• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 416 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.

TMS570LS0432: Why Vmon VCC high is higher than VCC absolute maximum

Kuerbis
Expert 4145 points
Part Number: TMS570LS0432

Hi Team,

 

Why Vmon VCC-high (2.1V) is higher than Abusolute Maximum Rating Vcc (1.43V)?

Would you please explain if there is any specific reason / propose of it?

There is a footnote that Maximum-rated conditions for extended periods may affect device reliability.

We know TI highly recommend the use of an external voltage supervisor (such as TPS65381) to monitor all voltage rails. But we want to know why the device is designed like that to use correctly?

<From SPNS186C>

 

Thanks and Best regards,

 Kuerbis

  • 0
    TI__Mastermind 21425 points
    Hello,
    Please take a look at this thread: e2e.ti.com/.../1994953

    Best regards,
    Miro
  • 0 in reply to Miro
    TI__Expert 4145 points

    Hi Miro,

     

    Thank you for giving the link of the related thread.

    It’s nice. But it doesn’t tell me Why Vmon VCC-high (2.1V) is higher than Abusolute Maximum Rating Vcc (1.43V)?

    Vmon VCC-high range is 1.40V to 2.1V. Min 1.40V is lower than Abusolute Maximum Rating Vcc (1.43V).

    We want to know the reason of this implementation.

     

    Thanks and Best regards,

    Kuerbis

  • 0 in reply to Kuerbis
    TI__Mastermind 49120 points
    Hi Kuerbis,

    As mentioned in the post that Miro referenced, the internal VMON's purpose is to ensure that the device stays under a power-on-reset condition (nPORRST = 0) until both the core and I/O power rails reach their minimum threshold for proper operation. It alleviates any ramp up dependency between the core and I/O supplies.

    The VMON does not substitute or eliminate the need for an external voltage supervisor. This is clearly stated in the datasheet as well. As you noted, the voltage monitoring thresholds for the VMON are fairly gross and even above the absolute max specification. This is not important since the external supply supervisor must assert a power-on-reset to the device before the supply exceeds the recommended operating range.

    Regards,
    Sunil