RTC for Jetson Orin Nano

Issue Overview

Users are experiencing difficulties activating the built-in Real-Time Clock (RTC) on the Nvidia Jetson Orin Nano. The primary symptoms include confusion regarding the type of battery required for the RTC and how to connect it correctly, particularly concerning polarity. The issue arises during setup when users attempt to integrate the RTC functionality. The relevant hardware specification indicates that a backup battery, specifically a CR1225, is necessary, but users are uncertain whether this battery should be rechargeable. One user suggested using a CR2032 battery instead due to its larger capacity and common availability. The impact of this problem can hinder the proper functioning of the RTC when the main power supply is absent, potentially leading to loss of timekeeping when the device is powered off.

Possible Causes

• Battery Type Confusion: Users may not be aware that while a CR1225 is specified, it is not rechargeable, leading to potential misconfigurations.
• Connection Errors: Incorrect polarity in connecting the battery could prevent the RTC from functioning correctly.
• Documentation Gaps: Insufficient clarity in official documentation regarding battery specifications and connections may contribute to user errors.
• Hardware Limitations: If users attempt to use non-standard batteries or connections, it could lead to incompatibility with the RTC module.

Troubleshooting Steps, Solutions & Fixes

1. Verify Battery Type:

   • Confirm that you are using a CR1225 battery as specified in the datasheet. Rechargeable options are not supported.
   • Consider using a CR2032 if you need a more common and higher-capacity alternative.

2. Check Battery Connection:

   • Ensure correct polarity when connecting the battery:
     • The positive terminal should connect to the pin marked with a white triangle on the PCB.
     • Double-check connections against any available diagrams in the datasheet.

3. Consult Documentation:

   • Review the Jetson Orin Nano datasheet for specific details regarding RTC implementation and battery requirements.
   • Look for community discussions or official Nvidia forums for additional insights or clarifications.

4. Testing RTC Functionality:

   • After installing the correct battery, test if the RTC retains time when powered off.
   • Use commands or utilities provided in your development environment to check RTC status.

5. Best Practices:

   • Always ensure that your device is powered down before making any hardware changes to avoid damage.
   • Regularly check for updates on Nvidia forums or documentation for any new insights regarding RTC usage or troubleshooting.

6. Community Support:

   • If issues persist, consider posting detailed questions on Nvidia’s developer forums or other community platforms where experienced users may provide assistance.
   • Share your specific setup details and any steps you’ve already taken to troubleshoot.

7. Documentation and Updates:

   • Keep an eye on Nvidia’s official documentation for any updates regarding hardware compatibility or software patches that may affect RTC functionality.

By following these steps, users can effectively troubleshoot and resolve issues related to activating and utilizing the RTC on their Nvidia Jetson Orin Nano devices.