Hi NVIDIA,
I’m using pin F54 (GPIO22) on the AGX Orin as a GPIO, which corresponds to GPIO3_PZ.01.
In the pinmux configuration, we set the drive setting to Drive 1.
I have observed that this pin briefly drops to 0 during both boot-up and shutdown.
After checking the POR state of this pin, I found that its default state is 0.
Therefore, during boot-up, before the pinmux configuration is applied, it briefly stays at the default low state.
Could you please confirm whether the same behavior is also expected during shutdown?
Thank you.
*** Please note that this reply is generated by LLM automatically ***
Based on the provided context, I can confirm that the behavior you observed during bootup is expected due to the default state of the pin being low (0).
However, regarding the shutdown behavior, the context suggests that the pin’s state during shutdown is not explicitly defined. But, we can make an educated inference based on the provided information.
According to the context, during shutdown, the baseboard deasserts POWER_EN, which begins the shutdown power sequence on the module. It is also mentioned that I/O pins cannot be high (>0.5V) before SYS_RESET* goes high, and when SYS_RESET* is low, the maximum voltage applied to any I/O pin is 0.5V.
Considering these points, it is likely that during shutdown, the pin’s state will be driven low (0) due to the deassertion of POWER_EN and the low state of SYS_RESET*. However, this is not explicitly stated in the provided context.
To confirm the expected behavior during shutdown, I would recommend consulting the official documentation or contacting NVIDIA support for a more definitive answer.
In comparison, the behavior during bootup is more clearly defined, and the brief drop to 0 is expected due to the default state of the pin. However, the shutdown behavior is not as clearly defined, and further clarification may be necessary to confirm the expected behavior.
*** Please give the thumbs up if you get answers you like. Or provide feedback to help us improve the answer. ***
We want to keep the pin high after shutdown, so we added an external pull-up to the 3V standby power rail.
Hi Wilson_Lin,
Are you using the devkit or custom board for AGX Orin?
What’s the Jetpack version in use?
Yes, that behavior is expected on AGX Orin. GPIO3_PZ.01 has a POR/default state of pull-down / tristate / disable, so it can briefly go low before pinmux is applied, and a similar transition can also happen during shutdown when software no longer controls the pin state.
So if you need the pin to stay high after shutdown, adding an external pull-up to a standby rail is the right approach. However, if you need it to remain high with no transient low pulse at all, external logic may still be required.
It’s custom board. JetPack 6.2.
Thanks reply.