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Original question:

TPS23881: Measure Power Consumption with TPS23881

TPS23881: Measure Power Consumption with TPS23881

Jesus Manuel Llaiqui Florez
Prodigy 40 points
Part Number: TPS23881
Other Parts Discussed in Thread: TPS2373

Tool/software:

Good day, community,

I have successfully connected a device using the demo code in automatic mode, configured for 4-pair operation. As shown in the image, both ports used in 4-pair mode are being measured:

  • Is it possible to combine both values and treat them as a single port? Or are the measurements taken independently for each port?
  • Can power measurements be obtained from the ports?
  • While in automatic mode, which I am currently using for testing, is it possible to trigger an interrupt and turn off a port for a specific amount of time, or does this require switching to semi-automatic mode?

Best regards,
Jesus

  • 0
    TI__Mastermind 37021 points

    Hi Jesus,

    Thanks for reaching out! Sorry that PoE team is quite busy recently. I will try to get back to you in 5 business days.

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    TI__Mastermind 37021 points

    Hi Jesus,

    Thanks for your patience!

    • Is it possible to combine both values and treat them as a single port? Or are the measurements taken independently for each port?

    - The voltage and current registers are for each channel. Four pairs use 2 channels so you will see two values. You may need to use a MCU (like MSP430 or MPSM0) to add both channel's values.

    • Can power measurements be obtained from the ports?

    - You can check register 54h for power measurement

    • While in automatic mode, which I am currently using for testing, is it possible to trigger an interrupt and turn off a port for a specific amount of time, or does this require switching to semi-automatic mode?

    - If there is some issues (like Pcut, disconnection...) in the turned on port, the port will be turned off and re-handshake is needed. In manual mode, you can interrupt the port with more flexibility by writing though I2C.   

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    Prodigy 40 points

    Hello Diang Xing,
    Thank you for your responses. My main goal is to control the powering on and off of the ports, specifically to turn off a port for a period of time and then turn it back on. For now, I just need to progress to that point and test its functionality. If you could give me any advice or suggest any changes to make in the semi-automatic demo code, I would be very grateful.

    Best regards,
    Jesus

  • 0 in reply to Jesus Manuel Llaiqui Florez
    TI__Mastermind 37021 points

    Hi Jesus,

    Thanks for update. I will get back to you in 5 business days.

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    TI__Mastermind 37021 points

    Hi Jesus,

    Since you can use I2C. You can try below actions to turn on/off the port

    To turn on the port:

    Write 12h as 11 auto mode. Then the port with valid PD should be turned on

    To turn off the port:

    Write 19h with POFF = 1, PWON = 0

    Return on the port:

    Write 19h with POFF = 0, PWON = 1

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    Prodigy 40 points

    Hi Diang Xing,

    I was able to turn off a specific port in semi-automatic mode using the function tps_SetDevicePowerOff(). To re-enable the port after a set period, is it necessary to perform classification again, or could I simply use the tps_SetDevicePowerOn() function without reclassification? What would be the correct procedure if I want to turn off a specific port for a user-defined time and then turn it back on so that the device connected to the port becomes operational again?


    Best regards,

    Jesus

  • 0 in reply to Jesus Manuel Llaiqui Florez
    TI__Mastermind 33936 points

    Hi Jesus, 

    Diang is currently out of office and will return Nov 12th, apologies for any inconvenience. 

    Thanks and Regards,
    Raymond Lin

  • 0 in reply to Raymond Lin
    TI__Mastermind 37021 points

    Hi Jesus,

    Thanks for your patience. It is recommended to turn on the port after detection + classification if you do not an immediate action. This is a safer way than direct turn-on. Meanwhile, most of PD has PSE-PD handshake indication functions (for example, TPH/TPL/BT pins in TPS2373 PD), and these pins need the classification process to make the indicators correct. 

    Best regards,

    Diang