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UCD90120A: UCD_INT asserted without any logged faults

Jim Tsan
Prodigy 115 points
Part Number: UCD90120A

Dear sir,

We dumped all the status register when UCD_INT_L is asserted as following and found two symptom

  1. Empty logged fault (EAh)
  2. Vout fault bit asserted in STATUS_WORD(79h) but nothing asserted in STATUS_VOUT(7Ah)

Do you have any idea of this?

--

// [79h] STATUS_WORD
root@ubuntu:~# ipmitool i2c bus=2 0x68 0x2 0x79
 01 80

// [EAh] LOGGED_FAULTS
root@ubuntu:~# ipmitool i2c bus=2 0x68 0xf 0xea
 0e 00 00 00 00 00 00 00 00 00 00 00 00 00 00

// [F3h] MFR_STATUS
 04 00 00 00 00

// [7Ah] STATUS_VOUT
root@ubuntu:~# ipmitool i2c bus=2 0x68 0x1 0x7a
 00

// [7Bh] STATUS_IOUT
root@ubuntu:~# ipmitool i2c bus=2 0x68 0x1 0x7b
 00

// [7Dh] STATUS_TEMPERATURE
root@ubuntu:~# ipmitool i2c bus=2 0x68 0x1 0x7d
 00

// [7Eh] STATUS_CML
root@ubuntu:~# ipmitool i2c bus=2 0x68 0x1 0x7e
 00

  • 0
    TI__Guru 65860 points

    Hello

    BIT 15 of STATUS_WORD is to tell that there are some VOUT issue in the system. but it does not specify which rail/page has the VOUT issue.

    VOUT_STATUS is a paged command. if you have more than one page defined in the configuration, you have to send PAGE command(0x00) with index before issuing VOUT_STATUS to query each page.

    Regards

    Yihe

  • 0 in reply to yihe
    Prodigy 115 points

    Hi Yihe,

    Although I did not switch page offset to check Vout status of every power rail but I think it should be recorded by the logged fault register which is able to represent fault of GPIs and all rails.

    The logged faults register is also empty, why??

    Thanks

    Jim

  • 0 in reply to Jim Tsan
    TI__Guru 65860 points

    Hello

    VOUT does not mean it has fault, Warnings of the rail can also set the bit and trigger the alert which does not create fault log.

    have you tried to use GUI to read all this to confirm your software? If not, I would recommend this to ensure.

    Regards

    Yihe