Ublox SARA-G3 Series Quick setup guide

SARA-G3 series
GSM/GPRS modules
System Integration Manual
Abstract
This document describes the features and the system integration
of SARA-G3 series GSM/GPRS wireless modules.
These modules are complete and cost efficient solutions offering
up to quad-band GSM/GPRS voice and/or data transmission
technology in a compact form factor.
www.u-blox.com
26.0 x 16.0 x 3.0 mm
UBX-13000995 - R06

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Document Information
Title
SARA-G3 series
Subtitle
GSM/GPRS modules
Document type
System Integration Manual
Document number
UBX-13000995
Revision, date
R06
29-Nov-2013
Document status
Objective Specification
Document status information
Objective
Specification
This document contains target values. Revised and supplementary data will be
published later.
Advance
Information
This document contains data based on early testing. Revised and supplementary data
will be published later.
Early Production
Information
This document contains data from product verification. Revised and supplementary data
may be published later.
Production
Information
This document contains the final product specification.
This document applies to the following products:
Name
Type number
Firmware version
PCN / IN
SARA-G300
SARA-G300-00S-00
08.58
GSM.G2-TN-13007
SARA-G310
SARA-G310-00S-00
08.58
GSM.G2-TN-13007
SARA-G350
SARA-G350-00S-00
08.49
GSM.G2-TN-13002
SARA-G350 ATEX
SARA-G350-00X-00
08.49
GSM.G2-TN-13002

UBX-13000995 Objective Specification Page 3
This document and the use of any information contained therein, is subject to the acceptance of the u-blox terms and conditions.
They can be downloaded from www.u-blox.com.
u-blox makes no warranties based on the accuracy or completeness of the contents of this document and reserves the right to
make changes to specifications and product descriptions at any time without notice.
u-blox reserves all rights to this document and the information contained herein. Reproduction, use or disclosure to third parties
without express permission is strictly prohibited. Copyright © 2013, u-blox AG.
u-blox®is a registered trademark of u-blox Holding AG in the EU and other countries.
Trademark Notice
Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other
countries. All other registered trademarks or trademarks mentioned in this document are property of their respective owners.

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Preface
u-blox Technical Documentation
As part of our commitment to customer support, u-blox maintains an extensive volume of technical
documentation for our products. In addition to our product-specific technical data sheets, the following
manuals are available to assist u-blox customers in product design and development.
AT Commands Manual: This document provides the description of the supported AT commands by the
SARA-G3 series modules to verify all implemented functionalities.
System Integration Manual: This manual provides hardware design instructions and information on how to
set up production and final product tests.
Application Note: document provides general design instructions and information that applies to all u-blox
Wireless modules. See Related documents section for a list of Application Notes related to your
Wireless Module.
How to use this Manual
The SARA-G3 series System Integration Manual provides the necessary information to successfully design
in and configure these u-blox wireless modules.
This manual has a modular structure. It is not necessary to read it from the beginning to the end.
The following symbols are used to highlight important information within the manual:
An index finger points out key information pertaining to module integration and performance.
A warning symbol indicates actions that could negatively impact or damage the module.
Questions
If you have any questions about u-blox Wireless Integration:
Read this manual carefully.
Contact our information service on the homepage http://www.u-blox.com
Read the questions and answers on our FAQ database on the homepage http://www.u-blox.com
Technical Support
Worldwide Web
Our website (www.u-blox.com) is a rich pool of information. Product information, technical documents and
helpful FAQ can be accessed 24h a day.
By E-mail
Contact the nearest of the Technical Support offices by email. Use our service pool email addresses rather
than any personal email address of our staff. This makes sure that your request is processed as soon as
possible. You will find the contact details at the end of the document.

