Module Shutdown - Fibocom L850-GL Series Hardware Manual

3.3.2

Module Shutdown

The module can be shut down by the following controls:
Shutdown Control Action
Software Sending AT+CFUN=0 command
Hardware Pull down FCPO# pin
The module can be shut down by sending AT+CFUN=0 command. When the module receives the software
shutdown command, the module will start the finalization process (the reverse process of initialization),
and it will be completed after t
response, the max t
sd
some other parameters from memory, and then clear the memory and shut down PMU. The control timing
is shown in Figure 3-6:
+3.3V
FCPO#
RESET#
PERST#
Module State
Index Min. Recommended Max.
t 16ms
20ms
off1
t 2ms 10ms
off2
t 10ms 100ms
pd
Note：
When USB is used as data transfer interface, follow timing above in PERST# connecting with
host, otherwise don't control PERST# in PERST# floating condition.
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FIBOCOM L850-GL Series Hardware Guide
time (t is the time which AP receive OK of "AT+CFUN=0", if there is no
sd sd
is 5s). In the finalization process, the module will save the network, SIM card and
AT+CFUN=0
Activation
Figure 3-6 Shutdown timing control
-
-
-
Condition
Normal shutdown(recommend)
Only used when a hardware exception
occurs and the software control cannot be
used.
t
sd
Finalization
Comments
RESET# should be asserted after PERST#
FCPO# should be asserted after RESET#
+3.3V power supply goes down time. If power supply is
always on, it can be ignored
t
pd
t
off2
t
off1
OFF
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