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DRV8313 IN and EN difference

xzhang45
Prodigy 140 points

What is the difference between pin IN and EN? The truth table shows the same. But I've seen different behavior driving a PWM signal to one of them and tie the other HIGH and vise versa.

Thanks.. XZ

  • 0
    TI__Expert 4435 points

    Hello XZhang45,

    Pins IN1 to IN3 are the channel inputs for each phase of the BLDC motor (Ex. PWM input signal)

    Pins EN1 to EN3 enable the input channels when driven high which also enables the outputs OUT1 to OUT3 accordingly.

    Thank you.

  • 0 in reply to Luis Riveros
    Prodigy 140 points
    No. Imagine the following 2 scenarios:

    1. Connect PWM to IN1 and tie HIGH to EN1;
    2. Connect PWM to EN1 and tie HIGH to IN1.

    What do you predict? I can tell you they behave differently.
  • 0 in reply to xzhang45
    TI__Expert 4435 points

    Dear xZhang45,

    Yes, they will behave differently because you are driving the device different ways. Refering back to my first post, for case #1, Connect PWM to IN1 and tie HIGH to EN1.


    In this case, the OUT1 will be high and low following the PWM of IN1 when EN1 is high.

    For case #2, Connect PWM to EN1 and tie HIGH to IN1


    In this case, OUT1 will be high only when EN1 and IN1 are both high. OUT1 will be low when EN1 is high and IN1 is low. OUT1 will be high Z when EN1 is low independent of IN1 being high or low.

    In case number 1, current path will be circulating through the FET. Case number 2, current path will be circulating through the internal diode of the FET.

    I hope this helps you understand better. Thank you very much.