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Helpful Information when Contacting Technical Support
When contacting Technical Support, have the following information ready:
Module type (e.g. SARA-G350) and firmware version
Module configuration
Clear description of your question or the problem
A short description of the application
Your complete contact details

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Contents
Preface......................................................................................................................................4
Contents ..................................................................................................................................65
1System description.......................................................................................................... 109
1.1 Overview................................................................................................................... 109
1.2 Architecture .............................................................................................................. 1311
1.2.1 Internal blocks..................................................................................................... 1512
1.3 Pin-out ................................................................................................................... 1713
1.4 Operating modes ...................................................................................................... 2317
1.5 Supply interfaces ...................................................................................................... 2619
1.5.1 Module supply input (VCC) ................................................................................ 2619
1.5.2 RTC supply input/output (V_BCKP)...................................................................... 3526
1.5.3 Interfaces supply output (V_INT) .......................................................................... 3627
1.6 System function interfaces .......................................................................................... 3728
1.6.1 Module power-on ............................................................................................... 3728
1.6.2 Module power-off ............................................................................................... 3829
1.6.3 Module reset ..................................................................................................... 3930
1.6.4 External 32 kHz signal input (EXT32K) ................................................................ 4031
1.6.5 Internal 32 kHz signal output (32K_OUT) .............................................................. 4131
1.7 Antenna interface...................................................................................................... 4232
1.7.1 Antenna RF interface (ANT) ............................................................................... 4232
1.7.2 Antenna detection interface (ANT_DET) ................................................................. 4433
1.8 SIM interface ........................................................................................................... 4433
1.8.1 (U)SIM card interface ........................................................................................ 4433
1.8.2 SIM card detection interface (SIM_DET) ................................................................ 4433
1.9 Serial interfaces........................................................................................................ 4634
1.9.1 Asynchronous serial interface (UART).................................................................... 4634
1.9.2 Auxiliary asynchronous serial interface (UART AUX)................................................. 6244
1.9.3 DDC (I2C) interface .......................................................................................... 6244
1.10 Audio interface ...................................................................................................... 6446
1.10.1 Analog audio interface ......................................................................................... 6446
1.10.2 Digital audio interface .......................................................................................... 6748
1.10.3 Voice-band processing system .............................................................................. 6949
1.11 General Purpose Input/Output (GPIO) ...................................................................... 7151
1.12 Reserved pins (RSVD) ......................................................................................... 7453

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1.13 System features .................................................................................................... 7554
1.13.1 Network indication ............................................................................................... 7554
1.13.2 Antenna detection ............................................................................................... 7554
1.13.3 Jamming detection .............................................................................................. 7554
1.13.4 TCP/IP and UDP/IP .......................................................................................... 7755
1.13.5 FTP................................................................................................................. 7755
1.13.6 HTTP............................................................................................................... 7755
1.13.7 SMTP .............................................................................................................. 7755
1.13.8 Smart temperature management ............................................................................. 7956
1.13.9 AssistNow clients and GNSS integration .................................................................. 8258
1.13.10 Hybrid positioning and CellLocateTM ..................................................................... 8459
1.13.11 Firmware upgrade Over AT (FOAT) .................................................................. 8661
1.13.12 Firmware upgrade Over The Air (FOTA) ............................................................ 8761
1.13.13 In-Band modem (eCall / ERA-GLONASS) ........................................................ 8862
1.13.14 Power saving.................................................................................................. 8862
2Design-in...................................................................................................................... 9063
2.1 Supply interfaces ...................................................................................................... 9164
2.1.1 Module supply (VCC) ........................................................................................ 9164
2.1.2 RTC supply (V_BCKP) .....................................................................................10072
2.1.3 Interface supply (V_INT) ...................................................................................10374
2.2 System functions interfaces ........................................................................................10575
2.2.1 Module power-on (PWR_ON).............................................................................10575
2.2.2 Module reset (RESET_N) ..................................................................................10776
2.2.3 32 kHz signal (EXT32K and 32K_OUT) ..............................................................10977
2.3 Antenna interface......................................................................................................11179
2.3.1 Antenna RF interface (ANT) ...............................................................................11179
2.3.2 Antenna detection interface (ANT_DET) ................................................................ 11784
2.4 SIM interface ..........................................................................................................12087
2.5 Serial interfaces....................................................................................................... 12994
2.5.1 Asynchronous serial interface (UART)................................................................... 12994
2.5.2 Auxiliary asynchronous serial interface (UART AUX)................................................ 13397
2.5.3 DDC (I2C) interface ......................................................................................... 13599
2.6Audio Interface.......................................................................................................139102
2.6.1 Analog Audio interface.......................................................................................139102
2.6.2 Digital Audio interface........................................................................................147108
2.7 General Purpose Input/Output (GPIO) ......................................................................149109
2.8 Reserved pins (RSVD) ........................................................................................... 151111
2.9 Module placement .................................................................................................... 151111

