Attended: Kyaw, Tyler

• Finished Edits
  • Waiting on response from Kyle

• Still working on board edits from Kyle
  • Finished edits on the main board
  • Next is to finish edits on the sensor board
• Soldered a new sensor board
• Dylan will try programming the board with the new sensor board next time he comes in
• Changing the 1N4148 Diode from a SMD to a THRU

• Suggested edits from Kyle review on Dragon Fruit PCB V4
• General:
  • reallocate bottom plane to use as various split power planes
    • a ground plane is not needed on both top and bottom. instead, you can use vias to connect grounds from the bottom as needed
  • change placement of all headers to be on the edge of the board (good practice)
    • this helps to avoid cutting into power and ground planes
  • don't route traces into component pads diagonally (try to hit the pad straight)
  • avoid sudden trace width reduction (xb_en,n46 signals)
    • instead, keep trace width consistent
• Main Board:
  • reduce trace widths of miso, sck,mosi, and other data lines
    • 7 mils is usually enough for data signals
  • delete the bottom ground plane and replace with vload, +5v_mcu, and 3.3v_xb planes
  • place load header and voltage regulators closer to components
    • looking at your existing board layout, it seems like the top is the optimal place
  • don't need to route gnd trace for mcu because the entire top layer is ground
    • this is only needed if the plane is cut off entirely from the pin/component (known as an island)
  • avoid running traces near the board perimeter (xbee_tx, prog_rx, prog_tx signals)
  • avoid unnecessary use of planes (n46 signal)
    • due to the pin pitch of the voltage regulator, the plane is narrowed significantly
      • if the effective trace width of a plane is equivalent to that of a regular trace, it defeats the purpose of using a plane
    • rearrange components to maximize effective trace width from planes but also keeping planes compact
  • keep proper clearances from holes (C16 and U6)
  • avoid creating additional planes on the top layer
    • the +5V_SEN_S plane on the top severs the ground plane
      • +5V_SEN_S is already being used as the bottom plane so you can just use vias to connect components to that power plane
    • top plane should be reserved exclusively for gnd
  • remove gnd nubs (C27)
  • avoid using traces if planes can be utilized to connect signals
    • don't need to use traces to route gnd signal for gps
      • use vias instead

• SCEL Meeting 2/3/18!!!
• Generate Gerber files once green light is LIT from Kyle.

Contributing authors:

Created by khein on 2018/02/05 23:06.