• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 183 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.

DP83867IS: Two-Supply vs Three-Supply

Darren (FAE)
Expert 5483 points
Part Number: DP83867IS

Question1:
Is the only difference between two-supply and three-supply operation the power consumption?

Question2:
Does the device have an integrated LDO that drops the 2.5V rail to 1.8V for certain internals? (this is why two-supply has larger power consumption?)
If not, what voltage do the internals, that run at 1.8V with external 1.8V applied, run at, when the device is operated in two-supply mode?

Question3:
When operating in two-supply mode, does anything register/setting-wise need to be changed? Or do you simple just need not power the 1.8V pin?
I did a quick check on the DS and didn't see anything, but I might have missed something.

My customer doesn't have experience with two-supply mode, and needs to do some risk assessment before switching.

Thanks!

Darren

  • 0
    TI__Mastermind 18425 points

    HI Darren,

    From a performance perspective, power consumption is the only difference between two supply and three supply operation.

    The device does have an internal LDO that generates the required 1.8V during two supply operation. When 1.8V is supplied externally during power up the PHY automatically by-passes the internal LDO and draws current from the external 1.8V rail.

    The register settings are the same between two and three supply operation. Only hardware change is required to remove the external 1.8V  connection to the PHY.

    -Regards

    Aniruddha