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DRV8834: Full Step Mode issue

Amit Patil32
Prodigy 50 points
Part Number: DRV8834

Hi,

This is regarding DRV8834 step selection Mode.

We were using M1=1 & M0=1 mode(1/16 micro-step mode) .Due to application requirement ,shifted to M1=1 & M0=Z mode(1/32 micro-step mode)

At step frequency 1KHz, Motor works as intended with 1/32 micro-step mode,1/16 micro-step mode,1/8 micro-step mode.

but for full step mode ,motor behavior is different.If you give 1 pulse, it moves 1  step.If you give 10 pulse,it moves 1 or 2 steps. 

Tried the same by providing step signal through Function Generator.If you give 1 pulse, it moves 1  step.If you give 10 pulse,it moves 1 or 2 steps.

In both case behavior is same.

Voltage at M1,M0 for full step mode is 2 to 3mV. Also tried by shorting M1 & M0 directly to ground.

Connections are as below

Microcontroler GPIO Pins (IOH=-4mA) >>>>>>1K resistor>>>>M0 (DRV8834)

Microcontroler GPIO Pins (IOH=-4mA) >>>>>>1K resistor>>>>M1 (DRV8834)

For Z (high Impedance),Microcontroler GPIO Pins are configured as input-Open drain without Pull-up & Pull Down

For High/low,Microcontroler GPIO Pins are configured as output

 

While experimenting on step signal through function generator,we reduced step frequency to 50Hz.

Motor works as intended at full step mode.If you give 1 pulse, it moves 1  step.If you give 10 pulse,it moves 10 steps.

Same is observed upto 60Hz.

Above 70 Hz ,motor behavior is as mentioned earlier.

7624.SH2141-5541.pdf

Stepper Motor supports 32microsteps. Motor datasheet (SH2141-5541) is attached.

Request you to assist us on this misbehavior of motor.

  • 0
    TI__Guru** 114905 points
    Hi Amit,

    This could be due to the resonant frequency of the stepper motor. Performing a web search for "stepper motor resonance" will provide much information on the subject.

    Your motor manufacturer may also be able to provide the resonant frequency range of the motor.

    If it is resonance, using microstepping through the resonant range or quickly accelerating through the range is the recommended method to avoid it.