Hardware Reference: ESP32-S3-AUDIO-Board-EN
This document contains the hardware specifications, I2C device addresses, pinout mappings, and auxiliary information for the UeeKKoo (Waveshare) ESP32-S3-AUDIO-Board-EN (No Battery version).
1. System Specifications
- Microcontroller: Espressif ESP32-S3R8
- CPU: Dual-core Xtensa 32-bit LX7 CPU, running at 240 MHz.
- ROM: 384 KB
- SRAM: 512 KB
- External Storage & Memory:
- Flash: 16 MB external NOR Flash.
- PSRAM: 8 MB stacked PSRAM (connected via Octal SPI).
- Connectivity:
- Wi-Fi: 2.4 GHz (802.11 b/g/n).
- Bluetooth: Bluetooth 5.0 (LE).
- Operating System: FreeRTOS (standard in ESP-IDF).
- Power Input: USB Type-C (5V) & onboard lithium battery charging/discharging management.
- USB Ports: 1x Type-C port (USB-to-UART / Native USB).
2. Onboard Chips & I2C Addresses
The board utilizes a shared I2C bus on SDA: GPIO 11 and SCL: GPIO 10.
| Peripheral / Chip |
Model |
I2C Address (7-bit) |
Description |
| GPIO Expander |
TCA9555 |
0x20 |
Extends GPIO pins for keys, controls, and status lines. |
| Audio DAC (Playback) |
ES8311 |
0x18 |
Low-power mono audio codec chip driving the speaker. |
| Audio ADC (Recording) |
ES7210 |
0x40 |
High-performance 4-channel audio ADC for the digital mic array. |
| Real-Time Clock (RTC) |
PCF85063 |
0x51 |
Clock and timekeeper. |
3. Direct GPIO Pin Mappings
I2S Audio Bus (Shared)
| Signal |
GPIO Pin |
Connected To |
| I2S MCLK |
GPIO 12 |
System Clock for ES8311 & ES7210 |
| I2S BCLK |
GPIO 13 |
Bit Clock for I2S |
| I2S LRCK |
GPIO 14 |
Left-Right/Word Select Clock |
| I2S DIN |
GPIO 15 |
Microphone input (data from ES7210 ADC) |
| I2S DOUT |
GPIO 16 |
Speaker output (data to ES8311 DAC) |
Control Bus
| Signal |
GPIO Pin |
Description |
| I2C SDA |
GPIO 11 |
Shared I2C Data Line |
| I2C SCL |
GPIO 10 |
Shared I2C Clock Line |
Onboard LEDs
| Signal |
GPIO Pin |
Description |
| WS2812B DIN |
GPIO 38 |
Data Line for 7-ring programmable RGB LEDs (GRB/RGB order) |
4. TCA9555 GPIO Expander Mappings (I2C Address 0x20)
Peripherals such as the power amplifier enable and physical buttons are routed through the I2C-controlled TCA9555 expander to save ESP32-S3 physical pins.
| Expander Pin |
Signal Name |
Type |
Description |
Active State |
| Pin 8 |
PA_CTRL (PA_EN) |
Output |
Enables the onboard speaker power amplifier. Must be set high for sound. |
High (1) |
| Pin 9 |
KEY1 (Volume Down) |
Input |
Onboard physical push button (Key 1). |
Low (0 when pressed) |
| Pin 10 |
KEY2 (Play/Pause) |
Input |
Onboard physical push button (Key 2). |
Low (0 when pressed) |
| Pin 11 |
KEY3 (Volume Up) |
Input |
Onboard physical push button (Key 3). |
Low (0 when pressed) |
5. Expansion & Compatibility Interfaces
- Display Interface: Onboard 18-pin FPC header supporting SPI LCD screens:
- Compatible sizes: 1.47", 2", 2.8", 3.5" LCDs.
- Camera Interface: Onboard DVP camera header:
- Compatible camera sensors: OV2640, OV5640.
- TF Card Slot: Onboard MicroSD card slot for external audio asset storage and data logging.
