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DRV8889-Q1: register step and Dir bits work exactly as the pins?

Part Number: DRV8889-Q1

Can you confirm that the spi_step can be used to do everything the the external step pin can do, also with the dir pin I can just use the spi_dir bit setting instead?

Reason is to save IO lines in the design , if I can do it through the spi bus it will be easier from a pcb point of view.

  • Hello!

    Yes, the internal SPI step and dir bits are designed to exactly mimic the same control as if the pins were set externally with GPIOs.

    The only limitation would be the speed at which the SPI bus can update the STEP register.  DIR is usually not an issue, so we see some customers use SPI for direction, but external hardware pin for STEP.