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L816-AM Hardware User Manual
Page 24 of 42
Note:
The Reset_N is required to pull high with a 1s delay after the VBAT, because it takes some time
to charge the capacitors for +3.3V power supply. If the VBAT power supply is already stable
before starting up the module, the delay time can be ignored.
3.3.2 Module Shutdown
The L816-AM module can be shut down by software or hardware control.
Control mode
Action
Condition
Software
Sending AT+CPWROFF
command
Normal shutdown.
Hardware
Pull down Power_On/Off pin
Only used when a hardware exception occurs
and the software control cannot be used.
The module can be shut down by sending AT+CPWROFF command. When the module receives the
shutdown command, the module will plug Low the FW_Ready and start the finalization process (the
reverse process of initialization), and it will be completed after 3s. In the finalization process, the module
will save the network, SIM card and some other parameters from memory, then clear the memory and
PMU will be powered off. The control timing is shown in Figure 3-7:
Figure 3-7 Software Shutdown Timing Control
After the software shutdown, the Power_On/Off pin will remain high which prevents the module from
restarting again. To enable the next restart, the Power_On/Off pin should be pulled low after shutting
down.
