Capacitance Value Confusion in Nvidia Jetson Orin Nano Dev Board Schematic

Issue Overview

Users are experiencing confusion regarding the capacitance values for capacitors C411 and C408 in the schematic of the Nvidia Jetson Orin Nano Dev board. The specific symptoms include:

• Inconsistent Information: Users noted that C411 is indicated as 1nF in the schematic, while it is suggested to have the same value as C409 from the P3768_A04_BOM. However, C408 is missing from the BOM entirely.

• Context of Issue: This problem arises during hardware setup and component selection, particularly when users are attempting to adhere to the schematic for proper assembly and functionality.

• Hardware Specifications: The issue pertains specifically to the LDO (Low Dropout Regulator) and AO (Analog Output) rails on the board.

• Frequency of Issue: This confusion appears to be a common point of inquiry among users, indicating it may not be an isolated incident.

• Impact on User Experience: Misunderstanding the correct capacitance values could lead to improper functioning of the power supply circuits on the board, potentially affecting overall system stability and performance.

Possible Causes

The potential reasons for this confusion around capacitance values include:

• Hardware Documentation Inconsistencies: The discrepancy between the schematic and BOM can lead to uncertainty regarding which capacitor values should be used.

• Software Bugs or Conflicts: If there are software tools used for design that reference incorrect values, this could propagate errors in component selection.

• Configuration Errors: Users may misinterpret schematic details if they are not familiar with standard practices in reading electronic schematics.

• User Errors or Misconfigurations: Inexperienced users might overlook important notes or instructions related to component selection.

Troubleshooting Steps, Solutions & Fixes

To address the capacitance value confusion for capacitors C411 and C408, follow these troubleshooting steps:

1. Verify Schematic Values:

   • Cross-reference the schematic with other reliable sources or community forums to confirm the intended capacitance values.
   • Check if there are any errata documents or updates from Nvidia regarding this issue.

2. Consult BOM Documents:

   • Review the P3768_A04_BOM carefully for any notes about capacitor specifications.
   • If C408 is missing, consider reaching out to Nvidia support or community forums for clarification.

3. Testing with Different Capacitor Values:

   • If possible, prototype with both 1nF (as per schematic) and other common values (like those used for similar circuits) to observe any differences in performance.

4. Community Engagement:

   • Engage with community forums to see if others have encountered similar issues and what resolutions they found effective.
   • Post specific queries regarding capacitor values to gather insights from experienced users.

5. Documentation Review:

   • Refer to Nvidia’s official documentation regarding the Jetson Orin Nano for any updates or corrections related to component specifications.
   • Look for application notes that might clarify capacitor usage in power supply designs.

6. Best Practices for Future Reference:

   • Always double-check component values against multiple sources before finalizing designs.
   • Maintain a log of any discrepancies found in documentation for future reference and community sharing.

7. Recommended Approach:

   • Based on user feedback, using a 1nF capacitor for C411 as indicated in the schematic appears to be a widely accepted practice until further clarification is provided on C408.

By following these steps, users can better navigate the confusion surrounding capacitor values in their Nvidia Jetson Orin Nano Dev board setup. Further investigation may be needed if discrepancies persist or if new information becomes available from Nvidia or other users.