Date:2011-03-15 01:31:55 (8 years 8 months ago)
Author:Werner Almesberger
Commit:eac6e3c70ba7b87fe07e3d7c88459d610bc7c76d
Message:atben/README-PCB, atusb/README-PCB: various minor clarifications

- README-PCB: added imperial units for board thickness
- README-PCB: changed surface finish recommendation to prefer ENIG more
strongly
- README-PCB: removed instructions for Gerber file generation from
"interpretation of files section"
- README-PCB: mention common coordinate system origin
Files: atben/README-PCB (2 diffs)
atusb/README-PCB (2 diffs)

Change Details

atben/README-PCB
11Board characteristics:
22
33- stacking: 2 layers, solder mask on front and back, silk screen on front
4- board material: FR4, thickness 0.8 mm, 1 oz copper
5- surface finish: ENIG (preferred) or tin
4- board material: FR4, thickness 0.8 mm (1/32"), 1 oz copper
5- surface finish: ENIG recommended
66- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used
77- mechanical tolerances: <= +/- 0.1 mm on all sides
88
...... 
2222
2323Interpretation of files:
2424
25- do not print PCB edges on front/back copper
26- do not print component values on silk screen
25- for all coordinates, the origin is the lower left corner of the board
2726- the center (!) of the board edge line marks the true board edge, e.g.,
2827
2928                             Edge line (5 mil)
atusb/README-PCB
11Board characteristics:
22
33- stacking: 2 layers, solder mask on front and back, silk screen on front
4- board material: FR4, thickness 0.8 mm, 1 oz copper
5- surface finish: TBD, both ENIG and tin are acceptable
4- board material: FR4, thickness 0.8 mm (1/32"), 1 oz copper
5- surface finish: TBD, ENIG is preferred
66- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used
77- mechanical tolerances: <= +/- 0.1 mm on all sides
88
...... 
2222
2323Interpretation of files:
2424
25- do not print PCB edges on front/back copper
25- for all coordinates, the origin is the lower left corner of the board
2626- do not print component values on silk screen
2727- the center (!) of the board edge line marks the true board edge, e.g.,
2828

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