VDDCORE, VDDSOC and VGEN5_3V3 voltages dropdown after booting

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VDDCORE, VDDSOC and VGEN5_3V3 voltages dropdown after booting

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sagar_kumar
Contributor I

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?

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igorpadykov
NXP TechSupport
NXP TechSupport

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
Contributor I

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.

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igorpadykov
NXP TechSupport
NXP TechSupport

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

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