Telit Wireless Solutions SL871, SL871L, SL871-S, SL871L-S Product User Manual
SL871 Family
Product User Guide
1VV0301170 Rev. 6
2018-03-13
SL871 Family Product User Guide NOTICES
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
NOTICES
While reasonable efforts have been made to ensure the accuracy of this document, Telit
assumes no liability resulting from any inaccuracies or omissions in this document, or from use
of the information obtained herein. The information in this document has been carefully checked
and is believed to be reliable, however no responsibility is assumed for inaccuracies or
omissions. Telit reserves the right to make changes to any products described herein and
reserves the right to revise this document and to make changes from time to time in content
hereof with no obligation to notify any person of revisions or changes. Telit does not assume
any liability arising out of the application or use of any product, software, or circuit described
herein; neither does it convey license under its patent rights or the rights of others.
It is possible that this publication may contain references to, or information about Telit products
(machines and programs), programming, or services that are not announced in your country.
Such references or information must not be construed to mean that Telit intends to announce
such Telit products, programming, or services in your country.
COPYRIGHTS
This manual and the Telit products described herein may be, include or describe copyrighted
Telit material, such as computer programs stored in semiconductor memories or other media.
Laws in Italy and other countries preserve for Telit and its licensors certain exclusive rights for
copyrighted material, including the exclusive right to copy, reproduce in any form, distribute and
make derivative works of the copyrighted material. Accordingly, any copyrighted material of Telit
and its licensors contained herein or in the Telit products described in this manual may not be
copied, reproduced, distributed, merged or modified in any manner without the express written
permission of Telit. Furthermore, the purchase of Telit products shall not be deemed to grant
either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents
or patent applications of Telit, as arises by operation of law in the sale of a product.
COMPUTER SOFTWARE COPYRIGHTS
The Telit and Third Party supplied Software (SW) products described in this manual may
include copyrighted Telit and other Third Party supplied computer programs stored in
semiconductor memories or other media. Laws in Italy and other countries preserve for Telit and
other Third Party supplied SW certain exclusive rights for copyrighted computer programs,
including the exclusive right to copy or reproduce in any form the copyrighted computer
program. Accordingly, any copyrighted Telit or other Third Party supplied SW computer
programs contained in the Telit products described in this manual may not be copied (reverse
engineered) or reproduced in any manner without the express written permission of Telit or the
Third Party SW supplier. Furthermore, the purchase of Telit products shall not be deemed to
grant either directly or by implication, estoppel, or otherwise, any license under the copyrights,
patents or patent applications of Telit or other Third Party supplied SW, except for the normal
non-exclusive, royalty-free license to use that arises by operation of law in the sale of a product.
1VV0301170 Rev. 6 Page 2 of 85 2018-03-13
SL871 Family Product User Guide NOTICES
USAGE AND DISCLOSURE RESTRICTIONS
I. License Agreements
The software described in this document is the property of Telit and its licensors. It is furnished
by express license agreement only and may be used only in accordance with the terms of such
an agreement.
II. Copyrighted Materials
Software and documentation are copyrighted materials. Making unauthorized copies is
prohibited by law. No part of the software or documentation may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any language or computer language,
in any form or by any means, without prior written permission of Telit
III. High Risk Materials
Components, units, or third-party products used in the product described herein are NOT faulttolerant and are NOT designed, manufactured, or intended for use as on-line control equipment
in the following hazardous environments requiring fail-safe controls: the operation of Nuclear
Facilities, Aircraft Navigation or Aircraft Communication Systems, Air Traffic Control, Life
Support, or Weapons Systems (High Risk Activities"). Telit and its supplier(s) specifically
disclaim any expressed or implied warranty of fitness for such High Risk Activities.
IV. Trademarks
TELIT and the Stylized T Logo are registered in the Trademark Office. All other product or
service names are the property of their respective owners.
V. Third Party Rights
The software may include Third Party Right software. In this case you agree to comply with all
terms and conditions imposed on you in respect of such separate software. In addition to Third
Party Terms, the disclaimer of warranty and limitation of liability provisions in this License shall
apply to the Third Party Right software.
