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Original question:

TPS2388: SDA lines stuck low.

TPS2388: what are all the register need to enable the power port in PSE controller.

vignesh M6
Intellectual 300 points
Part Number: TPS2388


Hi,

In TPS2388 PSE controller power port MOSFET is not enable, while connecting the valid PoE PD connection.

How to enable the power port? it is required to enable the port from the register level?

  • 0
    TI__Mastermind 41800 points

    Hi Vignesh,

    TPS2388 does not have autonomous mode (pass FET turns ON after valid detection/class). Instead it has semi auto and manual mode where you need to do to a power on command from the GUI or host to turn on the port. This is described on 8.6.22 of the datasheet.

    If looking to do autonomous functionality, I recommend looking at TPS23881

  • 0 in reply to Darwin Fernandez
    Intellectual 300 points

    Hi sir,

    Thanks for your reply. 

    I need information about what are all the register should need to enable the power port after valid detection.

    We are configured PSE controller in Semi auto mode(12h) and we enabled all the bits in power enable register(19h). this only configuration is enough for enable the power port?

  • 0 in reply to vignesh M6
    TI__Genius 15685 points

    Hi Vignesh,

    Please take a look at TPS2388EVM-612 user's guide and we have a clear flowchart of what needs to be set(the minimum registers you need to set are: 0x12:set operating mode, 0x13:enable DC disconnect, 0x14 enable detection/classification, 0x19:turn on ports after a valid PD is connected). We also have MSP430 reference code available in TPS2388 product folder to reference to. Thanks.

  • 0 in reply to Penny Xu
    Intellectual 300 points

    Thanks you,

    Now enable all PoE ports. Thanks for your support sir.