Hello,
I am currently designing a carrier board for the Jetson and have some unused pins not mentioned in Section 22. Specifically HDMI_CEC (pin J50) and DPx_HPD (pins K50, K51, and K52).
What is the guidance for these pins?
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The unused pins you mentioned, specifically HDMICEC pin J50 and DPxHPD pins K50, K51, and K52, are not explicitly mentioned in Section 22 of the Jetson Orin NX Series and Jetson Orin Nano Series Product Design Guide. However, we can find guidance for these pins in other sections of the guide.
According to Chapter 14, “Unused Interface Terminations,” the DP1_HPD and HDMI_CEC pins are listed as unused dedicated special purpose pad interfaces. The guide recommends checking the Unused SFIO (Special Function I/O) interface pins section in the design checklist attached to the design guide for more information.
Additionally, the guide provides information on unused multi-purpose standard CMOS pad interfaces in Chapter 14.1. Although the specific pins you mentioned are not listed in this section, it provides general guidance on how to handle unused pins.
For the HDMICEC pin J50, it is likely that this pin is related to the HDMI interface, and it may be safe to leave it unconnected if not used. However, to confirm, it is recommended to check the design checklist and the HDMI interface specifications.
For the DPxHPD pins K50, K51, and K52, these pins are likely related to the DisplayPort interface. According to the guide, the DP1_HPD pin is listed as an unused dedicated special purpose pad interface. It is recommended to check the design checklist and the DisplayPort interface specifications for more information on how to handle these pins.
In general, when dealing with unused pins, it is essential to follow the guidelines provided in the design guide and to consult the relevant interface specifications to ensure that the pins are handled correctly and do not cause any issues with the system.
In comparison to other Jetson modules, the Jetson Orin NX and Jetson Orin Nano series modules have different pinouts and interface configurations. Therefore, it is crucial to consult the specific design guide for the module you are using to ensure that you are following the correct guidelines for unused pins.
In summary, for the unused pins HDMICEC pin J50 and DPxHPD pins K50, K51, and K52, it is recommended to:
- Check the design checklist attached to the design guide for more information on unused SFIO interface pins.
- Consult the HDMI and DisplayPort interface specifications for guidance on how to handle these pins.
- Follow the guidelines provided in Chapter 14 of the design guide for unused interface terminations.
By following these steps, you can ensure that the unused pins are handled correctly and do not cause any issues with your system.
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The HDMI_CEC and DP HPD pins may be used as GPIOs or can be left unconnected (NC).
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