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DRV8802: How does DRV8802 stop the motor current?

Shinji Ueda
Expert 5440 points
Part Number: DRV8802

Hi champs,

Woudl you teach me about that DRV8802 do or do not outputs motor-current following under conditions?

xVREF pin: open

DECAY pin: Low

xENBL pin: High

In my understanding, when the DECAY pin is Low, the motor current will flow even if XVREF is OPEN, HIGH or LOW, correct?

Or how does it stop the motor current?

Regards,

Shinji Ueda

  • 0
    TI__Guru** 114905 points
    Hi Ueda-san,

    Current flows based on the following:
    nSLEEP high
    nRESET high
    xENBL high
    xVREF voltage

    If xVREF is low (0V), current should flow for the blanking time as a minimum.
    If xVREF is open, current should flow for the blanking time as a minimum. After that it is hard to predict because this is a high impedance path.
    If xVREF is high (3.3V), current should flow until the voltage across the sense resistor meets Equation 1 times the relative current percentage in Table 2.
  • 0 in reply to Rick Duncan
    TI__Expert 5440 points
    Hi Rick-san,

    Thank you very much.
    Could you please teach me how do I stop current flowing?

    Regards,
    Shinji Ueda
  • 0 in reply to Shinji Ueda
    TI__Guru** 114905 points
    Hi Ueda-san,

    To stop current in one winding set AENBL or BENBL low.
    To stop current in both windings, do one of the following:
    1) set both aENBL and BENBL low
    2) set nRESET low
    3) set nSLEEP low.
  • 0 in reply to Rick Duncan
    TI__Expert 5440 points
    Rick-san,

    Thank you very much!

    Regards,
    Shinji Ueda