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Original question:

DP83867E: :

DP83867E: :

Onur Kusakoglu
Intellectual 965 points
Part Number: DP83867E

Hi,

I am trying to figure out the power budget for DP83867E. I found a document(snla241) from TI gives some idea but not covers my scenario.

I have a big FPGA so I may have thermal issues.

I would like to know typical and maximum power dissipation for both RGMII and SGMII interfaces at 85 degrees with both 2 supply and 3 supply mode with 25% and 50% channel utilization.

I am asking this specific question because I will have 25 of these Phys on my board.

Thank you in advance for your help.

Best Regards,

Onur 

 

  • 0
    TI__Genius 16030 points

    Hello Onur,

    We may not have the data that you asked for but let me check the closest that I can get for you. You are using 1Gbps mode, correct?

    --

    Regards,

    Vikram

  • 0
    TI__Genius 16030 points

    Hello Onur,

    We may not have the exact data that you asked for but let me check the closest that I can get for you. You are using 1Gbps mode, correct?

    --

    Regards,

    Vikram

  • 0 in reply to Vikram Sharma
    Intellectual 965 points

    Correct,

    As close as possible will also work.

    Thanks

  • 0 in reply to Onur Kusakoglu
    TI__Genius 16030 points
    3 supply mode,50% utilization            
      vddio ivddio vdda2p5v ivdda2p5v vdda1p0 ivdda1p0
      3.3 49 2.5 85 1 125
      1.8 25        
                 
    3 supply mode,25% utilization            
                 
      vddio ivddio vdda2p5v ivdda2p5v vdda1p0 ivdda1p0
      3.3 31 2.5 85 1 125
      1.8 19        
                 
    2 supply mode,50% utilization            
                 
      vddio ivddio vdda2p5v ivdda2p5v vdda1p0 ivdda1p0
      3.3 49 2.5 134 1 125
      1.8 25        
                 
    2 supply mode,50% utilization            
                 
      vddio ivddio vdda2p5v ivdda2p5v vdda1p0 ivdda1p0
      3.3 31 2.5 134 1 125
      1.8 19        

    Here is what you were looking for. i* is the current in mA.

    --

    Regards,

    Vikram

  • 0 in reply to Vikram Sharma
    Intellectual 965 points

    Hi,

    thank you for your reply,

    what is the junction temp? According to my thermal analysis, I will have 85 degrees Celcius junction temp at most since I have 21 Phys next to eachother this info is crucial for me.

    Is it both for RGMII and SGMII interfaces?

    Thank you for your help in advance!

  • 0 in reply to Vikram Sharma
    Intellectual 965 points

    And these are all 1Gbps like I mentioned in my previous posts?

  • 0 in reply to Onur Kusakoglu
    TI__Genius 16030 points

    Hi Onur,

    Yes the approximate numbers were for Rgmii, 1Gbps,85C.

    For Sgmii, 1Gbps, 85C power will be ~520mW and numbers will remain similar for 50%/25% utilization.

    --

    Regards,

    Vikram

  • 0 in reply to Vikram Sharma
    Intellectual 965 points

    Good morning,

    In 3 supply mode you have the current rates for 2.5V  1V voltages and also for IO voltage but I dont see the third supply(1V8) current rates.

    Please provide it also for 85 C junction 50% utilization at 1Gbps for RGMII interface

  • 0 in reply to Onur Kusakoglu
    TI__Genius 16030 points

    Hi Onur,

    Sorry that was the copy paste issue. Repasting the table with all columns again for rgmii mode, 85C, 1gbps :

    3 supply mode,50% utilization                
      vddio ivddio vdda2p5v ivdda2p5v vdda1p0 ivdda1p0 vdda1p8v ivdda1p8v
      3.3 49 2.5 85 1 125 1.8V 50
      1.8 25            
                     
    3 supply mode,25% utilization                
                     
      vddio ivddio vdda2p5v ivdda2p5v vdda1p0 ivdda1p0 vdda1p8v ivdda1p8v
      3.3 31 2.5 85 1 125 1.8V 50
      1.8 19            
                     
    2 supply mode,50% utilization                
                     
      vddio ivddio vdda2p5v ivdda2p5v vdda1p0 ivdda1p0 vdda1p8v ivdda1p8v
      3.3 49 2.5 134 1 125 1.8V 0
      1.8 25            
                     
    2 supply mode,25% utilization                
                     
      vddio ivddio vdda2p5v ivdda2p5v vdda1p0 ivdda1p0 vdda1p8v ivdda1p8v
      3.3 31 2.5 134 1 125 1.8V 0
      1.8 19            
  • 0 in reply to Vikram Sharma
    Intellectual 965 points

    In SGMII  520mW is for 2 supply or 3 supply?

  • 0 in reply to Onur Kusakoglu
    TI__Genius 16030 points

    Hi Onur,

    For Sgmii, 1Gbps, 3 supply mode : ~520mW and for 2 supply mode : ~ 550mW (similar for both 25% and 50% utilization).

    --

    Regards,

    Vikram