Fibocom L831-EAU-01 - Start-up Timing Sequence; Module Shutdown

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L831-EAU-01 Hardware User Manual Page
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3.3.1.2 Start-up Timing Sequence
For the above two different power-on circuits, there are the following two power-on timings after the
module powered on:
 AP (Application Processor) controls 3.3V power module for powering on, the power-on timing is
shown in Figure 3-5:

Battery-powered, AP controls FULL_CARD_POWER_OFF# module for powering on, the power-on
timing is shown in Figure 3-6:
Figure 3-5 Power-on Timing Diagram of AP Controlling the Power
Figure 3-6 Power-on Timing Diagram of AP Controlling FULL_CARD_POWER_OFF#
Note:
When AP controls FULL_CARD_POWER_OFF# for powering on, RESET# shall be pulled up at
least 1ms in advance.
3.3.2 Module Shutdown
The module can be shut down by software or hardware control:
Shutdown Control
Action
Condition
Software
Sending AT+CPWROFF command
Normal shutdown.
Hardware
AP controlling 3.3V power module for
powering off
AP controlling FULL_CARD_POWER_OFF#
for powering off (battery-powered)
Only used when a hardware
exception occurs and the software
control cannot be used