• Completed BMS external protection wiring around IC1: added shunt R9 to IC1 SRP/SRN, added back-to-back protection FETs Q1/Q2 driven by IC1 DSG/CHG, and wired cell-tap connector J3 into the BMS sense pins with RC filtering.
• Enforced arm-switch series path by wiring U5 in series between pack positive and load rail: PACK_B+ -> U5 -> LOAD+.
• Implemented a hardware charge interlock so the LED driver is forced off during charging by pulling U1 SHDN/UVLO low via Q3 from charger status.
• Set the PCB layout size to 40.0 mm x 50.0 mm.

• ✅ The BMS protection circuitry is integrated with IC1 including shunt + CHG/DSG FET gating.
• ✅ The off-board arm switch interface U5 is wired in series between pack and load.
• ✅ The LED driver U1 is hard-disabled during charging using charger status hardware interlock.
• ❌ DRC is not passing because the PCB is not placed/routed (Airwires remain). I cannot auto-route or place components.

• Place parts and run Flux Auto-Layout routing (or route manually). After that, I can re-run DRC (especially Airwires/Overlapping Copper/Floating Copper) and help you clear remaining violations.

Click the PCB tab. Your schematic components become footprints on the board. Define the board outline and arrange components based on the ratsnest.

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