TELIT HEREBY DISCLAIMS ANY AND ALL WARRANTIES EXPRESS OR IMPLIED FROM
ANY THIRD PARTIES REGARDING ANY SEPARATE FILES, ANY THIRD PARTY
MATERIALS INCLUDED IN THE SOFTWARE, ANY THIRD PARTY MATERIALS FROM
WHICH THE SOFTWARE IS DERIVED (COLLECTIVELY “OTHER CODE”), AND THE USE OF
ANY OR ALL THE OTHER CODE IN CONNECTION WITH THE SOFTWARE, INCLUDING
(WITHOUT LIMITATION) ANY WARRANTIES OF SATISFACTORY QUALITY OR FITNESS
FOR A PARTICULAR PURPOSE.
NO THIRD PARTY LICENSORS OF OTHER CODE SHALL HAVE ANY LIABILITY FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
WHETHER MADE UNDER CONTRACT, TORT OR OTHER LEGAL THEORY, ARISING IN
ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE OTHER CODE OR THE
EXERCISE OF ANY RIGHTS GRANTED UNDER EITHER OR BOTH THIS LICENSE AND
THE LEGAL TERMS APPLICABLE TO ANY SEPARATE FILES, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
1VV0301170 Rev. 6 Page 3 of 85 2018-03-13
SL871 Family Product User Guide NOTICES
PRODUCT
SL871
SL871L
SL871-S
SL871L-S
PRODUCT APPLICABILITY TABLE
Table 0-1 Product Applicability Table
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SL871 Family Product User Guide CONTENTS
CONTENTS
NOTICES .................................................................................................................................... 2
COPYRIGHTS ............................................................................................................................ 2
COMPUTER SOFTWARE COPYRIGHTS .................................................................................. 2
USAGE AND DISCLOSURE RESTRICTIONS ........................................................................... 3
PRODUCT APPLICABILITY TABLE .......................................................................................... 4
CONTENTS ................................................................................................................................ 5
TABLES ..................................................................................................................................... 9
FIGURES .................................................................................................................................. 10
1 INTRODUCTION ........................................................................................................... 11
Purpose .................................................................................................................... 11
Contact and Support Information ............................................................................... 11
Text Conventions ...................................................................................................... 11
Related Publications and Downloads ........................................................................ 12
Related Documents and downloads ........................................................................ 12
Related Documents Requiring a Non-Disclosure Agreement .................................. 12
2 PRODUCT DESCRIPTION ........................................................................................... 13
Product Overview ...................................................................................................... 13
Product Naming ........................................................................................................ 14
Product Variants ....................................................................................................... 14
SL871-S and SL871L-S Features ........................................................................... 14
SL871 Product Features Table ............................................................................... 15
Block Diagrams ......................................................................................................... 16
SL871 (Gen 2) Block Diagram ................................................................................ 16
SL871L Block Diagram ........................................................................................... 17
SL871-S Block Diagram .......................................................................................... 18
SL871L-S Block Diagram ........................................................................................ 19
Module Photo ............................................................................................................ 20
3 EVALUATION KIT ........................................................................................................ 21
Evaluation Unit .......................................................................................................... 22
4 PRODUCT FEATURES ................................................................................................ 23
Multi-Constellation Navigation (SL871 and SL871L only) ......................................... 23
Quasi-Zenith Satellite System (QZSS) ...................................................................... 23
Satellite-Based Augmentation System (SBAS) .......................................................... 23
SBAS Corrections ................................................................................................... 23
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SL871 Family Product User Guide CONTENTS
SBAS Ranging ........................................................................................................ 23
Differential GPS (DGPS) (SL871 and SL871L only) ................................................. 23
Assisted GPS (AGPS) ............................................................................................... 24
Locally-generated AGPS - Embedded Assist System (EASY) ................................ 24
Server-generated AGPS - Extended Prediction Orbit (EPO) ................................... 24
Host EPO ................................................................................................................ 24
10 Hz Navigation ....................................................................................................... 24
Elevation Mask Angle ................................................................................................ 24
Static Navigation ....................................................................................................... 25
Jamming Rejection – Active Interference Cancellation (AIC) ..................................... 25
Internal LNA (SL871L and SL871L-S only).............................................................. 26
1PPS......................................................................................................................... 26
Power Management Modes ...................................................................................... 27
Full Power Continuous Mode .................................................................................. 27
