Voltage on SNVS Supply

[sadatanvashisth]

I am using IMX6ul processor with PMIC PF3000A3. We are facing below mentioned issue:

1. There is no supply available for processor including VDD_SNVS_IN.

2. There is a pull up (from an always ON supply) connected on a SNVS powered pin.

3. With out powering up the processor we are getting 2.6V on VDD_SNVS_IN .

In this case if I connect a always ON supply to VDD_SNVS_IN , then we are not able to turn the processor ON once the processor goes into power off until we remove power from VDD_SNVS_IN as well.

Some one please suggest what could be the possible cause of this issue and how we should solve this.

Regards,

Sadatan

[igorpadykov]

Hi Sadatan

this may be board layout errors, one can try to make board

with minimal components soldered and check VDD_SNVS.

There are recommendations given in Chapter 4 Avoiding Board Bring-up Problems

Hardware Development Guide for the i.MX 6UltraLite Applications Processor

which may be useful to trace them.
http://www.nxp.com/docs/en/user-guide/IMX6ULHDG.pdf

Best regards
igor
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