3.3.8 “Module OFF” to “Running” (startup after shutdown)
Figure 55: “Module OFF” to “Running” (startup after shutdown) Power Sequence
In the “Module OFF” state, the module can be turned on by a falling edge of the
CTRL_PWR_BTN_MICO# signal. It is important that the power button is pressed less than 5
seconds. If the button is pressed longer than 5 seconds, some modules will directly initiate a force
OFF sequence. Some modules will ignore a long press to the power button if the
CTRL_PWR_BTN_MICO# was not going high after detecting the power-on event. The actual
behavior depends on the module (please refer to module datasheets).
After detecting the power button event, the module begins to ramp up all the voltage rails in the
same sequence as described in section ”No VCC” to “Running” (startup).
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