Telit Wireless Solutions LN930-AP - Power on & Reset; Host Radio Disable Operation

LN930 M.2 Hardware User Guide
1VV0301078 Rev.10 – 2015-11-11
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 33 of 88
3.4.1
Power On & Reset
The host processor has two signals that can be used to power on and reset the modem.
Powering off the modem is accomplished through an AT command.
Table 10
Power-on & Reset Signals
Signal Name
Description
Pin
Direction
(WWAN)
Voltage
Level
FULL_CARD_POWER_ON_OFF
Modem power on: For Tablet based designs
only; this signal is used for power on-off
control of
X-GOLD™ Baseband IC.WWAN M.2
module
• Logic Low: M.2 Off
• Logic High: WWAN M.2 Power On
This pin has an internal pull-down resistor.
Ultrabook designs:
Ultrabook host should deliver a 1.8V signal
to turn on the module. If 1.8V is not feasible,
recommend using a 47kΩ series resistor
connected to 3.3V.
6
I
1.8 V
RESET#
Reset the WWAN system. This signal is
used to reset the module.
This signal is part of the modem rigorous
power-off procedure. The host will first
assert this signal, followed by assertion of:
• FULL_CARD_POWER_OFF# signal (for
Tablet)
• Switch off 3.3V regulator (for Ultrabook)
Asserting RESET first is to trigger PMU
internal state machine to run shutdown
sequences e.g. for SIM and external
memory controller (EMIC), before
switching off power supplies.
• Asynchronous, active low signal. When
active, the WWAN M.2 module will be
placed in a power–on reset condition.
RESET# pin has a pull-up resistor on the
WWAN M.2 module
67
I
1.8 V
3.4.2
Host Radio Disable Operation
An additional control signal is used to disable the radio on the module.