DP83848Q-Q1: MDIO Pull-up resuster

Wataru Sakai

Prodigy 10 points

Part Number: DP83848Q-Q1

Dear TI Support Team,

I have a question about DP84838 MDIO pull-up register.

According to DP83848 datasheet, MDIO should be pulled up in 1.5komega register.

Why is pull-up register 1.5 komega? Is 1.2komega or 1.0komega available?

Thank you and best regards,

14 days ago

0 Gregory Kobyakov 13 days ago

TI__Genius 10940 points

Hi,

This resistor value has been validated to result in the best device performance. We recommend following the datasheet recommendation for the resistor.

Best regards,

Greg

0 Wataru Sakai 13 days ago in reply to Gregory Kobyakov

Prodigy 10 points

Thank you.

I understood 1.5komega is best value and another value resister also acceptable.

Best regards

0 Gregory Kobyakov 12 days ago in reply to Wataru Sakai

TI__Genius 10940 points

Hi,

We have not tested with other resistor values, so we cannot guarantee functionality when not using a 1.5kOhm resistor.

Best regards,

Greg

0 Wataru Sakai 12 days ago

Prodigy 10 points

Thank you.

OK. I understand your comment.
However, we have tested with 1.2komega registers many times without problems.
Therefore, we assess that using registers around 1.5komega has limited performance impact.

Thank you and best regards,

0 Gregory Kobyakov 11 days ago in reply to Wataru Sakai

TI__Genius 10940 points

Hi,

I see. As we have only tested with 1.5k resistors, I can only guarantee functionality at this value. It may be possible that other resistor values can work, but this is not something we have tested.

Best regards,

Greg

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DP83848Q-Q1: MDIO Pull-up resuster