Backup Mode (Perpetual) (SL871 and SL871L only) ............................................. 28
Standby Modes ....................................................................................................... 28
GLP Mode (SL871 and SL871L modules only) ...................................................... 28
Periodic Modes (SL871 and LS871L only) ............................................................. 29
AlwaysLocate™ Modes .......................................................................................... 30
5 DATA RETENTION ....................................................................................................... 31
6 PRODUCT PERFORMANCE ........................................................................................ 32
Performance - SL871 and SL871L ............................................................................ 32
Horizontal Position Accuracy - SL871 and SL871L ................................................. 32
Time to First Fix - SL871 and SL871L ..................................................................... 33
Sensitivity - SL871 (Gen 2) and SL871L ................................................................. 34
Performance - SL871-S and SL871L-S ..................................................................... 35
Position Accuracy - SL871-S and SL871L-S ........................................................... 35
Time to First Fix - SL871-S and SL871L-S .............................................................. 35
Sensitivity - SL871-S and SL871L-S ....................................................................... 35
Jamming Mitigation Performance example ................................................................ 36
7 SOFTWARE INTERFACE ............................................................................................. 37
NMEA Output Messages ........................................................................................... 37
Standard Messages ................................................................................................ 37
Proprietary Output Messages ................................................................................. 38
NMEA Input Commands............................................................................................ 39
NMEA Commands List ............................................................................................ 39
8 FLASH UPGRADABILITY ............................................................................................ 40
9 ELECTRICAL INTERFACE .......................................................................................... 41
Pinout diagrams and tables ....................................................................................... 41
SL871 (Gen 2) and SL871L Pin-out diagram and table ........................................... 41
SL871-S and SL871L-S Pin-out diagram and table ................................................. 43
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SL871 Family Product User Guide CONTENTS
DC Power Supply ...................................................................................................... 45
VCC ........................................................................................................................ 45
VBATT .................................................................................................................... 45
VCC_RF ................................................................................................................. 45
DC Power Requirements ........................................................................................ 46
DC Power Consumption - SL871 (Gen 2) ............................................................... 46
DC Power Consumption – SL871L ......................................................................... 47
DC Power Consumption - SL871-S ......................................................................... 48
DC Power Consumption - SL871L-S ....................................................................... 48
Digital Interface Signals ............................................................................................ 49
I/O Signal Levels ..................................................................................................... 49
Antenna Related Signals ........................................................................................ 51
Control (Input) Signals ............................................................................................ 52
Output (Status) Signals ........................................................................................... 52
Serial I/O Ports .......................................................................................................... 53
Serial Port Usage .................................................................................................... 53
UART Port Operation .............................................................................................. 53
I2C Port Operation (SL871 and SL871L only) ......................................................... 54
Antenna RF Interface ................................................................................................ 55
RF-IN ...................................................................................................................... 55
Frequency Plan ....................................................................................................... 55
Burnout Protection .................................................................................................. 55
Jamming Rejection – Active Interference Cancellation ............................................ 55
10 RF FRONT-END DESIGN ............................................................................................. 56
RF Signal Requirements ........................................................................................... 56
GNSS Antenna Polarization ...................................................................................... 57
Active versus Passive Antenna ................................................................................. 57
GNSS Antenna Gain ................................................................................................. 58
System Noise Floor ................................................................................................... 58
RF Trace Losses ....................................................................................................... 59
PCB Stack and Trace Impedance ............................................................................. 59
Input to the Pre-select SAW Filter (SL8721 Gen 2 and SL871-S only) ...................... 60
Input to the LNA (SL871L AND SL871L-S only) ........................................................ 60
