PMIC PF0100 Reference voltage issue

[jomsabu]

The DDR reference voltage from PMIC giving 1.2v rather than .75v.How to solve this issue

[art]

Do you mean the VREFDDR output of the PMIC? If so, please specify some more details. What voltage is applied to VINREFDDR? How VHALF is connected? Please provide the schematic of the PMIC connections.

Have a great day,
Artur

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[jomsabu]

We have done power testing with PMIC MMPF0100F0AEP, all voltage levels are working fine except VREFDDR (half voltage of VINREFDDR-1.5V) .

Expecting voltage at VREFDDR is 0.75V but we found that as 1.2V.

Please go through the below image,

[jomsabu]

[art]

The MMPF0100 PMIC doesn't have any internal mechanism to control the VREFDDR voltage, it can only be enabled/disabled internally. In normal conditions (all external circuits are connected correctly), the VREFDDR voltage is exactly the half of VINREFDDR. So, in your case, most likely there is some external side effect e.g. voltage leakage or short circuit. Please check. Also, check whether the VREFDDR voltage is enabled in the VREFDDCRTL register (bit 4 should be 1) of the PMIC.

Artur

[art]

Sorry, don't see any image here.

Artur