STM32N6570 Unused Pins

[Austin_D]

Hi all,

I am designing a custom PCB using the STM32N657Z0 and am looking for some advice on how to treat some of the specialized pins that I don't plan on using. Specifically I have not been able to find any recommendations on how to treat any of the CSI pins if they are not in use. The closest I've found was https://community.st.com/t5/stm32-mcus-products/stm32n6-minimal-hardware-design/td-p/794094 which did inform me on what to do with my unused USB OTG pins for the most part. Would it be acceptable to ground all these pins with a shared external pull-down? This is what AN5967 would lead me to believe but I wasn't sure if these pins were grouped in with what was described in section 12.7.

 

Appreciate any help, thanks!

[jiangfan]

In many cases, I think it be acceptable/good to ground all unused pins (except some special pins) with a shared external pull-down, such as 1k ohm.

[Austin_D]

Can you specify what some of those special pins are? I know some of the CSI pins are not standard as they are differential pair and are not part of the same circuit as GPIO.