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Original question:

TPS6594-Q1: TPS65941515RWERQ1：EEPROM Unlock failed

TPS6594-Q1: EEPROM not unlocking even after writing sequence

Rafael Gonzalez Zuniga
Prodigy 20 points
Part Number: TPS6594-Q1

Tool/software:

I am having a similar issue where EEPROM will not unlock.

I am trying to write the unlock sequence but every time I write a value into USER_EE_CTRL_1, the register goes back to 0x00 and EEPROM does not unlock even after writing the entire sequence.

Is there anything else I need to do to access EEPROM?

Thank you.

  • 0
    TI__Genius 13201 points

    Hello Rafael,

    Can you give me the context of how/why you are trying to unlock the EEPROM?

    In short, there are two possibilities that I can see being the issue:

    1. The unlock sequence as noted below must ne done according to the note, I2C with immediate readback would cause the sequence to fail

    2. The device has been attempted to be reprogrammed and was locked at the end of the sequence

    Best Regards,

    Nicholas

  • 0 in reply to Nicholas McNamara
    TI__Prodigy 20 points

    I finally got it to work. I forgot to set the register read to off so whenever I would write the sequence it would reset to 0x00

    After setting it to off and inputting the sequence it worked

    Thank you.