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2.10 Module footprint and paste mask............................................................................ 152112
2.11 Thermal guidelines ............................................................................................... 154113
2.12 ESD guidelines ................................................................................................... 156115
2.12.1 ESD immunity test overview ............................................................................... 156115
2.12.2 ESD immunity test of u-blox SARA-G3 series reference designs .............................. 156115
2.12.3 ESD application circuits...................................................................................... 157116
2.13 SARA-G350 ATEX integration in explosive atmospheres applications.............................. 160118
2.13.1 General guidelines ............................................................................................ 160118
2.13.2 Guidelines for VCC supply circuit design ................................................................161119
2.13.3 Guidelines for antenna RF interface design............................................................163120
2.14 Schematic for SARA-G3 series module integration ..................................................... 164121
2.15 Design-in checklist ..............................................................................................168123
2.15.1 Schematic checklist ...........................................................................................168123
2.15.2 Layout checklist................................................................................................170124
2.15.3 Antenna checklist..............................................................................................170124
3Handling and soldering ............................................................................................. 171125
3.1 Packaging, shipping, storage and moisture preconditioning............................................... 171125
3.2 Soldering .............................................................................................................. 171125
3.2.1 Soldering paste ................................................................................................ 171125
3.2.2 Reflow soldering ............................................................................................... 171125
3.2.3 Optical inspection..............................................................................................174127
3.2.4 Cleaning .........................................................................................................174127
3.2.5 Repeated reflow soldering...................................................................................174127
3.2.6 Wave soldering ................................................................................................174127
3.2.7 Hand soldering.................................................................................................174127
3.2.8 Rework...........................................................................................................174127
3.2.9 Conformal coating .............................................................................................175127
3.2.10 Casting...........................................................................................................176128
3.2.11 Grounding metal covers .....................................................................................176128
3.2.12 Use of ultrasonic processes ................................................................................176128
4Approvals .................................................................................................................. 177129
4.1 Product certification approval overview .........................................................................177129
4.2 Federal Communications Commission and Industry Canada notice .....................................179130
4.2.1 Safety Warnings review the structure ....................................................................179130
4.2.2 Declaration of Conformity –United States only.......................................................179130
4.2.3 Modifications ....................................................................................................179130
4.3 R&TTED and European Conformance CE mark ............................................................ 181132

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4.4 Anatel certification...................................................................................................182132
4.5 SARA-G350 ATEX conformance for use in explosive atmospheres...................................183134
5Product Testing ......................................................................................................... 184135
5.1 u-blox in-series production test ................................................................................184135
5.2 Test parameters for OEM manufacturer .......................................................................184135
5.2.1 “Go/No go” tests for integrated devices ..............................................................185136
5.2.2 Functional tests providing RF operation .................................................................185136
Appendix ......................................................................................................................... 188139
AMigration between LISA and SARA-G3 modules...................................................... 188139
A.1 Overview...............................................................................................................188139
A.2 Checklist for migration .............................................................................................189140
A.3 Software migration ...................................................................................................191141
A.4 Hardware migration ..................................................................................................191141
A.4.1 Supply interfaces ...............................................................................................191141
A.4.2 System functions interfaces .................................................................................193142
A.4.3 Antenna interface..............................................................................................195143
A.4.4 SIM interface ...................................................................................................197144
A.4.5 Serial interfaces................................................................................................197144
A.4.6 Audio interfaces................................................................................................198145
A.4.7 GPIO pins ......................................................................................................199145
A.4.8 Reserved pins..................................................................................................199145
A.4.9 Pin-out comparison between LISA and SARA ....................................................... 200146
BMigration between SARA-G3 and SARA-U2 ........................................................... 206151
B.1 Overview...............................................................................................................206151
B.2 Pin-out comparison between SARA-G3 and SARA-U2................................................. 207152
B.3 Schematic for SARA-G3 and SARA-U2 integration...................................................... 209153
CGlossary.................................................................................................................... 210154
Related documents.......................................................................................................... 213156
Revision history............................................................................................................... 215157
Contact ............................................................................................................................ 217159

