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PM_K-1 hardware: note locally-saved EVM/reference layouts in LAYOUT_REFERENCES.md

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Downloaded the 3 priority reference layouts into hardware/datasheets/ (git-ignored):
- TPS65131EVM_SLVUAW7.pdf (switcher EVM 4-layer plots + BOM)
- TPS7A30-49EVM_SLVU405.pdf (+/-15V dual-LDO EVM, schematic+layout+BOM)
- RP2350-Minimal-KiCAD.zip (official RP2350 KiCad: nested RP2350A/QFN-60 + RP2350B/QFN-80)
Verified the switcher EVM contains the full Top/Inner1/Inner2/Bottom layer plots.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Me Here 2026-05-31 18:51:51 -05:00
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hardware/LAYOUT_REFERENCES.md
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@ -100,3 +100,13 @@ principles. Two of these are essentially our exact circuit.
Hand these (plus `LAYOUT.md`) to whoever routes the board; they cover every stage where Hand these (plus `LAYOUT.md`) to whoever routes the board; they cover every stage where
layout — not schematic — determines whether it works. layout — not schematic — determines whether it works.
## Saved locally (in `hardware/datasheets/`, git-ignored)
The three priority references are downloaded for offline use:
- **`TPS65131EVM_SLVUAW7.pdf`** — switcher EVM, includes the full **4-layer PCB plots**
(Top / Inner 1 / Inner 2 / Bottom) + BOM (which matches our TPS65131RGER / 4.7 µH / MBRM120).
*Copy this layout for the switcher block.*
- **`TPS7A30-49EVM_SLVU405.pdf`** — the ±15 V dual-LDO EVM (schematic + layout + thermal + BOM).
- **`RP2350-Minimal-KiCAD.zip`** — official RP2350 reference. **Nested:** unzip it, then extract
`RP-006440-...RP2350A Minimal Board Kicad archive.zip` (RP2350A / QFN-60 = our part) for the
schematic + PCB + footprints; the `RP-006442` archive is the QFN-80 (RP2350B) variant.