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Original question:

TPS6594-Q1: TPS65941515RWERQ1：EEPROM Unlock failed

TPS6594-Q1: TPS65941515RWERQ1：EEPROM Unlock failed part.2

?? ??
Prodigy 90 points
Part Number: TPS6594-Q1
Other Parts Discussed in Thread: TPS6594EVM

This is an additional question to a previous question.

（TPS6594-Q1: TPS65941515RWERQ1：EEPROM Unlock failed - Power management forum - Power management - TI E2E support forums）


As a result of investigating the cause, it was found that a voltage was applied to PMIC（VOUT_LDO1） from the outside.
I'm guessing that this is the reason why the write could not be performed normally.
Is it normal for the PMIC to not be able to write due to the reverse voltage being applied to the PMIC output?

best regards

  • 0
    TI__Expert 4480 points

    Hi,

    The connection to VOUT_LDO1 could have caused the EEPROM to not unlock. The TPS6594-Q1 checks for residual voltage on the output pins on startup. Depending on when this voltage is applied during the device start up, the Built-In Self-Test (BIST) could fail due to this voltage. More information about the residual voltage check can be found in the Residual Voltage Checking section of the TPS6594-Q1 datasheet.

    Regards,
    Megan

  • 0 in reply to Megan Singer
    Prodigy 90 points

    Dear　Megan

    Thank you for your reply.
    I understood your answer.
    I have one additional question.
    I was able to communicate with GUI3 even when residual voltage was applied to VOUT_LDO1 in the I2C connection, but is it because the I2C power was supplied from the TPS6594EVM?
    ※The connection method is the same as the previous thread.
    　I am using GUI3 to connect the TPS6594EVM and our prototype board via I2C communication, and write to the PMIC of our prototype board.


    best regards

  • +1 in reply to ?? ??
    TI__Expert 4480 points

    Hi,

    The PMIC can still connect to the GUI when the BIST fails. As long as there is a valid connection from the computer to the MSP432 on the EVM, and a valid connection from the MSP432 on the EVM to the external PMIC, the GUI can still connect. You can even read the BIST fail interrupt through the register map of the GUI. The device may not function properly when the BIST fails, but the Register Map page should still be accessible.

    Regards,
    Megan