The TMC429 is equipped with a serial interface (SPI) to the MCU. It has an integrated ramp generator and pulse generator. For control of stepper drivers via SPI one can use the TMC429 internal RAM look-up table (LUT). The interfaces of the TMC429 to the stepper motor drivers is either STEP/DIR or SPI. The integrated voltage regulator allows operation within a pure 5 V environment without the need of an additional external 3.3 V. The internal power-on-reset (POR) performs a reset on power-on.