Why is a Power MCU used in the reference design?

[thpark19]

Platform: Jetson AGX Orin
Custom Carrier Board: Modified from the original, Ethernet PHY changed from Marvell to TI DP83867

We are currently developing a system based on the Jetson AGX Orin platform, using a custom carrier board.
The only major hardware change is that the Ethernet PHY has been replaced from Marvell to TI’s DP83867.

We are planning to remove the Power Management MCU from the design and instead handle the power sequencing using Reset ID signals.
We are studying the required power sequence to ensure proper implementation.

From our experience, having a dedicated Power MCU is uncommon in typical embedded systems.
So we are wondering: What was the original design rationale for including a Power MCU in the Jetson reference carrier board?
Was it required for specific sequencing behavior, flexibility, or other reasons?

Any insights or official documentation references would be greatly appreciated.

Thanks in advance!

[sgursal]

If you are talking about the Button Power MCU then you could either implement it exactly as is or if you do not want to use it then you could implement a discrete component solution similar to as used in P3449 ON/OFF logic design.

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