• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 30 subscribers
  • Views 206 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MCT8329A: Problem with MCT8329A DRVOFF error

taewoong lee
Prodigy 25 points
Part Number: MCT8329A

Tool/software:


Hello. I made a custom board using MCT8329A.
There is a problem that the motor is not activated on some boards.

The main symptom is that DRV_OFF of GATE_DRIVER_FAULT_STATUS register is always OFF, regardless of the voltage of DRVOFF pin of IC.

Whether DRVOFF pin of IC is 0V or 3.3V, DRV_OFF of register is always OFF(1), so the motor does not operate.

When I looked at the datasheet, it seems that DRV_OFF of register changes depending on the state of DRVOFF pin of IC.

Is there a case where motor is disabled and DRV_OFF of register becomes 1 regardless of the pin voltage state of IC?

(Power error, etc.)

Currently, there are no other errors of MCT8329A other than DRV_OFF.

thank you

  • 0
    TI__Expert 6011 points

    Hi Lee,

    Thanks for the e2e. Is it possible to share your design schematics? Is the DRVOFF pin directly controlled by an MCU?

    There are no scenarios except DRVOFF pin being high that will make the DRV_OFF = 1b. Could you check if the voltage is reaching the device pin correctly?

    Regards,
    Sachin S

  • 0 in reply to Sachin S
    Prodigy 25 points

     MCT8329 Schmetics: It's almost identical to the EVM board.

    All I/O of MCT8329 is connected to MCU. (STM32 used)

    DRVOFF PIN is connected to GPIO of MCU, and I confirmed HIGH(3.3V), LOW(0V) operation of pin through MCU.

    Currently considering the following cases.

    1. Failure of IC itself

    2. DRVOFF PIN is not properly connected to PCB
    => However, if PCB and PIN are not connected, PIN should always be Low and register should always be 0.

    I will check the problem in HW more.

    Thank you.

  • 0 in reply to taewoong lee
    TI__Expert 6011 points

    Hello Lee,

    Thanks for the information. Let me know if your HW checks show up anything. The schematic looks OK.

    Regards,

    Sachin S