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xN930 M.2 Hardware User Guide
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 9 Power-on & Reset Signals
Signal Name
Description
Pin
Direction
(WWAN)
Voltage
Level
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
47k series resistor connected to 3.3V.
6
I
1.8 V
RESET#
Reset the WWAN system. For Tablet based designs,
this signal is used to reset the module.
•
Asynchronous, active low signal. When
active, the WWAN M.2 module will be placed
in a power–on reset condition.
Ultrabook designs,
this signal is not used.
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.
Signal W_DISABLE# is provided to allow users to disable, via a system-provided switch,
the add-in card’s radio operation in order to meet public safety regulations or when
otherwise desired. Implementation of this signal is required for systems and all add—in
cards that implement radio frequency capabilities.
The W_DISABLE1 signal is an active low signal that when driven low by the system shall
disable radio operation. The assertion and de-assertion of the W_DISABLE# signal is
asynchronous to any system clock. All transients resulting from mechanical switches need to
be de-bounced by the host system and no further signal conditioning will be required. When
the W_DISABLE# signal is asserted, all radios attached to the add-in card shall be disabled.
When the W_DISABLE# is not asserted or in a high impedance state, the radio may transmit
if not disabled by other means such as software.
The operation of the W_DISABLE# Signal is:
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