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Unexpected DC voltage observed on SW2LX of MMPF0100

Question asked by torus1000 on Apr 17, 2016
Latest reply on May 16, 2016 by Yuri Muhin

Hi,

 

Now we are observing VDDs of our i.MX6Q custom board.

Just after shutdown command issued from console but PMIC VIN still kept alive,

we expected all SW regulators  fell to 0V but SW2 kept 1.4Vdc without any PWM/PFM switching noise.

(SW1,3,4=0V, SW2=1.4V, SWBST=0.7V)

 

Have ever someone heard same curious phenomenon? Is it correct behavior?

 

We knew SW2LX(MMPF0100F0 pin22) connected to GEN_3V3(NVCC_LCD/EIM/GPIO/SD/NAND/JTAG)

but current direction seems from PMIC to NVCCs.

 

Can anyone help us?

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