Hi,
we are designing a custom carrier-board for Jetson Orin NX/Nano and TX2 NX.
A separate MCU is responsible for powering the SOM (following the power sequence described in the design guide). In order to do that, we need to control the POWER_EN-pin of the module, which is 5V (our MCU is 1V8).
The simplest way to approach this is to use a 1k pull-up resistor to 5V in combination with an open drain output of our MCU (the I/O is 5V-tolerant).
However, I’m unsure if this is a valid solution since the POWER_EN-Pin is described as “5V analog” and has a 100k pull-down resistor on the module.
To my question:
Is a pull-up on POWER_EN okay, or do we need to actively drive this pin to 5V (e.g. via some push-pull-logic).
Thanks in advance!
Best regards…