Telit Wireless Solutions SL871 Specification sheet

SL871 Family
Product User Guide
1VV0301170 Rev. 9 –2021-07-15
Telit Technical Documentation

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 2of 89 2021-07-15
Not Subject to NDA
APPLICABILITY TABLE
PRODUCTS
SL871
SL871L
SL871-S
SL871L-S

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 3of 89 2021-07-15
Not Subject to NDA
CONTENTS
APPLICABILITY TABLE 2
CONTENTS 3
1. INTRODUCTION 8
Scope 8
Audience 8
Contact Information, Support 8
Symbol Conventions 9
Related Documents 9
Related Documents Requiring a Non-Disclosure Agreement 9
2. PRODUCT DESCRIPTION 10
Product Overview 10
Product Naming 11
Product Variants 11
SL871-S and SL871L-S Features 11
2.3.1.1. ROM versions 12
SL871 Product Features Table 12
Block Diagrams 13
SL871 (Gen 2) Block Diagram 13
SL871L Block Diagram 14
SL871-S Block Diagram 14
SL871L-S Block Diagram 15
Module Photo 16
3. EVALUATION KIT 17
Evaluation Unit 18
4. PRODUCT FEATURES 19
Multi-Constellation Navigation (SL871 and SL871L only) 19
Quasi-Zenith Satellite System (QZSS) 19
Satellite-Based Augmentation System (SBAS) 19
SBAS Corrections 19

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 4of 89 2021-07-15
Not Subject to NDA
Differential GPS (DGPS) (SL871 and SL871L only) 20
Assisted GPS (AGPS) 20
Locally generated AGPS - Embedded Assist System (EASY) 20
Server-generated AGPSS - Extended Prediction Orbit (EPO)20
Host EPO 21
10 Hz Navigation 21
Elevation Mask Angle 21
Static Navigation 21
Jamming Rejection –Active Interference Cancellation (AIC)22
Internal LNA (SL871L and SL871L-S only) 22
1PPS 23
Serial I/O Ports 23
Power Management Modes 23
Full Power Continuous Mode 24
Backup Mode (Perpetual) (SL871 and SL871L only) 24
Standby Modes 25
GLP Mode (SL871 and SL871L modules only) 25
Periodic Modes (SL871 and LS871L only) 26
AlwaysLocate™ Modes 28
5. DATA RETENTION 29
6. PRODUCT PERFORMANCE 30
Performance - SL871 and SL871L 30
Horizontal Position Accuracy - SL871 and SL871L 30
Time to First Fix - SL871 and SL871L 30
Sensitivity - SL871 (Gen 2) and SL871L 31
Performance - SL871-S and SL871L-S 31
Position Accuracy - SL871-S and SL871L-S 31
Time to First Fix - SL871-S and SL871L-S 32
Sensitivity - SL871-S and SL871L-S 32
Jamming Mitigation Performance Example 33
7. MESSAGE INTERFACE 34

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 5of 89 2021-07-15
Not Subject to NDA
NMEA Output Messages 34
Standard Messages 34
Proprietary Output Messages 35
NMEA Input Commands 35
NMEA Commands List 36
8. FLASH UPGRADABLITY 37
9. ELECTRICAL INTERFACE 38
Pinout Diagrams and Tables 38
SL871 (Gen 2) and SL871L Pin-out Diagram and Table 38
SL871-S and SL871L-S Pin-out Diagram and Table 40
DC Power Supply 42
VCC 42
VBATT 42
VCC_RF 43
DC Power Requirements 43
DC Power Consumption - SL871 (Gen 2) 43
DC Power Consumption –SL871L 44
DC Power Consumption - SL871-S 44
DC Power Consumption - SL871L-S 45
Digital Interface Signals 45
I/O Signal Levels 45
9.3.1.1. Logic Levels - Inputs 45
9.3.1.2. Logic Levels - Outputs 46
Antenna Related Signals 46
9.3.2.1. VCC-RF (Active Antenna Supply Voltage) (SL871 and SL871-S only) ..............46
9.3.2.2. ANT-ON (output) 47
9.3.2.3. ANT-OC (SL871 and SL871L only) 47
9.3.2.4. ANT-SC-N (SL871 and SL871L only) 47
Control (Input) Signals 47
9.3.3.1. RESET-N 47
9.3.3.2. FORCE-ON (SL871 and SL871L only). 48
Output Signals 48

