User Guide

ME910G1 HW Design Guide
1VV0301593 Rev.7 Page 42 of 98 2021-02-02
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 always achieve 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
Signal
Function
I/O
PAD
HW_SHUTDOWN*
Unconditional Shutdown of the Module
I
R13
Table 18: HW_SHUTDOWN* signal
Warning: The hardware unconditional Shutdown must not be used
during normal operation of the device since it does not detach the
device from the network. It shall be kept as an emergency exit
procedure.