Root/atusb/README-PCB

Source at commit eac6e3c70ba7b87fe07e3d7c88459d610bc7c76d created 8 years 8 months ago.
By Werner Almesberger, atben/README-PCB, atusb/README-PCB: various minor clarifications
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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9Layer stacking, from top to bottom:
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11atusb-SilkS_Front.gto Front silk screen
12atusb-Mask_Front.gts Front solder mask
13atusb-Front.gtl Front copper
14atusb-Back.gbl Back copper
15atusb-Mask_Back.gbs Back solder mask (empty)
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17Other design files:
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19atusb-PCB_Edges.gbr Board edges, for routing (Gerber)
20atusb.dxf idem (AutoCAD DXF)
21atusb.drl Excellon drill file
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23Interpretation of files:
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25- for all coordinates, the origin is the lower left corner of the board
26- do not print component values on silk screen
27- the center (!) of the board edge line marks the true board edge, e.g.,
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29                             Edge line (5 mil)
30                        =======
31         ------- - - - - - ----------
32               | |
33   PCB outside | | PCB inside
34               | |
35         ------- - - - - - ----------
36                     |
37               Volume removed when cutting
38               (width depends on tool used)
39

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