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Reduce LGA stencil mask area to 50-70% coverage per IPC for ESP32 family

Ed Peguillan III requested to merge github/fork/yankee14/modify_ESP32 into master

Reduce LGA stencil mask area to 50-70% coverage per IPC recommendation for:

  • ESP32-WROOM-32
  • ESP32-WROOM-32U
  • ESP32-S2-WROVER

For ESP32-WROOM-32 and ESP32-WROOM-32U, the center pad is 5mm x 5mm for an area of 25mm^2. 60% of that is 15mm^2. I elected to divide this area into 9 squares, which each square having dimensions ((15mm^2) / 9)^(1/2) ~= 1.3mm x 1.3mm.

For ESP32-S2-WROVER, the center pad is 4.1mm x 4.1mm, for an area of 16.81mm^2. 60% of that is ~=10mm^2. I elected to divide this area into 4 squares, with each square having dimensions ((10mm^2) / 4)^(1/2) ~= 1.6mm x 1.6mm.

Screencaps:

ESP32-S2-WROVER: image

ESP32-WROOM-32x: image

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Edited by kliment

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