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DRV8313: Questions on Termination

Mitchell
Expert 4915 points
Part Number: DRV8313

Hi Team,

My customer is working on a new design using the DRV8313 and has a few questions regarding termination of unused pins. The datasheet doesn't seem to provide guidance on these specific questions, so I'd like to get your team's help on the below:

1. We will not use the nFAULT, nCOMPO, COMPN, and COMPP pins. Should these be left open or tied to ground?

2. Is there any risk in tying nRESET high all the time? We do not anticipate reaching any of the fault parameters in our application

3. Is there any risk in tying nSLEEP low all the time?

Thanks,
Mitchell

  • 0
    TI__Guru 65450 points

    Mitchell,

    Thanks for posting on the MD forum!

    The reason the datasheet doesn't discuss these points is because it's a quite uncommon request.

    I do not recommend leaving nFAULT unconnected, even if no faults are expected, it is good to include at least a way to connect to this pin for debug purposes. Include a zero ohm resistor that can be DNP by default in case we need to check for faults.

    COMPN and COMPP should be grounded if unused, nCOMPO should be floated.

    nRESET can be tied HIGH yes but you will lose the ability to reset the part without cycling VM. If any fault (even unintentional) occurs the driver power will need to be cycled. I recommend an option for connecting this to the MCU in case it is needed.

    Tying nSLEEP low will force the part into sleep mode permanently. You can tie it HIGH but then you lose the ability to shut down the driver without removing power. 

    If the system is shut down by removing power there will likely be device damage or unintended faults if not checked carefully. I recommend connecting nSLEEP, nRESET, or both so that they can be used to shut down the motor before power is pulled.

    Regards,

    -Adam