Can I get more clarification on what happens during the POWER-ON Sequence is when MODULE_POWER_ON is asserted to the Jetson-AGX-Orin? In figure 5.2 in the design guide, it says a 1.8V rail (& others) is powered on. However when I look at figure 5.1 it makes no mention of any 1.8V rail.
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Based on the context, I will provide a comprehensive answer to clarify the POWERON sequence for the Jetson AGX Orin module.
The POWERON sequence is a critical process that occurs when the MODULEPOWERON signal is asserted to the Jetson AGX Orin module. This signal triggers a series of events that ultimately power on the module.
According to the design guide, when the MODULEPOWERON signal is asserted, the following sequence of events occurs:
- The 18V rail is powered on, as shown in Figure 52. This rail is likely used to power the module’s high-voltage components, such as the power management ICs (PMICs) and the voltage regulators.
- The PMICs and voltage regulators are enabled, which in turn power on the module’s core components, such as the CPU, memory, and peripherals.
- The module’s power-on sequence is completed, and the module is fully powered on.
However, as you pointed out, Figure 51 does not mention the 18V rail. This might be due to the fact that Figure 51 is a more general diagram that shows the overall power architecture of the module, while Figure 52 is a more detailed diagram that shows the specific power sequencing events.
It’s possible that the 18V rail is not explicitly mentioned in Figure 51 because it is not a critical component of the overall power architecture. Instead, it might be a specific implementation detail that is only relevant to the power-on sequence.
To clarify, I would recommend checking the design guide’s documentation for any additional information on the 18V rail and its role in the power-on sequence. Additionally, you may want to verify the specific implementation details of your module to ensure that the 18V rail is indeed powered on during the POWERON sequence.
In summary, based on the context, it appears that the 18V rail is powered on during the POWERON sequence of the Jetson AGX Orin module, as shown in Figure 52. However, the absence of the 18V rail in Figure 51 might be due to the diagram’s focus on the overall power architecture rather than the specific power sequencing events.
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Additionally, Figure 5.1 mentions 3.3V in the power subsystem. When does that get powered on? Is it when MODULE_POWER_ON is asserted or earlier?
MODULE_POWER_ON triggers the power sequencer on the AGX Orin module, which turns on the on-module 1.8V supplies as part of the power on sequence. These are some of the “Switchers” mentioned in the orange block in Figure 5-1.
The 3.3V rails on the module are also controlled by the power sequencer, so they come up after MODULE_POWER_ON.
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Follow-up question; Are these voltages driven by Vin_HV or Vin_MV? Or in the case of the industrical model, are any driven by Vin_SV?
VIN_MV sources the 1.8V and 3.3V regulators on all AGX Orin modules, including industrial.
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