I have been trying to power the Jetson Xavier NX via the GPIO header as ‘I think was mentioned’ in the Jetson Nano thread linked below. Using pins 2+4 (pin 6+9 GND). However when I feed in 5v regulated power it does nothing. I am starting to think this is not possible though do to what I found below.
Below I have listed out what I have found and many questions. However the main question is: Is it possible and if so how to power the Xavier NX with 5V, and still run in all power modes (10-20W).
In Jetson_Xavier_NX_DevKit_Carrier_Board_Specification_v1.0.pdf, states that the GPIO pins can support a max of 1A per 5V pin so powering via J12 pins seems to be not not possible? Maybe in 10W mode?
In Jetson_Xavier_NX_Product_Design_Guide_DG-09693-001_v1.4.pdf page 12, it states “The developer kit carrier board designs latch POWER_EN state to ensure that the signal stays active”. So with a dev board it should just power on if supplied power? Since it is not, I am assuming GPIO 5V pins are not able to power the board.
It seems that by using the optional PoE Backpower Header – J18, I can supply up to 3A at 9-20V.
Do voltage regulators need to be current limiting?
I couldn’t find any mention of high current (>1A) 5V inputs on the dev board. I am thinking if I can supply 5V via my own regulator it would remove the need to use the regulator on the carrier board possibly saving power. My voltage source is a 6S Li-ion battery, which is out of the DC jack input range, so it needs a regulator of its own regardless.
The info below suggest 5V input exist on the Nano though.
Jetson Nano thread:
“The devkit may also be powered from pins 2+4 (pin 6+9 GND) of the J48 Expansion Header - up to up to 5V⎓3A per pin (5V⎓6A total).” Power supply considerations for Jetson Nano Developer Kit
However the documentation seems to disagree:
J48 seems to be used for a jumper, and the pins 2,4,6,9 seem to be referencing the J41 expansion header?
Also since the J48 header only has two pins they are probably labeled pin 1 and 2?
I couldn’t find a table for J48 in documentation, NVIDIA Jetson Nano Developer Kit Carrier Board P3449_B01 SP-09732-001_v1.1.pdf.
Also, it states that pins 2 & 4 on J41 (40 pin GPIO) have a max power rating of 5V 1A per pin. Does this mean the board cannot be powered via the GPIO? I think I am missing something I could not find any 5V 3A pins in the document.