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ben-wpan/atusb/README-SMT

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Board characteristics:
- two layers, components only on front
- smallest components are 0402 and 0.5 mm pitch QFN
- one through-hole component: USB connector CON1
- the following orientation markings are on the silk screen:
B1: circle near pin 1
D1: plus sign at the anode
U1, U2: triangle at the corner between pins 1 and 32
Design files:
atusb-bom.csv Bill of materials
atusb-pos.csv Automatic insertion file
* footprints
The PCB design files are in a separate archive, atusb-pcb-*
Interpretation of files:
- for all coordinates, the origin is the lower left corner of the board
- coordinates in atusb-pos.csv are in inches
- rotation in atusb-pos.csv is in degrees, counter-clockwise