The TFT Gizmo uses SPI to receive image data. That means at least 5 pads are used - clock, data in, tft cs and d/c. An additional pin is used as a backlight control. These are already determined because of the bolt-on design. The TFT Gizmo also has a built-in audio amplifier and 2 JST connectors.
- VOUT - power input, connect to 3-5VDC.
- GND - power and signal ground. Connect to your power supply and microcontroller ground.
- 3.3V - power input, connected to the 3.3V output of the Circuit Playground. Also, if you have a need for a clean 3.3V output, you can use this! It can provide at least 100mA output.
The display used on the TFT Gizmo is a 1.54" IPS TFT ST7789 display.
- SCK - this is the SPI clock pin, its an input to the chip. This is connected to A4 or SCL.
- MOSI - this is the Microcontroller Out Serial In pin, for data sent from your processor to the TFT display. This is connected to A5 or SDA.
- CS - this is the chip select pin, drop it low to start an SPI transaction. Its an input to the chip. This is connected to A6 or RX.
- DC - this is the TFT SPI data or command selector pin. This is connected to A7 or TX.
- LITE - this is an input used to externally control the backlight. This is connected to A3.
There is a speaker connector with a mono 2.5 Watt Class D audio amp connected to A0 or AUDIO - that's the DAC output on the SAMD21 and SAMD51. It is good for many simple sound effects or musical output.