Integration Manual
Table Of Contents
- Document information
- Contents
- 1 System description
- 1.1 Overview
- 1.2 Architecture
- 1.3 Pin-out
- 1.4 Operating modes
- 1.5 Supply interfaces
- 1.5.1 Module supply input (VCC)
- 1.5.1.1 VCC supply requirements
- 1.5.1.2 VCC current consumption in LTE connected mode
- 1.5.1.3 VCC current consumption in 2G connected mode
- 1.5.1.4 VCC current consumption in ultra low power deep sleep mode
- 1.5.1.5 VCC current consumption in low power idle mode
- 1.5.1.6 VCC current consumption in active mode (PSM / low power disabled)
- 1.5.2 Generic digital interfaces supply output (V_INT)
- 1.5.1 Module supply input (VCC)
- 1.6 System function interfaces
- 1.7 Antenna interfaces
- 1.8 SIM interface
- 1.9 Data communication interfaces
- 1.10 Audio
- 1.11 General Purpose Input/Output
- 1.12 GNSS peripheral input output
- 1.13 Reserved pins (RSVD)
- 2 Design-in
- 2.1 Overview
- 2.2 Supply interfaces
- 2.2.1 Module supply (VCC)
- 2.2.1.1 General guidelines for VCC supply circuit selection and design
- 2.2.1.2 Guidelines for VCC supply circuit design using a switching regulator
- 2.2.1.3 Guidelines for VCC supply circuit design using LDO linear regulator
- 2.2.1.4 Guidelines for VCC supply circuit design using a rechargeable battery
- 2.2.1.5 Guidelines for VCC supply circuit design using a primary battery
- 2.2.1.6 Guidelines for external battery charging circuit
- 2.2.1.7 Guidelines for external charging and power path management circuit
- 2.2.1.8 Guidelines for particular VCC supply circuit design for SARA-R4x2
- 2.2.1.9 Guidelines for removing VCC supply
- 2.2.1.10 Additional guidelines for VCC supply circuit design
- 2.2.1.11 Guidelines for VCC supply layout design
- 2.2.1.12 Guidelines for grounding layout design
- 2.2.2 Generic digital interfaces supply output (V_INT)
- 2.2.1 Module supply (VCC)
- 2.3 System functions interfaces
- 2.4 Antenna interfaces
- 2.5 SIM interface
- 2.6 Data communication interfaces
- 2.7 Audio
- 2.8 General Purpose Input/Output
- 2.9 GNSS peripheral input output
- 2.10 Reserved pins (RSVD)
- 2.11 Module placement
- 2.12 Module footprint and paste mask
- 2.13 Thermal guidelines
- 2.14 Schematic for SARA-R4 series module integration
- 2.15 Design-in checklist
- 3 Handling and soldering
- 4 Approvals
- 4.1 Product certification approval overview
- 4.2 US Federal Communications Commission notice
- 4.3 Innovation, Science, Economic Development Canada notice
- 4.4 European Conformance CE mark
- 4.5 National Communication Commission Taiwan
- 4.6 ANATEL Brazil
- 4.7 Australian Conformance
- 4.8 GITEKI Japan
- 4.9 KC South Korea
- 5 Product testing
- Appendix
- A Migration between SARA modules
- B Glossary
- Related documentation
- Revision history
- Contact
SARA-R4 series - System integration manual
UBX-16029218 - R20 System description Page 36 of 129
C1-Public
1.9 Data communication interfaces
SARA-R4 series modules provide the following serial communication interfaces:
• UART interfaces: asynchronous serial interface supporting AT commands, data communication,
GNSS tunneling, FW update by means of FOAT. See section 1.9.1.
• USB interface: High-Speed USB 2.0 compliant serial interface supporting AT commands
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, data
communication
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, FW update by means of the FOAT feature
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, FW update by means of the u-blox
EasyFlash tool and diagnostic trace logging. See section 1.9.2.
• SPI interface
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: Serial Peripheral Interface for compatible devices. See section 1.9.3.
• SDIO interface
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: Secure Digital Input Output interface for compatible device. See section 1.9.4.
• DDC interface: I2C bus compatible interface supporting communication with external u-blox GNSS
positioning chips or modules
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and with external I2C devices. See section 1.9.5.
1.9.1 UART interfaces
1.9.1.1 UART features
SARA-R4 series modules include a primary main UART interface (UART) for communication with an
application host processor, supporting AT commands, data communication, multiplexer protocol
functionality (see 1.9.1.3), FW update by means of FOAT, with settings configurable by dedicated AT
commands (for more details, see the SARA-R4 series AT commands manual [2]):
• 8-wire serial port with RS-232 functionality conforming to ITU-T V.24 recommendation [6], with
CMOS compatible signal levels (0 V for low data bit / ON state, 1.8 V for high data bit / OFF state)
o Data lines (RXD as data output, TXD as data input)
o HW flow control lines (CTS as flow control output, RTS as flow control input)
o Modem status and control lines (DTR input, DSR output, DCD output, RI output)
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• The default baud rate is 115’200 b/s
• The default frame format is 8N1 (8 data bits, no parity, 1 stop bit)
☞ The UART is available only if the USB is not enabled as AT command / data communication
interface: UART and USB cannot be concurrently used for this purpose.
☞ UART signal names of the cellular modules conform to the ITU-T V.24 recommendation [6]: e.g.
TXD line represents data transmitted by the DTE (host processor output) and received by the DCE
(module input).
☞ Hardware flow control is not supported by the SARA-R410M-01B and SARA-R410M-02B product
versions. The RTS input line needs to be set low (= ON state) to communicate over the UART on
the SARA-R410M-01B product versions.
☞ DTR input of the module must be set low (= ON state) to have URCs presented over UART interface
on the SARA-R410M-01B, SARA-R410M-02B, SARA-R410M-52B and SARA-R412M-02B product
versions of SARA-R4 series modules.
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Not supported by SARA-R422-00B, SARA-R422S-00B and SARA-R422M8S-00B modules
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Not supported by the current product versions of the SARA-R410M and SARA-R412M modules. Not available on the SARA-R422,
SARA-R422S and SARA-R422M8S modules.
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Dedicated AT commands to communicate with external u-blox GNSS receiver are not supported by SARA-R410M-01B, SARA-R422,
and SARA-R422M8S product versions
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DTR, DSR, DCD and RI pins can be alternatively configured, in mutually exclusive way, as secondary auxiliary UART interface (UART
AUX) on SARA-R422, SARA-R422S and SARA-R422M8S modules.