T-ETH Lite S3

Overview

T-ETH Lite S3 is an Ethernet-enabled IoT development board based on ESP32-S3 (16 MB Flash, 8 MB PSRAM). Features W5500 Ethernet controller with optional PoE expansion, TF card slot (SPI), extensive GPIO interfaces (GPIO00–GPIO20, GPIO38–GPIO46) including ADC, touch (TOUCH03–TOUCH08), and dedicated output pins (GK_OUT1/GK_OUT2). Suitable for IoT endpoints, industrial control systems, and low-power edge computing.

T-ETH Lite S3 is the ESP32-S3 version. For the ESP32 version see T-ETH Lite.

Quick Start

Example Support

Example	PlatformIO/Arduino	ESP-IDF	Description
T-ETH-Series Examples	✓		Ethernet, LoRa, LTE examples

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code
3. Clone the LilyGO-T-ETH-Series repository
4. Open platformio.ini and uncomment the desired example
5. Click ✓ to compile, click → to upload

Arduino

1. Install Arduino IDE
2. Add ESP32 boards URL: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
3. In Tools → Board, configure:

Arduino IDE Setting	Value
Board	ESP32S3 Dev Module
Upload Speed	921600
USB Mode	Hardware CDC and JTAG
USB CDC On Boot	Disabled
USB Firmware MSC On Boot	Disabled
USB DFU On Boot	Disabled
CPU Frequency	240 MHz (WiFi)
Flash Mode	QIO 80 MHz
Flash Size	16MB (128Mb)
Core Debug Level	None
Partition Scheme	16M Flash (3MB APP/9.9MB FATFS)
PSRAM	OPI PSRAM
Arduino Runs On	Core 1
Events Run On	Core 1

4. Click Upload

Development Platforms

1. PlatformIO
2. Arduino IDE
3. ESP-IDF
4. MicroPython

Video

Key Features

• ESP32-S3 dual-core LX7 @ 240 MHz, 16 MB Flash, 8 MB OPI PSRAM, Wi-Fi + BT 5.0
• W5500 Ethernet, optional PoE expansion board
• TF card slot (SPI), 2 × 15-pin IO expansion, 4 × 2 mm mounting holes
• Wide GPIO range: ADC, capacitive touch, dedicated output pins

Product Parameters

Feature	Specification
MCU	ESP32-S3 @ Dual-core LX7, 240 MHz
Flash	16 MB
PSRAM	8 MB (OPI)
Wi-Fi	2.4 GHz 802.11 b/g/n
Bluetooth	Bluetooth 5.0 LE
Ethernet	W5500
PoE	Optional expansion board
Storage	TF card slot (SPI)
USB	1 × Type-C
Expansion	2 × 15-pin IO
Buttons	BOOT + RESET
LED	Power/Link/ACT indicators
Mounting Holes	4 × 2 mm

Pin Diagram

Dimension Diagram

Schematic

• T-ETH-Lite-ESP32S3 Schematic

Datasheet

• DP9900M PoE
• DP5300 PoE

Software Development

• LilyGO-T-ETH-Series GitHub Repository

Dependent Libraries

• Adafruit_BME280_Library
• Adafruit_NeoPixel
• ETHClass2
• LoRa
• RadioLib
• TFT_eSPI
• TinyGPSPlus
• TinyGSM
• U8g2

FAQ

• Q. Why does my board keep failing to upload programs? A. Hold down the BOOT button and try uploading again.

• Q. Why is USB CDC On Boot set to Disabled? A. T-ETH Lite S3 uses hardware Ethernet requiring specific boot configuration. Keep USB CDC On Boot Disabled for correct operation.

Version History

Version	Release Date	Update Description
T-ETH Lite S3 V1.0	—	Initial version (ESP32-S3)