*** Please note that this reply is generated by LLM automatically ***
I’d be happy to help you with your custom carrier board development for Jetson AGX Orin.
Firstly, I understand that you’re experiencing a power sequencing issue, where the actual hardware implementation differs from the recommended power sequencing specified in the Jetson-AGX-Orin-Design-Guide_DG-10653-001v1.7.pdf (page 33). To summarize, the recommended power sequencing is:
SV (3.3V) is applied first.
MV (5V) is enabled 20 ms after SV.
HV (7~20V) is enabled 1 ms after MV.
However, in your actual hardware implementation:
HV is enabled about 45 ms after SV is applied.
MV is enabled about 20 ms after HV is applied.
To resolve this issue, you’ve identified two possible solutions:
Enabling MV about 20 ms after SV (moving it earlier).
Delaying HV to about 65 ms after SV.
To adjust the power sequencing timing properly on hardware, I recommend the following steps:
Review the schematic: Double-check the schematic of your custom carrier board to ensure that it matches the Development Kit schematics exactly. Verify that the power sequencing is implemented as per the recommended guidelines.
Check the power sequencing components: Identify the components responsible for power sequencing, such as voltage regulators, power management ICs (PMICs), or other control circuits. Verify that these components are properly configured and that their timing characteristics match the recommended power sequencing.
Modify the power sequencing components: If necessary, modify the power sequencing components to achieve the recommended timing. This might involve adjusting the values of resistors, capacitors, or other components that control the timing of the power sequencing.
Add delay components: If required, add delay components, such as resistors and capacitors, to introduce the necessary delays in the power sequencing. For example, you can add a resistor-capacitor (RC) circuit to delay the enable signal of HV by about 65 ms after SV.
Verify the power sequencing: After making any modifications, verify the power sequencing using an oscilloscope or other measurement tools to ensure that it matches the recommended timing.
Regarding the availability of an updated schematic or modification guide, I couldn’t find any specific information in the provided context. However, I recommend checking the official NVIDIA documentation and support resources for any updates or errata related to the Jetson AGX Orin design guide.
Additionally, you may want to consider consulting with NVIDIA support or a qualified hardware engineer to ensure that any modifications you make to the power sequencing are correct and do not compromise the functionality or reliability of your custom carrier board.
In comparison to the Jetson Orin NX, which is also mentioned in the context, the power sequencing requirements might be different. However, the general principles of power sequencing and the importance of following the recommended guidelines remain the same.
I hope this comprehensive answer helps you resolve the power sequencing issue on your custom carrier board for Jetson AGX Orin. If you have any further questions or concerns, feel free to ask!
If your design is exactly the same as our reference design then the power up sequence should be as expected. Please compare the schematics thoroughly and also check the AGX Orin design guide.
Do you use Button Power MCU?
Are you using USB Type C PD Controller and is it flashed with correct firmware?
Are you powering from USB C PD path or through DC barrel jack?
Have you tried powering through DC barrel jack to measure power sequence?