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 6of 89 2021-07-15
Not Subject to NDA
9.3.4.1. 1PPS 48
Serial I/O Ports 49
Serial Port Usage 49
9.4.1.1. Primary (Port 0) Usage 49
9.4.1.2. Secondary Port Usage 49
UART Port Operation 50
I2C Port Operation (SL871 and SL871L only) 50
Antenna RF Interface 52
RF-IN 52
Frequency Plan 52
Burnout Protection 52
Jamming Rejection –Active Interference Cancellation 53
10. RF FRONT-END DESIGN 54
RF Signal Requirements 54
GNSS Antenna Polarization 56
Active versus Passive Antenna 56
GNSS Antenna Gain 56
System Noise Floor 57
RF Trace Losses 58
PCB Stack and Trace Impedance 58
Input to the Pre-select SAW Filter (SL8721 Gen 2 and SL871-S only) 59
Input to the LNA (SL871L AND SL871L-S only) 59
Powering an External LNA (or active antenna) 59
RF Interference 60
Shielding 61
11. REFERENCE DESIGN 62
12. MECHANICAL DRAWING 64
13. PCB FOOTPRINT 65
14. PACKAGING & HANDLING 66
Product Marking and Serialization 66
Product Packaging 67

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 7of 89 2021-07-15
Not Subject to NDA
Moisture Sensitivity 68
ESD Sensitivity 69
Assembly Considerations 70
Washing Considerations 70
Reflow 70
Disposal 72
Safety 72
15. ENVIRONMENTAL REQUIREMENTS 73
Operating Environmental Limits 73
Storage Environmental Limits 73
16. COMPLIANCES 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. PRODUCT AND SAFETY INFORMATION 79
Copyrights and Other Notices 79
Copyrights 79
Computer Software Copyrights 79
Usage and Disclosure Restrictions 80
License Agreements 80
Copyrighted Materials 80
High Risk Materials 80
Trademarks 81
Third Party Rights 81
Waiver of Liability 81
Safety Recommendations 82
18. GLOSSARY 83
19. DOCUMENT HISTORY 87

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 8of 89 2021-07-15
Not Subject to NDA
1. INTRODUCTION
Scope
The purpose of this document is to provide information regarding the function, features,
and usage of the Telit products listed in Applicability Table.
Please refer to chapter 2. Product Description for details of product features and product
variants.
Audience
This document is intended for Telit customers, especially system integrators, about to
implement their applications using the Telit SL871 family.
Contact Information, Support
For general contact, technical support services, technical questions and report of
documentation errors contact Telit Technical Support at:
• TS[email protected]
• TS[email protected]
• TS[email protected]
• TS[email protected]
• TS[email protected]
Alternatively, use:
https://www.telit.com/contact-us
For detailed information about where you can buy the Telit modules or for
recommendations on accessories and components visit:
https://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 the user feedback on our information.

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 9of 89 2021-07-15
Not Subject to NDA
Symbol Conventions
Danger: This information MUST be followed or catastrophic
equipment failure or personal injury may occur.
Warning: Alerts the user on important steps about the module
integration.
Note/Tip: Provides advice and suggestions that may be useful when
integrating the module.
Electro-static Discharge: Notifies the user to take proper grounding
precautions before handling the product.
Table 1: Symbol Conventions
All dates are in ISO 8601 format, that is YYYY-MM-DD.
Related Documents
•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

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 10 of 89 2021-07-15
Not Subject to NDA
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-based): SL871 and SL871L
GPS only (MT3337E-based): 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:
oSL871x: GPS (L1), QZSS, and either Glonass (L1) or BeiDou (B1)
simultaneous ranging with 99 search and 33 tracking channels. Galileo
ready.
oSL871x-S: GPS (L1) and QZSS ranging with 66 search and 22 tracking
channels.
•SBAS corrections capable (WAAS, EGNOS, MSAS, GAGAN) (SL871x only)
•DGPS capable using the RTCM SC-104 protocol
•AGPS support for extended ephemeris using local or server-based solutions:
oLocal: Embedded Assist System (EASY) 1
oServer: Extended Prediction Orbit (EPO) 1
•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
oSL871L: Second serial port is I2C interface, configurable for UART via
command
•1PPS output
•Memory:

