11. Increase the distance between the driving chip and the components to avoid the trouble caused by the heat
sink;
12. Add protection device to the thermistor interface;
13. 5V power supply with BLtouch, TFT and RGB interfaces is optional;
14. The driver shares a physical UART port, which saves IO and enhances stability.
Motherboard parameters:
Appearance size: 100.75 * 70.25mm
Installation size: check BTT SKR MINI E3 V2.0-SIZE.pdf for details
Layer: 4 layers
MCU: ARM Cortex-M3 STM32F103RCT6
Power input: DC 12 / 24V
Logic voltage: 3.3V
Motor driver: UART mode of onboard TMC2209;
Motor drive interface: XM, YM, ZAM, ZBM, EM
Temperature sensor interface: TH0, THB, 2 channels 100K NTC (thermal resistance)
Display: 2.4 inch TFT, 3.5 inch TFT, Ender3 original LCD12864 screen, etc.
PC communication interface: mini-USB-B type, easy to plug and unplug, communication baud rate 115200
Support file format: G-code
Recommended software: Cura, Simplify3D, pronterface, Repetier-host,
Makerware
Description of motherboard indicators
After power on the mainboard:
3.3v red light is power indicator: the red light is on, indicating normal power supply;
Status red light is the Status indicator: when updating the firmware, it will flicker.
D8 green light is the HB status indicator for the hotbed: it is always on when heated, and it goes out when not heated.
D6 green light is the indicator light of E0 status of the heating tube: it is always on when heating, and it will go out
when not heating.
D10 green light for CNC fan FAN0 status indicator: it lights up when turned on, and goes out when turned off.
D7 green light for CNC fan FAN1 status indicator: it lights up when turned on, and goes out when turned off.
Communication between motherboard and PC
The motherboard communicates with the PC (Windows system) through the [USB] interface. Before communication,
the driver needs to be installed to be used normally. Driver acquisition method: Website:
https://github.com/bigtreetech Download the file named:
mapleDrv to install it.
Interface Instruction
1. Motherboard Size Diagram
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