DIY Projects

T-Watch 2020. ESP32 TTGO smart watch pinout and specifications

ttgo lilygo t-watch 2020 gpio specification axp202

The T-Watch 2020 is a real connected watch built around the ESP32 SoC (ESP32-DOWDQ6) that can be freely programmed with C ++ Arduino, MicroPython or Blockly code. The design is very close to the Apple Watch. Unlike other T-Watches, no expansion slot is available. It is therefore impossible to connect sensors or actuators via the I2C bus.

 

Specifications for a new version are available on LiLyGo’s official GitHub repository but does not appear to be released yet at the time of writing. In case of error, do not hesitate to use the comments to report an error

2020 T-Watch Specifications

The technical specifications of two versions are detailed on LiliGo’s Github repository.

Currently, it looks like version 2 is still in the development stage. If we look at the comparison table below, version 2 should make the following changes:

New functions Removed functions (to be confirmed)
  • Air530 GPS
  • Micro SD card reader via SPI bus
  • IR emitter moved to pin 4
  • Vibrator
  • I2S audio interface

The comparative table of the two versions of T-Watch 2020.

Version T-Watch 2020

v1

T-Watch 2020

v2

Processor ESP32-DOWDQ6
Flash 16MB
SPRAM 8MB
USB-> TTL converter

Programming, debugging

CP2104
Connectivity WiFi 802.11 b/g/n

Bluetooth 4.2 BLE/BR/EDR

Accessories
User button No No
SD card reader No Yes
Power controller AXP202 AXP202
GPS Air 530
Power supply pin (AXP202) LDO4
Accelerometer BMA423

3-axis

RTC clock PCF8563
Vibrator (motor) 4 ?
External I2C bus (SDA / SCL) 21/22
I2S audio interface

(BCK / WS / DOUT)

26/25/33 ?
IR (send only) 13 4
Extension connector No
TFT screen ST7789V
Screen resolution (HxV) 240×240
Screen dimension 1.54 ”
Touch screen driver FT6236
Camera No
Interruptions
AXP202 35 35
Power button 37 37
Accelerometer 39 39
Touchscreen 38 38
Useful links
Pin definition file GitHub GitHub
Other characteristics
Weight 58.5 g
Dimensions (L, H, e) mm 40 x 47.45 x 13
Li-Ion battery 380 mAh, 3.7V

Standard GB/T 18287

Supplied accessories USB-C charging cable

Bracelet

The 3.7V Li-Ion battery with a capacity of 380mAh is very easy to replace by opening the back of the watch case. No special tools are required.

T-Watch 2020 ESP32 pinout

Here is the pin spotting of the ESP32 of the two versions of T-Watch 2020.

Warning, the identification of v2 under development may still change.

Function T-Watch 2020 V1 T-Watch 2020 V2
ESP32 ESP32-DOWDQ6 ESP32-DOWDQ6
Flash 16MB 16MB
SPRAM 8MB 8MB
Touch screen driver FT6236 FT6236
TFT screen driver ST7789 ST7789
GPS module Air530
TFT Size 240×240/1.54 240×240/1.54
TFT RST N/A N/A
TFT MISO N/A N/A
TFT MOSI 19 19
TFT SCLK 18 18
TFT DC 27 27
TFT CS 5 5
TFT BackLight 12 12
SDA SENSOR 21 21
SENSOR SCL 22 22
FT6236 SDA 23 23
FT6236 SCL 32 32
FT6236 RESET 4 AXP202 EXTEN Pin control
BMA423 Interrupt 39 39
FT6236 Interrupt 38 38
PCF8563 Interrupt 37 37
AXP202 Interrupt 35 35
GPS TX 26 26
GPS RX 25 25
WAKEUP GPS 33 33
IR Send 13 4
SD MISO 2
SD MOSI 15
SD SCLK 14
SD CS 13

AXP202 Power Controller Pinout

The AXP202 power controller allows peripherals to be powered independently from the ESP32.

Entirely controlled via the I2C bus (and integrated into the TTGO.h library), the AXP202 is used to power the watch peripherals without going through the ESP32.

AXP202 output T-Watch 2020 V1 T-Watch 2020 V2
DC2 Not used Not used
DC3 ESP32 power supply. Do not deactivate !! ESP32 power supply. Do not deactivate !!
LDO1 Not available Not available
LDO2 Backlight, TFT screen backlight Backlight, TFT screen backlight
LDO3 TFT / TOUCHT screen
LDO4 Not used GPS module
EXTEN Not used TOUCH RESET EN

Data source

Version française

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