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

ttgo lilygo t-watch 2020 gpio specification axp202
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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 functionsRemoved 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.

VersionT-Watch 2020

v1

T-Watch 2020

v2

ProcessorESP32-DOWDQ6
Flash16MB
SPRAM8MB
USB-> TTL converter

Programming, debugging

CP2104
ConnectivityWiFi 802.11 b/g/n

Bluetooth 4.2 BLE/BR/EDR

Accessories
User buttonNoNo
SD card readerNoYes
Power controllerAXP202AXP202
GPSAir 530
Power supply pin (AXP202)LDO4
AccelerometerBMA423

3-axis

RTC clockPCF8563
Vibrator (motor)4?
External I2C bus (SDA / SCL)21/22
I2S audio interface

(BCK / WS / DOUT)

26/25/33?
IR (send only)134
Extension connectorNo
TFT screenST7789V
Screen resolution (HxV)240×240
Screen dimension1.54 ”
Touch screen driverFT6236
CameraNo
Interruptions
AXP2023535
Power button3737
Accelerometer3939
Touchscreen3838
Useful links
Pin definition fileGitHubGitHub
Other characteristics
Weight58.5 g
Dimensions (L, H, e) mm40 x 47.45 x 13
Li-Ion battery380 mAh, 3.7V

Standard GB/T 18287

Supplied accessoriesUSB-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.

FunctionT-Watch 2020 V1T-Watch 2020 V2
ESP32ESP32-DOWDQ6ESP32-DOWDQ6
Flash16MB16MB
SPRAM8MB8MB
Touch screen driverFT6236FT6236
TFT screen driverST7789ST7789
GPS moduleAir530
TFT Size240×240/1.54240×240/1.54
TFT RSTN/AN/A
TFT MISON/AN/A
TFT MOSI1919
TFT SCLK1818
TFT DC2727
TFT CS55
TFT BackLight1212
SDA SENSOR2121
SENSOR SCL2222
FT6236 SDA2323
FT6236 SCL3232
FT6236 RESET4AXP202 EXTEN Pin control
BMA423 Interrupt3939
FT6236 Interrupt3838
PCF8563 Interrupt3737
AXP202 Interrupt3535
GPS TX2626
GPS RX2525
WAKEUP GPS3333
IR Send134
SD MISO2
SD MOSI15
SD SCLK14
SD CS13

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 outputT-Watch 2020 V1T-Watch 2020 V2
DC2Not usedNot used
DC3ESP32 power supply. Do not deactivate !!ESP32 power supply. Do not deactivate !!
LDO1Not availableNot available
LDO2Backlight, TFT screen backlightBacklight, TFT screen backlight
LDO3TFT / TOUCHT screen
LDO4Not usedGPS module
EXTENNot usedTOUCH RESET EN

Data source

Version française

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