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ben-wpan/atusb/README-PCB
Werner Almesberger f4342f49ae atusb: enlarged USB positioning pin hole; general cleanup
- modules/usb_a_plug_smt.fpd: enlarged hole for positioning pins from
  1.1 mm to 1.15 mm
- atusb/usb.sch, atusb/atusb.cmp, atusb/atusb.brd: removed trailing space
  from CON1's value
- atusb/atusb.sch, atusb/usb.sch, atusb/atrf.sch: schematics title still
  said AT86RF230, not 231
- atusb/README-SMT: corrected a typo
- atusb/README-PCB: specified the tolerance of the hole for the positioning
  pins of the USB connector
- atusb/README-PCB: added the 16-17 mm hole for the USB connector to the
  specification
- atusb/: bumped all version numbers to 20110330
2011-03-31 03:27:11 -03:00

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Board characteristics:
- stacking: 2 layers, solder mask on front and back, silk screen on front
- board material: FR4, thickness 0.8 mm (1/32"), 1 oz copper
- surface finish: TBD, ENIG is preferred
- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used
- ground via of the antenna: hole diameter is nominally 8 mil, but any size
<= 15 mil can be used
- mechanical tolerances: <= +/- 0.1 mm on all sides
- the holes for the positioning pins of the USB connector have a nominal
diameter of 1.15 mm. The minimum finished hole size must be 1.10 mm,
maximum 1.25 mm.
Hole for the USB connector:
The USB connector extends below (!) the surface of the PCB. For SMT, a
16-17 mm hole must be left next to the PCB's edge:
<-17mm->
+------+-------------+
| |- |
| Hole | PCB |
| |- |
+------+-------------+
For illustration:
http://downloads.qi-hardware.com/people/werner/wpan/tmp/usb-off-board.jpg
Layer stacking, from top to bottom:
atusb-SilkS_Front.gto Front silk screen
atusb-Mask_Front.gts Front solder mask
atusb-Front.gtl Front copper
atusb-Back.gbl Back copper
atusb-Mask_Back.gbs Back solder mask
Other design files:
atusb-front.png Illustration of the PCB's front side
atusb-back.png idem, for the back side
atusb-PCB_Edges.gbr Board edges, for routing (Gerber)
atusb.dxf idem (AutoCAD DXF)
atusb.drl Excellon drill file
atusb-SoldP_Front.gtp Front solder paste, for stencil
Interpretation of files:
- for all coordinates, the origin is the lower left corner of the board
- do not print component values on silk screen
- the center (!) of the board edge line marks the true board edge, e.g.,
Edge line (5 mil)
=======
------- - - - - - ----------
| |
PCB outside | | PCB inside
| |
------- - - - - - ----------
|
Volume removed when cutting
(width depends on tool used)