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I’d be happy to help clarify the sudden power loss sequence for the Jetson Orin NX.
According to the design guide, specifically Figure 6-6 on page 20, during a sudden power loss, the SHUTDOWN_REQ* signal is not explicitly mentioned as being driven by either the Jetson or the carrier board. However, it is mentioned that SHUTDOWN_REQ* must always be serviced by the carrier board to toggle POWER_EN from high to low, even in cases of sudden power loss.
In your case, since you plan to use a voltage supervisor for POWER_EN with a disable input coming from SHUTDOWN_REQ*, it is likely that the carrier board will be responsible for pulling down SHUTDOWN_REQ* in response to a sudden power loss. This is because the voltage supervisor will detect the undervoltage condition and trigger the disable input, which will then pull down SHUTDOWN_REQ*.
However, it is also possible that the Jetson module could drive SHUTDOWN_REQ* low in response to a sudden power loss, but this is not explicitly stated in the design guide.
To clarify, I would recommend checking the Jetson Orin NX datasheet or contacting NVIDIA support to confirm the behavior of SHUTDOWN_REQ* during a sudden power loss.
Regarding your plan to use a voltage supervisor for POWER_EN with a disable input coming from SHUTDOWN_REQ*, it seems like a reasonable approach. However, you should ensure that the voltage supervisor is properly configured to detect the undervoltage condition and trigger the disable input correctly.
Additionally, since you mentioned that nearly all shutdowns will be caused by power loss, and there will be no power off button, you may want to consider implementing a power loss detection circuit on the carrier board to detect when the power is lost and trigger the shutdown sequence accordingly.
In terms of pulling down POWER_EN directly without pulling down SHUTDOWN_REQ*, it is not explicitly stated in the design guide whether this is allowed or not. However, it is generally recommended to follow the power sequencing guidelines outlined in the design guide to ensure proper shutdown and avoid potential damage to components on either the module or the carrier board system.
Overall, I would recommend exercising caution and consulting the Jetson Orin NX datasheet or NVIDIA support to confirm the behavior of SHUTDOWN_REQ* during a sudden power loss, and to ensure that your design meets the power sequencing guidelines outlined in the design guide.
Here is a summary of the key points:
- SHUTDOWN_REQ* is not explicitly mentioned as being driven by either the Jetson or the carrier board during a sudden power loss.
- The carrier board is responsible for servicing SHUTDOWN_REQ* to toggle POWER_EN from high to low, even in cases of sudden power loss.
- It is possible that the Jetson module could drive SHUTDOWN_REQ* low in response to a sudden power loss, but this is not explicitly stated in the design guide.
- Using a voltage supervisor for POWER_EN with a disable input coming from SHUTDOWN_REQ* seems like a reasonable approach, but ensure proper configuration and detection of undervoltage conditions.
- Implementing a power loss detection circuit on the carrier board may be necessary to detect when the power is lost and trigger the shutdown sequence accordingly.
- Pulling down POWER_EN directly without pulling down SHUTDOWN_REQ* is not explicitly stated as allowed or not, and caution should be exercised to ensure proper shutdown and avoid potential damage to components.
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