Hello,
Regarding the STM32N657, I'm not using the internal SMPS. My question is: Do we need to put capacitors on the 6 VDDSMPS pins or can they be left as no connect?
Same question on the VLXSMPS pins... do we need the capacitors on these pins, or can they be left as no connect?
Also, on the STM32N657-DK board, there is a snubber circuit on the VLXSMPS pins, why?
Finally, when I say "No connect", I assume these pins are connected internally, so it does not require an external link on the PCB when not used. Is this correct? (this will probably make the routing of the PCB easier)
We are dealing with a very Very VERY small PCB, and saving the space used by 12 x 0402 makes a difference.
thanks
VDDSMPS must be grounded when SMPS is not used. Capacitors are not needed.
*Getting started with hardware development for STM32N6 MCUs - Application note
> I'm not sure if you are responding to this post or: STM32N657-DK board bug or NC?
This post.
My reply was made before you edited your post to add the VLXSMPS questions.
> on the STM dev board, this pin is floating.
It looks connected to me.
(So does VLXSMPS.)
hi @TDK
1- thanks for the appnote - didn't see that one before.
2- No on the STM32N6570-DK board, the VCCA18PMU pin seems to be floating:
VDDA1V8PMU is connected to VDD1V8 thru and inductor L8
and also connected to VDDA1V8 thru R173 which is not installed
VDD1V8 is generated by external switcher, but R21 is a no install
and since the VDDA18PMU is floating, the VDD1V8 is all floating from the STM32
SMPS stuff table for the STM32N6570-DK board....
Very confusing design here....