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1System description
1.1 Overview
SARA-G3 series are versatile 2.5G GSM/GPRS wireless modules in a miniature LGA (Land Grid Array)
form factor.
SARA-G350 is a full feature quad-band GSM/GPRS wireless module with a comprehensive feature set
including an extensive set of internet protocols. SARA-G350 also provides fully integrated access to u-blox
GNSS positioning chips and modules, with embedded A-GPS (AssistNow Online and AssistNow Offline)
functionality.
SARA-G310 and SARA-G300 are respectively quad-band and dual-band GSM/GPRS wireless modules
targeted for high volume cost sensitive applications, providing GSM/GPRS functionalities with a reduced set
of additional features to minimize the customer’s total cost of ownership.
SARA-G3 wireless modules are certified and approved by the main regulatory bodies and operators, and
RIL software for Android and Embedded Windows are available free of charge. SARA-G3 modules are
manufactured in ISO/TS 16949 certified sites. Each module is tested and inspected during production. The
modules are qualified according to ISO 16750 –Environmental conditions and electrical testing for electrical
and electronic equipment for road vehicles.
Table 1Table 1 describes a summary of interfaces and features provided by SARA-G3 modules.

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Module
Data
Rate
Bands
Interfaces
Audio
Functions
GPRS multi-slot class 10
GSM/GPRS quad-band
GSM/GPRS dual-band (900/1800)
UART
SPI
USB
DDC for u-blox GNSS receivers
GPIO
Analog Audio
Digital Audio
Network indication
Antenna detection
Jamming detection
Embedded TCP/UDP
FTP, HTTP, SMTP
SSL
GNSS via Modem
AssistNow software
FW update over AT (FOAT)
FW update over the air (FOTA)
In-band modem
CellLocateTM
Low power idle-mode
ATEX certification
SARA-G300
•
•
2
•
E
SARA-G310
•
•
2
•
E
SARA-G350
•
•
2
•
4
•
•
•
•
•
•
•
•
•
•
A
•
•
•
SARA-G350 ATEX
•
•
2
•
4
•
•
•
•
•
•
•
•
•
•
A
•
•
•
•
A = available upon request
E = 32 kHz signal at EXT32K input pin is required for low power idle-mode
Table 1: SARA-G3 series features summary
1
Table 2Table 2 reports a summary of GSM/GPRS characteristics of SARA-G3 series modules.
Item
SARA-G300
SARA-G310
SARA-G350
GSM/GPRS Protocol Stack
3GPP Release 99
3GPP Release 99
3GPP Release 99
Mobile Station Class
Class B2
Class B2
Class B2
GSM/GPRS Bands
E-GSM 900 MHz
DCS 1800 MHz
GSM 850 MHz
E-GSM 900 MHz
DCS 1800 MHz
PCS 1900 MHz
GSM 850 MHz
E-GSM 900 MHz
DCS 1800 MHz
PCS 1900 MHz
GSM/GPRS Power Class
Class 4 (33 dBm) for 900
Class 1 (30 dBm) for 1800
Class 4 (33 dBm) for
850/900
Class 1 (30 dBm) for
1800/1900
Class 4 (33 dBm) for
850/900
Class 1 (30 dBm) for
1800/1900
Packet Switched Data Rate
GPRS multi-slot class 103
Coding scheme CS1-CS4
Up to 85.6 kb/s DL4
Up to 42.8 kb/s UL4
GPRS multi-slot class 103
Coding scheme CS1-CS4
Up to 85.6 kb/s DL4
Up to 42.8 kb/s UL4
GPRS multi-slot class 103
Coding scheme CS1-CS4
Up to 85.6 kb/s DL4
Up to 42.8 kb/s UL4
1
SARA-G350 ATEX modules provide the same feature set of the SARA-G350 modules plus the certification for use in potentially
explosive atmospheres. Unless otherwise specified, SARA-G350 refers to all SARA-G350 ATEX modules and SARA-G350 modules.
2
Device can be attached to both GPRS and GSM services (i.e. Packet Switch and Circuit Switch mode) using one service at a
time.
3
GPRS multi-slot class 10 implies a maximum of 4 slots in DL (reception) and 2 slots in UL (transmission) with 5 slots in
total.
4
The maximum bit rate of the module depends on the current network settings.

