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DP83867CS: XI-XO application

Koshi Ninomiya
Expert 6215 points

Part Number: DP83867CS

Dear Team,

My customer is designing the DP83867CS application circuit, and has some questions as follows,

Q1: XI-XO application
My customer uses a crystal between XI-XO.
Datasheet shows the crystal oscillator circuit. There is not a 1Mohm between XI and XO.
     image.png

However, DP83867EVM has a 1Mohm between XI and XO.
   image.png

When do they need this 1Mohm between XI and XO ?

Q2: Unused pins
What is the proper way to handle unused pins?
What is the internal pull-up/down resistor value?

Q3: INT pull-up resistor value
What is the proper resistor value of INT pull-up?
Is 10kohm pull-up resistor OK?

Best Regards,

Koshi Ninomiya

  • +1
    TI__Mastermind 44735 points

    Hi Ninomiya-san,

    Thank you for your query. I am answering for Greg who is OoO for the week and will resume support upon his return.

    1) 1MEG resistor is common technique for xtal circuits for faster startup. This is dependent on xtal and use of this will need input from xtal vendor.

    2) Unused pins can be left DNC

    3) Per datasheet, 2.2k PU can be connected to VDDIO.

    Sincerely,

    Gerome