JODY-W2 - System integration manual
UBX-18068879 - R14
Design-in
Page 20 of 84
C1 - Public
2
Design-in
2.1
Overview
For an optimal integration of JODY-W2 series modules in the final application board, it is advisable to
follow the design guidelines described in this chapter. Every application circuit must be properly
designed to ensure that the related interface functions correctly, but several specific points require
special attention during the design of the application device.
The following list provides a rank of importance in the application design, starting from the highest
relevance:
•
Module antenna connection:
ANT0
and
ANT1
pins.
Antenna circuit affects the RF compliance of the device integrating JODY-W2 modules with
applicable certification schemes. For schematic and layout design recommendations, see also
•
Module supply:
VBAT
,
VIO
/
1V8
, and
GND
pins.
The supply circuit affects the RF compliance of the device integrating JODY-W2 modules with
applicable certification schemes. Follow the
General high-speed layout guidelines
•
High speed interfaces:
SDIO
pins.
High speed interfaces can be a source of radiated noise and can affect the compliance with
regulatory standards for radiated emissions. Follow the
General high-speed layout guidelines
recommendations for the
•
System functions:
PDn
and pins described as
Accurate design is required to ensure that the voltage level is well defined during module boot.
Follow the
General high-speed layout guidelines
•
Other pins: High speed
UART
,
PCM
,
specific signals
and
NC
pins.
Accurate design is required to ensure proper functionality. Follow the
2.2
Antenna interfaces
JODY-W2 modules provide the following two RF interfaces for connecting the external antennas:
•
The
ANT0
port for Bluetooth connectivity.
•
The
ANT1
port for Wi-Fi connectivity.
Both the
ANT0
and the
ANT1
ports have a nominal characteristic impedance of 50
and must be
connected to the related antenna through a 50
transmission line to allow proper impedance
matching along the RF path. A bad termination of the
ANT0
pin (Bluetooth) or the
ANT1
pin (Wi-Fi)
may result in poor performance of the module.
For the dual antenna modules, the isolation between the two antennas should be maximized, the
requirements specified in
should be followed to ensure good performance.
⚠
According to FCC regulations, the transmission line from the antenna pin in the module to the
antenna or antenna connector on the host PCB is considered part of the approved antenna design.
Consequently, module integrators must either follow exactly one of the antenna reference design
used in the module’s FCC type approval or certify their own designs.
See also the JODY-W2
antenna reference design