Powering an External LNA (or active antenna) .......................................................... 60
RF Interference ......................................................................................................... 61
Shielding ................................................................................................................... 61
11 REFERENCE DESIGN .................................................................................................. 62
12 MECHANICAL DRAWING ............................................................................................ 63
13 PCB FOOTPRINT ......................................................................................................... 64
14 PACKAGING & HANDLING ......................................................................................... 65
Product Marking and Serialization ............................................................................. 65
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SL871 Family Product User Guide CONTENTS
Product Packaging .................................................................................................... 66
Moisture Sensitivity ................................................................................................... 68
ESD Sensitivity ......................................................................................................... 70
Assembly Considerations .......................................................................................... 70
Washing Considerations ........................................................................................... 70
Reflow ....................................................................................................................... 71
Disposal .................................................................................................................... 72
Safety........................................................................................................................ 72
15 ENVIRONMENTAL REQUIREMENTS .......................................................................... 73
Operating Environmental Limits ................................................................................ 73
Storage Environmental Limits ................................................................................... 73
16 COMPLIANCES ............................................................................................................ 74
RoHS compliance ..................................................................................................... 74
EU (RED) Declarations of Conformity ....................................................................... 75
EU (RED) Declaration of Conformity – SL871 ......................................................... 75
EU (RED) Declaration of Conformity – SL871L ....................................................... 76
EU RED Declaration of Conformity – SL871-S ........................................................ 77
EU RED Declaration of Conformity – SL871L-S ...................................................... 78
17 SAFETY RECOMMENDATIONS .................................................................................. 79
18 GLOSSARY AND ACRONYMS .................................................................................... 80
19 DOCUMENT HISTORY ................................................................................................. 83
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SL871 Family Product User Guide CONTENTS
TABLES
Table 0-1 Product Applicability Table ........................................................................................ 4
Table 2-1 SL871 Family Product Features ................................................................................15
Table 2-2 ROM Features (-S modules only) .............................................................................15
Table 4-1 Power Management - Command summary ...............................................................27
Table 5-1 Data Retention ..........................................................................................................31
Table 6-1 SL871 and SL871L Horizontal Position Accuracy......................................................32
Table 6-2 SL871 and SL871L Time to First Fix .........................................................................33
Table 6-3 SL871 (Gen 2) and SL871L Receiver Sensitivity .......................................................34
Table 6-4 SL871-S and SL871L-S Position Accuracy ...............................................................35
Table 6-5 SL871-S and SL871L-S Time to First Fix ..................................................................35
Table 6-6 SL871-S and SL871L-S Sensitivity ...........................................................................35
Table 7-1 Default NMEA output messages ...............................................................................37
Table 7-2 Available Messages ..................................................................................................37
Table 7-3 NMEA Talker IDs ......................................................................................................38
Table 7-4 Proprietary Output Messages ....................................................................................38
Table 7-5 NMEA Input Commands............................................................................................39
Table 9-1 SL871 (Gen 2) & SL871L Pin-out Table ....................................................................42
Table 9-2 SL871-S & SL871L-S Pin-out Table ..........................................................................44
Table 9-3 DC Supply Voltage ....................................................................................................46
Table 9-4 SL871 (Gen 2) Power Consumption ..........................................................................46
Table 9-5 SL871L Power Consumption .....................................................................................47
Table 9-6 SL871-S Power Consumption ...................................................................................48
Table 9-7 SL871L-S Power Consumption .................................................................................48
Table 9-8 Input Logic Levels: RX and Reset-N, & Ant Sense ....................................................49
Table 9-9 Input Logic Levels: Force-On ....................................................................................49
Table 9-10 Output Logic Levels: TX and 1PPS .........................................................................50
Table 9-11 Output Logic Levels: ANT_ON ................................................................................50
