xN930 M.2 Hardware User Guide
3.5
Tunable Antenna Control Interface
In notebook platforms, since the WWAN antennas are usually located on the top of the lid,
there is a long RF mini-coax cable that can be up to 60 cm long between the antenna and
WWAN module, it is preferred to use switches/tunable components directly on the antenna
for antenna band switching/tuning to improve efficiency.
On select WWAN M.2 modules, four (4) GPOs are available on the host interface that can be
connected to an external antenna switch, to load the antenna with different impedances,
configuring the different frequency responses for the main antenna. A sample block diagram
depicting the antenna control signal connections to the antenna switch is shown in Figure 8
Intel’s current antenna control solution offers an open loop control solution. The WWAN
M.2 modem expects the AP to provide the antenna profile detection and through a pre-
defined API, notify the WWAN M.2 modem with the correct antenna profile. The WWAN
M.2 modem then applies the proper antenna profile data accordingly.
Figure 8 Antenna Control – Connections Detail
The electrical specification for the antenna control GPIOs are shown in Table 16
Table 16 Tunable Antenna Control Signals
Signal
Name
Description
Smarti™ 4G Signal
Pin
Direction
(WWAN)
Voltage
Level
ANTCTL0
Antenna Control 0
GPO8
59
O
1.7 – 2.6 V
ANTCTL1
Antenna Control 1
RFFE2_SDATA/ GPO9
61
O
1.7 – 2.6 V
ANTCTL2
Antenna Control 2
RFFE2_SCLK/ GPO10
63
O
1.7 – 2.6 V
ANTCTL3
Antenna Control 3
RFFE2_VIO/ GPO11
65
O
1.7 – 2.6 V
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