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DP83825I: Questions for Crystal.

Satoshi Yone
Expert 3600 points
Part Number: DP83825I
Other Parts Discussed in Thread: DP83825

Hi, Team,

We have questions for the crystal.

1. Is feedback resister not required? Please let us know the inside PU/PD register value of the IC.

2. The XI pin is 3.3V, right?

Best Regards,
Satoshi Yone

  • 0
    TI__Mastermind 18425 points
    Hi Satoshi-san,

    Are you asking about the current limiting resistor, R1? It depends on the the power handling capacity of the crystal. A high value resistor which is usually connected across XI and XO pin is not required for DP83825.

    XI pin is tied to VDDIO. This is important when external oscillator is used. The oscillator should be connected to the same voltage as VDDIO of the PHY.

    -Regards
    Aniruddha