User's Guide

LE940B6 HW User Guide
Rev. 2.02
Page 51 of 111 2020-01-10
Turning off the LE940B6 Module
Turning off the device can be done in four different ways:
• Shutdown by software command using AT#SHDN command
• Hardware shutdown using ON_OFF_N pad
• Hardware Unconditional Reset using the RESET_N pad
• Hardware Unconditional Shutdown using the SHDN_N pad
When the device is shut down by a software command or a hardware shutdown, it issues
a detach request to the network, informing the network that the device will not be
reachable any more.
NOTE:
To check if the device has powered off, monitor the VAUX/PWRMON
hardware line. When VAUX/PWRMON goes low, this indicates that the
device has powered off.
NOTE:
To avoid a back-powering effect, it is recommended to avoid having any
HIGH logic level signal applied to the digital pins of the module when it is
powered OFF or during an ON/OFF transition.
NOTE:
VBATT must be never removed before the proper OFF procedure is
performed.
NOTE:
In case VBATT needs to be removed and applied again. The application
must take into account the decay time of the power supply after VBATT is
removed. VBATT input must be at zero volt before VBATT is reapplied.
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Distribution is Prohibited except for
Dekra employees with a Need to know