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MSP430F6746: How to detect problems with AUXVCC3 of MSP430F6746

da
Expert 2780 points
Part Number: MSP430F6746

Hi,

Since customers' questions are coming, I want advice.
The device is MSP430F6746.

Q1
Is there a way to know from the outside when there is a problem with AUXVCC3?

Q2
Is there a way to know by software when there is a problem with AUXVCC3?
(Is it possible to use AUX3RST of RTCTCCTL0?)

Regards, DA

  • 0
    TI__Expert 5200 points
    Hello DA,
    If there is no AuxVCC3, 32KHz crystal oscillator is not enabled and it will not support ACLK if configured.
    Now if you have written your UCS where you are checking faulat flags, you will get XT1 fault flag set..

    Regards,
    Vikas Chola
  • 0
    TI__Expert 5200 points
    Hello DA,
    AUX3RST bit indicates that there is power cycle at AuxVCC3 so if there is any surge/unwanted signal on AUXVCC3, making this supply from 3V to GND for sometime, This bit gets set... You can utilize this in software to indicate the same.

    Regards,
    Vikas Chola
  • 0 in reply to Vikas Chola
    Expert 2780 points
    Thank your reply.

    I checked the operation with the device.
    It became as follows.

    AUXVCC3 : off -> on ... AUXRST : 0 -> 1
    AUXVCC3 : on -> off ... AUXRST : 1 -> 0

    With the program, even without clearing AUX 3 RST,
    When AUXVCC3 is turned OFF, it is cleared.

    Is it OK?

    Check Code...

    while(1) {
    if( RTCTCCTL0 & AUX3RST )
    {
    P2OUT |= BIT1;
    }
    else
    {
    P2OUT &= ~BIT1;
    }
    }
    > Turn AUX VCC 3 ON / OFF manually.


    Regards,
    DA
  • 0 in reply to da
    TI__Expert 5200 points
    Hello DA,
    As per documentation , It is correct behavior. This bit is in AUXVCC3 Power domain and whenever There is power cycle on AUXVCC3, It gets RESET to 1. If AUXVCC3 is not there, it is expected to Zero only. If you wish to use this in your application, Clear it manually and further if you find it is set, It will indicate a power cycle on AUXVCC3.

    Regards,
    Vikas Chola

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