Datasheet

TMC4361A Datasheet | Document Revision 1.22 • 2017-JAN-12
111/230
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Read entire documentation; especially the “Supplemental Directives” on page 224.
 MAIN MANUAL 
TMC389 Stepper Motor Driver
If a TMC389 is connected to the SPI output and a microstep resolution of 256 is set,
a 3-phase stepper output for coil B can be generated. All features of TMC26x stepper
motor drivers in SPI mode are also available for TMC389.
In order to activate the SPI data transfer mode and feature set - for a
connected TMC389 3-phase stepper motor driver - do as follows:
Action:
 Set spi_output_format = b’1010 ( SPI_OUT_CONF register 0x04).
 Set three_phase_stepper_en = 1 ( SPI_OUT_CONF register 0x04).
 Set COVER_DATA_LENGTH = 0 ( SPI_OUT_CONF register 0x04).
Result:
Now, the CURRENTB and CURRENTB_SPI values are shifted by 120° towards
CURRENTA and CURRENTA_SPI – in contrast to the 90° shift of the 2-phase stepper
motors.
Configuration
for the TMC389
3--Phase
Stepper Driver