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TPS23880: Manual Startup & NVRAM

user5823974
Prodigy 40 points
Part Number: TPS23880

I have a board spin utilizing the TPS23880. I currently have not yet set up my firmware to program the SRAM. I do seem to be able to read/write the various general purpose registers, but have not been able to turn activate any of my output PoE ports.

Is there a way to manually turn on a port without loading the SRAM? I have tried setting registers 0x12 to 0x55 to put all of the ports into Diagnostic/Manual mode. I have also set register 0x13 to 0x0F to disable the DC disconnect. Finally, I set register 0x19 to 0x0F to power up all of the ports. This sequence does not seem to result in power being supplied to the ports.

Have I missed something, or is there no way to test this without programming the SRAM?

  • 0
    TI__Genius 15685 points
    Hi user5823974,

    Do you have any load connected to port? If not, you will need to disable DC disconnect. In order to disable the DC disconnect, you will need to write 0x00 to register 0x13. After changing this, you should see the port to be turned on after sending push button on command to 0x19. Thanks.

    Best regards,
    Penny