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Item
SARA-G300
SARA-G310
SARA-G350
Circuit Switched Data Rate
Up to 9.6 kb/s DL/UL4
Transparent mode
Non transparent mode
Up to 9.6 kb/s DL/UL4
Transparent mode
Non transparent mode
Up to 9.6 kb/s DL/UL4
Transparent mode
Non transparent mode
Network Operation Modes
I to III
I to III
I to III
Table 2: SARA-G3 series GSM/GPRS characteristics summary

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1.2 Architecture
Memory
V_BCKP(RTC)
V_INT(I/O)
32 kHz
26 MHz
RF
Transceiver
Power
Management
Baseband
ANT SAW
Filter
Switch
PA
VCC (Supply)
32 kHz
Auxiliary UART
SIM Card
UART
Power-On
Reset
Figure 1: SARA-G300 and SARA-G310 modules block diagram
Memory
V_BCKP(RTC)
V_INT(I/O)
26 MHz 32.768 kHz
RF
Transceiver
Power
Management
Baseband
ANT SAW
Filter
Switch
PA
VCC(Supply)
AuxiliaryUART
DDC(for GNSS)
SIM Card Detection
SIM Card
UART
Power-On
Reset
DigitalAudio
Analog Audio
GPIO
AntennaDetection
Figure 2: SARA-G350 modules block diagram

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1.2.1 Internal blocks
SARA-G3 modules consist of the following internal sections: RF, Baseband and Power Management.
RF section
The RF section is composed of the following main elements:
RF transceiver performing modulation, up-conversion of the baseband I/Q signals, down-conversion and
demodulation of the RF received signals. The RF transceiver includes:
Constant gain direct conversion receiver with integrated LNAs
Highly linear RF quadrature GMSK demodulator
Digital Sigma-Delta transmitter GMSK modulator
Fractional-N Sigma-Delta RF synthesizer
3.8 GHz VCO
Digital controlled crystal oscillator
Transmit module, which amplifies the signals modulated by the RF transceiver and connects the single
antenna input/output pin (ANT) of the module to the suitable RX/TX path, via its integrated parts:
Power amplifier
Antenna switch
RX diplexer SAW (band pass) filters
26 MHz crystal, connected to the digital controlled crystal oscillator to perform the clock reference in
active-mode or connected-mode
Baseband and Power Management section
The Baseband and Power Management section is composed of the following main elements:
Baseband processor, a mixed signal ASIC which integrates:
Microprocessor for controller functions
DSP core for GSM/GPRS Layer 1 and audio processing
Dedicated peripheral blocks for parallel control of the digital interfaces
Audio analog front-end
Memory system in a multi-chip package integrating two devices:
NOR flash non-volatile memory
PSRAM volatile memory
Voltage regulators to derive all the system supply voltages from the module supply VCC
SARA-G350 modules have an internal 32.768 kHz crystal connected to the oscillator of the RTC (Real
Time Clock) block that gives the RTC clock reference needed to provide the RTC functions as well as to
reach the very low power idle-mode (with power saving configuration enabled by the AT+UPSV
command).
SARA-G300 and SARA-G310 modules do not have an internal 32.768 kHz crystal: a proper 32 kHz
signal must be provided at the EXT32K input pin of the modules to give the RTC clock reference and to
provide the RTC functions as well as to reach the very low power idle-mode (with power saving
configuration enabled by the AT+UPSV command). The 32K_OUT output pin of SARA-G300 and SARA-

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G310 modules provides a 32 kHz reference signal suitable only to feed the EXT32K input pin, furnishes
the reference clock for the RTC, and allows low power idle-mode and RTC functions support with modules
switched on.

