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DRV8812: Is there any sequence when the nSLEEP asserted

NAOKI AOYAMA
Guru 11215 points
Part Number: DRV8812

Hello,

Our customer drive a stepper motor by using the DRV8812.

Below is their drive sequence.

CW --- STOP ---- CCW

The customer assert the nSLEEP when they stop a motor.

When the customer de-assert the nSLEEP and drive a motor for

CCW direction, a motor current flow over regulation in sometime.

The customer always input ENBL high.

Is this condition cause to flow over current?

Best Regards,

Naoki Aoyama

  • 0
    TI__Expert 4435 points
    Hello Aoyama-san,

    Thank you for your question, we will look into this. Could you please provide specs for VMA/VMB and motor spec customer is using?
  • 0 in reply to Luis Riveros
    Guru 11215 points
    Hello Luis-san,

    Thank you for your reply.

    The customer's setting as follows,

    VM=24V
    full scale current = 390mA
    non-circular 1/2 stepping operation

    The motor current is under control at CW direction.
    The customer stop the motor with nSLEEP assert.
    Next, the customer drive the motor with CCW direction,
    the motor current flow as over 1A. It is not under control.

    Best Regards,
    Naoki Aoyama
  • 0 in reply to NAOKI AOYAMA
    TI__Expert 4435 points

    Hello Aoyama-san,

    Thank you for the information provided.

    You mentioned:

    The customer always input ENBL high.

    - This is acceptable

    The customer stop the motor with nSLEEP assert.

    - This is acceptable

    Driver should be able to operate properly under described conditions. Can you please provide scope captures if possible? Is the overcurrent event only during the transition from stop to CCW direction?

  • 0 in reply to Luis Riveros
    Guru 11215 points
    Hello Luis-san,

    Thank you for your reply.
    I have scope captures already.
    But these captures include customer's technical know-how.
    So, I will send you the scope captures by E-mail through TI sales person
    in this account.

    Thanks,
    Naoki Aoyama