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CCS/DRV8821: what is the minimum stepping angle in DRV8821?

Part Number: DRV8821
Other Parts Discussed in Thread: DRV8880, DRV8824

Tool/software: Code Composer Studio

Hi ,

i have certain doubts about the motor driver ic DRV8821 because i'm started to work with a printer.From datasheet i noticed the application 'printer'.But there have an index table(page no 13) which shows the stepping angle from full step to 1/8,as per that table the minimum stepping angle is 11.25(xUSM = 11).Is it correct ?If not then what is the minimum stepping angle ?How can i achieve it by coding?.I need minimum stepping angle or rotating angle for quality printing that's why i concern with the angle of rotation.

  • Hi Aju,

    The DRV8821 stepping angles are fixed by the internal indexer. Any of the stepper motors that have an internal indexer have fixed stepping angles.

    The minimum step angle of the DRV8821 is 11.25 degrees electrical angle. Please note many steppers move 1.8 degrees per mechanical full step.

    So in the case of a 1.8 degree/full step mechanical stepper, 11.25 degrees is ~.225 mechanical degrees. ((11.25 electrical degrees/ (90 electrical degrees/mechanical full step)) * 1.8 mechanical degrees/full step)

    If you need more than than, the DRV8824/25 can provide up to 1/32 microsteps. The DRV8880 can provide up to 1/16 with AutoTune, and the DRV8881E with external control of the VREF pins can provide higher levels.