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Product Technical Specification & Customer Design Guidelines
36
Proprietary and Confidential - Contents subject to change
W_DISABLE_N and GPS_EN_N — Wireless
disable
The host device uses:
W_DISABLE_N
•
(pin 20) to enable / disable the WWAN or radio modem. When
disabled, the modem cannot transmit or receive information.
GPS_EN_N
•
(pin 51) to enable / disable GPS functionality on the device.
(Support for this signal is firmware dependent. Contact your Sierra Wireless
account representative to determine specific availability.)
Letting these signals float high allows the module to operate normally. These
switches follow the behavior described in [10] PCI Express Mini Card
Electromechanical Specification Revision 1.2. These pins have 20 k pull-up
resistors. See
Figure 4-6 on page 36
When integrating with your host device, keep the following in mind:
•
The signal is an input to the module and should be driven LOW only for its
active state (controlling the power state); otherwise it should be floating or
(High impedance). It should never be driven to a logic high level. The module
has an internal pull-up resistor to Module Power (3.3V) in place, so if the
signal is floating or (high impedance), the module will power on.
•
Wait for two seconds after asserting W_DISABLE_N before disconnecting
power.
•
If the host never needs to assert this power state control to the module, leave
this signal unconnected from the host interface.
Wireless disable control
(W_DISABLE_N;
GPS_EN_N)
Host
Figure 4-6: Recommended wireless disable connection
for a recommended implementation.
3.3V
20k
1
R
3
Q
2
MiniCard
2400089
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