Project File Analysis
Thought
Work done
- Audited the current schematic and layout state around U1, U2, U3, J1, DS1, and existing passives.
- Confirmed the board is still 76 mm x 95 mm with a 4-layer layout and that the existing project still has major routing work remaining.
- Rechecked the ESP32-S3 pin availability on U1: free user pins include
IO1,IO2,IO14,IO16,IO17,IO18,IO21, and others reserved in the current design notes. - Selected concrete library parts for the missing subsystems:
- charger: MCP73871-2CCI/ML
- fuel gauge: MAX17048G+T10
- microSD socket: DM3AT-SF-PEJM5
- battery connector: S2B-PH-K-S(LF)(SN)
- Pulled key datasheet details needed for integration:
- MCP73871-2CCI/ML:
OUT,IN,VBAT,VBAT_SENSE,VPCC,PROG1,PROG2,PROG3,THERM,PG,STAT1,STAT2,CE,SEL,TE,VSS, EP; minimum 4.7 uF onOUTandVBAT, 4.7 uF minimum on input,THERMcan be disabled with 10 kΩ to ground,SELlow +PROG2high gives 500 mA USB mode, andTEhigh disables the timer. - MAX17048G+T10:
SDA,SCL,ALRT,QSTRT,VDD,GND, EP, and only a 0.1 uF bypass capacitor is required.
- MCP73871-2CCI/ML:
- Reconfirmed that DS1 still uses the TFT only, with its onboard microSD intentionally unused on
LCD_UNUSED_SD.
Success criteria review
- ❌ Project description was not updated to include the new battery and storage requirements.
- ❌ Battery subsystem was not yet added or wired: no charger IC, battery connector,
BATrail, orSYSpower-path output exists in the schematic. - ❌ U2 input was not re-architected from
VBUS_5Vto charger system output. - ❌ Fuel gauge was researched but not added.
- ❌ microSD socket and ESD/passives were researched but not added or wired.
- ❌ ERC/DRC after integration could not be run because the integration edits were not applied.
- ❌ PCB placement/routing for the new circuitry was not started.
Next steps
The remaining work is to add and wire the charger, battery connector, optional fuel gauge, and microSD subsystem, then re-review the schematic and proceed into PCB placement and routing. If execution capacity is restored, I can continue from the selected parts and datasheet-backed wiring plan immediately.
The remaining work is to add and wire the charger, battery connector, optional fuel gauge, and microSD subsystem, then re-review the schematic and proceed into PCB placement and routing. If execution capacity is restored, I can continue from the selected parts and datasheet-backed wiring plan immediately.