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1.3 Pin-out
Table 3Table 3 lists the pin-out of the SARA-G3 modules, with pins grouped by function.
Function
Pin Name
Module
Pin No
I/O
Description
Remarks
Power
VCC
All
51, 52,
53
I
Module supply
input
VCC pins are internally connected each other.
VCC supply circuit affects the RF performance
and compliance of the device integrating the
module with applicable required certification
schemes.
See section 1.5.11.5.1 for functional description
and requirements for the VCC module supply.
See section 2.1.12.1.1 for external circuit design-
in.
GND
All
1, 3, 5,
14,
20-22,
30, 32,
43, 50,
54, 55,
57-61,
63-96
N/A
Ground
GND pins are internally connected each other.
External ground connection affects the RF and
thermal performance of the device.
See section 1.5.11.5.1 for functional description.
See section 2.1.12.1.1 for external circuit design-
in.
V_BCKP
All
2
I/O
Real Time Clock
supply
input/output
V_BCKP = 2.3 V (typical) generated by
internal regulator when valid VCC supply is
present.
See section 1.5.21.5.2 for functional description.
See section 2.1.22.1.2 for external circuit design-
in.
V_INT
All
4
O
Digital Interfaces
supply output
V_INT = 1.8 V (typical) generated by internal
regulator when the module is switched on.
See section 1.5.31.5.3 for functional description.
See section 2.1.32.1.3 for external circuit design-
in.
System
PWR_ON
All
15
I
Power-on input
High input impedance: input voltage level has to
be properly fixed, e.g. adding external pull-up.
See section 1.6.11.6.1 for functional description.
See section 2.2.12.2.1 for external circuit design-
in.
RESET_N
All
18
I
External reset
input
A series Schottky diode is integrated in the
module as protection, and then an internal 10
kpull-up resistor to V_INT is provided.
See section 1.6.31.6.3 for functional description.
See section 2.2.22.2.2 for external circuit
design-in.
EXT32K
SARA-G300
SARA-G310
31
I
32 kHz input
Input for RTC reference clock, needed to enter
the low power idle-mode and provide RTC
functions.
See section 1.6.41.6.4 for functional description.
See section 2.2.32.2.3 for external circuit
design-in.

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Function
Pin Name
Module
Pin No
I/O
Description
Remarks
32K_OUT
SARA-G300
SARA-G310
24
O
32 kHz output
32 kHz output suitable only to feed the EXT32K
input giving the RTC reference clock, allowing
low power idle-mode and RTC functions support.
See section 1.6.51.6.5 for functional description.
See section 2.2.32.2.3 for external circuit
design-in.
Antenna
ANT
All
56
I/O
RF input/output
for antenna
50 nominal characteristic impedance.
Antenna circuit affects the RF performance and
compliance of the device integrating the module
with applicable required certification schemes.
See section 1.7 for functional description and
requirements for the antenna RF interface.
See section 2.32.3 for external circuit design-in.
ANT_DET
SARA-G350
62
I
Input for antenna
detection
ADC input for antenna detection function.
See section 1.7.2 for functional description.
See section 2.3.2 for external circuit design-in.
SIM
VSIM
All
41
O
SIM supply
output
VSIM = 1.80 V typ. or 2.85 V typ.
automatically generated according to the connected
SIM type.
See section 1.81.8 for functional description.
See section 2.42.4 for external circuit design-in.
SIM_IO
All
39
I/O
SIM data
Data input/output for 1.8 V / 3 V SIM
Internal 4.7 kpull-up to VSIM.
See section 1.81.8 for functional description.
See section 2.42.4 for external circuit design-in.
SIM_CLK
All
38
O
SIM clock
3.25 MHz clock output for 1.8 V / 3 V SIM
See section 1.81.8 for functional description.
See section 2.42.4 for external circuit design-in.
SIM_RST
All
40
O
SIM reset
Reset output for 1.8 V / 3 V SIM
See section 1.81.8 for functional description.
See section 2.42.4 for external circuit design-in.
SIM_DET
All
42
I
SIM detection
1.8 V input for SIM presence detection function.
See section 1.8.2 for functional description.
See section 2.4 for external circuit design-in.

