Telit Wireless Solutions LN940 WWAN M.2, User Manual

Page: 26 / 56

System Control Interface
The system control interface is used to control the power-up and reset of the
WWAN M.2 Module. There are additional control signals to disable the radio,
drive the LED as status indicator, an output to wake up the host and an input
trigger for body SAR
3.3.1. Power On & Reset
The host platform has two signals to power on/off and reset the WWAN M.2
module
Table 3.3-1 Power On & Reset Interface
Signal Name Pin Voltage
Level Description
FULL_CARD_POWER_OFF 6 3.3 V or
1.8V This is an “Active Low”
pin. When the state is
“Low” the M.2 module
powers off, internally
pulled down by 100K
ohm resister. When the
state is “High” the M.2
module powers on and it
should be 3.3 V tolerant.
Also, 1.8V is supported
as well.
RESET# 67 1.8V Asynchronous RESET#
pin is an “Active Low”
pin. Whenever this
active the M.2 module
will immediately be
taken and placed in the
Power On reset
condition. M.2 Module is
NOT recommended to
activate this pin unless
there is a critical failure
or all other approaches
of regaining control
and/or communication
with M.2 Module have
failed. It is
recommended to install
one capacitor (10-
100pF)
close to the M.2
module pin.