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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
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@ -1,8 +1,8 @@
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Board characteristics:
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Board characteristics:
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- stacking: 2 layers, solder mask on front and back, silk screen on front
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- stacking: 2 layers, solder mask on front and back, silk screen on front
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- board material: FR4, thickness 0.8 mm, 1 oz copper
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- board material: FR4, thickness 0.8 mm (1/32"), 1 oz copper
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- surface finish: ENIG (preferred) or tin
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- surface finish: ENIG recommended
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- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used
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- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used
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- mechanical tolerances: <= +/- 0.1 mm on all sides
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- mechanical tolerances: <= +/- 0.1 mm on all sides
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@ -22,8 +22,7 @@ atben.drl Excellon drill file
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Interpretation of files:
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Interpretation of files:
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- do not print PCB edges on front/back copper
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- for all coordinates, the origin is the lower left corner of the board
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- do not print component values on silk screen
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- the center (!) of the board edge line marks the true board edge, e.g.,
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- the center (!) of the board edge line marks the true board edge, e.g.,
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Edge line (5 mil)
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Edge line (5 mil)
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@ -1,8 +1,8 @@
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Board characteristics:
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Board characteristics:
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- stacking: 2 layers, solder mask on front and back, silk screen on front
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- stacking: 2 layers, solder mask on front and back, silk screen on front
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- board material: FR4, thickness 0.8 mm, 1 oz copper
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- board material: FR4, thickness 0.8 mm (1/32"), 1 oz copper
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- surface finish: TBD, both ENIG and tin are acceptable
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- surface finish: TBD, ENIG is preferred
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- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used
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- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used
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- mechanical tolerances: <= +/- 0.1 mm on all sides
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- mechanical tolerances: <= +/- 0.1 mm on all sides
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@ -22,7 +22,7 @@ atusb.drl Excellon drill file
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Interpretation of files:
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Interpretation of files:
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- do not print PCB edges on front/back copper
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- for all coordinates, the origin is the lower left corner of the board
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- do not print component values on silk screen
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- do not print component values on silk screen
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- the center (!) of the board edge line marks the true board edge, e.g.,
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- the center (!) of the board edge line marks the true board edge, e.g.,
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