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L830-EB Hardware User Manual Page 19 of 39
3.3.1.2 Start-up Timing Sequence
After powering on, the module will start-up by pulling up the FULL_CARD_POWER_OFF# signal for more
than 20ms (100ms is recommended). Meanwhile, the module will output 1.8V voltage through VSD2_1V8
pin and start the initialization process. The start-up timing is shown in Figure 3-6:
≥20ms
+3.3V
FULL_CARD_POWER_OFF#
VSD2_1V8
tpr
RESET#
≥100ms
Module State
OFF Initialization Activation(AT Command Ready)
10s
Figure 3-6 Timing Control for Start-up
Note:
The VSD2_1V8 signal is the internal PMU 1.8V output voltage which is not connected to the M.2
interface. The above timing of VSD2_1V8 is only for reference.
t
pr
:The time for 3.3V power rail becomes stable due to the capacitor charging.If + 3.3 V keeps
constant supply, the delay time can be ignored.
3.3.2 Module Shutdown
The module can be shutdown by the following controls:
Sending AT+CFUN=0 command
Pull down
FULL_CARD_POWER_OFF# pin
Only used when a hardware exception occurs
and the software control cannot be used.
3.3.2.1 Software Shutdown
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
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