NINA-B1 series - System integration manual
UBX-15026175 - R16
Design-in
Page 36 of 63
C1-Public
3
Design-in
3.1
Overview
For an optimal integration of NINA-B1 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, several 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 antenna connection:
Ant
pad.
Antenna circuit affects the RF compliance of the device integrating NINA-B1 modules with applicable
certification schemes. Follow the recommendations provided in section 0 for schematic and layout
design.
2)
Module supply:
VCC
,
VCC_IO
, and
GND
pins.
The supply circuit affects the performance of the device integrating NINA-B1 series module. Follow
the recommendations provided in section 3.4 for schematic and layout design.
3)
Analog signals: GPIO
Analog signals are sensitive to noise and should be routed away from high frequency signals.
4)
High speed interfaces:
UART, SPI
and
SWD
pins.
High speed interfaces can be a source of radiated noise and can affect compliance with regulatory
standards for radiated emissions. Follow the recommendations provided in sections 3.5.1 and 2.4.2
for schematic and layout design.
5)
System functions: RESET_N, I2C, GPIO and other System input and output pins.
Accurate design is required to guarantee that the voltage level is well defined during module boot.
6)
Other pins:
Accurate design is required to guarantee proper functionality.
3.2
Module placement precautions
⚠
NINA-B1 should be placed in such a way that the module is not subject to direct contact. ESD
precaution must be taken if any parts or signals are accessible to the end user. See chapter 3.10
for information about ESD.
⚠
NINA-B112 has an internal antenna that is sensitive to physical force and the end product must
be designed in such a way that no physical force may be applied to the antenna from parts of the
casing in an end product or by the end user.
3.3
Antenna interface
As the unit cannot be mounted arbitrary, the placement should be chosen with consideration so that
it does not interfere with radio communication. With an internal surface mounted antenna,
NINA-B112 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. NINA-B111 offers more freedom as an
external antenna can be mounted further away from the module.
