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PF0100 VSNVS output voltage <3.0V

Question asked by Zi Jian Chia on May 17, 2019
Latest reply on Jun 11, 2019 by G.w. Sun

Hi,

 

I am troubleshooting three CPU module which failed to bootup due to the VSNVS output voltage is <3.0 V. Three units have different VSNVS: 2.0 V, 1.8 V, 1.63 V. I have tried to replace a new component on one board but the output voltage of VSNVS is still 1.8V. The supplied voltage to VIN is 3.3V.

I understand that the PMIC when powered by VIN, VSNVS is an LDO capable of supplying seven voltages: 3.0, 1.8, 1.5, 1.3, 1.2, 1.1, and 1.0 V. The bits VSNVSVOLT[2:0] in register VSNVS_CONTROL determine the output voltage and the default setting of the VSNVSVOLT[2:0] is 110, or 3.0 V, unless programmed otherwise in OTP.

I used PMIC (MMPF0100F2AEP) with imx6 dual lite SoC (MCIMX6U5DVM10AC) in my CPU module. The PMIC is pre-programmed  (F2 configuration) and I don't use coin cell, just a 0.1uF capacitor connected to LICELL.

 

Any input on why the VSNVS voltage is < 3.0 V although VIN supplied to PMIC is 3.3 V?

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