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UCD90120A: i2c is not answering

Bruno Valinoti
Prodigy 20 points
Part Number: UCD90120A

I'm working with a board that uses an UCD90120A as voltage monitor. Until three days ago the board was working fine, yesteraday when I powered the board up, all the voltage domains which the UCD90120A handles stays off. No power good output goes up and the PMB_Alert output is active all the time.

I've tryied to communicate with the IC by i2c, but I get only errors when reading. When listing all the devices on the i2c bus the UCD90120A seems to be with the right adress, but the registers queries are giving error.

The readings are being made in linux with i2cget and the connected devices query with i2cdump commands.


Regards,


Bruno

  • 0
    TI__Guru 58020 points
    is that possible to hook your board to TI USB-TO-GPIO Dongle and open Fusion GUi to see whether it can talk to device?
    Can you send a PAGE command to device and share us a waveform with this command?
    thanks
    yihe
  • 0 in reply to yihe
    Prodigy 20 points

    At this moment we don't have a TI USB-TO-GPIO Dongle to hook in our board, we have purchased one but times to import a product in Argentina are around three weeks and we can't wait so long.

    Is there any I2C PMBUS/SMBUS library to communicate with the UCD90120A? just to know if the IC is alive.

    Thanks in advance.

    Bruno

  • 0 in reply to Bruno Valinoti
    TI__Guru 58020 points
    library requires USB-To-GPIO dongle.
    Is the 3.3 supply good? i just want to make sure that UCD is power-up properly.

    Can you send a PAGE command to device and share us a waveform with this command? If Device ACKed, it is lived otherwise it has some communication issue.

    thanks
    Yihe