Telit Wireless Solutions SE868-A, SE868-AS, SE868K3-A, SE868K7-A, SE868K3-AL Product User Manual

SE868Kx-Ax Family

Product User Guide

1VV0301201 Rev. 4

2018-07-20

SE868Kx-Ax 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 me mories or other media. Laws in
Italy and other countries preserve for Telit and its licensors cer tain 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 w ithout 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.

1VV0301201 Rev. 4 Page 2 of 82 2018-07-20

SE868Kx-Ax 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 a re copyrighted materials. M aking 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 o r service
names are the property of their respective owners.

V. Third Party Right s

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 LIMITATIO N LOST PROFIT S), HOWEVER CAUSED AND
WHETHER MADE UNDER CONTRACT, TORT OR OTHER LEGAL THEORY, ARISING IN ANY
WAY OUT OF THE USE OR DISTRIBUTION OF T HE OTHER CODE OR T HE 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.

1VV0301201 Rev. 4 Page 3 of 82 2018-07-20

SE868Kx-Ax Family Product User Guide Product Applicability

PRODUCT

SE868K3-A

SE868K3-AL

PRODUCT APPLICABILITY

SE868-A
SE868-AS

SE868K7-A
SE868K7-AL

Table 0-1 Product Applicability Table

1VV0301201 Rev. 4 Page 4 of 82 2018-07-20

SE868Kx-Ax Family Product User Guide Contents

CONTENTS

NOTICES .................................................................................................................................... 2

COPYRIGHTS ............................................................................................................................ 2

COMPUTER SOFTWARE COPYRIGHTS .................................................................................. 2

USAGE AND DISCLOSURE RESTRICTIONS ........................................................................... 3

PRODUCT APPLICABILITY ...................................................................................................... 4

CONTENTS ................................................................................................................................ 5

TABLES ..................................................................................................................................... 9

FIGURES .................................................................................................................................. 10

1 INTRODUCTION ........................................................................................................... 11

1.1 Purpose .................................................................................................................... 11

1.2 Contact and Support Information .............................................................................. 11

1.3 Related Documents and Downloads ......................................................................... 11

1.3.1 Related Documents and downloads ..................................................................... 11

1.3.2 Related Documents Requiring a Non-Disclosure Agreement ............................... 11

1.4 Text Conventions ...................................................................................................... 12

2 PRODUCT DESCRIPTION ........................................................................................... 13

2.1 Product Overview ..................................................................................................... 13

2.2 SE868xx-A Product Naming ..................................................................................... 14

2.3 Product Variants ....................................................................................................... 14

2.3.1 Multi-constellation modules (SE868-A and SE868K3-Ax) features ....................... 15

2.3.2 GPS-only modules (SE868-AS and SE868K7-Ax) features .................................. 15

2.3.3 Related Products .................................................................................................. 16

2.4 Block Di agrams ......................................................................................................... 17

2.4.1 Early Production ................................................................................................... 17

2.4.2 Current Production ............................................................................................... 18

2.5 Module Photos .......................................................................................................... 19

3 EVALUATION BOARD (EVB)....................................................................................... 21

4 PRODUCT FEATURES ................................................................................................ 22

4.1 Built-in Antenna ........................................................................................................ 22

4.2 Multi-Constellation Navigation (SE868-A and SE868K3-Ax only). ............................. 22

4.3 Quasi-Zenith Satellite System (QZSS) ...................................................................... 22

4.4 Satellite-Based Augmentation System (SBAS) ......................................................... 22

4.4.1 SBAS Corrections ................................................................................................ 22

4.5 Differential GPS (DGPS) ........................................................................................... 22

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SE868Kx-Ax Family Product User Guide Contents

4.6 Assisted GPS (AGPS) .............................................................................................. 23

4.6.1 Locally-generated AGPS - Embedded Assist System (EASY) .............................. 23

4.6.2 Server-generated AGPS - Extended Prediction Orbit (EPO) ................................ 23

4.6.3 Host EPO ............................................................................................................. 23

4.7 Elevation Mask Angle ............................................................................................... 24

4.8 Static Navigation ....................................................................................................... 24

4.9 Jamming Rejection – Active Interference Cancellation (AIC) .................................... 24

4.10 Internal LNA (SE868Kx-A/AL modules only) ............................................................ 25

4.11 10 Hz Navigation ...................................................................................................... 25

4.12 1PPS ........................................................................................................................ 25

