Hardware

Specifications

Power	PH2.0 2P, 3.3V-6V, Min 3.55V@600mA
USB	USB 2.0 Type-C, PD 5V
MCU	ESP32 S3
Flash	8MB
PSRAM	2MB
Display	2.8 Inch 320x240 IPS, SPI
Touch	FT6206 Capacitive IIC
Size	76x58mm
Mounting Holes	M2 x 4
SD Card	Micro SD with SPI Interface
Buttons	IO0 and Reset button

Pinout

Pin Assignment

General Pins

ESP32 S3	General
GPIO11	MOSI
GPIO13	MISO
GPIO12	SCLK
GPIO8	SDA
GPIO9	SCL
GPIO1	Battery Level
GPIO2	Charge Detect
GPIO0	Button
GPIO10	TFT CS
GPIO18	TFT D/C
GPIO14	TFT Reset
GPIO48	TFT Backlight (See Selectable pins)
GPIO21	uSD CS
GPIO47	uSD Card Detect (See Selectable pins)

LCD Pins

ESP32 S3	LCD
GPIO11	MOSI
GPIO13	MISO
GPIO12	SCLK
GPIO10	CS
GPIO18	D/C
GPIO14	Reset
GPIO48	Backlight (See Selectable pins)

FT6206 Touch Screeen Pins

ESP32 S3	FT6206
GPIO8	SDA
GPIO9	SCL
NC	INT
NC	RST

Micro SD Card Pins

ESP32 S3	Micro SD Card
GPIO11	MOSI
GPIO13	MISO
GPIO12	SCLK
GPIO21	CS
GPIO47	Card Detect (See Selectable pins)

Selectable pins

JP1 and JP2 are solder pads for selecting functions.

JP1 is for selecting the micro SD card detect pin. If you need to detect inserting a card, you can solder JP1 together, and reads IO47 for card detecting. IO47 will be pulled LOW when a card is inserted.

JP2 is for selecting the TFT backlight pin. If you need to control the backlight, you can solder JP2 together, and controls IO48 for backlight control. Set IO48 HIGH to turn on backlight.

Schematic

Power management

Power includes 2 inputs: 5V USB Type C and battery, joined together with a simple power selector, which cuts of the batteries when USB is pluged in.

A 3.3V power indicator LED D1 to indicate the power status.

A 100K/200K voltage divider divide the battery voltage to IO1 BAT.

LTC4054 Lithium-ion battery charger. Charge signal is connected to IO2 CHG. LOW as charging.

ESP32 S3

Simple setup for ESP32 S3 with buttons(IO0 and EN).

Connectors

• J2: GPIO breakout connector: pin header 2x14 2.54mm.

• J3: I2C SH-1.0-4P connector compatible with Qwiic and STEMMA QT

• J4: Serial connector with IO0 and EN for easy programming.

• J8: Micro SD Card connector.

Display & Touch Panel

• J6: ST7789V display with SPI interface.

• J7: FT6206 touch panel with I2C interface.

• NMOS Q1 to control the backlight.

Mechanics

• Drawing DXF: termod-s3-v1.0.0-mechanical-drawing.dxf

• Drawing PDF: termod-s3-v1.0.0-mechanical-drawing.pdf

• 3D Model: termod-s3-v1.0.0-3d.step