Root/atben/README-SMT

Source at commit 49e7c83796bc04941e9dbcec69bc0751563ff4d4 created 2 years 5 months ago.
By Werner Almesberger, atusb/: use ""VDD" symbol from kicad-libs
1Board characteristics:
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3- two layers, components only on front
4- smallest components are 0402 and 0.5 mm pitch QFN
5- the following component orientation markings are on the silk screen:
6  B1: circle near pin 1
7  U1: triangle at the corner between pins 1 and 32
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10Design files:
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12atben-front.png Illustration of the PCB's front side (with silk screen)
13atben-bom.csv Bill of materials
14atben-pos.csv Automatic insertion file (front only)
15atben-footprints.pdf Footprint reference drawings
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17The PCB design files (Gerbers, etc.) are in a separate archive, atben-pcb-*
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20Interpretation of files:
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22- for all coordinates, the origin is the lower left corner of the board
23- coordinates in atben-pos.csv are in inches
24- rotation in atben-pos.csv is in degrees, counter-clockwise
25- in the footprint reference drawings, footprints are shown in the 0 degree
26  orientation and with their center at the crosshairs
27

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