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C2000WARE-MOTORCONTROL-SDK: BOOSTXL-DRV8323 Setup

Sasha Gold
Prodigy 143 points
Part Number: C2000WARE-MOTORCONTROL-SDK
Other Parts Discussed in Thread: BOOSTXL-DRV8323RS, LAUNCHXL-F280025C, DRV8323

When going through the Universal Motor Control Project and Lab User's Guide section 2.2.5 (BOOSTXL-DRV8323RS Setup) it describes a few modifications which I'm hoping someone can provide an explanation for:

1. Why are pins J3-29, J3-30 of F280025C disconnected from BOOSTXL-DRV8323RS?

2. Why are pins J4-4 and J4-18 connected using a jumper wire? What is the purpose of connecting, as per the guide, DRV_SCS and SPI_STE?

And a follow up question, if I'd like to connect a second BOOSTXL-DRV8323RS to my LAUNCHXL-F280025C (using connector site 2), do I have to repeat these modifications?

Regards,

  • 0
    TI__Guru** 110290 points
    Sasha Gold said:
    1. Why are pins J3-29, J3-30 of F280025C disconnected from BOOSTXL-DRV8323RS?

    To disable the IDRIVE and VDS which are connected to the SCLK and SDI of DRV83232RS. You may take a look at the schematic of the BOOSTXL-DRV8323RS and the datasheet of the DRV8323. 

    Sasha Gold said:
    2. Why are pins J4-4 and J4-18 connected using a jumper wire? What is the purpose of connecting, as per the guide, DRV_SCS and SPI_STE?

    Connect the SPI_STE pin for the nSCS of the DRV, the GPIO on J4-18 is not STE pin of the SPI.

    Sasha Gold said:
    And a follow up question, if I'd like to connect a second BOOSTXL-DRV8323RS to my LAUNCHXL-F280025C (using connector site 2), do I have to repeat these modifications?

    Yes.

  • 0 in reply to Yanming Luo
    Prodigy 143 points

    Thanks for the reply, I just have a few follow up questions.

    Yanming Luo said:
    To disable the IDRIVE and VDS which are connected to the SCLK and SDI of DRV83232RS. You may take a look at the schematic of the BOOSTXL-DRV8323RS and the datasheet of the DRV8323. 

    Oh I see that now, but it looks like for DRV8323RH those pins are IDRIVE and VDS, so why does the Universal Lab User Guide instruct those pins to be bent for both DRV8323RH and DRV8323RS?

    Yanming Luo said:

    Connect the SPI_STE pin for the nSCS of the DRV, the GPIO on J4-18 is not STE pin of the SPI.

    Where can I find the pin out of the BOOSTXL-DRV8323RS? The pin configuration is clear for the chip itself but I can't find it for the booster board.

    The Lab user guide says J4-4 and J4-18 connect DRV_SCS to SPI_STE, is that not correct?

    Regards,

  • 0 in reply to Sasha Gold
    TI__Guru** 110290 points
    Sasha Gold said:
    why does the Universal Lab User Guide instruct those pins to be bent for both DRV8323RH and DRV8323RS?

    DRV8323H and DRV8323RS share the same hardware board by populate or not populate the related resistors.

    Sasha Gold said:
    The Lab user guide says J4-4 and J4-18 connect DRV_SCS to SPI_STE, is that not correct?

    It's correct. J4-4 and J4-18 on BOOSTXL-DRV8323RS, please refer to the schematic or guide of the BOOSTXL-DRV8323RS.

  • 0 in reply to Yanming Luo
    Prodigy 143 points
    Yanming Luo said:
    DRV8323H and DRV8323RS share the same hardware board by populate or not populate the related resistors

    I don't understand, why do they both require the pins to be disconnected when they are different between RH and RS?

    Yanming Luo said:
    It's correct. J4-4 and J4-18 on BOOSTXL-DRV8323RS, please refer to the schematic or guide of the BOOSTXL-DRV8323RS.

    But you said before:

    Yanming Luo said:
    the GPIO on J4-18 is not STE pin of the SPI.

    Are these not contradictory? Why do these pins need to be connected?

  • 0 in reply to Sasha Gold
    TI__Guru** 110290 points

    Just an option, enable the user to use different GPIO for these two kits without changing the GPIO assignment and configuration.

    No, need to use a GPIO that can be configured to SPI STE pin. The GPIO linked to J4-18 of LaunchXL-F280025C can be used to SPI STE, so the DRV_SCS must be connected to the GPIO on J4-4.