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Function
Pin Name
Module
Pin No
I/O
Description
Remarks
UART
RXD
All
13
O
UART data
output
1.8 V output, Circuit 104 (RXD) in ITU-T
V.24,
for AT command, data communication, FOAT.
See section 1.9.11.9.1 for functional description.
See section 2.5.12.5.1 for external circuit design-
in.
TXD
All
12
I
UART data input
1.8 V input, Circuit 103 (TXD) in ITU-T V.24,
for AT command, data communication, FOAT.
Internal active pull-up to V_INT.
See section 1.9.11.9.1 for functional description.
See section 2.5.12.5.1 for external circuit design-
in.
CTS
All
11
O
UART clear to
send output
1.8 V output, Circuit 106 (CTS) in ITU-T
V.24,
for AT command, Data communication, FOAT.
See section 1.9.11.9.1 for functional description.
See section 2.5.12.5.1 for external circuit design-
in.
RTS
All
10
I
UART ready to
send input
1.8 V input, Circuit 105 (RTS) in ITU-T V.24,
for AT command, data communication, FOAT.
Internal active pull-up to V_INT.
See section 1.9.11.9.1 for functional description.
See section 2.5.12.5.1 for external circuit design-
in.
DSR
All
6
O
UART data set
ready output
1.8 V output, Circuit 107 (DSR) in ITU-T
V.24,
for AT command, data communication, FOAT.
See section 1.9.11.9.1 for functional description.
See section 2.5.12.5.1 for external circuit design-
in.
RI
All
7
O
UART ring
indicator output
1.8 V output, Circuit 125 (RI) in ITU-T V.24,
for AT command, data communication, FOAT.
See section 1.9.11.9.1 for functional description.
See section 2.5.12.5.1 for external circuit design-
in.
DTR
All
9
I
UART data
terminal ready
input
1.8 V input, Circuit 108/2 (DTR) in ITU-T
V.24,
for AT command, data communication, FOAT.
Internal active pull-up to V_INT.
See section 1.9.11.9.1 for functional description.
See section 2.5.12.5.1 for external circuit design-
in.
DCD
All
8
O
UART data
carrier detect
output
1.8 V input, Circuit 109 (DCD) in ITU-T V.24,
for AT command, data communication, FOAT.
See section 1.9.11.9.1 for functional description.
See section 2.5.12.5.1 for external circuit design-
in.

SARA-G3 series - System Integration Manual
UBX-13000995 - R06 Objective Specification System description
Page 20 of 218
Function
Pin Name
Module
Pin No
I/O
Description
Remarks
Auxiliary
UART
RXD_AUX
All
28
O
Auxiliary UART
data output
1.8 V output, Circuit 104 (RXD) in ITU-T
V.24,
for FW upgrade and trace log capture.
Access by external test-point is recommended.
See section 1.9.21.9.2 for functional description.
See section 2.5.22.5.2 for external circuit
design-in.
TXD_AUX
All
29
I
Auxiliary UART
data input
1.8 V input, Circuit 103 (TXD) in ITU-T V.24,
for FW upgrade and trace log capture.
Access by external test-point is recommended.
Internal active pull-up to V_INT.
See section 1.9.21.9.2 for functional description.
See section 2.5.22.5.2 for external circuit
design-in.
DDC
SCL
SARA-G350
27
O
I2C bus clock
line
1.8 V open drain, for the communication with
u-blox positioning modules and chips.
External pull-up required.
See section 1.9.31.9.3 for functional description.
See section 2.5.32.5.3 for external circuit
design-in.
SDA
SARA-G350
26
I/O
I2C bus data line
1.8 V open drain, for the communication with
u-blox positioning modules and chips.
External pull-up required.
See section 1.9.31.9.3 for functional description.
See section 2.5.32.5.3 for external circuit
design-in.