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DRV8353RH-EVM: DRV8353 SPI Not Responding

Louis Ashford
Prodigy 20 points
Part Number: DRV8353RH-EVM
Other Parts Discussed in Thread: DRV8353

Tool/software:

I’ve designed a piggyback board (segment shown) that drops onto the DRV8353RH-EVM to test my DRV8353 control firmware. I’m using the DRV on the EVM for this test setup, since the layout is very well done.

However, I’m not receiving any responses from the DRV via SPI—SDO remains high at all times. The EVM’s nFAULT LED is not on, and the 3.3V rail is present as expected.

My SPI command format, timing, and register read/write procedures are correct, and the same firmware works on a separate DRV test board (not an EVM).

The EVM is powered with 24V and draws approximately 10 mA when the DRV is enabled.

Do you know why the DRV might not respond to SPI commands in this configuration?

  • 0
    TI__Mastermind 23566 points

    Hey Louis,

    Thank you for the question. I have assigned the thread to a team member to provide feedback.

    Best,

    Akshay

  • 0 in reply to Akshay Rajeev Menon
    TI__Expert 4735 points

    Hi Louis,

    You mentioned that you are using the DRV8353RH-EVM, this would mean that the device populated on this EVM would be the DRV8353RH Which is a hardware variant, meaning SDO and SDI lines pins are not on this variant. These SPI pins are instead replaced with MODE and IDRIVE pins on this device and therefore probably have pull up/down resistors in these paths somewhere on the EVM where you are expecting the SDO and SDI lines to be routed. 

    This is my interpretation of what you have shown but I could be misunderstanding your set up.

    Let me know and we can continue debugging.

    Thank you,

    Joseph

  • 0 in reply to Joseph Ferri
    Prodigy 20 points

    Joseph,

        Yes, this did resolve my issue. I ordered the other EVM, and the SPI is all working as expected. I'm not sure how I overlooked that when I ordered the first one.

        Thanks again for your quick response. It was most appreciated.

        Louis