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TPS6594-Q1: PMIC interrupt status errors

Mohamed Abdelrasoul
Expert 1110 points
Part Number: TPS6594-Q1


Tool/software:

Hello, 
I've PMIC chip version TPS6594-Q1, 


I'm reading Interrupt Registers at initialization, And always finding the following errors are raised:

  • "ENABLE_INT" bit  at register "INT_STARTUP".
  • "MCU_PWR_ERR_INT" bit at register "INT_FSM_ERR"
  • "LDO2_SC_INT" bit at register "INT_LDO1_2"

Steps I'm following: 

  • Init PMIC
  • Read interrupts status.
  • Clear the interrupt
  • power-off the ECU and power-on using the power supply. 

Is these errors are expected to be raised due to reset using power supply ?

And incase doing reset using PMIC, will these errors not be raised ?

Thank you

  • 0
    TI__Genius 13860 points

    Hi Mohamed,

    ENABLE_INT is expected interrupt. Others not. 

    Could you tell the full part number of the TPS6594-Q1 PMIC since that defines actual operation?

    Br, Jari

  • 0 in reply to Jari Niemela13
    Expert 1110 points

    Hi Jari, 
    Thanks for fast response, 

    full part number is TPS659414CF

    Could you please explain what's the reason for each interrupt 

    • "ENABLE_INT" bit  at register "INT_STARTUP".
    • "MCU_PWR_ERR_INT" bit at register "INT_FSM_ERR"
    • "LDO2_SC_INT" bit at register "INT_LDO1_2"

    Thank you

  • 0 in reply to Mohamed Abdelrasoul
    Expert 1110 points

    Hi Jari, 

    Could you please check, As we already blocked on this point ?

    Thank you,

  • 0 in reply to Mohamed Abdelrasoul
    TI__Genius 13860 points

    Hi Mohamed,

    ENABLE_INT" bit  at register "INT_STARTUP" is telling that ENABLE-pin is set high. Based on this info PMIC will power-up. And this is expected.

    For other two interrupts, i think there is some residual voltage (higher than 150mV) on LDO2 output when PMIC and system is re-powered. 

    So please take a scope shot from power cycle event to verify this. Include LDO2, VCCA, EN-pin at least there.

    Will device still power-up to fully functional state and nRSTOUT set high at the end? 

    Br; Jari

  • 0 in reply to Jari Niemela13
    Expert 1110 points

    Hi Jari, 


    Unfortunately these pins doesn't have test points, So i can't scope shot it. 

    Does these errors introduced because we reset the ECU using power off / power on the power supply, and this drop the voltage ?
    and if we reset using the PMIC chip, we shouldn't see these errors ?

    Thank you

  • 0 in reply to Mohamed Abdelrasoul
    TI__Genius 13860 points

    Hi Mohamed,

    Removing main power (VSYS) from PMIC has this tendency since outputs cannot be discharged controlled way when input supply is suddenly removed and brought back again. 

    Have you tested by removing supply and waiting for some time to let all rails internally discharge and then power back up? 

    Using PMIC ENABLE for power cycling should remove this issue.

    Br, Jari