Operates at 3.3V, so if using with a 5V MCU, include logic level shifters on the data lines to prevent damage. The module doesn't have a 3.3V regulator so you must power with 3.3V.
This is a write only device and doesn’t need the SPI MISO line hooked up. The module also doesn’t bring the CS pin out to the interface which helps to lower the pin count. Unfortunately, it can’t be used with other SPI devices on the same bus simultaneously.
Connecting the display via a 7 pin header.
1 x 7 Header
GND – Connect to system ground. This ground needs to be in common with the MCU.
VCC – Connect to 3.3V. This can come from the MCU or separate power supply.
SCK – Connects to SPI SCK
SDA – Connect to SPI MOSI (Data)
RES – Reset for the ST7789 LCD controller. Normally HIGH, pull LOW to reset
DC – Data / Command. Determines type type of data being sent to the display. LOW = Command, HIGH = Data
BLK – Backlight Control. If left unconnected, the backlight is always on. Pull LOW to turn off
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