Table 9-12 Frequency Plan .......................................................................................................55
Table 10-1 Inductor Loss ..........................................................................................................61
Table 14-1 Product Label Description .......................................................................................65
Table 15-1 Operating Environmental Limits ..............................................................................73
Table 15-2 Storage Environmental Limits ..................................................................................73
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SL871 Family Product User Guide CONTENTS
FIGURES
Figure 2-1 SL871 (Gen 2) Block Diagram .................................................................................16
Figure 2-2 SL871L Block Diagram ............................................................................................17
Figure 2-3 SL871-S - Block Diagram .........................................................................................18
Figure 2-4 SL871L-S - Block Diagram .......................................................................................19
Figure 2-5 SL871 Family Module – Photo ................................................................................20
Figure 3-1 Evaluation Kit contents ............................................................................................21
Figure 3-2 SL871 Evaluation Unit.............................................................................................22
Figure 4-1Jamming Rejection ...................................................................................................25
Figure 4-2 GNSS Low Power (GLP) mode diagram ..................................................................28
Figure 4-3 Periodic Modes diagram ..........................................................................................29
Figure 4-4 Periodic Mode example 1 .........................................................................................29
Figure 4-5 Periodic Mode example 2 .........................................................................................29
Figure 6-1 Jamming with AIC Disabled .....................................................................................36
Figure 6-2 Jamming with AIC Enabled ......................................................................................36
Figure 9-1 SL871 (Gen 2) and SL871L Pin-out diagram ...........................................................41
Figure 9-2 SL871-S and SL871L-S Pin-out diagram .................................................................43
Figure 10-1 RF Trace Examples ...............................................................................................59
Figure 11-1 SL871 Family Reference Design ............................................................................62
Figure 12-1 SL871 Family Mechanical Drawing .......................................................................63
Figure 13-1 SL871 Family PCB Footprint .................................................................................64
Figure 14-1 Product Label ........................................................................................................65
Figure 14-2 Tape and Reel Packaging ......................................................................................66
Figure 14-3 Tape and Reel Detail .............................................................................................67
Figure 14-4 Moisture Sensitive Devices Label...........................................................................69
Figure 14-5 Recommended Reflow Profile ...............................................................................71
Figure 16-1 EU RED Declaration of Conformity - SL871 ...........................................................75
Figure 16-2 EU RED Declaration of Conformity - SL871L .........................................................76
Figure 16-3 EU RED Declaration of Conformity - SL871-S .......................................................77
Figure 16-4 EU RED Declaration of Conformity - SL871L-S......................................................78
EQUATIONS
Equation 10-1 Carrier to Noise Ratio .........................................................................................58
1VV0301170 Rev. 6 Page 10 of 85 2018-03-13
SL871 Family Product User Guide INTRODUCTION
Symbol
Description
Danger – This information MUST be followed or catastrophic equipment failure
and/or bodily injury may occur.
Caution or Warning – This is an important point about integrating the product into a
fail.
1 INTRODUCTION
Purpose
The purpose of this document is to provide information regarding the function, features, and
usage of the Telit products listed in Table 0-1 Product Applicability Table
Please refer to Section 2 PRODUCT DESCRIPTION for details of product features and product
variants.
Contact and Support Information
For general contact, technical support services, technical questions, and to report
documentation errors contact Telit Technical Support at:
• TS-EMEA@telit.com
• TS-AMERICAS@telit.com
• TS-APAC@telit.com
Alternatively, use:
• http://www.telit.com/support
For detailed information about where you can buy the Telit modules or for recommendations on
accessories and components visit:
• http://www.telit.com
Our aim is to make this guide as helpful as possible. Keep us informed of your comments and
suggestions for improvements.
Telit appreciates feedback from the users of our information.
Text Conventions
Dates are in ISO 8601 format, i.e. YYYY-MM-DD.
system. If this information is disregarded, the product or system may malfunction or
Tip – This is advice or suggestion that may be useful when integrating the product.
1VV0301170 Rev. 6 Page 11 of 85 2018-03-13
SL871 Family Product User Guide INTRODUCTION
Related Publications and Downloads
Please see http://www.telit.com/gnss/ for current documentation and downloads
Related Documents and downloads
• Datasheets
• Product User Guides
• EVK User Guides
• Software User Guides
• Application Notes
• TelitView installation and documentation
Related Documents Requiring a Non-Disclosure Agreement
• Authorized Software User Guides
• Product firmware
1VV0301170 Rev. 6 Page 12 of 85 2018-03-13
SL871 Family Product User Guide PRODUCT DESCRIPTION
2 PRODUCT DESCRIPTION
The SL871 family of GNSS receiver modules provides complete position, velocity, and time
(PVT) engines featuring high performance, high sensitivity, and low power consumption.
All modules compute a navigation solution using GPS signals. Multi-constellation modules add
GLONASS, BeiDou, and Galileo signals to yield better coverage, greater accuracy, and
improved availability.
