i.MX RT1160 POR pin in custom design

[shekharVerma]

I am designing a custom board around MIMXRT1166D and going through the hardware Design guide and IMX RT 1160 EVAL schematic i found out that POR pin should be Pulled LOW during the entire boot sequence to ensure proper booting of the system and an external Reset IC is required to do the same. If External POR is not being used , the internal POR takes control of the reset system.
I am using the internal DC/DC convertor to power the 1V and 1V8 to the chip.
Can i leave the POR pin unconnected and the system will work as intented? 

[jingpan]

Hi @shekharVerma ,

Yes, If external POR is not being used , the internal POR takes control of the reset system. You can leave it disconnect.

Regards,

Jing

[shekharVerma]

What is purpose of POR? To reset the system if external PMIC is reset ?

[jingpan]

Hi @shekharVerma ,

POR pin is to call a POR reset. PORT reset is the most heavy reset in system. It can reset most of modules than other reset source. And holding POR until the system power stable can keep the system more reliable. So, most of designs will not leave it unconnected.

Regards,

Jing