FN990
Family Hardware Design Guide
1VV0301752 Rev. 3 Page 40 of 92 2022-10-07
Not Sub
ect to NDA
Note: Graceful Shutdown triggered by FULL_CARD_POWER_OFF_N
is only effective after 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.
6.2.2.2. 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)
6.2.2.2.1. Fast Shutdown by GPIO
To leverage fast shutdown feature, one of the GPIO lines should be assigned as Fast
Shutdown Trigger by means of the AT commands.
Once the fast shutdown trigger senses a High to Low transition, fast shutdown is started:
the FN990 enters 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
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