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Linux/AM5718: issue of PMIC configuration for AM571x Board

Nikunj Patel
Expert 1870 points
Part Number: AM5718


Tool/software: Linux

Hello Everyone,

We have developed our custom board which is mostly same as the AM571x idk.

Now we are facing some issue related to the PMIC.

As per below circuit we are driving the 12 Volt using one gpio.
Now we have connect load on 12V_D1 then we are doing gpio6_8 high pin high then it work fine.
same case we have connect load on 12V_D2 then we are doing gpio6_8 high pin high then it work fine.

but if we connect load on both 12V_D1 and 12V_D2 and then after we doing gpio6_8 high then board will reboot again. as per our more research we found that PMIC REGEN1 (F8) pin is reseting during this.

so can anyone have idea why this thing happen?
is there any PMIC configuration need to be chnage for this?


Thanks & Best Regards,

Nikunj Patel

  • 0
    TI__Genius 13567 points

    Nikunj Patel said:

    we found that PMIC REGEN1 (F8) pin is reseting during this.

    That sounds like the UVLO or some other power fault is detected by the PMIC causing it to reset the board. What kind of load is planned on 12V_D1 and 12V_D2? Opening the FET slower may help with the load response and prevent a power fault on the system. 

  • 0 in reply to Ahmad_Rashed
    Expert 1870 points
    Thanks, Ahmed for your quick reply.

    We are driving the led driver which controlled 6W to 8W LEDs.
    can you more explain about UVLO?
    also please explain in details "Opening the FET slower may help with the load response" this sentence.

    "power fault is detected by the PMIC causing it to reset the board." can it manage by the software?

    Thanks & Best Regards,
    Nikunj Patel
  • 0 in reply to Nikunj Patel
    Expert 1870 points
    gentle reminder,

    Thanks & Best Regards,
    Nikunj Patel
  • 0 in reply to Nikunj Patel
    TI__Genius 13567 points

    Can you share more information on the power topology? From 12V how do you power the PMIC? Based on the information so far I want to know if the UVLO of the PMIC is triggered. You can check this with an oscilloscope to monitor the voltage at VCC1 pin of the PMIC. If it ever goes below 3.1V this will trigger the PMIC to restart the system.