Root/atusb/README-PCB

Source at commit 2e5329039c2a4c9d131be003d3db703a938cfdfb created 13 years 6 days ago.
By Werner Almesberger, include overview images in PCB and SMT fab packages
1Board characteristics:
2
3- stacking: 2 layers, solder mask on front and back, silk screen on front
4- board material: FR4, thickness 0.8 mm (1/32"), 1 oz copper
5- surface finish: TBD, ENIG is preferred
6- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used
7- mechanical tolerances: <= +/- 0.1 mm on all sides
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10Layer stacking, from top to bottom:
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12atusb-SilkS_Front.gto Front silk screen
13atusb-Mask_Front.gts Front solder mask
14atusb-Front.gtl Front copper
15atusb-Back.gbl Back copper
16atusb-Mask_Back.gbs Back solder mask
17
18
19Other design files:
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21atusb-front.png Illustration of the PCB's front side (without holes)
22atusb-back.png idem, for the back side
23atusb-PCB_Edges.gbr Board edges, for routing (Gerber)
24atusb.dxf idem (AutoCAD DXF)
25atusb.drl Excellon drill file
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27
28Interpretation of files:
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30- for all coordinates, the origin is the lower left corner of the board
31- do not print component values on silk screen
32- the center (!) of the board edge line marks the true board edge, e.g.,
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34                             Edge line (5 mil)
35                        =======
36         ------- - - - - - ----------
37               | |
38   PCB outside | | PCB inside
39               | |
40         ------- - - - - - ----------
41                     |
42               Volume removed when cutting
43               (width depends on tool used)
44

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