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LN930 M.2 Hardware User Guide
1VV0301078 Rev.10 – 2015-11-11
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Page 34 of 88
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:
Enable, ON (3.3V): The radio transmitter is to be made capable of transmitting.
Disable, OFF (low): The radio transmitter(s) is to be made incapable of transmitting.
Standard TTL signaling levels shall be used making it compatible with 1.8 V and 3.3 V
signaling.
W_DISABLE# pin has a pull-up resistor on the M.2 module.
Table 11 Radio Disable Signal
Signal Name
Detailed Description
Pin
Direction
(WWAN)
Voltage
Level
W_DISABLE#
Disable Radio.
This active low signal
allows the host to disable the M.2 radio
operation in order to meet public safety
regulations or when otherwise desired.
•
Logic Low: M.2 Off
•
Logic High: function is
determined by Software (AT
Command).
If this pin is left un-connected,
functionality is controlled by software.
Care should be taken not to activate this
pin unless there is a critical failure and
all other methods of regaining control
and/or communication with the M.2
module have failed.
8
I
Compatible
with
1.8 V/3.3
V
Standard TTL signaling levels shall be used.