VDDCORE, VDDSOC and VGEN5_3V3 voltages dropdown after booting

[sagar_kumar]

Hi 

We are using i.MX6Q MCIMX6Q6AVT10AE and PMIC MMPF0100F6AEP in one of our project. We found when device does not have image at that time we are getting voltage as follow

VDDCORE= 1.38V

VDDSOC= 1.38V

VGEN5_3V3= 3.3V

But After booting up these voltages are get reduced and we get voltages as follow-

VDDCORE= 1.15V

VDDSOC= 1.18V

VGEN5_3V3= 2.99V

Please let me know is it normal behavior or there is something wrong in my design or image?

[igorpadykov]

Hi Sagar

such behaviour may be normal as linux cpufreq driver can change voltages

based on cpu load, it is described in linux documentation on
i.MX Software | NXP 

Best regards
igor
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[sagar_kumar]

Hi Igor

It is ok for VDDCORE and VDDSOC, but why VGEN5_3V3 drop down its voltage? Since it is not connected to any load in my design.

[igorpadykov]

Hi Sagar

one can debug it using sect.2.5.2 PMIC PF Regulator Linux Manual

from linux documentation i.MX Software | NXP 

Best regards
igor