BIGTREETECH SKR 2 Control Board with 5 TMC2208 UART for 3D Printer Upgrade Based on SKR V1.4 Turbo Mianboard Compatible with Marlin RepRapFirmware Support TFT35 Display 12864 Screen (STM32F429VGT6)

• 1.【SKR 2 Control Board】 Adopt power chip AOZ1284PI, support 12-24V power input, output current peak value 4A. The instruction manual and firmware: github.com/bigtreetech/SKR-2
• 2.【Protection Circuit on Thermistor Inputs】Increase the protection circuit of the thermistor part to avoid the burning of the main control chip caused by the leakage of the hot bed or heating rod.
• 3.【Heater Protection Circuit】Increase the heating rod MOS tube protection circuit, when the main control chip is damaged or the heating rod MOS tube is damaged, the power supply of the heating rod can be cut off in time to avoid the risk of fire.
• 4.【Use the Driver】The SPI working mode and UART working mode driven by the onboard TMC, the DIAG function pin on the board, can be used by simply pulling and inserting the jumper cap. Increase the driver's anti-reversal insertion function (Marlin firmware) to avoid the occurrence of the event that the motherboard is burned due to the driver's reverse insertion.
• 5.【TMC2208 UART Driver Benefits】Motor current can be set arbitrarily through firmware; The micro-steps can be set arbitrarily through the firmware (up to 256 actual micro-steps); It is possible to combine actual and interpolated microsteps to achieve maximum torque; The firmware can dynamically switch the stepper motor between stealthChop2 and spreadCycle mode via UART; When the motor is not moving, the standby current of the motor can be dynamically reduced.

BIGTREETECH SKR 2 Motherboard Specifications: 1. The main control chip of the Cortex-M4 series STM32F429VGT6 with a frequency of 32 bits of 180 MHz is adopted, and the performance is greatly improved. 2. Supports all versions of enterprise serial screen, SPI and LCD screen: TFT35 E3 V3.0, TFT35 V3.0, TFT43 50 70, TFT24, 12864LCD, MINI12864. Support: SPI, UART, STEP/DIR TMC2209 TMC2208 TMC5160 TMC2226 TMC2130, ST820, LV8729, DRV8825, A4988 etc. 3. Increases the protective circuit of the thermistor part to prevent the burning of the main control chip due to the leakage of the hot bed or heating rod. 4. Increase the MOS circuit of the heating rod, if the main control chip is damaged or the MOS pipe of the heating rod is damaged, the power supply of the heating rod can be switched off in time to avoid the risk of fire. 5. Supports functions such as continuous printing after power failure, filament interruption detection, shutdown after printing, BLtouch (when using BL Touch, pay attention to the wiring sequence) and RGB lights, etc. 6. A filter circuit is added to the power input terminal to reduce waves and sound interference. 7. Upgrade the configuration firmware via SD card. 8. Use high-performance MOSFET to reduce heat generation. 9. Use a replaceable fuse, the replacement process is more convenient. Pack of 10. The built-in TF card slot does not open automatically (SDIO operation mode) and the U disk interface. The card does not provide SD cards. Since the SD card will damage the slot during the delivery process, you can better protect the motherboard by using your own SD card. Parameters: Size: 110 x 85 mm. Installation size 102 x 76 mm. Input voltage: DC12V-DC24V logic voltage: DC 3.3V support firmware: Marlin, reprap firmwareWiFi interface: ESP-12S, ESP-07SFan interface: 3 x CNC fans, 2 x normally open fans