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 11 of 89 2021-07-15
Not Subject to NDA
oSL871: 8 Megabit built-in flash.
oSL871-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
Note 1: See Table 2: SL871 Family Product Features for EASY and EPO support.
Product Naming
SL871: Product family name
S: GPS-only ROM-based receiver
L: Added LNA and DC blocking capacitor
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)

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 12 of 89 2021-07-15
Not Subject to NDA
•The 2nd port is UART only (I2C is not supported)
•Locally generated AGPS (EASY - Embedded Assist System) on SL871-S and
SL871L-S is supported only on MT3337E ROM (version 2.3) after Oct. 2015.
•Earlier ROM versions did not support EASY.
•Server-generated AGPS (EPO - Extended Prediction Orbit) is supported via a host
system for the SL871-S and SL871L-S.
Please refer to the MT333x Host EPO Application Note.
2.3.1.1. ROM versions
The current SL871-S and SL871L-S have the MT3337E (enhanced) ROM with the following
changes:
Added features:
•Improved TTFF and Position,
•EASY
•PPS sync with NMEA
Deleted features:
•SBAS
•Always Locate
•LOCUS
SL871 Product Features Table
Feature
SL871
SL871L
SL871-S
(Early Production)
SL871-S
SL871L-S
Constellations
Supported
GPS
QZSS
Glonass
BeiDou
Galileo
GPS
QZSS
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 (I2C / UART)
Yes (UART only)
Antenna Sense
Yes
No
Antenna On
Yes
Yes

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 13 of 89 2021-07-15
Not Subject to NDA
Feature
SL871
SL871L
SL871-S
(Early Production)
SL871-S
SL871L-S
Force On
Yes
No
Software
Upgradable
Yes
No
EPO
Yes
Yes (host)
Table 2: SL871 Family Product Features
Feature
SL871-S
(Early production)
SL871L-S
ROM version
3337
3337E (enhanced)
EASY
No
Yes
SBAS
Yes
No
AlwaysLocate
Yes
No
LOCUS
Yes
No
Table 3: ROM Features (-S modules only)
Block Diagrams
SL871 (Gen 2) Block Diagram
Figure 1: SL871 (Gen 2) Block Diagram

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 14 of 89 2021-07-15
Not Subject to NDA
SL871L Block Diagram
Figure 2: SL871L Block Diagram
SL871-S Block Diagram
Figure 3: SL871-S - Block Diagram

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 15 of 89 2021-07-15
Not Subject to NDA
SL871L-S Block Diagram
Figure 4: SL871L-S - Block Diagram

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 16 of 89 2021-07-15
Not Subject to NDA
Module Photo
Figure 5: SL871 Family Module –Photo
Note: All variants have similar appearance (except for the product
name).

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 17 of 89 2021-07-15
Not Subject to NDA
3. EVALUATION KIT
Please refer to the product Evaluation Kit User Guide for detailed information.
Figure 6: Evaluation Kit Contents
Note: The SL871 kit includes a GPS / GLONASS / BeiDou antenna.

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 18 of 89 2021-07-15
Not Subject to NDA
Evaluation Unit
Figure 7: SL871 Evaluation Unit

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 19 of 89 2021-07-15
Not Subject to NDA
4. PRODUCT FEATURES
Multi-Constellation Navigation (SL871 and SL871L only)
GPS and GLONASS constellations are enabled by default. If BeiDou is enabled, GLONASS
and Galileo are disabled.
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. PRNs 193, 194, and 195 are
supported. They provide ranging signals 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 SL871L-S modules (with the enhanced
ROM).
The receiver is capable of using SBAS satellites as a source of differential corrections.
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.
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.

SL871 Family Product User Guide
1VV0301170 Rev. 9 Page 20 of 89 2021-07-15
Not Subject to NDA
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 to a DGPS receiver either by radio 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.
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 (enhanced) version 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 AGPSS - Extended Prediction Orbit (EPO)
(SL871 and SL871L only)