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FM350-GL Hardware Guide
Page 22 of 59
Module Shutdown
Module can be shut down by following control:
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
used.
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, then clear the memory and shut down PMU. The software control
timing is shown in Figure 3-6:
+3.3V
PERST#
t
pd
RESET#
Module State
Finalization
Activation
FCPO#
t
off1
t
sd
OFF
AT+CFUN=0
t
off2
Figure 3-6 Software control power off timing
Index Min.
Recommended Max.
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
Module Reset
The FM350 module can reset to its initial status by pulling down the RESET# signal for more than 2ms
(10ms is recommended), and module will restart after RESET# signal is released. When customer
executes RESET# function, the PMU remains its power inside the module. The recommended circuit
design is shown in the Figure 3-7: