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TIDA-050026-23882: Disable POE all ports function

Feng bin Su
Expert 7830 points
Part Number: TIDA-050026-23882
Other Parts Discussed in Thread: ISO1540

Hi team,

My customer would like to consult with you about the Firm PSE feature as below.

Customer would like to achieve the Disable PoE all ports function with hardware control

  • Is MSP430F523 P1.7 (disable all ports function) input pin, should be active high or low?
  •  Using P5.0 (reset) to let PSE enter into reset status, would the POE port be disable?
  • Customer would also like to consult with you whether they can connect I2C_SDAI and I2C_SDAO together on the PoE side and go through CPU with I2C isolator such as ISO1540. Would you  have any concern?  Thanks.

  • 0
    TI__Mastermind 24136 points

    Hi Ben,

    TI US is currently on holiday and will return 4/10/2023, thank you for your patience! 

    Thanks and Regards,

    Raymond Lin

  • 0
    TI__Mastermind 24136 points

    Hi Ben,

    Let me check on the "Disable all ports" function and get back to you later this week. 

    For the I2C_SDAO and I2C_SDAI connections, those can be tied together on the PoE side and then going through an isolator. Customer will need a buffer in addition to the isolator, see the schematic for our EVM below: 

    An isolator is needed for the OSS and INT pins as well (if used):

    Thanks and Regards,

    Raymond Lin

  • 0
    TI__Mastermind 24136 points

    Hi Ben,

    Currently pin P1.7 (hardware disable ports) has no functionality tied to it and is reserved for future use. Other ways to disable PoE ports is by using Opcodes from the Host Interface Protocol (in the FIRMPSE mySecure folder). You can use the follow Opcodes below depending on the desired behavior:

    Opcode 0xE: the PoE ports will still perform detection and classification, however power will not be enabled

    Opcode 0x25: disable specific multiple PoE ports (no detection, classification, or power on the specify port(s))

    Opcode 0x68: Enable or Disable one PoE ports or all ports by specifying 0xFF

    More details for each opcode can be found in the host interface protocol, let us know if you have any further questions or concerns! 

    Thanks and Regards,
    Raymond Lin

  • 0 in reply to Raymond Lin
    Prodigy 20 points

    Hi Raymond,

    I means  tied together on the PoE side and then going through an isolator as below,

    It's work normally?

    Thank you 

    Nelson Chang

  • 0 in reply to Nelson Chang
    TI__Mastermind 24136 points

    Hi Nelson, 

    SDAI and SDAO can be tied together on the PoE side before the isolator (as long as the isolator is bidirectional which the ISO1540 seems to be). 

    Thanks and Regards,

    Raymond Lin