Root/atusb/README-SMT

1Board characteristics:
2
3- two layers, components only on front
4- smallest components are 0402 and 0.5 mm pitch QFN
5- one through-hole component: USB connector CON1
6- the following component orientation markings are on the silk screen:
7  B1: circle near pin 1
8  D1: plus sign at the anode
9  U1, U2: triangle at the corner between pins 1 and 32
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12Design files:
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14atusb-front.png Illustration of the PCB's front side (with silk screen)
15atusb-bom.csv Bill of materials
16atusb-pos.csv Automatic insertion file (front only)
17atusb-footprints.pdf Footprint reference drawings
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19The PCB design files (Gerbers, etc.) are in a separate archive, atusb-pcb-*
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22Interpretation of files:
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24- for all coordinates, the origin is the lower left corner of the board
25- coordinates in atusb-pos.csv are in inches
26- rotation in atusb-pos.csv is in degrees, counter-clockwise
27- in the footprint reference drawings, footprints are shown in the 0 degree
28  orientation and with their center at the crosshairs
29

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