• Status: AMOLED architecture review; schematic migration not yet authorized.
• Bandido is a compact ESP32-S3 AI companion with an exposed black AMOLED touchscreen in a textile/soft-touch body.
• Target envelope: approximately 52 × 75 × 17 mm.
• The former discrete RGB matrix, diffuser, central LED island, and touch ring are superseded.

• All-day portable companion with short interactive sessions.
• Character animation, eyes, expressions, waveforms, simple icons/text, touch, voice, motion, haptics, BLE, and duty-cycled Wi-Fi.
• Primary AI runs through cloud services or a paired phone; local hardware provides UI, audio, sensing, connectivity, and lightweight DSP/wake-word support.
• First integrated build target is 5–10 EVT units after display-module bench qualification.

• Render 30–60 FPS character animation on a 2.0–2.1 inch AMOLED.
• Support capacitive touch, microphone capture, speaker playback, orientation/motion wake, refined haptics, and one wake-capable side action button.
• Charge and operate through USB-C from a protected 600–800 mAh 1S Li-Po.
• Sleep aggressively when inactive and share a hardware-abstraction/software architecture with the M5Stack development puck.

• ESP32-S3 module with 16 MB flash, 8 MB PSRAM, native USB, Wi-Fi, and BLE.
• Replaceable FPC-connected AMOLED/touch module, preferably ~368 × 448, 600–800+ nit, QSPI, CO5300-class display controller, and CST820-class touch.
• Audio codec plus efficient class-D speaker stage, low-power 6-axis IMU, and LRA haptics.
• Charger with power path, protected cell, fuel gauge, battery-temperature provision, USB ESD, and switched peripheral rails.

Diagram

• Preferred module class: 2.0–2.1 inch, ~368 × 448, QSPI AMOLED, integrated/bonded touch, exposed cover surface.
• Required display signals: OLED_CS, OLED_SCK, OLED_D0–D3, OLED_TE, OLED_RST, power, grounds, and optional enable.
• Touch signals: TOUCH_SDA, TOUCH_SCL, TOUCH_INT, TOUCH_RST.
• Exact module MPN, FPC pinout, voltage domains, initialization commands, connector orientation, and lifecycle must be frozen before schematic capture.
• Avoid MIPI-DSI-only panels unless ESP32-S3 is intentionally replaced.

• Preferred module: ESP32-S3-WROOM-1-N16R8 or pin-compatible approved variant.
• Reserve native USB, boot/reset access, and valid states for GPIO0/GPIO45/GPIO46.
• Do not allocate GPIO35–42 where occupied by module flash/Octal PSRAM.
• Place module antenna at the top exterior edge with the complete manufacturer keepout clear of copper, battery foil, display metal, speaker magnet, haptic actuator, fasteners, and conductive textile.

• Preferred architecture: ES8311-class low-power codec on I2S/I2C, analog MEMS microphone, and a separate efficient ~1 W class-D amplifier.
• Validate codec/amp availability and noise performance before release; retain a digital-microphone plus I2S-amplifier fallback if codec sourcing or analog layout risk is unacceptable.
• Provide a sealed speaker back volume, controlled vent, acoustic mesh, microphone gasket/channel, amplifier shutdown, and pop suppression.

• Preferred IMU: BMI270, with interrupt-based motion wake.
• Preferred haptics: DRV2605L + compact LRA; ERM remains a lower-cost fallback.
• Mechanically isolate the IMU and microphone from the actuator and speaker cavity.

• USB-C sink with native USB data, CC pull-downs, ESD, and source-current detection/limiting assumptions.
• Preferred baseline: BQ25622-class charger/power path, protected 1S Li-Po, MAX17048/MAX17049-class gauge, and TPS63802-class 3.3 V buck-boost. Final selection requires a completed state-based load table and cell qualification.
• Provide switched display and audio domains, ship mode/hard-off strategy, undervoltage and thermal lockouts, current/rail test points, and battery NTC provision.

• QSPI AMOLED: 6 data/clock/select signals plus TE, reset, and optional enable.
• I2C: touch, IMU, haptic driver, fuel gauge, charger controls, and codec control; confirm addresses and bus capacitance.
• I2S: codec audio stream; optional second digital-audio path only if ESP32 peripheral allocation permits.
• USB: native D+/D− with ESD and controlled routing.
• GPIO: side button, wake interrupts, rail enables, display reset/TE, amplifier enable, and debug.

• Target battery: 600–800 mAh, protected and documented for the selected charge rate.
• Deep-sleep target at battery: <0.3 mA, stretch target <0.15 mA.
• Connected idle target: 20–80 mA average, depending on BLE/Wi-Fi duty cycle.
• Typical active interaction planning range: 0.8–2.0 W; short audio/Wi-Fi/display peaks may approach 3 W until measured.
• A 700 mAh, 3.7 V cell stores ~2.6 Wh nominal. All-day use is plausible if the screen is off most of the time, Wi-Fi is duty-cycled, and active sessions remain short.
• Regulator, charger, cell, connector, and thermal sizing must use measured peak/average loads and worst-case depleted-cell voltage.

• Prefer one 4-layer main PCB plus a purchased display/touch assembly on replaceable FPC.
• Consider 6 layers only if routing, return paths, EMC, or form-factor pressure justify it.
• EVT enclosure: SLA/MJF/CNC with replaceable display adhesive frame and serviceable battery.
• Include accessible programming and rail test points, serial-number traceability, and board-level display/touch/audio/RF test fixtures.

• Bandido Runtime HAL: Display, Touch, Audio, Motion, Haptics, Power, Connectivity, and Character Engine.
• UI/character code must not depend directly on puck versus custom display geometry.
• ESP-IDF preferred; support PSRAM-backed assets/framebuffers, OTA, native USB recovery, deep sleep, wake sources, and power-domain sequencing.

• Exposed glossy black display; textile or soft-touch material terminates cleanly at the display perimeter.
• Landscape display orientation within a portrait body.
• Top attachment hole, one side action button, USB-C, and rear/side speaker vent; no front physical buttons.
• Freeze the exact display, battery, speaker, LRA, antenna keepout, and FPC bend before board outline and enclosure tooling.

• AMOLED replaces the complete discrete-RGB architecture.
• ESP32-S3 N16R8 module and QSPI display preserve compatibility with the development puck.
• One main PCB is preferred; a daughterboard is allowed only for a clear packaging advantage.
• LRA haptics and codec-based audio are preferred for product quality, subject to EVT validation.
• Existing 417-component RGB schematic is retained only as historical validation work until migration is approved.

• No exact AMOLED MPN has yet been independently qualified; module purchase and bench validation are the first gate.
• Display and battery pricing remain estimates until supplier RFQs and lifecycle evidence are obtained.
• Final GPIO allocation waits for exact display FPC and ESP32 module confirmation.
• Product is not waterproof in EVT.

• Replaced textile-covered RGB matrix requirements with an exposed AMOLED touchscreen architecture.
• Removed TLC59581, row switching, high-current LED rail, LED island, touch ring, diffuser, and display blanking requirements.
• Added Bandido Runtime compatibility, codec-based audio direction, 600–800 mAh battery target, and one-main-PCB preference.