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TPS23861: schematic check

Tommy Tzeng
Genius 5780 points
Part Number: TPS23861
Other Parts Discussed in Thread: TPS54160, , TPS23882

Hi Sir,

i have a customer design the dump switch for 4-port IEEE802.3at application, there seem no problem after we checked.

if have any problem,please kindly let us know and learn, thanks for your great support.

dgs-1008p_20210722_PSE controller_Microcontroller review.pdf

  • +1
    TI__Mastermind 41770 points

    Hi Tommy, just a couple comments regarding the schematic:

    I didn't see the power supply for the 3.3V rail; however, be sure for your solution that the RESET pin is pulled LOW while the power rails power up past their UVLO.

    1k ohms SDA/SCL seems low. Usually it is a 4.7k ohms resistor. Might be pulling more current than necessary there.

    Other than these, the TPS233861 schematic looks good to me. Thanks! 

  • 0 in reply to Darwin Fernandez
    Genius 5780 points

    Hi Sir,

    got it.

    3.3V is provide by TPS54160 to 23861 and MSP430, customer power tree is not show in this schematic, thanks.

    thanks for your help.

  • 0 in reply to Darwin Fernandez
    Genius 5780 points

    Hi Sir,

    may we know another request?

    does the internal register of TPS23861 can support the following LED indicator of D-LINK RFQ? 

    if not, there any relevant design or suggestion cna provide to us?

  • +1 in reply to Tommy Tzeng
    TI__Mastermind 41770 points

    Hi Tommy,

    The TPS23861 has wide range of interupts and status registers that can be read to accomodate these. I do recommend taking the TPS23861EVM and its GUI along with a PoE PD EVM up to Class 4 and putting the PSE EVM under these condition described in your table. Then you can see in the GUI how these registers change such that you will know which registers to monitor to set the logic of your LEDs. 

  • 0 in reply to Darwin Fernandez
    Genius 5780 points

    Hi Sir,

    the customer want to know whether TPS23861 can meet the requirement of attached file? thanks for your great help.

    i already confirm that some function can meet.

    複本 PoE SPEC UM_20210802.xlsx

  • 0 in reply to Tommy Tzeng
    TI__Mastermind 41770 points

    Hi Tommy, i looked through the excel sheet and the open items are all either system level software implementations or system level hardware implementations. For the TPS23861, from a software prospective, the product page has very simple reference code for boot up, negotiation, and power up. So customer will need to make the system level software to do the power port management. 

    The closest solution i recommend for a more complete system software PSE solution is using TPS23882 with firmPSE. FirmPSE is our GUI implemented system PSE software solution with power port management. This would be the best start for your customer. Note FirmPSE is not compatible with the older TPS23861.

    https://www.ti.com/tool/TPS23882EVM-084

     From a hardware prospective, it looks like customer is asking for lightning surge protection. I recommend looking at the reference design below that passes surge up to 6kv. Since this is a system level solution, you can use the same protection circuits with the TPS23882 design above.

    https://www.ti.com/tool/TIDA-01411