Note: Do not use any pull-up resistor on the RESET_N line or any
totem pole digital output. Using a pull-up resistor may cause latch-
up problems on the LM940 power regulator and improper
functioning of the module. The RESET_N line must be connected only
in an open-collector configuration.
Dying Gasp
If any major issue occurs within the Host System, the host itself can use the dying gasp
function by notifying the LM940 module.
One of GPIOs can be configured as Dying Gasp Trigger by means of AT commands.
Once the Dying Gasp Trigger receives a HIGH to LOW transition, the dying gasp procedure
is triggered: the LM460 will send the specified SMS and then initiate fast shutdown.
Figure 12: Dying Gasp by GPIO, Max Power Non-CA, Current :500mA, 3.3V
Usually dying gasp feature is completed less than 1 second after triggered.
This may take longer depending on network conditions.
Communication Ports
Below table summarizes all the hardware interfaces of the LM940 module.
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