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ben-wpan/atben/README-SMT
Werner Almesberger 38bea8ec54 README-SMT: various small clarifications
- atben/README-SMT, atusb/README-SMT: added "component to "orientation"
- atben/README-SMT, atusb/README-SMT: added "drawings" to "footprint
  reference"
- atben/README-SMT, atusb/README-SMT: mention once more that the automatic
  insertion file is for the front only
2011-03-24 12:18:14 -03:00

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Board characteristics:
- two layers, components only on front
- smallest components are 0402 and 0.5 mm pitch QFN
- the following component orientation markings are on the silk screen:
B1: circle near pin 1
U1: triangle at the corner between pins 1 and 32
Design files:
atben-front.png Illustration of the PCB's front side (with silk screen)
atben-bom.csv Bill of materials
atben-pos.csv Automatic insertion file (front only)
atben-footprints.pdf Footprint reference drawings
The PCB design files (Gerbers, etc.) are in a separate archive, atben-pcb-*
Interpretation of files:
- for all coordinates, the origin is the lower left corner of the board
- coordinates in atben-pos.csv are in inches
- rotation in atben-pos.csv is in degrees, counter-clockwise
- in the footprint reference drawings, footprints are shown in the 0 degree
orientation and with their center at the crosshairs