| ESP32-S3-WROOM-1 |
The ESP32-S3-WROOM-1 module embeds the ESP32-S3R8 chip variant that provides Wi-Fi and Bluetooth 5 (LE) connectivity, as well as dedicated vector instructions for accelerating neural network computing and signal processing. On top of the integrated 8 MB PSRAM offered by the SoC, the module also comes with 16 MB flash, allowing for fast data access. |
| PDM Interface (reserved) |
Reserved FPC connector for connecting the sub board to use three digital microphones having a pulse-density modulated (PDM) output. |
| 5 V to 3.3 V LDO |
Power regulator that converts a 5 V supply into a 3.3 V output for the module. |
| 5 V Power On LED |
The LED (red) turns on when the USB power is connected to the board and the Power Switch is toggled to "ON". |
| Power Switch |
Toggling it to “ON” powers on the board; toggling it to “OFF” powers off the board. |
| Battery Socket |
Two-pin socket to connect a Li-ion battery. The battery serves as an alternative power supply to the USB Power Port for charging the board. Make sure to use a Li-ion battery that has protection circuit and fuse. The recommended specifications of the battery: capacity > 1000 mAh, output voltage 3.7 V, input voltage 4.2 V – 5 V. Please verify if polarity on the battery plug matches polarity of the socket as marked on the board’s soldermask besides the socket. |
| Battery Charger Chip |
1 A linear Li-ion battery charger (AP5056), used for charging a battery connected to the Battery Socket. The power source for charging is the USB Power Port. |
| Battery Green LED |
When the USB power is connected to the board and a battery is not connected, the green LED turns on. If a battery is connected and fully charged, the green LED turns on. |
| Battery Red LED |
When the USB power is connected to the board and a battery is not connected, the red LED blinks. If a battery is connected, the red LED turns on, indicating that the battery is being charged. When the battery is fully charged, the red LED turns off. |
| USB Power Port |
A Micro-USB port used for power supply to the board. |
| USB-to-UART Bridge |
Single USB-to-UART bridge chip provides transfer rates up to 3 Mbps. |
| FPC Connector |
Connects the main board and the sub board. |
| USB-to-UART Port |
A Micro-USB port used for communication with the chip via the on-board USB-to-UART bridge. |
| Reset Button |
Press this button to reset ESP32-S3. |
| Boot Button |
Download button. Holding down Boot and then pressing Reset initiates Firmware Download mode for downloading firmware through the serial port. |
| MicroSD Card Slot |
Used for inserting a MicroSD card to expand memory capacity. SPI mode is supported. |
| Audio_VCC33 |
Power regulator that converts a 5 V supply into a 3.3 V output for the audio. |
| Speaker Output |
Output socket to connect a speaker. A 4-ohm, 3-watt speaker is recommended. The pins have a 2.00 mm / 0.08” pitch. |
| PA Chip |
Ultra-low EMI, filterless, 3-watt mono class D audio amplifier chip. |
| ADC Chip |
Multi-bit delta-sigma audio ADC with four channels (ES7210). It features 102 dB signal-to-noise ratio, –85 dB THD+N, 24-bit, 8 to 100 kHz sampling frequency, I2S/PCM master or slave serial data port, and supports TDM. It communicates with ESP32-S3 through I2S and I2C interface. |
| Headphone Output |
Output socket to connect headphones with a 3.5 mm stereo jack. Please note that the board outputs a mono signal. |
| Codec_3V3 (NC) |
Alternative power supply to the Codec chip. It is not connected or used by default. |
| Audio Codec Chip |
The audio codec chip, ES8311, is a low power mono audio codec. It consists of 1-channel ADC, 1-channel DAC, low noise pre-amplifier, headphone driver, digital sound effects, analog mixing and gain functions. It is interfaced with the ESP32-S3-WROOM-1 module over I2S and I2C buses to provide audio processing in hardware independently from the audio application. |
