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TPS653860-Q1: Reconfigure issue of the LDO1 after enabled by the NVM

Zoltan Veghelyi
Prodigy 95 points
Part Number: TPS653860-Q1

Tool/software:

Dear Support,
I faced with a problem related to the PMIC TPS65386xx-Q1 reconfigurability. The PMIC is on our controller card not on an evaluation module.
I can reconfigure most of the LDOs and all PLDOs wiht the microcontroller via SPI.
But the LDO1 I can't. (that is the only LDO what enabled by default)
The default configuration is 3V3 and the desired would be 5V.
Datasheet says cannot reconfigure LDOx in enabled state. But as soon I switch it off via SPI the PMIC activates the reset line and after ~ 2sec all Power rails are switched off.
I have tried to separate the reset line from the controller, but the effect is the same after 2sec all power lines are gone. Possibly the PMIC goes into error state.
I have checked the config registers and couldn't find where LDO1 error detection can be turned OFF.
The LDO 1 is not connected to a microcontroller in our system so in theory it could be switched off.
Although the LDO1 is connected to TRACK pin on PMIC but the tracking function is not enabled in the PMIC.
Please give me some hints if that LDO1 reconfiguration is possible at all? Or it must be enabled by the NVM default to get 5V as output.
Thank you very much
Zoltan
Identification of the PMIC on our board.
  • 0
    TI__Guru* 77651 points

    Thank you for your inquiry. US and Europe TI offices are closed on April 18th. You will receive a response early next week. Thank you for your patience!

    Regards,

    Katie

  • 0
    TI__Expert 4950 points

    Hi Zoltan,

    You Should be able to reconfigure the LDO voltage if you turn off the LDO, reconfigure the LDO and then turn the LDO back on. You can turn off the OV and UV error detection by writing 0xFF to registers 0x34 and 0x38. If you only want to turn off the monitoring for LDO 1 then you will need to write 1 to BIT0 of each respective register. Let me know if you need more guidance. If you do, please send me the values that are in registers 0x00, 0x01, and 0x02.

    Best,

    Michael Hernandez