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Original question:

MCT8316Z: MCT unable to drive motor sometimes

MCT8316Z: MCT8316Z

Jayam Srivastava
Prodigy 90 points
Part Number: MCT8316Z

Hi there,

In my pcb, which uses MCT8316Z spi version, along with a stm32g0 controller; I am getting NPOR bit set (error) while register read in the starting and hence the n-Fault pin is getting set and hence I am unable to drive the motor as well.

I have physically verified the voltage at the VM pin of MCT, and it is coming as it should be (24 V in my case), but still it is giving same error.

Any idea of what might cause this issue will be helpful.

Thank you.

  • 0
    TI__Mastermind 18916 points

    Hi Jayam, 

    Thanks for reaching out via e2e.

    Some of our team members are currently out of office on business travel, so it may take a few days to get back to you with an answer on this question. 

    Best Regards, 
    Andrew 

  • 0
    TI__Mastermind 18450 points

    Hi Jayam,

    Thanks for reaching out to us with the question! The NPOR bit is a little different than the other bits, in that this bit is set to 1 to indicate that no power-on-reset condition is detected on VM, and it is set to 0 to indicate that a power-on-reset condition was detected. Therefore during normal operation this bit should be set to 1. If you find that the nFAULT pin is still low even after powerup, I would look to see what other bits are set to 1 within the IC_Status_Register that could be an indicator as to why nFAULT is low. You can also try clearing faults through the CLR_FLT bit or by a reset pulse on nSLEEP.

    Regards,

    Anthony Lodi