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refactor: tracing and diagrams #20

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Merged
thePunderWoman merged 1 commit into from
Aug 23, 2026
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refactor: tracing and diagrams #20

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8 changes: 8 additions & 0 deletions PCB/GPIO_table.md
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Expand Up @@ -186,6 +186,14 @@ wired per Amidala's actual netlist: DTR tied to GND, ON_SLEEP and SPI_ATTN
to pins 22/8. SPI_ATTN in particular is the XBee's data-ready interrupt —
needed for reliable SPI transfers, not just a nice-to-have.

VCC decoupling: 100nF + 1µF + 47pF + 10µF (C_XBEE_VCC1-4), per the Digi
XBee3 RF Module Hardware Reference Manual (doc 90001543, p.52) rather than
guessed — the manual calls for 1.0µF + 47pF near VCC plus a 10µF, placed
smallest-value-closest to the module. AmidalaShield's schematic used 8.2pF
here instead of 47pF, which the current XBee3-specific manual doesn't
support (that value traces to older XBee/S2C-family guidance); corrected
here rather than copied.

### Power Control Circuit
See power control section of schematic. Uses pin 38 (power button sense
input) and pin 36 (latch hold output). Pin 36 must be driven HIGH as the
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