
40 | # SOT788-1 4.0 2.4 3 x 3 0.6 0.3 | |
41 | # | |
42 | # NXP rules (AN10365): | |
43 | # - paste zone = 35% of pad area | |
44 | # - paste coverge = 20% of pad area | |
45 | # | |
46 | # Our parameters: | |
47 | # | |
48 | # Package Pad Paste zone Islands Isl. size Isl. gap Zone Coverage | |
49 | # QFN32-VHHD-2 3.7 2.15 3 x 3 0.5 0.25 34% 20% | |
50 | # QFN32-VHHD-6 3.4 1.95 2 x 2 0.75 0.45 33% 19% | |
51 | # | |
27 | 52 | # Known bugs: |
28 | 53 | # |
29 | # - we should distribute the solder paste in an array of small | |
30 | # squares instead of just covering the whole center pad. | |
31 | 54 | # - really ought to merge all the various QFN definitions (we have more |
32 | 55 | # over at gta02-core) into a single QFN file with a big mean table of |
33 | 56 | # everything |
modules/qfn.fpd | ||
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105 | 105 | { pins, variant, X1, Y1, X2, Y2, E, C1, C2, SE, SNX, SNY, SX, SY } |
106 | 106 | { 28, "Atmel", 0.24mm, 0.7mm, 2.4mm, 2.4mm, 0.45mm, 4.1mm, 4.1mm, 1mm, 2, 2, 0.8mm, 0.8mm } |
107 | 107 | { 28, "SiLabs", 0.25mm, 0.9mm, 3.3mm, 3.3mm, 0.5mm, 4.8mm, 4.8mm, 1.1mm, 3, 3, 0.9mm, 0.9mm } |
108 | { 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 } | |
109 | { 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 } | |
108 | { 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 } | |
109 | { 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 } | |
110 | 110 | |
111 | 111 | set w = 5mil |
112 | 112 |