Note: Graceful Shutdown triggered by FULL_CARD_POWER_OFF_N is only effective
after the module boots up completely.
* The stated total shutdown time is an approximate measure of the latest SW and
HW combination. The shutdown time may be lengthened or shortened depending
on the SW configuration, SW, or HW version.
Fast Shutdown
For quicker FN990 module shutdown, the host application can use the fast shutdown
function, which can be triggered by:
•
GPIO (+ optional shutdown indicator)
Fast Shutdown by GPIO
To leverage the fast shutdown feature, one of the GPIO lines should be assigned as Fast
Shutdown Trigger using the AT commands.
Once the fast shutdown trigger senses a High to Low transition, the fast shutdown is
started: the FN990 enters a finalization state, terminates active processes, and prepares
to turn off safely. As shown in the figure below, when the module is ready to be turned off,
it will be indicated via VREG_L6B_1P8.
Please refer to the AT User Guide for more details on how to enable the shutdown
indicator and fast shutdown trigger.
Figure 7: Fast Shutdown by GPIO
Note: Using a fast shutdown without a shutdown indicator function, the
FULL_CARD_POWER_N pin should be controlled to prevent the FN990 from
rebooting.
For more information, please refer to the AT commands reference guide and SW
user guide document.
* The stated total shutdown time is an approximate measure of the latest SW and
HW combination. The shutdown time may be lengthened or shortened depending
on the SW configuration, SW, or HW version.
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