Shenzhen Big Tree Technology Co., Ltd.  
BIGTREETECH  
  
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CONTENTS 
Revision History ................................................................................................... 4 
Product Profile ..................................................................................................... 5 
Feature Highlights ........................................................................................ 5 
Specifications ............................................................................................... 6 
Dimensions ................................................................................................... 8 
Peripheral Port ..................................................................................................... 9 
Connector Diagram ...................................................................................... 9 
Pinout Diagram ............................................................................................. 9 
Connection Description .................................................................................... 10 
USB Power Supply ..................................................................................... 10 
Stepper Driver ............................................................................................. 10 
STEP/DIR (STANDALONE) Mode ........................................................ 10 
UART Mode of TMC Driver .................................................................. 12 
TMC Driver SPI Mode .......................................................................... 12 
TMC Driver DIAG (Sensorless Homing) ............................................. 12 
Driver Voltage Selection ...................................................................... 13 
Install the Core Board via BTB Connection .............................................. 13 
Voltage Selection for CNC Fan .................................................................. 14 
100K NTC or PT1000 Setting ...................................................................... 15 
BLTouch Wiring ........................................................................................... 15 
Wiring between LCD Screen and EXP1+EXP2 ......................................... 16 
RGB Wiring .................................................................................................. 16 
Filament Sensor Wiring .............................................................................. 17 
40 Pins GPIO ............................................................................................... 17 
DSI/CSI Wiring ............................................................................................. 18 
Proximity Switch Wiring ............................................................................. 18 
Raspberry Pi CM4 Usage Instructions ............................................................. 20