User's Manual

L830-EA M.2 Module Hardware User Manual Page
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Figure 5- 1 Power on Timing Control Diagram
Note : the“>1s”of VBAT is the time aim at the module power supply(that is the capacitance charging). If
the VBAT is already set up or supplied in the long term, then the control time that aimed at VBAT can
ignore and only control the“ RESET_N”and “POWER_ON/OFF# ” .
5.2.1.2 Power off signal
L830-EA M.2 module supports two power_off modes. Through the software modes to turn off the module
in general condition. Only the system halted or happened exceptions, use the following hardware modes
to turn off it, pull down the FUL_CARD_POWER_OFF# signal or floating
①
. For details as listed below:
Off modes
Methods
Condition
Software off
Send AT+CPWROFF commands.
Normal power_off
Hardware off
Pull down the
FUL_CARD_POWER_OFF# signal
or floating
①
Only used for system halted or happens
exceptions and the software modes cannot be
used.
The description of hardware power_off as follows (Pull down the FUL_CARD_POWER_OFF signal or
floating) :
While pulling down the FUL_CARD_POWER_OFF signal or floating, the modules` PMU (Power
Management Unit) will be reset, then the module will get into off modes from working modes.
Note ①: the RESET_N must be pulled down before pulling down the FUL_CARD_POWER_OFF signal,
and then the module will be turned off safely.
The timing sequence requirements of the pulse are as follows:
Parameter
Condition
Minimum Value
Typical Value
Maximum Value
Unit
Pulse Width
Power off
5
100
ms
The timing sequence control is shown in the diagram below: