iMX6_SOLOX_3V3

[victorafanasiev]

My questions are concerning of powering the microprocessor   iMX6 SOLOX from a 3.3 volts input power source. For power sequencing I use the preprogrammed PMIC chip MMPF0200F6AEP. But I would like not to use the SW2 output of the PMIC as a source of 3.3 volts for my PCB. I plan to use the input voltage and a load switch instead of use the SW2 output of the PMIC. To control of the load switch I want to use the output voltage of the SW3A output of the PMIC. Is it correct using of PMIC? If so, may I leave unconnected the pins SW2LX, SW2IN, SW2FB of the PMIC chip MMPF0200F6AEP? Or I must connect them as in the MCIMX6SX SDB board  (SCH-27962)? Is it mandatory to have 3.3 volts on the SW2 output for correct operation the chip MMPF0200F6AEP?

[igorpadykov · Accepted solution]

Hi Viktor

for unused pins connection one can look at

Table 1. MMPF0200 pin connection guidelines AN4751 Schematic guidelines for the MMPF0200

https://www.nxp.com/docs/en/application-note/AN4751.pdf 

yes one can use external (not pmic) power for processor, provided that

power-up sequence is followed (it is described in i.MX6SX Datasheet).

https://www.nxp.com/docs/en/data-sheet/IMX6SXCEC.pdf

Best regards
igor
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