Root/atusb/README-PCB

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- ground via of the antenna: hole diameter is nominally 8 mil, but any size
8  <= 15 mil can be used
9- mechanical tolerances: <= +/- 0.1 mm on all sides
10- the holes for the positioning pins of the USB connector have a nominal
11  diameter of 1.15 mm. The minimum finished hole size must be 1.10 mm,
12  maximum 1.25 mm.
13
14
15Hole for the USB connector:
16
17The USB connector extends below (!) the surface of the PCB. For SMT, a
1816-17 mm hole must be left next to the PCB's edge:
19
20<-17mm->
21+------+-------------+
22| |- |
23| Hole | PCB |
24| |- |
25+------+-------------+
26
27For illustration:
28http://downloads.qi-hardware.com/people/werner/wpan/tmp/usb-off-board.jpg
29
30
31Layer stacking, from top to bottom:
32
33atusb-SilkS_Front.gto Front silk screen
34atusb-Mask_Front.gts Front solder mask
35atusb-Front.gtl Front copper
36atusb-Back.gbl Back copper
37atusb-Mask_Back.gbs Back solder mask
38
39
40Other design files:
41
42atusb-front.png Illustration of the PCB's front side
43atusb-back.png idem, for the back side
44atusb-PCB_Edges.gbr Board edges, for routing (Gerber)
45atusb.dxf idem (AutoCAD DXF)
46atusb.drl Excellon drill file
47atusb-SoldP_Front.gtp Front solder paste, for stencil
48
49
50Interpretation of files:
51
52- for all coordinates, the origin is the lower left corner of the board
53- do not print component values on silk screen
54- the center (!) of the board edge line marks the true board edge, e.g.,
55
56                             Edge line (5 mil)
57                        =======
58         ------- - - - - - ----------
59               | |
60   PCB outside | | PCB inside
61               | |
62         ------- - - - - - ----------
63                     |
64               Volume removed when cutting
65               (width depends on tool used)
66

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