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DP83TD510E-EVM: T1L SPOE

Piero Yu
Expert 1050 points

Part Number: DP83TD510E-EVM
Other Parts Discussed in Thread: DP83TD510E

We have reviewed TI's DP83TD510E development board and understand that it supports IEEE 802.3cg 10BASE-T1L communication. However, our power delivery requirements differ from the standard SPoE specifications defined in IEEE 802.3cg, as our design must also meet intrinsic safety (IS) requirements.

 

Our intended product will use communication and power delivery hardware based on the IEEE 802.3cg 10BASE-T1L standard. However, we do not require SCCP-based PD detection and classification. Instead, we would like the power source to provide a fixed output directly, with one of the following voltage/power configurations:

 

1. 9.6–15 V, 0.54 W
2. 11.61–15 V, 1.1 W
3. 50 V, 57.5 W

 

In other words, we would like to maintain 10BASE-T1L communication while bypassing the standard SCCP PD detection and classification process, and directly supplying one of the above power profiles.

 

Could you advise whether this approach is feasible and what modifications would be required to the standard SPoE implementation?
  • 0
    TI__Expert 8105 points

    Hi Piero, 

    Yes, you could design a system that skips over the detection and SCCP stages of PoDL if the application is a closed proprietary system, where you know the exact power draw the link partner is expecting. However, this implementation would not adhere to the PoDL standard defined by IEEE, and will therefore not be compatible with other devices that support the standard defined PoDL. 

    The following documents go into deeper detail on how to implement a standard defined PoDL Design for the 510E device which may be useful in design. It goes over the different circuits responsible for enabling different parts of the PoDL Standard. Any sections that you do not plan to implement can be skipped, but it may also require a redesign of the overall coupling architecture and the software controlling the power transmission. We have had use cases where the application required "dumb" PoDL in which the PSE does not check for the PD at all, but simply drives 12V on the line supplying power to the connected device. For 48V> power delivery, you would simply need to design the decoupling network to handle higher voltages.

    Best,

    Vivaan