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PMIC and iMX6 interface issue

Question asked by Chris Tumas on Apr 27, 2016
Latest reply on Apr 28, 2016 by Chris Tumas

We currently have an iMX6 design with the MMPF0100 PMIC.  The power design looks very much like the MCIMX6SLEVK board.   The PMIC LICELL is connected to a rechargable ML-2020 coin cell battery.  The PWRON pin is connected to the iMX6 PMIC_ON_REQ.   The iMX6 ONOFF pin is connected to a test point. 

 

We have run into an issue where the iMX6 will somehow pull the PMIC_ON_REQ low and the PMIC will no longer power up the system when VIN is transitioned from low to high.  Is there any registers in the iMX6 to keep the PMIC_ON_REQ from ever going low?   Is there any registers in the MMPF0100 which would ignore the PMIC_ON_REQ? 

 

I would also like to get a better description of the PWRCTL register bits in the PMIC  (address 1B) .  Would anyone have this information. 

 

Thanks

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