BIGTREETECH CB1 + TFT35 SPI (+ UART)

Two sample wiring diagrams for connecting the BTT CB1 SoC to a BTT TFT35 SPI display via GPIO (SPI + I2C), as well as to an MCU (mainboard) via GPIO (UART).

Diagram

%3 CB1 CB1 BIGTREETECH GPIO female 40-pin +5V 4 GND 6 PC7 7 TX 8 GND 9 RX 10 PC14 11 PC12 13 PC10 15 PH7 19 PH8 21 PH6 23 BTT CB1 V2.2 DISPLAY CABLE DISPLAY CABLE RIBBON 9x 24 AWG (0.25 mm²) 10.0 cm   CB1:15:PC10     YELLOW:SOC_TP_IRQ     TFT35:2:SCL CB1:13:PC12     GREEN:SOC_Backlight     TFT35:3:SDA CB1:11:PC14     BLUE:SOC_TOUCH_CS     TFT35:4:RS CB1:7:PC7     WHITE:SOC_LCD_CS     TFT35:5:NSS CB1:23:PH6     ORANGE:SOC_SCK     TFT35:6:SCK CB1:19:PH7     GREEN:SOC_MOSI     TFT35:7:MOSI CB1:21:PH8     YELLOW:SOC_MISO     TFT35:8:MISO CB1:6:GND     BLACK:GND     TFT35:9:GND CB1:4:+5V     RED:+5V     TFT35:10:+5V   A ribbon cable works well in this scenario. CB1:e--DISPLAY CABLE:w CB1:e--DISPLAY CABLE:w CB1:e--DISPLAY CABLE:w CB1:e--DISPLAY CABLE:w CB1:e--DISPLAY CABLE:w CB1:e--DISPLAY CABLE:w CB1:e--DISPLAY CABLE:w CB1:e--DISPLAY CABLE:w CB1:e--DISPLAY CABLE:w SERIAL CABLE SERIAL CABLE WIRE 4x 24 AWG (0.25 mm²) 10.0 cm   CB1:9:GND     BLACK:GND     MCU:1:GND CB1:8:TX     GREEN:TX     MCU:3:RX CB1:10:RX     YELLOW:RX     MCU:4:TX     RED:+5V       Serial over UART. CB1:e--SERIAL CABLE:w CB1:e--SERIAL CABLE:w CB1:e--SERIAL CABLE:w TFT35 TFT35 BIGTREETECH JST-XH female 10-pin 1 IORQ 2 SCL 3 SDA 4 RS 5 NSS 6 SCK 7 MOSI 8 MISO 9 GND 10 +5V BTT TFT35 SPI V2.2 MCU MCU JST-XH 6-pin 1 GND 2 NC 3 RX 4 TX 5 NC 6 +5V An Ender-7 stock mainboard's display connector is used in this example. DISPLAY CABLE:e--TFT35:w DISPLAY CABLE:e--TFT35:w DISPLAY CABLE:e--TFT35:w DISPLAY CABLE:e--TFT35:w DISPLAY CABLE:e--TFT35:w DISPLAY CABLE:e--TFT35:w DISPLAY CABLE:e--TFT35:w DISPLAY CABLE:e--TFT35:w DISPLAY CABLE:e--TFT35:w SERIAL CABLE:e--MCU:w SERIAL CABLE:e--MCU:w SERIAL CABLE:e--MCU:w

Bill of Materials

Id Description Qty Unit Designators Manufacturer
1 Cable, RIBBON, 9 x 24 AWG 10.0 cm DISPLAY CABLE
2 Cable, WIRE, 4 x 24 AWG 10.0 cm SERIAL CABLE
3 Connector, GPIO, female, 40 pins 1 CB1 BIGTREETECH
4 Connector, JST-XH, 6 pins 1 MCU
5 Connector, JST-XH, female, 10 pins 1 TFT35 BIGTREETECH

Notes

Ensure that your specific hardware revisions are compatible with the pinout shown here. Also note that the MCU example shown for UART here may only be applicable to the Ender-7 stock mainboard, as its display port/connector could be directly used for UART/serial communication. As for the cables, most cables/wires should work fine here, so long as the distances are kept relatively short.