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2
Design-in
2.1 Overview
For an optimal integration of LENA-R8 series modules in the final application board, follow the design
guidelines stated in this section.
Every application circuit must be properly designed to ensure the correct functionality of the related
interface, but a number of points require greater attention during the design of the application device.
The following list provides a ranking of importance in the application design, starting from the highest
priority:
1.
Module antenna connection: ANT, ANT_GNSS and ANT_DET pins.
Antenna circuit directly affects the RF compliance of the device integrating a LENA-R8 series
module with the applicable certification schemes. Very carefully follow the suggestions provided
in section
2.4
2.
Module supply: VCC, VCC_GNSS and GND pins.
The supply circuit affects the RF compliance of the device integrating a LENA-R8 series module
with applicable certification schemes as well as antenna circuit design. Very carefully follow the
suggestions provided in section
3.
USB interface: USB_D+, USB_D- and VUSB_DET pins.
Accurate design is required to ensure USB 2.0 high-speed interface functionality. Carefully follow
the suggestions provided in the related section
4.
SIM interface: VSIM, SIM_CLK, SIM_IO, SIM_RST pins.
Accurate design is required to ensure SIM card functionality and compliance with applicable
conformance standards, also reducing the risk of RF coupling. Carefully follow the suggestions
provided in section
5.
System functions: RESET_N, PWR_ON pins.
Accurate design is required to ensure that the voltage level is well defined during operation.
Carefully follow the suggestions provided in section
6.
Other digital interfaces: UARTs, I2C, I2S, GPIOs, GNSS PIOs and Reserved pins.
Accurate design is required to ensure proper functionality and reduce the risk of digital data
frequency harmonics coupling. Follow the suggestions provided in 2.6.1, 2.6.3, 2.7.1,
for schematic and layout design.
7.
Other supply: the V_INT output, V_BCKP input, VBCKP_GNSS input.
Accurate design is required to ensure proper functionality. Follow the suggestions provided in
sections
2.2.3
☞
It is recommended to follow the specific design guidelines provided by each manufacturer of any
external part selected for the application board integrating the u-blox cellular modules.
UBX-22015376 - R02
C1-Public
for schematic and layout design.
2.2.1
2.5
for schematic and layout design.
for schematic and layout design.
LENA-R8 series - System integration manual
for schematic and layout design.
2.6.2
for schematic and layout design.
2.3
for schematic and layout design.
Design-in
2.8
and
2.9
Page 32 of 116
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