We are in phase of developing our board based at IMX6UL +PM3000.
I read all available documents and also some discussion at forum and I have yet some doubts about pins VDD_HIGH_IN and VDD_SNVS_IN. Reading data sheet of IMX6UL seems that these two domains are full independent, but
analyzing development guide IMX6ULHD6 (page 12) and thread: PF3000 PMIC questions, Dec. 2015
I understand that anyway there is some interaction between these two domains inside IMX6UL.
Unfortunately in official data sheet there is no any info about it and I have now some doubt
My system will not use any coin and following your suggestion in thread (presented above) I decided to use in this way:
1) VSNVS output from PM3000 (pin 34) = 3V connect to VDD_SNVS_IN od IMX6UL via diode schotky
2) VDD_HIGH_IN will be connected to fixed 3.3 (some regulator)
My question: Is this good approach and can I be sure (see page 12 of IMX6ULHD6) that VDD_SNVS_N domain of IMX6UL
will be supplied with 3V3 coming from VDD_HIGH_IN ? I understand in this way comments at page12 of IMX6ULHD6.
It is important for me, because I will use Tampers as GPIO and also other special signals supplied from VDD_SNVS_IN domain and I want to be sure that I/O levels will be 3V3 (not 3.0-0.3 = 2.7, if supplied from VDD_SNVS_IN pin)
I hope that my question is clear.
Thank in advance