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DRV8899-Q1: CTRL5 Control Register

TEZUKA FUMIKA
Prodigy 150 points
Part Number: DRV8899-Q1

EN_SR_BLANK bits are recommended to be set to "1" when controlled in Smart tune Dynamic Decay mode.
How do I use it? Also, please tell me why.

  • 0
    TI__Guru 56650 points

    Teauka-san,

    CTRL5 register is a reserved register. Where do you find "EN_SR_BLANK" bit in DRV8899-Q1?

    Regards,

    Wang

  • 0 in reply to Wang5577
    Prodigy 150 points

    sorry. I made a mistake in the part number. The correct name is DRV8889A.Regards,

  • 0 in reply to TEZUKA FUMIKA
    TI__Guru 56650 points

    Teauka-san,

    Set "EN_SR_BLANK" =1 when controlled with slow-slow or either smart tune decay modes. 

    Either smart tune decay could have slow-decay operating. Additional blanking time is beneficial in case the stepper motor has excessive parasitic coil capacitance. Also, the blanking time can avoid the switching noise on the current sensing circuit during the power FET turn-on. 

    For example: when  SLEW_RATE [1:0]=00b, the slew rate is 10v/us. With the highest input voltage 45V, the turn-on time is about 4.5us. 5.6us blanking time can avoid the switching noise in to the current sensing circuit.

    Regards,

    Wang Li