BIGTREETECH SKR 3

Shenzhen Big Tree Technology CO.,LTD .
BIG TREE TECH
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Content
Content ......................................................................2
Revision History .............................................................5
1. Introduction ..............................................................6
1.1 Features .............................................................6
1.2 Specification ........................................................7
1.3 Firmware .............................................................8
1.4 Dimensions ...........................................................8
2. Peripheral Port ...........................................................9
2.1 Connector diagrams ...................................................9
2.2 Pinout diagram .......................................................9
3. Connection description ...................................................10
3.1 USB power supply ....................................................10
3.2 Stepper driver ......................................................10
3.2.1 STEP/DIR(STANDALONE) mode .....................................10
3.2.2 UART mode of TMC driver .......................................12
3.2.3 TMC driver SPI mode ...........................................12
3.2.4 TMC driver DIAG(Sensorless Homing) ............................12
3.3 USB and CAN mode ....................................................13
3.4 Voltage selection for CNC Fan .......................................13
3.5 100K NTC or PT1000 setting ..........................................14
3.6 BLTouch wiring ......................................................14
3.7 Auto power off (Relay V1.2) wiring ..................................15
3.8 Power loss recovery (UPS 24V V1.0) wiring ...........................15
3.9 RGB wiring ..........................................................16
3.10 Filament sensor wiring .............................................16
3.11 Display wiring .....................................................17