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Using sleep pin for DRV8834

Suhaas Koparde
Prodigy 50 points
Other Parts Discussed in Thread: DRV8834

Hello,

I am using DRV8834 driver along with a stepper motor. I want to get a reference position before starting an operation. I checked the datasheet and found that 'sleep' pin can be used for this by putting the driver to power down mode and pulling it out of it. This will drive the motor to the 'home state' at an angle of 45. I tried doing this but was unable to get the 'home' state. The data sheet for DRV8834 also states that for every power up, the motor drives to the 'home' state but I am unable to get this as well. Can you please explain the term 'home' state and its reference to the electric angle mentioned in the datasheet? Can you please clarify whether the motor will come to a defined position at every power up or when coming out of sleep mode?

Secondly, to achieve this 'home' state, is the mechanical fitment also requires to be considered? If yes, what should be the position for fitting the motor?

Thanks in advance for your help.

Suhas

  • 0
    TI__Mastermind 26065 points

    Hi Suhas,

    "Home" state here means a position within one Full step, it is actually the 45 electric degree. Assuming when motor is released (no current), the motor is aligned to a 0 electric degree direction. So just when the motor is excited, the motor will immediately align the the mid point of one Full step (90 electric degree).

    But this one Full step can be any mechanical angle for a 1.8 mechanical degree stepper. There are 200 Full steps per one full turn. There is no absolute "Home" position here.

    Best regards,

  • 0 in reply to Wilson Zuo
    Prodigy 50 points
    Thanks Wilson for your quick reply.

    Best Regards,
    Suhas