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DRV8873-Q1: Pin termination

Akihiro Hirata
Expert 6210 points
Part Number: DRV8873-Q1

Hello team,

Please let me know about the appropriate pin termination.

The below is my understanding, but if it's wrong please let me know the appropriate termination.

1. If IPROPIx is not monitored, IPROPIx pin can be open.

2. If nFAULT is not monitored, nFAULT pin can be open.

3. If the user send the motor control signal via the SPI (EN_IN1 bit and PH_IN2 bit), EN/IN1 pin and PH/IN2 pin can be open.

Thanks for your support.

Regards,

Hirata

  • 0
    TI__Guru** 114905 points

    Hi Hirata-san,

    1. If IPROPIx is not monitored, IPROPIx pin can be open.


    IPROPI1 and IPROPI2 can be connected together with a single resistor. Please note section 7.3.1.3 of the datasheet.The selection of the external resistor should be such that the voltage on the IPROPI pin is less than 5 V.Therefore the resistor must be sized less than this value based on Equation 1. The range of current that can be monitored is from 100 mA to 10 A assuming the selected external resistor meets the calculated value from Equation 1.

    The resistor should be selected such that the voltage on IPROPIx is less than 5V.

    2. If nFAULT is not monitored, nFAULT pin can be open.

    Yes, nFAULT can be open.

     

    3. If the user send the motor control signal via the SPI (EN_IN1 bit and PH_IN2 bit), EN/IN1 pin and PH/IN2 pin can be open.

    Yes, EN/IN1 and PH/IN2 can be open. There are internal pulldowns on the EN/IN1 and PH/IN2 to hold the inputs low when left floating.

    Please note the SPI_IN bit in IC1 must also be set.