Power and Control Section Design of Orin NX Module for Custom Board

Autonomous Machines Jetson & Embedded Systems Jetson Orin NX
1

Hi,
We are developing a custom board based on Jetson Orin NX Module.
we have few doubts on that,

  1. We need to Power the Module from 5V only (VDD_IN). So in the module, Module ID pin is connected to GND or it’s floating. Or can we connect the Module ID Pin (217) connect directly to GND in Carrier Board itself irrespective of the connections in Module?

  2. Regarding PWER_EN signal: we are using auto power on mode only(no power button), and VDD_IN is 5V as discussed in first point, so can we supply same voltage to POWER_EN pin, or need to implement a logic for applying delay b/w VDD_IN and POWER_EN. if required, can you suggest it, we are not planning to use Microcontroller based one that used in Eval.board.

  3. Regarding SYS_RESET Pin : Is it compulsory to use to enable the Carrier Board power Rails using this signal?

Please give a clarifications for above points.

3

  1. Module_ID pin is floating on Orin NX module and shorted to GND on Orin Nano module. It is used to choose power voltage (5V only or 5V-20V) on carrier board. If your design is 5V only, you can ignore pin 217 i.e. both floating and GND are ok.

  2. The Design Guide has given clear info: The carrier board receives the main power source and uses this to generate the enable to Jetson Orin module (POWER_EN) after the carrier board has ensured the main supply is stable and the associated decoupling capacitors have charged. You need to make a logic design to guarantee that if you don’t want to use a MCU.

  3. Yes, it is MUST to use SYS_RESET to enable carrier power rails.

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4

Hi,
Thank you for your reply.
Can you suggest a Logic Circuit for the POWER_EN pin?

One more doubt I have in VBUS Detect on USB0.
In the design shown one example with Micro B Connector, (Page no. 30, fig no. 7.1). In that MOSFET drain pin is connected to GPIO00 directly, but due to open drain, need a pull resistor to 1.8V is required. Correct me if not?

5

You can refer to the power on/off logic circuit in Jetson nano carrier schematic ( Jetson Nano Developer Kit Carrier Board Design Files (P3449 B01) ).

No need to add external pull-up as GPIO00 pin has internal pull-up.

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