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TPS23861: PSE test failure

Terry Hu
Intellectual 2550 points
Part Number: TPS23861

Hi Team,

When customer is doing compliance test with TPS23861. Class 4 count failure occurred.

Could you kindly advise what may cause this failure?

Thanks.

 

Best regards,

Terry

  • 0
    TI__Mastermind 31066 points

    Hi Terry, 

    Is the customer running Sifos using AT or BT standards? Can you share the settings on PSE tab of Sifos? 

    Can you also share what version of Sifos customer used when testing? The information can be found at the bottom of the report page like below:

    Thanks and Regards,

    Raymond Lin

  • 0 in reply to Raymond Lin
    TI__Intellectual 2550 points

    Hi Raymond,

    Thanks for your reply.

    Customer is running Sifos using AT standards. Version 5.304.

    Sifos Version as below:

    Regards,

    Terry

  • 0 in reply to Terry Hu
    TI__Mastermind 31066 points

    Hi Terry,

    Is the customer running the PSE in autonomous mode (no I2C host)? If so, by default TPS23861 will always send a second classification pulse to indicate it can support Type-2 (Class 4) power level. To disable the second classification pulse, customer can write to register 0x21 to disable that second pulse.

    How much power does the customer want the PSE to output? If it's Class 0-3 (Type 1) then Sifos will expect only one classification pulse. If it's Type-2 (Class 4) then Sifos will expect two pulses. Based on the test failing for 2 pulses for Class_4_Count I assume this is because Sifos is only expecting one pulse. 

    Thanks and Regards,

    Raymond Lin

  • 0 in reply to Raymond Lin
    TI__Intellectual 2550 points

    Hi Raymond,

    Beside I2C write to register, is there any hardware solution to disable the second pulse?

    Best regards,

    Terry

  • 0 in reply to Terry Hu
    TI__Mastermind 31066 points

    Hi Terry, 

    The classification pulse is sent from the PSE (TPS23861) by default during handshake/negotiation, the second classification pulse can only be disabled via register write to change its configuration. Can you share the PSE settings/configuration the customer wants? What is the maximum power/class do they want to achieve and how did they configure PSE settings on Sifos? 

    Thanks and Regards,

    Raymond Lin

  • 0 in reply to Raymond Lin
    TI__Intellectual 2550 points

    Hi Raymond,

    The PSE settings/configuration customer wants is type 1, class 3.

    The the maximum power is 15W.

    The configure PSE settings on Sifos as attachments.

    Best regards,

    Terry

  • +1 in reply to Terry Hu
    TI__Mastermind 31066 points

    Hi Terry,

    Since Sifos is expecting a Class 1/Type 3 PSE, TPS23861 (without any configuration) will fail since by default it will support up to Type-2/Class 4 power level, which is indicated by the second classification pulse. As mentioned before, since they only want the PSE (TPS23861) to only output up to Class 3 power level, they will need to disable the second classification pulse via register write to 21h (Two-Event Classification Register) and set the channel(s) to 00b. 

    Thanks and Regards,

    Raymond Lin