Multi-constellation (MT3333): SL871 and SL871L
GPS only (MT3337E): SL871-S and SL871L-S
Product Overview
• Complete GNSS receiver modules including memory, TCXO, and RTC
• SL871L and SL871L-S modules also include a built-in LNA and DC blocking cap
• Constellations:
o SL871x: GPS (L1), QZSS, and either Glonass (L1) or BeiDou (B1)
simultaneous ranging. Galileo ready with 99 search and 33 tracking channels.
o SL871x-S: GPS (L1) and QZSS ranging with 66 search and 22 tracking
channels.
• SBAS capable (WAAS, EGNOS, MSAS, GAGAN) including ranging (SL871x only)
• DGPS capable using the RTCM SC-104 protocol
• AGPS support for extended ephemeris using local or server-based solutions:
o Local: Embedded Assist System (EASY)
o Server: Extended Prediction Orbit (EPO)
• Jamming Rejection: Active Interference Cancellation (AIC)
• Supports active or passive antenna
• NMEA command input and data output
• Configurable fix reporting - Default: 1Hz, Max: 10 Hz
• Two serial ports for input commands and output messages
• SL871L: Second serial port is I
2
C interface, configurable for UART via FW load
• 1PPS output
• Memory:
o SL871: 8 Megabit built-in flash.
o SL871-S: ROM
• 76 mW typical power consumption (Full Power, GPS + GLONASS)
• Power management modes for extended battery life
• Supported by evaluation kits
• -40°C to +85°C industrial temperature range
• 18-pad 10.1 x 9.7 x 2.4 mm Industry Standard LLC castellated edge package
• Surface mountable by standard SMT equipment
• RoHS compliant design
1
1
Note 1: See Table 2-1 SL871 Family Product Features for EASY and EPO support.
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SL871 Family Product User Guide PRODUCT DESCRIPTION
Product Naming
SL871: Product family name
L: Added LNA and DC blocking capacitor
S: GPS-only ROM-based receiver
Product Variants
The SL871 family includes the following variants:
• SL871 – Flash memory based, Multi-constellation
• SL871 (Gen 1): EOL in July 2015
• SL871 (Gen 2): Switching Mode Power Supply;
Added Antenna On, Antenna Sense, and Force On pins
• SL871L: Added an LNA and DC blocking capacitor
• SL871-S – ROM based, GPS-only
• SL871-S: Switching Mode Power Supply and Antenna On pin
• SL871 L-S: Added an LNA and DC blocking capacitor
SL871-S and SL871L-S Features
• GPS-only
• ROM-based (Firmware cannot be updated)
• The 2
• Locally generated AGPS (EASY - Embedded Assist System) on SL871-S and SL871L-S
• Server-generated AGPS (EPO - Extended Prediction Orbit) is supported via a host
2.3.1.1. ROM versions
The current SL871-S and SL871L-S have the MT3337E (enhanced) ROM with the following
changes -
Added features:
Deleted features:
nd
port is UART only (I2C is not supported)
is supported only on MT3337E ROM (version 2.3) after Oct. 2015.
Earlier ROM versions did not support EASY.
system for the SL871-S and SL871L-S.
