Project File Analysis

flux

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:
  • 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 on OUT and VBAT, 4.7 uF minimum on input, THERM can be disabled with 10 kΩ to ground, SEL low + PROG2 high gives 500 mA USB mode, and TE high disables the timer.
    • MAX17048G+T10: SDA, SCL, ALRT, QSTRT, VDD, GND, EP, and only a 0.1 uF bypass capacitor is required.
  • 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, BAT rail, or SYS power-path output exists in the schematic.
  • ❌ U2 input was not re-architected from VBUS_5V to 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.
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ESP32-S3 Handheld Controller thumbnail
Production-intent ESP32-S3 handheld controller with USB-C sink power, ST7789 SPI TFT, 5-way controls, class-D speaker output, and factory test pads on a 4-layer PCB.

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