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FIBOCOM L850-GL Series Hardware Guide Page 27 of 59
3.3.2 Module Shutdown
The module can be shut down by the following controls:
Shutdown Control Action Condition
Software Sending AT+CFUN=0 command Normal shutdown(recommend)
Hardware Pull down FCPO# pin
Only used when a hardware exception
occurs and the software control cannot be
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
sd
time (t
sd
is the time which AP receive OK of “AT+CFUN=0”, if there is no
response, the max t
sd
is 5s). In the finalization process, the module will save the network, SIM card and
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
PERST#
t
pd
RESET#
Module State
FinalizationActivation
FCPO#
t
off1
t
sd
OFF
AT+CFUN=0
t
off2
Figure 3-6 Shutdown timing control
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.
Index Min. Recommended
Comments
t
off1
16ms
20ms
RESET# should be asserted after PERST#
t
off2
2ms 10ms
FCPO# should be asserted after RESET#
t
pd
10ms 100ms
+3.3V power supply goes down time. If power supply is
always on, it can be ignored
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