4.13 Serial I/O Ports ......................................................................................................... 25

4.14 Power Management Modes ...................................................................................... 26

4.14.1 Full Power Continuous Mode ............................................................................... 26

4.14.2 Backup Mode (Perpetual) (SE868-A and SE868K3-Ax only) ............................... 27

4.14.3 Standby Modes .................................................................................................... 27

4.14.4 GLP Mode (SE868-A and SE868K3-Ax only) ...................................................... 27

4.14.5 Periodic Modes (SE868-A and SE868K3-Ax only) .............................................. 28

4.14.6 AlwaysLocate™ Modes (SE868-A and SE868K3-Ax only) ................................... 29

5 DATA RETENTI ON ....................................................................................................... 30

6 PRODUCT PERFORMANCE ........................................................................................ 31

6.1 Horizontal Position Accuracy .................................................................................... 31

6.2 Time to First Fix ........................................................................................................ 31

6.3 Sensitivity ................................................................................................................. 32

6.4 Jamming Mitigation Performance example ............................................................... 33

7 MESSAGE INTERFACE ............................................................................................... 34

7.1 NMEA Output Messages .......................................................................................... 34

7.1.1 Standard Messages ............................................................................................. 34

7.1.2 Proprietary Output Messages ............................................................................... 35

7.2 NMEA Input Commands ........................................................................................... 36

7.2.1 NMEA Commands List ......................................................................................... 36

8 FLASH UPGRADABILI TY ............................................................................................ 37

9 ELECTRICAL INTERFACE .......................................................................................... 38

9.1 SE868-A Family Pinout Diagram ............................................................................... 38

9.2 38

9.3 SE868-A Module Pinout Tables ................................................................................ 39

9.3.1 SE868-A Pinout Table .......................................................................................... 39

9.3.2 SE868-AS Pinout Table ....................................................................................... 40

9.3.3 SE868K3-A Pinout Table ..................................................................................... 41

9.3.4 SE868K7-A Pinout Table ..................................................................................... 42

9.4 SE868-Ax to SE868Kx-Ax Comparison and Migration .............................................. 43

9.4.1 SE868-A and SE868K3-Ax Pinout Comparison .................................................... 44

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SE868Kx-Ax Family Product User Guide Contents

9.4.2 SE868-AS and SE868K7-Ax Pinout Comparison ................................................. 45

9.5 DC Power Supply ..................................................................................................... 46

9.5.1 VCC ..................................................................................................................... 46

9.5.2 VBATT ................................................................................................................. 46

9.5.3 DC Power Requirements ...................................................................................... 46

9.5.4 DC Power Consumption: SE868-A ....................................................................... 47

9.5.5 DC Power Consumption: SE868-AS .................................................................... 47

9.5.6 DC Power Consumption: SE868K3-Ax ................................................................. 48

9.5.7 DC Power Consumption: SE868K7-Ax ................................................................. 48

9.6 Control and Status Signals ........................................................................................ 49

9.6.1 I/O Signal Levels .................................................................................................. 49

9.6.2 Control and Input Signals ..................................................................................... 50

9.6.3 Output Signals ...................................................................................................... 51

9.7 Serial I/O Ports ......................................................................................................... 52

9.8 Port U sage ................................................................................................................ 52

9.8.1 Primary (Port 0) Usage ......................................................................................... 52

9.8.2 Secondary (Port 1) Usage .................................................................................... 52

9.8.3 UART Port Operation ........................................................................................... 52

9.8.4 I

9.8.5 SPI Port Operation (MT3333-based modules only) ............................................. 53

2

C Port Operation (MT3333-based modules only) .............................................. 53

10 RF FRONT-END DESIGN ............................................................................................. 54

10.1 RF Signal Requirements ........................................................................................... 54

10.2 GNSS Antenna (included in the module) ................................................................... 55

10.3 Ground Plane............................................................................................................ 56

10.4 RF Interference ......................................................................................................... 57

10.5 Shielding ................................................................................................................... 57

11 REFERENCE DESIGN .................................................................................................. 58

12 MECHANICAL DRAWINGS .......................................................................................... 59

13 PCB FOOTPRINT ......................................................................................................... 60

14 PACKAGING AND HANDLING .................................................................................... 61

14.1 Product Marking and Serialization ............................................................................. 61

14.2 Product Packaging .................................................................................................... 62

14.3 Moisture Sensitivity ................................................................................................... 64

