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The T-Watch 2020 hardware devices |
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- a MAX98357a
 I2S audio amplifier
- a AXP202 power management unit
- a 240x240 TFT screen controlled by a ST7789V display controller
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- a touch screen controlled by a FT6236U touch screen controlle
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- a touch screen controlled by a FT6236U touch screen controller
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- it supports IR control, a vibration motor
The pinouts can be found at https://t-watch_document-en.readthedocs.io
Here is a photo of the watch. The program shown on the display is not supplied.
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> | Software examining the T-Watch 2020 hardware
The programs described in this section are available on github: https://github.com/uraich/twatch2020_firmware/tree/main/hardware
I2C devices
There are 2 I2C buses on the t-watch. To find out which devices are connected to these buses we can use i2cScanBus[0 or 1].py.
The I2C buses use the following connections:
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I2C bus 0 |
I2C bus 1 |
| SCL |
GPIO 22 |
GPIO 32 |
| SDA |
GPIO 21 |
GPIO 23 |
Here is the result:
and here is a table relating the I2C addresses to the slave devices:
| !I2C slave address |
!I2C device |
| I2C bus 0: 0x35 |
AXP202 Power System Management |
| I2C bus 0:0x19 |
BMA432 Triaxial Acceleration Sensor |
| I2C bus 0:0x51 |
PCF8563 Real-time Clock and Calendar |
| I2C bus 1:0x38 |
FT6236U Touch Screen Controller |
The MAX9837a I2S Audio Power Amplifier
The sound system is described in a separate t-watch sound chapter. |
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--  Uli Raich - 2021-01-08 |
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