3: Open-QTM 410 SOM
Open-Q 410 Dev Kit User Guide
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3.1 Carrier Board Connection
The SOM provides the basic common set of features with minimal integration efforts for end users. This is
achieved with two 100-pin board to board connectors that interface the SOM to the carrier board. The
connectors used are the Samtec ST4 / SS4 family providing a 4mm stack height between the SOM and
carrier board. There are also two mounting holes that allow for an M2.5 screw assembly to be used for
securing the two boards together.
3.2 Wi-Fi / BT Antenna Connection
The SOM includes a U.FL coaxial connector on the top side, which provides the connection to the single band
Wi-Fi / BT antenna feed from the WCN3620. The Open-Q 410 Development Kit is shipped with this antenna
feed connected to a PCB trace antenna on the Carrier board with a U.FL coaxial cable.
The SOM has received Wi-Fi modular regulatory certifications (see FCC ID:
for details).
Please note that the on-board PCB antenna is not the antenna used for the SOM Wi-Fi/BT module
certification.
3.3 GPS Antenna Connection
The SOM includes a U.FL coaxial connector on the top side, which provides the connection to the GPS
antenna feed from the WGR7640. The user can gain access to GPS location data by connecting an external
active antenna to the GPS connector on the SOM. The GPS connector can only supply 1.8V DC, so an
external active antenna that can operate at 1.8V DC is required. A possible GPS antenna to use is the
Taoglas AP.17F.07.0064A.
A passive antenna can be used only if the antenna is DC-open
. A passive
antenna that has a DC-short will disable GPS function or damage the system. For reference, system is tested
with a passive antenna (Taoglas FXP611.07.0092C) to assure functionality