Please refer to the MT333x Host EPO Application Note
• Improved TTFF and Position,
• EASY
• PPS sync with NMEA
• SBAS
• Always Locate
• LOCUS
1VV0301170 Rev. 6 Page 14 of 85 2018-03-13
SL871 Family Product User Guide PRODUCT DESCRIPTION
SL871-S
Production)
GPS
Galileo
GPS
Memory
Flash
ROM
Power Supply
Switching
Switching
Internal LNA
No
Yes
No
No
Yes
DC blocking cap
No
Yes
No
No
Yes
2nd Port
Yes (UART / I2C)
Yes (UART only)
Antenna Sense
Yes
No
Antenna On
Yes
Yes
Force On
Yes
No
Software
Upgradable
Yes
No
EPO
Yes
Yes (host)
ROM version
3337
3337E (enhanced)
EASY
No
Yes
SBAS
Yes
No
AlwaysLocate
Yes
No
LOCUS
Yes
No
SL871 Product Features Table
Feature SL871 SL871L
Constellations
Supported
QZSS
Glonass
BeiDou
(Early
SL871-S SL871L-S
QZSS
Table 2-1 SL871 Family Product Features
Feature
SL871-S
(early production)
Table 2-2 ROM Features (-S modules only)
SL871L-S
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SL871 Family Product User Guide PRODUCT DESCRIPTION
Block Diagrams
SL871 (Gen 2) Block Diagram
Figure 2-1 SL871 (Gen 2) Block Diagram
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SL871 Family Product User Guide PRODUCT DESCRIPTION
SL871L Block Diagram
Figure 2-2 SL871L Block Diagram
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SL871 Family Product User Guide PRODUCT DESCRIPTION
SL871-S Block Diagram
Figure 2-3 SL871-S - Block Diagram
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SL871 Family Product User Guide PRODUCT DESCRIPTION
SL871L-S Block Diagram
Figure 2-4 SL871L-S - Block Diagram
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SL871 Family Product User Guide PRODUCT DESCRIPTION
Module Photo
Figure 2-5 SL871 Family Module – Photo
Note: All variants have similar appearance (except for the product name).
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SL871 Family Product User Guide EVALUATION KIT
3 EVALUATION KIT
Please refer to the product Evaluation Kit User Guide for detailed information.
Figure 3-1 Evaluation Kit contents
Note: The SL871 kit includes a GPS / GLONASS / BeiDou antenna.
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SL871 Family Product User Guide EVALUATION KIT
Evaluation Unit
Figure 3-2 SL871 Evaluation Unit
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SL871 Family Product User Guide PRODUCT FEATURES
4 PRODUCT FEATURES
Multi-Constellation Navigation (SL871 and SL871L only)
GPS and GLONASS constellations are enabled by default.
The user may enable or disable constellations via the $PMTK353 command
The SL871-S and SL871L–S support GPS only.
Quasi-Zenith Satellite System (QZSS)
The satellites of the Japanese regional SBAS are in a highly inclined, elliptical geosynchronous
orbit, allowing continuous high-elevation coverage over Japan using only three satellites plus
one geostationary satellite. They provide ranging signals, but also may be used for
augmentation of the GPS system.
QZSS constellation usage is controlled by the $PMTK352 command and is disabled by default.
NMEA reporting for QZSS may be enabled/disabled by the $PMTK351 command.
Satellite-Based Augmentation System (SBAS)
SBAS is not supported on the current production SL871-S modules (with the enhanced ROM).
The receiver is capable of using SBAS satellites as a source of both differential corrections and
satellite ranging measurements. These systems (WAAS, EGNOS, GAGAN and MSAS) use
geostationary satellites to transmit signals similar to those of GPS in the same L1 band.
Enabling the SBAS feature limits the maximum fix rate to 5 Hz. If disabled, the maximum is 10
Hz (except for SL871-S modules).
The module is enabled for SBAS by default, but can be disabled by command $PTMK313.
Either SBAS or DGPS corrections can be used and are set by the $PMTK301 command.
SBAS Corrections
The SBAS satellites transmit a set of differential corrections to their respective regions. The use
of SBAS corrections can improve positioning accuracy.
SBAS Ranging
The use of SBAS satellites can augment the number of measurements available for the
navigation solution, thus improving availability and accuracy.
Differential GPS (DGPS) (SL871 and SL871L only)
DGPS is a Ground-Based Augmentation System (GBAS) for reducing position errors by
applying corrections from a set of accurately-surveyed ground stations located over a wide
area. These reference stations measure the range to each satellite and compare it to the
known-good range. The differences can then be used to compute a set of corrections which are
transmitted either by radio to a DGPS receiver or over the internet.
The DGPS receiver can then send them to serial port 2 (RX1) using the RTCM SC-104 protocol
message types 1, 2, 3, and 9.
These corrections can significantly improve the accuracy of the position reported to the user.
The receiver can accept either the RTCM SC-104 messages or SBAS differential data via
command $PMTK501. .
