Hardware

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Specifications

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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

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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.

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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.

_images/termod-s3-selectable-pins-jp2.png

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

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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

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

Connectors

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  • 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

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  • J6: ST7789V display with SPI interface.

  • J7: FT6206 touch panel with I2C interface.

  • NMOS Q1 to control the backlight.

Mechanics