14.4 ESD Sensitivity ......................................................................................................... 66

14.5 Assembly Considerations.......................................................................................... 66

14.6 Washing Considerations ........................................................................................... 66

14.7 Reflow....................................................................................................................... 67

14.8 Safety ....................................................................................................................... 68

14.9 Disposal .................................................................................................................... 68

15 ENVIRONMENTAL REQUIREMENTS .......................................................................... 69

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SE868Kx-Ax Family Product User Guide Contents

15.1 Operating Environmental Limits ................................................................................ 69

15.2 Storage Environmental Limits ................................................................................... 69

16 COMPLIANCES ............................................................................................................ 70

16.1 EU (RED) Declarations of Co nformity ....................................................................... 71

17 SAFETY RECOMMENDATIONS .................................................................................. 77

18 GLOSSARY AND ACRONYMS .................................................................................... 78

19 DOCUMENT HISTORY ................................................................................................. 81

1VV0301201 Rev. 4 Page 8 of 82 2018-07-20

SE868Kx-Ax Family Product User Guide Tables

TABLES

Table 0-1 Product Applicability Table ........................................................................................ 4

Table 2-1 Product Variants.......................................................................................................14

Table 2-2 Multi-constellation (SE868-A and SE868K3-A) variants ...........................................15

Table 2-3 GPS-only (SE868-AS and SE868K7-Ax) variants ....................................................15

Table 2-4 ROM Features changes ............................................................................................16

Table 4-1 Power Management command summmary ...............................................................26

Table 5-1 Data Retention ..........................................................................................................30

Table 6-1 SE868xx-A Horizontal Position Accuracy ..................................................................31

Table 6-2 SE868xx-A Time to First Fix ......................................................................................31

Table 6-3 SE868-A Sensitivity ...................................................................................................32

Table 6-4 SE868Kx-Ax Sensitivity .............................................................................................32

Table 7-1 Default NMEA output messages ...............................................................................34

Table 7-2 Available Messages ..................................................................................................34

Table 7-3 NMEA Talker IDs ......................................................................................................35

Table 7-4 Proprietary Output Messages ....................................................................................35

Table 7-5 NMEA Input commands ............................................................................................36

Table 9-1 SE868-A Pinout Table ...............................................................................................39

Table 9-2 SE868-AS Pinout Table ...........................................................................................40

Table 9-3 SE868K3-Ax Pinout Table .........................................................................................41

Table 9-4 SE868K7-Ax Pinout Table .........................................................................................42

Table 9-5 SE868-A and SE868K3-A Pinout Comparison ..........................................................44

Table 9-6 SE868-AS and SE868K7-A Pinout Comparison ........................................................45

Table 9-7 DC Supply Voltage ....................................................................................................46

Table 9-8 SE868-A Power Consumption ...................................................................................47

Table 9-9 SE868-AS Power Consumption ................................................................................47

Table 9-10 SE868K3-Ax Power Consumption ...........................................................................48

Table 9-11 SE868K7-Ax Power Consumption ...........................................................................48

Table 9-12 Input Logic Levels: RX and Reset-N ........................................................................49

Table 9-13 Input Logic Levels: Force_On..................................................................................49

Table 9-14 Output Logic Levels: TX and 1PPS .........................................................................49

Table 10-1 Supported Constellations ........................................................................................55

Table 15-1 SE868 Family Operating Environmental Limits .......................................................69

Table 15-2 SE868 Family Storage Environmental Limits ...........................................................69

1VV0301201 Rev. 4 Page 9 of 82 2018-07-20

SE868Kx-Ax Family Product User Guide Figures

FIGURES

Figure 2-1 Product Naming ......................................................................................................14

Figure 2-2 SE868-Ax Block Diagram ........................................................................................17

Figure 2-3 SE868-ASx Block Diagram .....................................................................................17

Figure 2-4 SE868K3-Ax Block Diagram ....................................................................................18

Figure 2-5 SE868K7-Ax Block Diagram ...................................................................................18

Figure 2-6 SE868 Family Photo ...............................................................................................19

Figure 2-7 SE868xx-Ax Top View Photos .................................................................................20

Figure 3-1 SE868 Family Evaluation Board Photo ...................................................................21

Figure 4-1Jamming Rejection ...................................................................................................24

Figure 4-2 GNSS Low Power (GLP) mode diagram ..................................................................27

Figure 4-3 Periodic Modes diagram ..........................................................................................28

