ODIN-W2 series - System integration manual
UBX-14040040 - R20
Design-in
Page 23 of 43
C1-Public
3
Design-in
3.1
Overview
For an optimal integration of ODIN-W2 series modules in the final application board, it is
recommended to follow the design guidelines stated in this chapter. Every application circuit must be
properly designed to guarantee the correct functionality of the related interface, however a number
of points require high attention during the design of the application device.
The following list provides important points sorted by rank of importance in the application design,
starting from the highest relevance:
1.
Module supply:
VCC
,
V_INT
, and
GND
pins.
The supply circuit affects the performance of the device integrating ODIN-W2 series. Follow the
recommendations provided in section 3.3 for schematic and layout design.
2.
High speed interfaces:
RMII
and
UART
pins.
High speed interfaces can be a source of radiated noise and can affect the compliance with
regulatory standards for radiated emissions. Follow the recommendations provided in section 3.4
and 3.6 for schematic and layout design.
3.
System functions: RESET_N and other System input and output pins.
Accurate design is required to guarantee that the voltage level is well defined during module boot.
Follow the recommendations provided in section 3.6 for schematic and layout design.
4.
Other pins:
Accurate design is required to guarantee proper functionality. Follow the recommendations
provided in section 3.6 for schematic and layout design.
3.2
Antenna interface design
As the unit cannot be mounted arbitrary, the placement should be chosen with consideration so that
it does not interfere with radio communication. The ODIN-W262 with an internal surface mounted
antenna cannot be mounted in a metal enclosure. No metal casing or plastics using metal flakes
should be used. Avoid metallic based paint or lacquer as well. The ODIN-W260 offers more freedom
as an external antenna can be mounted further away from the module.
3.2.1
Antenna connectors
The ODIN-W260 is equipped with dual U.FL connectors. The main antenna connector port is
mandatory while the MIMO antenna connector is optional and used only in MIMO applications. See
Figure 4.
The external antennas are connected to the board through U.FL connectors. Some of the antennas
are connected directly to the U.FL connector of the board and some are connected using an SMA or
reversed polarity SMA connector through a short U.FL to SMA or reversed polarity SMA adapter cable.
In general, antennas with SMD connection, Reverse Polarity SMA connector or U.FL connector are
included in FCC, IC, R&TTE and MIC radio tests. The antennas with SMA connector are included in
R&TTE and MIC radio tests but not in FCC or IC due to FCC/IC regulations.
Antenna accessories and recommended antennas can be found in
ODIN-W2 series Data sheet [2].
