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.