ML865G1 HW Design Guide
1VV0301632 Rev. 4
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43
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2020-09-23
Wake from deep sleep mode
ML865G1 supports Power Saving Mode (PSM) functionality defined in 3GPP Release 12.
When Periodic Update Timer expires, ML865G1 power off until the next scheduled wake-
up time.
Asynchronous event controlled by host can wake up from deep sleep mode by asserting
ON_OFF/WAKE pin HIGH level for at least 5 seconds.
Host can detect deep sleep mode by polling VAUX/PWRMON pin if previously configured
in the user schematic for this purpose.
NOTE:
Do not use any pull up resistor on the HW_SHUTDOWN* line nor any
totem pole digital output. Using pull up resistor may bring to latch up
problems on the ML865G1 power regulator and improper functioning
of the module.
To proper power on again the module please refer to the related
paragraph (“Power ON”)
The unconditional hardware shutdown must always be implemented
on the boards and should be used only as an emergency exit
procedure.
Fast power down
The procedure to power off ML865G1 described in Chapter 5.4 normally takes more than
1 second to detach from network and make ML865G1internal filesystem properly closed.
In case of unwanted supply voltage loss the system can be switched off without any risk of
filesystem data corruption by implementing Fast Shut Down feature.
Fast Shut Down feature permits to reduce the current consumption and the time-to-
poweroff to minimum values.
