Pocket AI Note Assistant — main board (rev 0.2, schematic + first placement)

Pocket-sized ESP32-S3 voice notes / to-do device. Schematic generated from the v0.3 hardware proposal.

• MCU: ESP32-S3-WROOM-1-N16R8 (native USB on IO19/IO20)
• Power: USB-C -> BQ24074 charger with power path -> VSYS -> TPS63001 buck-boost -> +3V3; TPS22917 switches 3V3_P (display, mic, touch)
• Fuel gauge: MAX17048 (I2C)
• Audio: ICS-43434 I2S mic (I2S0), MAX98357A I2S amp (I2S1) from VSYS
• Display: 1.69" ST7789 SPI on a 10-pin FPC (pinout must be matched to the chosen panel), optional CST816 touch
• 5 buttons: PTT, POWER, SELECT, VOL+, VOL-

Status: not yet reviewed by a human engineer. PCB: 44 x 78 mm, 4 layers, parts placed but NOT routed (placement study).