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SL871 Family Product User Guide PRODUCT FEATURES
Assisted GPS (AGPS)
Assisted GPS (or Aided GPS) is a method by which information from a source other than
broadcast GPS signals is used to improve (i.e. reduce) TTFF.
The necessary ephemeris data is calculated either by the receiver itself (locally-generated
ephemeris), or a server (server-generated ephemeris) and is then stored in the module.
See Section 2.3 Product Variants for applicability.
Locally-generated AGPS - Embedded Assist System (EASY)
This feature is not supported on the SL871-S until ROM MT3337E version (enhanced) of Oct
2015. It is supported on the SL871L-S.
Proprietary algorithms within the module perform GPS ephemeris prediction locally from stored
broadcast ephemeris data (received from tracked satellites). The algorithms predict orbital
parameters for up to three days. The module must operate in Full Power mode for at least 5
minutes to collect ephemeris data from visible satellites, or 12 hours for the full constellation.
EASY is disabled if the fix rate is > 1 Hz
EASY is on by default, but can be disabled by command PMTK869.
Server-generated AGPS - Extended Prediction Orbit (EPO)
(SL871 and SL871L only)
Server-generated ephemeris predictions are maintained on Telit AGPS servers. The predicted
ephemeris file is obtained from the AGPS server and is transmitted to the module over serial
port 1 (RX). These predictions do not require local broadcast ephemeris collection, and are valid
for up to 14 days.
Note that the EPO data stream does not conform to the NMEA-0183 standard.
Please refer to the Telit EPO Application Note for details.
Example source code is available under NDA.
Contact TELIT for support regarding this service.
See the next section regarding EPO support (Host EPO) on the SL871-S and SL871L-S.
Host EPO
The SL871-S and SL871L-S do not have flash memory. However, they can still make use of
Assisted GPS. If the system design includes a host processor, it can access server-generated
EPO data and send it to the module over the primary serial port. This data is valid for six hours.
Host EPO data is not retained over a power cycle.
Note that the EPO data stream does not conform to the NMEA-0183 standard.
Please refer to the MT333x Host EPO Application Note.
Please contact Telit support for further details.
10 Hz Navigation
The default rate of 1 Hz can be changed by command $PMTK500 to a maximum of 10 Hz.
Enabling the SBAS feature limits the maximum fix rate to 5 Hz.
The SL871-S and SL871L-S maximum is 5 Hz.
Elevation Mask Angle
The default elevation mask angle is 5°. It can be changed via the PMTK311 command.
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SL871 Family Product User Guide PRODUCT FEATURES
Static Navigation
Static Navigation is an operating mode in which the receiver will freeze the position fix when the
speed falls below a set threshold (indicating that the receiver is stationary).
The course and altitude are also frozen, and the speed is reported as “0”.
The navigation solution is unfrozen when the speed increases above a threshold or when the
computed position exceeds a set distance (10 m) from the frozen position (indicating that the
receiver is again in motion). The speed threshold can be set via the command.
Set this threshold to zero to disable static navigation.
This feature is useful for applications in which very low dynamics are not expected, the classic
example being an automotive application.
Static Navigation is disabled by default, but can be enabled by command $PMTK386.
Jamming Rejection – Active Interference Cancellation (AIC)
The receiver module detects and removes narrow-band interfering signals (jamming signals)
without the need for external components or tuning. It rejects up to 12 CW (Continuous Wave)
type signals of up to –80 dBm (total power signal levels). This feature is useful both in the
design stage and during the production stage for uncovering issues related to unexpected
jamming. When enabled, Jamming Rejection will increase current drain by about 1 mA, and
impact on GNSS performance is low at modest jamming levels. However, at high jamming
levels (e. g. –90 to –80 dBm), the RF signal sampling ADC starts to become saturated after
which the GNSS signal levels start to diminish.
Jamming rejection is enabled by default, but can be disabled with the PMTK286 command.
Figure 4-1Jamming Rejection
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SL871 Family Product User Guide PRODUCT FEATURES
Internal LNA (SL871L and SL871L-S only)
The SL871L and SL871L-S modules include a built-in LNA to improve sensitivity.
1PPS
The module provides a 1PPS output signal. See Section 9.3.4.1 1PPS for details.
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