Would like to verify my understanding on the transition from various power states, in a system with SRC0GS22D (‘Simplified Button Circuitry’) and have a question on how to power-off.
Attached diagram.
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Battery insertion / removal transfer the system from ‘Mechanical Off’ to ‘Power Off’, where only the ‘ALWAYS_ON’ power-rails are operational.
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Pressing on the power-button, will transfer the system to ‘ON’ state, where all power-rails are valid, and all SOM modules are enabled and running
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When configured so, the SOM will enter SLEEP state, where some of its modules are disabled or has no clock running.
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The RTC on the SOM can be configured to return the system from ‘SLEEP’ to ‘ON’ state.
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If I want to be able to resume ‘ON’ from ‘Power-Off’ state, I can use external RTC on the carrier-board, and connect its wake signal to the power-button.
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I’m not sure on the way to power-off using the power-button - I assume that this is done by the SRC0GS22D. Do I have to use a long press? How long?
Power States.pdf (56.7 KB)