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TPS23751: TPS23751 How to set about the T2P pin.

keisuke
Intellectual 475 points
Part Number: TPS23751
Other Parts Discussed in Thread: PMP11254

Hi

I design the PoE PD circuit using a TPS23751.

The specification of our product is satisfied IEEE802.3at(Type2)

At this time, Should I set T2P pin to pass a IEEE802.3.at compliance test?

If so, Could you please tell me how to set about the T2P pin?

I checked the reference circuit(PMP11254), but I couldn't understand it.

so,I set T2P pin a open now.

Best Regards,

keisuke

  • 0
    TI__Expert 3700 points

    Hi,

    Thank you for your question. The PoE team is currently out of the office celebrating the U.S. holiday of Labor Day. Please expect a response on Tuesday, 9/3.

    Thank you for your interest in Texas Instruments PoE devices.

    Best Regards,

    Brett Colteaux

  • 0
    TI__Mastermind 21320 points

    Hello Keisuke,

    Thank you for your question. Yes the T2P pin is required for IEEE802.3at compliance. The pin is used to detect type 2 PSE's. The T2P pin should be connected to a VC with a resistor. The resistor value can be calculated with the information in section "8.2.2.13 T2P Pin Interface" of the TPS23751 datasheet: http://www.ti.com/lit/ds/symlink/tps23751.pdf

    If you accept my connect request I can send you further details in reference to PMP11254 privately. Thank you!

    Regards,

    Michael Pahl