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drzwave / ZRAD

Z-Wave USB Controller with best-in-class RF range Reference Design
MIT License
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Rev A PCB issues #2

Closed drzwave closed 7 months ago

drzwave commented 7 months ago
  1. The refdes are not ordered relative to their position on the PCB. I forgot to run the reorder after placement so the refdeses are the random order they were placed on the schematic.
  2. C11 and C12 are 220pF caps but have a 0603 footprint instead of 0402. The 0402 can be installed in the 0603. Fixed in Schematic, not PCB.
  3. The color LED is the wrong pinout in the schematic - the LED needs to be a common anode, not cathode. The footprint has the wrong pinout for the selected LED - QLSP14RGB_B (7 cents) which is a good LED. Might have to make a custom footprint and symbol to fix it.
    • A LED I've used before is: CLV1A-FKB-CJ1M1F1BB7R4S3CT ($0.38) Though it does have 3.2V forward drop which won't work if on battery power where the voltage might be only 2.4V.
  4. The infeed track width to be 50 ohms should be .44mm instead of .3. Move L1 to the right just enough to get the flood fill to fill in between L1 and L2. Ideally squeeze a via in there. The traces out of the ZG23 have to start at .2mm (same size as the pad) but should widen immediately to .44mm.
  5. Switch from the CP2102N QFN20 to the QFN24 package. The QFN20 has 4 pins that are below and recessed slightly within the package. The QFN20 is a standard pin arrangement so the solder joints can be visually inspected and reworked as needed.
  6. The QWIIC connector footprint has thru-holes but the part is SMT.
  7. Label the signals on the Tag-Connect
  8. Add an optional reset switch (normally not mounted). It's just super handy during debug to be able to reset the chip by pressing a button.
drzwave commented 7 months ago

  1. Fixed - Not quite as "ordered" as I'd like. I'm not sure why adjacent devices have significantly different numbers. Maybe the orientation? Still much easier to find the location than the random numbers before. The BOM has to be updated too.

  2. Fixed

  3. Fixed - made a custom footprint for it.

  4. Fixed

  5. Fixed

  6. Fixed

  7. Fixed

  8. Fixed

Rev B PCB released to OSH Park