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FIBOCOM L860-GL Series Hardware Guide
Page 28 of 60
+3.3V
PERST#
t
pr
RESET#
t
on
1
Module State
Initialization
Activation(AT Command Ready)
FCPO#
t
on
2
typical 15s
OFF
Figure 3-5 Timing control for start-up
Index Min.
Recommended Max.
Comment
t
pr
0ms
-
-
The delay time of power supply rising from 0V up to
3.135V. If power supply always ready, it can be ignored
t
on1
8ms
20ms
-
RESET# should be de-asserted after FCPO#
t
on2
50ms
100ms
-
The time delay of PERST# de-asserted after FCPO#,
PERST# must always be the last to get de-asserted
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
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, and then clear the memory and shut down PMU. The control
timing is shown in Figure 3-6:
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