From 021ccdec93310433107897e767da7afb58f03b00 Mon Sep 17 00:00:00 2001 From: Werner Almesberger Date: Fri, 11 Mar 2011 16:16:50 -0300 Subject: [PATCH] atben/README-PCB: added manufacturing specification/instructions (in progress) --- atben/README-PCB | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 atben/README-PCB diff --git a/atben/README-PCB b/atben/README-PCB new file mode 100644 index 0000000..12eecbd --- /dev/null +++ b/atben/README-PCB @@ -0,0 +1,38 @@ +Board characteristics: + +- stacking: 2 layers, solder mask on front and back, silk screen on front +- board material: FR4, thickness 0.8 mm, 1 oz copper +- surface finish: ENIG (preferred) or tin +- via holes: diameter is nominally 10 mil, but any size <= 15 mil can be used +- mechanical tolerances: <= +/- 0.1 mm on all sides + +Layer stacking, from top to bottom: + +atben-SilkS_Front.gto Front silk screen +atben-Mask_Front.gts Front solder mask +atben-Front.gtl Front copper +atben-Back.gbl Back copper +atben-Mask_Back.gbs Back solder mask + +Other design files: + +atben-PCB_Edges.gbr Board edges, for routing (Gerber) +atben.dxf idem (AutoCAD DXF) +atben.drl Excellon drill file + +Interpretation of files: + +- do not print PCB edges on front/back copper +- 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)