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====== CUSF PCB Checklist ====== This PCB design checklist contains things you should check before you send a PCB off to manufacture. It includes generally good ideas and some lessons learned the hard way! Feel free to update as experience is gained. - Schematic Checks - Check component values (including tolerances and power ratings) - Check component pinouts (check against the footprint too!) - Check over any complicated or novel sections of the schematic, especially e.g. high power and RF - Check pin allocations on a microcontroller are compatible with required peripherals - Check any serial lines have RX/TX swapped where required - ESD diodes on all world-facing connectors - Check all parts have order codes for the correct item - Check app notes and datasheets for novel parts for hints on decoupling, layout, app circuits, etc - LED indicators (status, power, etc) - Use reasonably large LED resistors - don't need to blind anyone with indicators - Don't mix up global and local/hierarchical net labels - Check label directions are appropriate (inputs/outputs/bidi/etc) - Run ERC: no errors or warnings - PCB Checks - Decoupling capacitors all close to IC power pins, with smallest values closest to the pins - Power nets as simple and tree-like as possible. Avoid loops - Ground pours should have a bit more clearance than the minimum - Stitch ground planes together well if using more than one - Crystal traces as short and symmetrical as possible - ESD diodes as close to connector pins as possible - Check component footprints against datasheet for new footprints - Double check pinouts on the PCB against the datasheet - Ensure sufficient mounting holes are present, with enough clearance for bolt heads - If the PCB has to fit in a specific geometry, check board dimensions and connector placements - Silkscreen: - Date, revision, name - Pin 1 indicators - Power and other connector pin labels - Clearly mark polarity and functionality for connectors - LED labels - Orientation labels - Check datasheets for specific PCB layout advice - No copper underneath magnetometers - GPS receiver ground planes on both layers - Add test points to nets of interest - Print out a 1:1 copy and inspect visually for anything that stands out - Check over mask and stencil settings: avoid too much mask or paste - Check positions where they're important, e.g. board mounted connectors, outline shape, location of mounting holes - Round off PCB corners - Check power traces are as thick as practical and ground planes as complete as possible - Run DRC: no errors or warnings

pcb_checklist.txt · Last modified: 2016/07/20 15:41 by ag611