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TPS23861: I2C issue

Darren Yang
Expert 2000 points
Part Number: TPS23861

Hi，could you help check below question and give some suggestions for me，tks！

The TPS23861 can be semi-automatically controlled by I2C，however，whether TPS23861 can be design for ON or OFF by use I2C from MCU how to design? If the control is not controlled, automatic recovery of the POE can be resumed ,how to design ?Is it possible to detect the power output of each channel via I2C and send the data to the master? 4 *TPS23861 cascade is how to do?

  • 0
    TI__Genius 9230 points
    Hi Darren,

    I have notified our PSE expert.

    - Tom
  • 0
    TI__Intellectual 1695 points
    Hi Darren,

    TPS23861 can be designed for ON/OFF or auto mode through MCU. Our TPS23861EVM is just the case as you want, here is the link for your reference:
    www.ti.com/.../TPS23861EVM-612

    Basically, you can use the 19h register to power on or off the port in semi-auto or manual mode. If you want to recover to auto mode when the MCU doesn't control the TPS23861, first the auto bit in 11h register has to be set to 1 and a power cycle (Vpwr drops below UVLO and then rises up to normal operation voltage) should be implemented to the device so that it can work in auto mode.

    You can monitor the port power by reading the port voltage and current in registers 30h-3Fh to calculate the power in MCU via I2C.

    For 4 cascaded devices, you should connect all the SCL and SDA pin to the I2C bus. And the AOUT pin is connected to AIN pin of the next device except that the AIN of first device and AOUT of last device should be floated. After this you can use daisy chain to program the I2C address of 4 devices. You can refer to P36 in datasheet.

    Thank you so much.
    Best Regards
    Jack Chen