LilyGo T-Display-S3 AMOLED Touch Development Board

Code name:

LilyGo T-Display-S3 AMOLED Touch development board is based on esp32s3 microcontroller and uses architecture. This board has a maximum CPU frequency of NaN MHz and a flash size of 16MB.

⚡ Tech Specs 📌 Pinout 🔗 Useful Links 🗺️ Mappings 🛠️ Tools

About LilyGo T-Display-S3 AMOLED Touch

🚀 The LilyGo T-Display-S3 AMOLED Touch is a cutting-edge development board featuring an ESP32-S3 chip with integrated WiFi and Bluetooth 5 capabilities. It boasts a 1.91-inch AMOLED display with a resolution of 536x240 pixels, driven by an RM67162 controller, offering vibrant visuals for embedded applications. Now featuring capacitive touch support for intuitive user interactions. ⚡

Technical Specifications

🖥️ Display

Type AMOLED

Size 1.91"

Resolution 240x536

Driver RM67162

Touch Driver FT3267

🛰️ Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

BLE 5.0

🧠 Microcontroller

Model esp32s3

Flash Size 16MB

PSRAM Size 8MB

View Full Datasheet

LilyGo T-Display-S3 AMOLED Touch Pinout

✅ Safe Pins to Use

For general GPIO usage, these are the safest and most flexible choices:

🔹 IO1

🔹 IO2

🔹 IO4

🔹 IO5

🔹 IO6

🔹 IO7

🔹 IO8

🔹 IO15

🔹 IO16

🔹 IO17

Why Are These Pins Safe?

Not involved in bootstrapping → No impact on device boot mode or system startup
Not linked to flash memory or PSRAM → Won't interfere with storage or memory access
Not dedicated to USB or JTAG → Free for general use without affecting debugging
No special hardware connections → Freely assignable without internal conflicts

⚠️ Pins to Avoid or Use with Caution

Some pins are reserved for critical functions like bootstrapping, JTAG debugging, USB communication, and flash memory operations. Misusing these pins may lead to boot failures, programming issues, USB conflicts, or disruptions in flash storage.

Critical Pin Categories:

🛠️ Strapping Pins: Control boot behavior and flash voltage selection
🔗 JTAG Debugging Pins: Required for low-level debugging
🔌 USB Communication Pins: Used for USB Serial/JTAG communication
⚡ Flash Memory & SPI Pins: Connected to SPI flash memory and PSRAM
📡 UART Serial Communication Pins: Used for debugging and firmware uploads

PIN	Label	Reason	Function
IO0	GPIO0	Must be pulled high (default) or low (to enter UART download mode) at reset. Using it for other functions can interfere with boot mode configuration.	🛠️ Strapping
IO3	GPIO3	Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface.	🛠️ Strapping
IO9	FSPIHD	Connected to external flash (data/hold signal) on most modules. Not recommended for use as GPIO, since it must remain dedicated to flash communication.	⚡ Flash
IO10	FSPICS0	Used to select the external flash chip. It is required for flash access and cannot be repurposed without losing flash connectivity	⚡ Flash
IO11	FSPID	Used as a data line for flash (and in-package PSRAM). It should not be used as GPIO when the flash/PSRAM is in use.	⚡ Flash
IO12	FSPICLK	Drives the flash (and PSRAM) clock. This critical signal must be reserved for memory and not used as general GPIO.	⚡ Flash
IO13	FSPIQ	Used as a data line for flash/PSRAM transfers. Not available for other uses when flash/PSRAM is connected.	⚡ Flash
IO14	FSPIWP	Connected to external flash (data/write-protect signal). Not recommended as GPIO because it’s reserved for flash operations.	⚡ Flash
IO38	FSPIWP	On flash-equipped chips, this pin is tied to the flash’s WP# (or D3) line. It should be avoided for other use, as it’s needed for flash operations.	⚡ Flash

LilyGo T-Display-S3 AMOLED Touch Useful Links

🔗 Datasheet

https://github.com/Xinyuan-LilyGO/T-Display-S3-AMOLED

🔗 ESP32S3 Datasheet

https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf

LilyGo T-Display-S3 AMOLED Touch Pin Mappings

This development board provides digital IO pins, out of which can be used as external interrupt pins and as analog input pins .

Pin	Function	ESP Pin	Input/Output	Description
1	3V3	3.3V	POWER OUTPUT	3.3V power output
2	GND	GND	POWER GROUND	Ground connection
3	5V	5V	POWER INPUT	5V power input for the board
4	IO0	A0	BIDIRECTIONAL	GPIO, ADC pin, Touch, PWM
5	IO1	A1	BIDIRECTIONAL	GPIO, ADC pin, Touch, PWM
6	IO2	A2	BIDIRECTIONAL	GPIO, ADC pin, Touch, PWM
7	IO3	A3	BIDIRECTIONAL	GPIO, ADC pin, Touch, PWM
8	IO4	BAT_VOLT	INPUT	GPIO, Battery Voltage Sense, PWM
9	IO5	LCD_RES	OUTPUT	GPIO, LCD Reset, PWM
10	IO6	LCD_CS	OUTPUT	GPIO, LCD Chip Select, PWM
11	IO7	LCD_DC	OUTPUT	GPIO, LCD Data/Command, PWM
12	IO8	LCD_WR	OUTPUT	GPIO, LCD Write, PWM
13	IO9	LCD_RD	OUTPUT	GPIO, LCD Read, PWM
14	IO10	SS	BIDIRECTIONAL	GPIO, SPI Slave Select, PWM
15	IO11	MOSI	BIDIRECTIONAL	GPIO, SPI Master Out Slave In, PWM
16	IO12	SCK	BIDIRECTIONAL	GPIO, SPI Clock, PWM
17	IO13	MISO	BIDIRECTIONAL	GPIO, SPI Master In Slave Out, PWM
18	IO14	TOUCH_INT	INPUT	GPIO, Touch Interrupt
19	IO15	LCD_POWER_ON	OUTPUT	GPIO, LCD Power Enable, PWM
20	IO16	TOUCH_SCL	BIDIRECTIONAL	GPIO, I2C Clock for Touch
21	IO17	TOUCH_SDA	BIDIRECTIONAL	GPIO, I2C Data for Touch
22	IO38	LCD_BL	OUTPUT	GPIO, LCD Backlight, PWM

Function Pin Function

ESP Pin Pin on ESP32

I/O Input/Output Pin

Description Pin Description

Default Tools

The LilyGo T-Display-S3 AMOLED Touch development board by default uses uploader tool, network uploader tool for Over-the-air (OTA) uploads and bootloader tool. The bootloader starts at address "". Flash mode and boot mode for LilyGo T-Display-S3 AMOLED Touch development board by default is and respectively.