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FM350-GL Hardware Guide Page 28 of 67
+3.3V
PERST#
tpr
RESET#
ton1
Module State
Initialization Activation(AT Command Ready)
FCPO#
ton2
typical 20s
OFF
Figure 3-5 Timing control for start-up
The delay time of power supply rising from 0V up to 3.3V.If
power supply always ready, it can be ignored
RESET# should be de-asserted after FCPO#
The time delay of PERST# de-asserted after FCPO#,
PERST# must always be the last to get de-asserted
The minimum detection time of PCIe link is about 23ms after PERST# de-asserted.
Module Shutdown
Module can be shut down by following control:
Sending AT+CPWROFF command
Normal shutdown (recommend)
Only used when a hardware exception
occurs and the software control cannot be
used.
Module can be shut down by sending AT+CPWROFF 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+CPWROFF”, 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 control
timing is shown in Figure 3-6:
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