3: Open-Q 660 µSOM Development Kit
Open-Q™ 660 µSOM Dev Kit User Guide
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3.7.20
Audio Headset Jack J1800 (8)
In addition to expansion headers, the user can use standard 3.5mm Audio Headset Jack J1800 directly, which
provides stereo output to headphone, microphone input and headset detection circuits.
Figure 23. Audio Headset Jack J1800 (8)
3.7.21
WLAN / BT Antenna Connections
The Open-Q 660 µSOM Development Kit WLAN/BT functionality is based on Qualcomm WCN3990 chipset. It
provides WLAN/Bluetooth in 2x2 MIMO with two spatial streams IEEE802.11 a/b/g/n/ac WLAN standards, and
Blu LE 5.x + HS enabling seamless integration of WLAN/Bluetooth and low energy technology.
The chipset is placed on SOM which has U.FL coax connectors for channel 0 (WLAN+BT) and channel 1
(WLAN only). These connectors are mated to the Carrier board WLAN / BT PCB antennas via coax cables.
The two images below show the two channels of the WLAN / BT connections on SOM and how they are
routed on carrier board.
Figure 24. WLAN / BT SOM Connections (21, 22)