Figure 4-4 Periodic Mode example 1 .........................................................................................28

Figure 4-5 Periodic Mode example 2 .........................................................................................28

Figure 6-1 Jamming with AIC Disabled .....................................................................................33

Figure 6-2 Jamming with AIC Enabled ......................................................................................33

Figure 9-1 SE868-A Family Pinout Diagram ..............................................................................39

Figure 9-2 1PPS NMEA Synchronization ..................................................................................51

Figure 10-1 SE868 Family Ground Plane ..................................................................................56

Figure 11-1 SE868 Family Reference Design ..........................................................................58

Figure 12-1 SE868 Family (low profile) Mechanical Drawing .....................................................59

Figure 12-2 SE868 Family (high profile) Mechanical Drawing ...................................................59

Figure 13-1 SE868 Family Footprint .........................................................................................60

Figure 14-1 Product Label ........................................................................................................61

Figure 14-2 SE868 Family Label Description ...........................................................................61

Figure 14-3 SE868 Family - Tape Reel ....................................................................................62

Figure 14-4 SE868 Family - Tape Detail ...................................................................................63

Figure 14-5 Moisture Sensitive Device Label ............................................................................65

Figure 14-6 SE868 Family Recommended Reflow Profile ........................................................67

Figure 16-1 SE868-A EU RED Declaration of Conform ity .........................................................71

Figure 16-2 SE868-AS EU RED Declaration of Conform ity .......................................................72

Figure 16-3 SE868K3-A EU RED Declaration of Conformity .....................................................73

Figure 16-4 SE868K3-AL EU RED Declaration of Conformity ...................................................74

Figure 16-5 SE868K7-A EU RED Declaration of Conf ormity .....................................................75

Figure 16-6 SE868K7-AL EU RED Declaration of Conformity ...................................................76

1VV0301201 Rev. 4 Page 10 of 82 2018-07-20

SE868Kx-Ax Family Product User Guide Introduction

1 INTRODUCTION

1.1 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 the members of the product family.

1.2 Contact and Support Information

For general contact, technical support services, technical questions, and to report documentation
errors contact Telit Technical Support at:

• [e-mail]

• [e-mail]

• [e-mail]

• [e-mail] for Global Bluetooth support

• [e-mail] for Global Bluetooth 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.

1.3 Related Documents and Downloads

Please refer to https://www.telit.com/m2m-iot-products/positioning-timing-modules// for current
documentation and downloads

1.3.1 Related Documents and downloads

• Datasheets

• Product User Guides

• EVK User Guides

• Software User Guides

• Application Notes

• TelitView installation and documentation

1.3.2 Related Documents Requiring a Non-Disclosure Agreement

• Authorized Software User Guides

• Product firmware

1VV0301201 Rev. 4 Page 11 of 82 2018-07-20

SE868Kx-Ax Family Product User Guide Introduction

This information MUST be followed or catastrophic

Caution or Warning – T his is an important point about integrating the
system may malfunction or fail.

1.4 Text Conventions

Dates are in ISO 8601 format, i.e. YYYY-MM-DD.

Symbol Description

Danger –
equipment failure and/or bodily injury may occur.

product into a system. If this information is disre garded, the product or

Tip – This is advice or suggestion that may be useful w hen integrating
the product.

1VV0301201 Rev. 4 Page 12 of 82 2018-07-20

SE868Kx-Ax Family Product User Guide Product Description

2 PRODUCT DESCRIPTION

The SE868Kx-A GNSS family of GNSS receiver modules (with built-in antenna) 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 and Galileo signals to yield better coverage, greater accuracy, and improved
availability.

• Multi-constellation (MT3333): SE868-A and SE868K3-A/AL

• GPS-only (MT3337): SE868-AS and SE868K7-A/AL

Special features -

• These modules include a built-in 9 x 9 mm SMT patch antenna

2.1 Product Overview

• Complete GNSS receiver module including memory, LNA, TCXO, and RTC plus a built-in
patch antenna

• Constellations:
o SE868-A and SE868K3-A: GPS (L1), Glonass (L1), and BeiDou B 1with 99 search and 33

tracking channels. Galileo ready.

o SE868-AS and SE868K7-A: GPS(L1) and QZSS ranging with 66 search and 22 tracking

channels

• SBAS corrections capable

• 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)

• NMEA command input and data output

• Configurable fix reporting - Default: 1Hz, Max: 10 Hz

• Two serial ports for input commands and output messages

o SE868-A and SE868K3-Ax: The secondary serial port is I

via command

• 1PPS output

• SE868-A and SE868K3-Ax: 8 Megabit built-in flash memory

• SE868-AS and SE868K7-Ax: ROM memory

• Less than 100 mW total power consumption (Full Power mode – typical, GNSS )

• Power management modes for extended battery life

• Supported by evaluation kits

• -40°C to +85°C industrial temperature range

• 11 x 11 x 6.1 mm (nominal) 32-pad LGA package.

