• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 100 subscribers
  • Views 253 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.

C6678 sudden Power Down

Fabio Sacco
Prodigy 30 points

Hello everybody,

i have a question about C6678 power down sequence

The datasheet declares that a correct power down sequence is the power up one in the reverse order. This is true and applicable in a "clean" case but its difficult (impossible? ) to implement in a sudden , unpredictable, primary power supply failure.

What happens in this case, any concern about C6678 safety?

Paragraph 7.7.2 states that POR should be immediately asserted. Is it mandatory and does it guarantee that no trouble will occure to the device?

Thanks

Fabio

  • 0
    TI__Mastermind 42545 points

    Hi Fabio,

    The questions for power down sequencing are covered in the following post.

    http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/t/140558.aspx

    The statement in section 7.2.2 is intended to advise that your design should have a power supervisor circuit that will assert PORz if any of the power rails unexpectedly fails.  PORz will help to protect the IOs of the device if, for example, the core voltage is present and the IO voltage is not.  Note that if a power rail fails, all of the power rails to the device should be disabled.  PORz will prevent an overcurrent condition while the rest of the supplies are shut down but should not be used as a long term solution.  As state in the second paragraph of 7.2.2:

    "A system power monitoring solution is needed to shut down power to the board if a power supply fails. Long-term exposure to an environment in which one of the power supply voltages is no longer present will affect the reliability of the device. Holding the device in reset is not an acceptable solution because prolonged periods of time with an active reset can also affect long term reliability."