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UCD90120: DEVICE_ID is unreadable, cannot update config from Fusion

Adrianna
Prodigy 100 points
Part Number: UCD90120

Tool/software:

I have a UCD90120, but when I try to connect it to Fusion, it cannot detect the device. Using the UCD9xxx GUI, I can see that there is a device on the bus at 0x71, which is correct, but the DEVICE_ID register does not read UCD90120 as expected.

top marking:

  • 0
    TI__Genius 9320 points

    Hi, Adrianna,

    Device comes out of factory should have correct DEVICE_ID. Please contact the sale rep where you purchased the device for support.

    Regards

    Anne

  • 0 in reply to Anne Ngo77
    Prodigy 100 points

    Sorry but this response is unhelpful. Is there really no way to recover the chip? Are you able to confirm that the part is legitimate?

  • 0 in reply to Adrianna
    TI__Genius 9320 points

    Adrianna,

    Our devices come out of factory should have valid DEVICE_ID. Try the below when try to read DEVICE_ID:

    1. Enable PEC (Package Error Checking) on PMBus Host.

    2. Make sure device is the only one on the bus to eliminate communication interfered by others.

    3.  Try sending Read_Block command, to address 11d (0x0B), register code = 0xEC to see if you can communicate with device through address 11d.

    Anne