Drogheda/03-Architecture-Hardware/2026-09-28_v6-audit-attachments/Delegated-Decisions_2026-09-28.md

Decisions for the v6 correction pass — taken by Claude on Leo's delegation (2026-09-28 17:20 CST)

!!! warning "Designators from before 22-Oct (T43)" This document keeps the designators the board had on its date. Since 22-Oct (T43) the V5.6, V5.7 and v6 carry new ones, and several old names now belong to another part: on the v6, U6 is now the A7670SA modem (was U19) and the LTC4040 is U17 (was U6). To read it against today's board, use the old → new table (in Spanish); parts already gone by 22-Oct are not in it.

Leo: "if a change can be done at the schematic level we should do that — make the best decisions for me". IDs refer to /home/claude/v6audit/report/2026-09-28_Drogheda_EinarBoard-v6_Full-Audit_v1.0.md (§5 ranked list, §6 layout list, §7 schematic change list, §8 firmware). Verification files: findings/verify_1.md, findings/verify_2.md.

#	Question (report §10)	Decision	Why
D1	Supply context	HBOX input = the cabinet's regulated 24 V (Mean Well DDR-60G-24), per the project hard constraint; the board keeps its 9–36 V margin. Ignition = raw machine ignition, 12 V and 24 V machines (ICAVE: RTG / Reach Stacker / Empty Handler 24 V; Tractoplana / Montacargas 12 V).	CLAUDE.md §1c + §4
D2	Modem supply topology (A-01, B-01, V1-01)	Adopt the verified topology: U20 fed from /MAIN5V only; D20 and D21 removed (direct connection MAIN5V → U20 VIN); fan from /VEH5V (U2 fan-buck block DNP, JP1 bridged); the Q10 /24V branch DNP once it has no loads; F2 = 3 A (C206912), electrically ahead of D10. Prerequisites in the same pass: A-04, A-05 (CSYS + 2×47 µF), U20 input caps (2×22 µF + 220 µF), B-02 loop values.	Removes the D21 failure mode and the unfused branch with fewer parts; verify_1 checked U25 ≤ 2.95 A
D3	R50	1.43 kΩ (C22840): ≥ 1.3 A at every corner, below the 2.5 A limit	A-03 verified
D4	U25 set-point	R121 = 57.6 k (C23082) → 5.18/5.32/5.46 V; firmware V5_PFI → 4.40 V	A-04
D5	LTE antenna ESD	Fit PESD0402-240 (C1975527) on an 0402 land (keep protection; the antenna cable leaves the box)	B-03 verified
D6	GNSS antenna bias	TPS2552DBVR (C46506), ILIM→IN (75 mA), ANT_OFF→EN̅, FAULT̅→ANT_SHORT_N	C-01
D7	Charger temperature	"Sensor ≤ 10 mm of U6" is binding: implement F-51 fully (TMP102 C99269 @0x48 beside U6 + pack-NTC tap to PC5: 100 k C25803 / 120 k C25808 / 10 nF C1589)	R4; lesson F5
D8	PD2	PD2 = ETH_PWR_EN (E-01, U12 enable + 100 k pull-down). Board ID = firmware-only (probe the F9P / RTK_STAT behaviour at boot, D-08); PA9 stays the debug-TX pad (D-12)	Hardware power gating beats a strap; ID can be detected
D9	Battery mode	LTE-only on battery (AT+CNMP=38); Ethernet off on battery	A-05, B-16
D10	J10 / P11 / P12	Populated (Ethernet + RS-485/RS-232 are v6 features, EinarBoard 1.1 decisions). Schematic footprints corrected to the ordered parts (P11/P12 right-angle = the PCB's Horizontal footprint; J10 to a library nickname that exists). Michelle clears the PCB DNP flags	G-03 / H-06
D11	Enclosure	v6 must fit the existing V5.5 backplate / standoffs (v6 brief: "no enclosure rework") → G-01 = Blocker: restore V5.5 MH4 and the heatsink-clamp holes (MH11 + partner); L6 moves anyway with A-02	G-01
D12	Fab stackup	JLC04161H-7628 with impedance control, ENIG, 1 oz inner copper (and still widen inner power runs per A-07)	F-06, A-07, J-02
D13	BOM tool	Fabrication Toolkit → delete LCSC Part from U25's footprint in Drogheda-v6.pretty and on the board	H-04
D14	Order quantity	20 prototypes first; re-check stock on order day; pre-order J14 (and U18/U19 if going to 100)	H-02, H-02b
D15	Firmware	Report §8 → FW 0.7.x board_v6.h; not part of this pass	—
D16	Minors	Schematic-only value/field Minors from §7.3 are applied when trivially safe; the rest go to the layout list or v6.1	—
D17	Where to edit	In place in hbox-watchdog-v6.* (Leo's rule 28-Sep 20:20: iterations of a board are edited in place; old state recoverable from git). Pre-change copies in kicad/_to_delete/v6-apply-20260928/. The .kicad_pcb is not touched (Michelle's file); she runs Update PCB from Schematic	preferences
D18	Netclasses / DRC rules (F-01)	Applied now in .kicad_pro (netclass patterns, RF + PWR_MODEM classes) and .kicad_dru (verify_2's corrected rules), so DRC becomes the release gate	F-01

D19 — Scope of the schematic pass (report §7)

• All of §7.1 (Blockers) and §7.2 (Majors) that touch the schematic/project, exactly as listed, with the D-decisions above. G-01 is layout-only (Michelle).
• §7.3 Minors applied (schematic-only, low risk): A-11 (R56 → pull-up, charger OFF by default = safe state), A-13 (PFO → PB10 + 100 k), B-09 (22 Ω + 100 nF), B-10 (pulls + R106 → 1 k), C-07 (test pads), D-02 (Y3 → 3225 C2901684 + 12 pF; Michelle places it ≤ 5 mm from the MCU), D-03 (Y4 CL 7 pF + 6.8 pF), D-05 (Rigb1 → 2.2 k; firmware reads ignition on the ADC), D-09, D-12 (TP9), E-03 (keep Y1, C95/C96 → 33 pF C1663; no footprint change), E-04, F-52 (modem TMP102 at 0x49), G-03 (footprints per D10, populated), G-04 (JP_CUT), G-08 (3× ESD), H-08 (value texts), J-04 (orphan NC flags, NC-on-connected flags, wire stubs; re-link missing symbols only if straightforward), B-15 (R107/R108 DNP + "never fit").
• §7.3 NOT applied (→ v6.1 or layout): D-08 (board-ID strap; decided firmware-only), H-03 (MWSA0804S footprint: no land drawing available; V5.5 same pairing works), J-03 (library-wide pin types; cosmetic).