Root/m1/xbrd/README

Source at commit 5bf0b3050350f1d44a0a5654a9ffa314c82c2e10 created 11 years 11 months ago.
By Werner Almesberger, m1/xbrd/: reduced CB from 25 mm to 22 mm, reducing overall length to 82.08 mm
1xbrd - Expansion board design for M1r4 (and beyond)
2===================================================
3
4This is only a draft and may change quite a bit in the future.
5
6Top view:
7http://downloads.qi-hardware.com/people/werner/tmp/xbrd-top.pdf
8
9The parameters are as follows:
10
11Label Description Type Value
12------- --------------------------------------- ------- -------
13B Baseline between J21 and Jxx typ 45 mm
14CB Clearance, back max 22 mm
15CF Clearance, front max 10 mm
16CL Clearance, left (seen from front) max 5 mm
17CR Clearance, right (seen from front) max 15 mm
18FB Baseline to front wall typ 15 mm
19FW Front wall thickness typ 3 mm
20HL Header length (long side) typ 900 mil
21HW Header width (short side) typ 200 mil
22
23In the drawing, all dimensions are in mm.
24
25Typical dimensions would be things we decide in the design.
26
27Maximum dimensions would be limits for the expansion board
28designer (e.g., to avoid bumping into other components or
29walls).
30
31Unlabeled dimensions are calculated from the parameters and
32have only an informational character.
33

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