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L830-EB-11 Hardware User Manual
Page 19 of 39
Figure 3-6 Timing Control for Start-up
Index
Minimum
Typical
Notes
t
pr
The time for +3.3 V stable output.If + 3.3 V keeps constant supply,
the delay time can be ignored.
t
on
20ms
100ms
The time difference between the RESET # signal and the
FULL_CARD_POWER_OFF # signal.
3.3.2 Module Shutdown
The module can be shutdown by the following controls:
Shutdown
Control
Action
Condition
Software
Sending AT+CFUN=0 command
Normal shutdown.
Hardware
Pull down
FULL_CARD_POWER_OFF# 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 module receives the software
shutdown command, it will start the finalization process (the reverse process of initialization), then it will
shut down after t
sd
time(AP received “OK” from “AT+CFUN=0” command, if AP can’t received “OK” the
time is 5s maxim).In the finalization process, the module will save the network, SIM card and some other
parameters from memory, then clear the memory and PMU will be powered off. The software control
timing is shown in Figure 3-7:
