According to figure 6.3 (auto power on) in the ‘guide design Jetson Orin Nano’ document, I have designed a simple power-on circuit using only the power good pin from the power IC to enable the POWER_EN pin and wait for the SYS_RESET pin to be pulled high in order to turn on additional power on the carrier board if needed. Is it acceptable to design this in a simple way without using a power-on circuit or power-on management IC like that?
Custom design should follow the power on sequence to make power-on successful. Please estimate your design based on that and Design Guide doc.
Tks for your repply,
Because I have to design carrier board for mini-drone, so I want to optimize component and just want to auto power on/off when the power plug in/out => So I decide to use POWER_GOOD pin from DC-DC converter to active POWER_EN pin jetson orin nano. In theory, I see it can work well but I need the confirmation before I make real hardware.
We don’t have other suggestion than that in DG and reference. You should estimate that by yourself to fulfill below sequence and timing.
You are using the figure in case of MCU using, I mean no using MCU, no using button like figure 6.3/page 19. Sorry I can’t upload image due to my limiter on the network.
Yes, I mean that. I can see that has no requirement for power-up sequence? Just active high on the POWER_EN pin when VDD_IN is good enough and don’t active on SHUTDOWN_REG pin => Simple design is using POWER_GOOD pin of DC-DC converter to active POWER_EN.
I also don’t care so much on the remain carrier board supplies (I don’t really need ensure proper power on/off sequencing between module and carrier board supplies - the function of SYS_RESET during power-up sequence). And the “carrier board supplies” means the power of peripheral that communicate with jetson module?
Yes, “carrier board supplies” means the power of peripheral that communicate with jetson module and no other requirements than that in sequence.
Thank you for your reply.
So basically, I understand that I can design it as I mentioned for power-up without any problem.
You can also refer to below design in Jetson Nano carrier schematic Jetson Nano Developer Kit Carrier Board Design Files (P3449 B01).
Tks you for your reply, I will follow the design that you sent
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