SARA-R5 series - System integration manual
UBX-19041356 - R04 Design-in Page 40 of 118
C1-Public
2 Design-in
2.1 Overview
For an optimal integration of the SARA-R5 series modules in the final application board, follow the
design guidelines stated in this section.
Every application circuit must be suitably designed to guarantee the correct functionality of the
relative interface, but a number of points require particular 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:
1. Module antennas connection: ANT, ANT_GNSS
and ANT_DET pins.
Antenna circuit directly affects the RF compliance of the device integrating a SARA-R5 series
module with applicable certification schemes. Follow the suggestions provided in the relative
section 2.4 for schematic and layout design.
2. Module supply: VCC and GND pins.
The supply circuit affects the RF compliance of the device integrating a SARA-R5 series module
with the applicable required certification schemes as well as the antenna circuits design. Very
carefully follow the suggestions provided in the relative section 2.2.1 for schematic and layout
design.
3. SIM interface: VSIM, SIM_CLK, SIM_IO, SIM_RST pins.
Accurate design is required to guarantee SIM card functionality reducing the risk of RF coupling.
Carefully follow the suggestions provided in relative section 2.5 for schematic and layout design.
4. System functions: PWR_ON and RESET_N pins.
Accurate design is required to guarantee that the voltage level is well defined during operation.
Carefully follow the suggestions provided in relative section 2.3 for schematic and layout design.
5. Other digital interfaces: UART, USB, SPI, SDIO, I2C, I2S and GPIOs.
Accurate design is required to guarantee correct functionality and reduce the risk of digital data
frequency harmonics coupling. Follow the suggestions provided in sections 2.6, 2.7 and 2.8 for
schematic and layout design.
6. Other supplies: V_INT generic digital interfaces supply.
Accurate design is required to guarantee correct functionality. Follow the suggestions provided
in the corresponding section 2.2.2 for schematic and layout design.
☞ 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.
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