ME910G1 HW Design Guide
1VV0301593 Rev.3 Page 45 of 97 2020-03-24
Wake from deep sleep mode
ME910G1 supports Power Saving Mode (PSM) functionality defined in 3GPP Release 12.
When Periodic Update Timer expires, ME910G1 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 LOW for at least 5 seconds.
Host can detect deep sleep mode by polling VAUX/PWRMON pin if previously configured.
Unconditional Shutdown
HW_SHUTDOWN* is used to unconditionally shutdown the ME910G1. Whenever this
signal is pulled low, the ME910G1 is reset. When the device is reset it stops any
operation. After the release of the line, the ME910G1 is unconditionally shut down, without
doing any detach operation from the network where it is registered. This behaviour is not a
proper shut down because any cellular device is requested to issue a detach request on
turn off. The HW_SHUTDOWN* is internally controlled on start-up to achieve always a
proper power-on reset sequence, so there's no need to control this pin on start-up.
To unconditionally shutdown the ME910G1, the pad HW_SHUTDOWN* must be tied low
for at least 200 milliseconds and then released.
The signal is internally pulled up so the pin can be left floating if not used.
If used, then it must always be connected with an open collector transistor, to permit
to the internal circuitry the power on reset and under voltage lockout functions.
During PSM mode, HW_SHUTDOWN toggle has no effect. The use of HW_SHUTDOWN*
pin is valid only when ME910G1 has VAUX/PWRMON output HI.
PIN DESCRIPTION
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