TPS2373: Bt mode class identification

Hi Jeff,

Thanks for your question. TPS2373 can not identify between Class-5 and -6, or Class-7 and -8.

TPH, TPL, BT are mainly for the PD indicating what type of PSE it is connected. For the PSE aspect, a type-3 PSE can fit for both Class-5 and Class-6; a Type-4 PSE can fit for both Class-7 and Class-8. So there is no split of Class-5 and -6, or Class-7 and -8.

Best regards,

Diang

Hi, Diang,

Very appreciate your confirmation.

Does TI have PoE PD solution to identify those classes? 5 vs. 6, 7 vs. 8? 

Or this is industrial consensus, only identify type 3 and type 4? 

Many thanks,

Jeff

Hi Jeff,

Thanks for your reply.

Does TI have PoE PD solution to identify those classes? 5 vs. 6, 7 vs. 8?

- We current do not have PD products can identify 5 vs. 6 in TPH/TPL/BT pins.

Or this is industrial consensus, only identify type 3 and type 4? 

- I am not 100% sure about the solutions from other vendors, but the PD in general tells the PSE it connected by counting the number of classicization events, but both Class5 and Class6 have the same 4 events for example when connected with a Type-3 or -4 PSE. For PD itself, it should know what class it is and be configured with proper CLSA and CLSB resistors. The information PD does not know is what PSE type it is connected (or whether the PSE cannot support the full PD power and needs to go into power demotion mode), which will be presented in TPH/TPL/BT pins.

Best regards,

Diang