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DRV8343-Q1: SPI communicate no response.

Marsh Cai
Expert 5185 points

Part Number: DRV8343-Q1

Tool/software:

Hi Teams,

0_DRV8343SEVM DVDD NO Voltage.PPTX

We are evaluating the DRV8343 with EVM and Customer MCU. But found cannot use SPI to communicate with DRV, and seems DVDD short to GND. 

Can you kindly help to guide us to continue the evaluation?

All details are listed in the attachments.

BRs,

Marsh

  • 0
    TI__Genius 12231 points

    Hi Marsh, 

    Thank you for your question.  

    Would you be able to help provide the customer MCU datasheet? 

    I am looking over the PPT and want to confirm if there is any mismatch in circuit requirements.  

    Best Regards,

    -Joshua

  • 0 in reply to Joshua Maize
    TI__Expert 5185 points

    Hi Joshua,

    Customer cannot give us the MCU board.

    But we have confirmed that MCU board is ok. Currently what we have seen is the supply voltage VM=12V & VREF=3.3V, Enable=5V, are ok. But DRV8343-Q1 haven't start up. DVDD=0, VCP=0.

    Is that normal if the DVDD short to GND when DRV8343 shut down.

    BRs,

    Marsh

  • 0 in reply to Marsh Cai
    TI__Genius 12231 points

    Hi Marsh, 

    Thank you for the response.  

    I notice the sensing circuitry for VM/VSENX is not disconnected as well-  Does the new MCU not measure the device's voltages,  and is this leading to an reported supply undervoltage condition? 

    Further, DVDD should not be shorted to GND but will output 0v when disabled. Can we check the  connection and voltage on the DVDD-AGND capacitor to ensure that component is in place? 

    Lastly,  I do believe there is an error existing in the MCU setup, as the device should output/register a DVDD-Undervoltage fault condition when DVDD falls below 2.9V. 

    Can you again ensure that all connections to the onboard MCU have been disconnected,  and reconnected (including the GNDs) to the new MCU? 

    Best Regards,

    -Joshua