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ben-wpan/atusb/README-SMT
Werner Almesberger f4342f49ae atusb: enlarged USB positioning pin hole; general cleanup
- modules/usb_a_plug_smt.fpd: enlarged hole for positioning pins from
  1.1 mm to 1.15 mm
- atusb/usb.sch, atusb/atusb.cmp, atusb/atusb.brd: removed trailing space
  from CON1's value
- atusb/atusb.sch, atusb/usb.sch, atusb/atrf.sch: schematics title still
  said AT86RF230, not 231
- atusb/README-SMT: corrected a typo
- atusb/README-PCB: specified the tolerance of the hole for the positioning
  pins of the USB connector
- atusb/README-PCB: added the 16-17 mm hole for the USB connector to the
  specification
- atusb/: bumped all version numbers to 20110330
2011-03-31 03:27:11 -03:00

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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 component 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-front.png Illustration of the PCB's front side (with silk screen)
atusb-bom.csv Bill of materials
atusb-pos.csv Automatic insertion file (front only)
atusb-footprints.pdf Footprint reference drawings
The PCB design files (Gerbers, etc.) 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
- in the footprint reference drawings, footprints are shown in the 0 degree
orientation and with their center at the crosshairs