• Low profile (-AL) module height is 4.1 mm.

• Surface mountable by standard SMT equipment

• RoHS compliant design

(WAAS, EGNOS, etc.) (SE868-A and SE868K3-Ax only)

1
1

2

C, but is configurable for UART

Note 1: Pleas e refer t o Section 4.6 Assisted GPS (AGPS).

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SE868Kx-Ax Family Product User Guide Product Description

Figure

2.2 SE868xx-A Product Naming

2-1 Product Naming

Note - Early production modules:

• The ”K x x” fields are not present,

• The “–A” was replaced by “-AS” on SE868-AS and SE868K7-Ax (ROM) GPS-only modules

2.3 Product Variants

Module Chipset Constellations Memory Antenna Notes

SE868-A MT3333 Multi Flash High Early production

SE868-AS MT3337E GPS only ROM High Early production

SE868K3-A MT3333 Multi Flash High

SE868K3-AL MT3333 Multi Flash Low

SE868K7-A MT3337E GPS only ROM High

SE868K7-AL MT3337E GPS only ROM Low

Table 2-1 Product Variants

Please refer to Section 9.4 SE868-Ax to SE868Kx-Ax Comparison and Migration for
detailed pinout differences.

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SE868Kx-Ax Family Product User Guide Product Description

Feature

SE868-A

SE868K3-A

SE868K3-AL

Additional LNA

No

Yes

Yes

Antenna Profile

High

High

Low

Feature

SE868-AS

SE868K7-A

SE868K7-AL

GNSS chip

MT3337 or MT3337E

MT3337E

MT3337E

Antenna Profile

High

High

Low

AGPS (EASY)

MT3337E only

2.3.1 Multi-constellation modules (SE868-A and SE868K3-Ax) features

• MediaTek MT3333 engine

• GPS, QZSS, and GLONASS satellite signals. Galileo ready

• SBAS satellite sign als

• Flash memory with Upgradable firmware

• AGPS: Local (EASY) and server-based (EPO)

• Force-On pin

2

C (default) on the 2nd port. May be configured for UART or SPI

• I

Table 2-2 Multi-constellation (SE868-A and SE868K3-A) variants

2.3.2 GPS-only modules (SE868-AS and SE868K7-Ax) features

• MediaTek MT3337 (early production) or MT3337E (enhanced) engine

• GPS and QZSS satellite signals

• ROM memory

• AGPS: Local (EASY) and server-based (EPO)

o EASY requires MT3337E ROM.EASY data is stored in RTC RAM.
o EPO is host-based

• No Force-On pin

nd

• Only UART on t he 2

port. I2C is not available.

Table 2-3 GPS-only (SE868-AS and SE868K7-Ax) variants

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SE868Kx-Ax Family Product User Guide Product Description

SE868-AS
P/N SE868ASA210Rxxx

SE868-AS
P/N SE868ASA232Rxxx

SE868K7-Ax

SBAS

Yes

No

No

LOCUS

Yes

No

No

2.3.2.1 ROM Features (SE868-AS and SE868K7-Ax modules)

Feature

ROM version 3337 3337E (enhanced) 3337E (enhanced)
EASY No Yes Yes

AlwaysLocate Yes No No

(early production)

Table 2-4 ROM Features changes

2.3.3

The SE878Kx-Ax module is similar to the SE868Kx-Ax. Major differences are:

Related Products

• Module size is 18 x 18 x 6.2 mm.

