Note: To avoid a back-powering effect, it is recommended to prevent any HIGH
logic level signals from being applied to the digital pins of the module when it is
powered OFF or during an ON/OFF transition.
Figure 5: Example Circuit for ON/OFF by FULL_CARD_POWER_N
Power Off
Power off of the device can be done in two different ways:
•
Graceful shutdown by FULL_CARD_POWER_OFF_N
•
Fast shutdown by GPIO triggered
Graceful Shutdown
To shutdown the FN990 Family module safely, the host can use the graceful shutdown
function.
The graceful shutdown can be triggered by:
•
FULL_CARD_POWER_OFF_N
Graceful Shutdown by FULL_CARD_OFF_N
To gracefully shutdown the FN990, FULL_CARD_POWER_OFF_N should be asserted to Low.
Once FULL_CARD_POWER_N is asserted to Low, the FN990 enters the finalization state,
terminates active processes, and prepares to turn off safely.
As shown in the diagram below, VREG_L6B_1P8 will indicate when the module is ready to
be turned off.
Figure 6: Graceful Shutdown by FULL_CARD_POWER_OFF_N
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