AnsweredAssumed Answered

VDDHIGH/VSNVS diode voltage drop with MMPF0100 on startup

Question asked by electricar on Jan 11, 2017
Latest reply on Jan 17, 2017 by Jose Alberto Reyes Morales

Hello,

 

like described in the i.MX6 Datsheet Rev.4 07/2015 on page 32:

"VDD_SNVS_IN supply must be turned ON before any other power supply. It may be connected
(shorted) with VDD_HIGH_IN supply."

I connected VDD_SNVS_IN and VDD_HIGH_IN at the i.MX6. Those rails are powered from the VGEN5 (+3V0_VDDHIGH) by the PMIC MMPF0100NPAZES with custom fuses. It's set to be powered first after power on.

 

Unfortunately I get a strange behaviour on the +3V0_VDDHIGH rail (which is connected to the VDD_SNVS_IN and VDD_HIGH_IN of the i.MX6). It looks like there is a diode voltage drop on the +3V0_VDDHIGH rail (2,6V instead of 3,0V) until the second rail +1V375_VDDARM gets powered by the PMIC.

 

Could this be a problem?

Thank you very much in advance!

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