The antenna is larger (17 x 17 mm)

•

• An RF switch and antenna input pin is provided to accept signals from an external antenna

1VV0301201 Rev. 4 Page 16 of 82 2018-07-20

SE868Kx-Ax Family Product User Guide Product Description

2.4 Block Diagrams

2.4.1 Early Production

Figure 2-2 SE868-Ax Block Diagram

Figure 2-3 SE868-ASx Block Diagram

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SE868Kx-Ax Family Product User Guide Product Description

2.4.2 Current Production

Figure 2-4 SE868K3-Ax Block Diagram

Figure 2-5 SE868K7-Ax Block Diagram

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SE868Kx-Ax Family Product User Guide Product Description

2.5 Module Photos

Figure 2-6 SE868 Family Photo

Note: All modules in the applicability table have a similar appearance.
The SE868Kx-AL (low profile) modules are 2 mm shorter that the SE868-AS shown

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SE868Kx-Ax Family Product User Guide Product Description

Figure 2-7 SE868xx-Ax Top View Photos

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SE868Kx-Ax Family Product User Guide Evaluation Board (EVB)

3 EVALUATION BOARD (EVB)

The EVB cont ains the module mounted on a PC Board to facilitate development and testing.
Please refer to the product Evaluation Board User Guide for detailed information.

Figure 3-1 SE868 Family Evaluation Board Photo

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SE868Kx-Ax Family Product User Guide Product Features

4 PRODUCT FEATURES

4.1 Built-in Antenna

The module includes a built-in antenna for GPS, Galileo and GLONASS signals. See section 10.2
GNSS Antenna (included in the module) for constellations supported by each module.

4.2 Multi-Const e ll a ti on Na vi ga t ion (SE868-A and SE868K3-Ax only).

GPS and GLONASS constellations are enabled by default. BeiDou and Galileo are also
supported. If BeiDou is enabled, GLONASS and Galileo are disabled.

The user may enable or disable constellations via the $PMTK353 command.

4.3 Quasi-Zenith Satellite System (QZSS)

The satellites of the Japanese regional system 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.

4.4 Satellite-Based Augmentation System ( S BAS)

SBAS is not supported on the current production SE868-AS and SE868K7-Ax 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 and in the same L1 band.

Enabling SBAS limits the maximum fix r ate 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.

4.4.1 SBAS Corrections

The SBAS satellites transmit a set of differential corrections to their respective regions. The use
of SBAS corrections can improve positioning accuracy

4.5 Differential GPS (DGPS)

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 compu te a se t of co rrections w hich are transmitted, ei ther by
radio to a DGPS receiver or over the internet.

The DGPS receiver can then send them to the module 2nd serial port (RX2) using the RTCM SC­104 Version 2.3 protocol message types 1, 2, 3, and 9.

These corrections can significantly improve the accuracy of the position reported to the user.
The MT3333-based modules can accept either the RTCM SC-104 messages or SBAS di fferential

corrections via command $PMTK501.

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4.6 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.

Please refer to Section 2.3 Product Variants for applicability.

4.6.1 Locally-generated AGPS - Embedded Assist System (EASY)

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.

Please refer to Section 2.3 Product Variants for applicability.

4.6.2 Server-generated AGPS - Extended Prediction Orbit (EPO)

(SE868-A and SE868K3-Ax 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 a serial
port. These predictions do not require local broadcast ephemeris collection, and are valid for up
to 14 days.

The SE868-A and SE868K3-Ax modules support server-based AGPS as a standard feature.
Please refer to the next section regarding EPO support (Host EPO) on the SE868-AS and
SE868K7-Ax modules.

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.

4.6.3 Host EPO

The SE868-AS and SE868K7-Ax modules 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 server­generated EPO data and send it to the module over the 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.
Contact Telit support for further details.

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4.7 Elevation Mask Angle

The default elevation mask angle is 5°. It can be changed via the $PMTK311 command.

4.8 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 $PMTK386 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 the $PMTK386 command.

4.9 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 dB m), 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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4.10 Internal LNA (SE868Kx-A/AL modules only)

The current-production modules include a built-in LNA to improve sensitivity.

4.11 10 Hz Navigation

The default rate of 1 Hz can be changed by command $PMTK500 to a maximum of 10 Hz.
The SE868-AS and SE868K7-A maxim um is 5 Hz.
Enabling the SBAS feature limits the maximum fix rate to 5 Hz.

4.12 1PPS

1PPS is a one pulse per second output signal.
Please refer to Section 9.6.3.1 1PPS for details.

4.13 Serial I/O Ports

Port 0:
All modules include a primary UART serial port.
Port 1:
The secondary port on MT3333-based modules is I2C by default, but can be chan ged to UAR T or

SPI via command.
The secondary port on MT3337-based modules is UART and cannot be changed.
Please refer to Section 9.7 Serial I/O Ports for details.

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