User's Manual

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H380-GL Hardware User Manual Page
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3.3.2 Module Shutdown
The module supports two shutdown modes as shown below:
Shutdown
Mode
Shutdown Method
Applicable Scenario
Software
shutdown
Send AT+CPWROFF command
Normal shutdown
Hardware
shutdown
Pull down
FUL_CARD_POWER_OFF#
When software shutdown is unavailable in case
of module abnormity
3.3.2.1 Software Shutdown
AT+CPWROFF command can be sent to shut down the module.
When the module receives software shutdown command, the module starts ending process (finalization,
a reverse process of initialization), and the module completes shutdown after about 3s. When ending
process, the module will save the parameters such as network and SIM card in the memory, and then
empty the memory, and switch off PMU power supply. After shutdown, VSD2_1V8 voltage inside the
module will also switch off. The software shutdown timing is shown in Figure 3-7:
Figure 3-7 Software Shutdown Timing Control Diagram
After the completion of software shutdown, FUL_CARD_POWER_OFF# still remains at high level, at this
moment, the module will not start up again. To facilitate the next start-up of the module,
FUL_CARD_POWER_OFF# should be pulled down first.
Note:
VSD2_1V8 is a PMU inside the module, it outputs 1.8V voltage and has not been led out via M.2
interface, the appearance of this voltage in timing chart is mainly purposed to facilitate the
understanding of timing.