LEA-M8S
u-blox M8 concurrent GNSS module
Data Sheet
Abstract
Technical data sheet describing the LEA-M8S module, which provides concurrent reception of up to 3 GNSS
(GPS, Galileo, GLONASS, BeiDou). LEA-M8S is pin-compatible to LEA-6 modules.
www.u-blox.com
UBX-16010205 - R03
LEA-M8S - Data Sheet
Document Information
Title
LEA-M8S
Subtitle
u-blox M8 concurrent GNSS module
Document type
Data Sheet
Document number
UBX-16010205
Revision and date
R03
Document status
Production Information
28-Jan-2019
Product status
Corresponding content status
In Development /
Prototype
Objective Specification
Target values. Revised and supplementary data will be published later.
Engineering Sample
Advance Information
Data based on early testing. Revised and supplementary data will be published later.
Initial Production
Early Production Information
Data from product verification. Revised and supplementary data may be published later.
Mass Production /
End of Life
Production Information
Document contains the final product specification.
This document applies to the following products:
Product name
Type number
ROM/FLASH version
PCN reference
LEA-M8S
LEA-M8S-0-10
ROM SPG 3.01
UBX-16012752
u-blox or third parties may hold intellectual property rights in the products, names, logos and designs included in this
document. Copying, reproduction, modification or disclosure to third parties of this document or any part thereof is only
permitted with the express written permission of u-blox.
The information contained herein is provided “as is” and u-blox assumes no liability for its use. No warranty, either express or
implied, is given, including but not limited to, with respect to the accuracy, correctness, reliability and fitness for a particular
purpose of the information. This document may be revised by u-blox at any time without notice. For the most recent
documents, visit www.u-blox.com.
Copyright © u-blox AG.
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LEA-M8S - Data Sheet
Contents
Document Information ................................................................................................................................ 2
Contents .......................................................................................................................................................... 3
1
Functional description ......................................................................................................................... 5
1.1 Overview ........................................................................................................................................................ 5
1.2 Product features ......................................................................................................................................... 5
1.3 Performance ................................................................................................................................................. 6
1.4 Block diagram .............................................................................................................................................. 7
1.5 Supported GNSS Constellations ............................................................................................................. 7
1.5.1
GPS ........................................................................................................................................................ 7
1.5.2
GLONASS ............................................................................................................................................. 8
1.5.3
BeiDou ................................................................................................................................................... 8
1.5.4
Galileo .................................................................................................................................................... 8
1.6 Assisted GNSS (A-GNSS) .......................................................................................................................... 8
1.6.1
AssistNowTM Online ......................................................................................................................... 8
1.6.2
AssistNowTM Offline ........................................................................................................................... 9
1.6.3
AssistNowTM Autonomous ............................................................................................................... 9
1.7 Augmentation Systems ............................................................................................................................ 9
1.7.1
Satellite-Based Augmentation System (SBAS) ........................................................................... 9
1.7.2
QZSS ..................................................................................................................................................... 9
1.7.3
IMES ....................................................................................................................................................10
1.7.4
IMES reception is disabled by default.Differential GPS (D-GPS) ............................................10
1.8 Broadcast navigation data and satellite signal measurements .....................................................10
1.9 Odometer ....................................................................................................................................................10
1.10 Geofencing..................................................................................................................................................10
1.11 Message Integrity Protection .................................................................................................................11
1.12 Spoofing Detection ...................................................................................................................................11
1.13 EXTINT: External interrupt......................................................................................................................11
1.13.1 Pin Control ..........................................................................................................................................11
1.13.2 Aiding ..................................................................................................................................................11
1.14 TIMEPULSE ................................................................................................................................................11
1.15 Protocols and interfaces .........................................................................................................................12
1.16 Interfaces ....................................................................................................................................................12
1.16.1 UART ...................................................................................................................................................12
1.16.2 USB ......................................................................................................................................................12
1.16.3 Display Data Channel (DDC) ...........................................................................................................12
1.17 Clock generation........................................................................................................................................13
1.17.1 TCXO Oscillator .................................................................................................................................13
1.17.2 Real-Time Clock (RTC) .....................................................................................................................13
1.18 Power management .................................................................................................................................13
1.18.1 DC/DC converter ...............................................................................................................................13
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1.18.2 Power Mode Setup............................................................................................................................13
1.18.3 Continuous Mode ..............................................................................................................................13
1.18.4 Power Save Mode ..............................................................................................................................14
1.19 Antenna .......................................................................................................................................................14
1.19.1 Antenna supervisor and short circuit detection ........................................................................14
2
Pin Definition ........................................................................................................................................ 15
2.1 Pin assignment ..........................................................................................................................................15
2.1.1
Pin name changes.............................................................................................................................16
3
Configuration management ............................................................................................................ 17
4
Electrical specification ..................................................................................................................... 18
4.1 Absolute maximum rating.......................................................................................................................18
4.2 Operating conditions ................................................................................................................................18
4.3 Indicative current requirements ............................................................................................................19
5
Mechanical specifications ............................................................................................................... 20
6
Reliability tests and approvals....................................................................................................... 21
6.1 Reliability tests ..........................................................................................................................................21
6.2 Approvals ....................................................................................................................................................21
7
Product handling & soldering.......................................................................................................... 22
7.1 Packaging ...................................................................................................................................................22
7.1.1
Reels ....................................................................................................................................................22
7.1.2
Tapes ...................................................................................................................................................22
7.2 Shipment, storage and handling ...........................................................................................................22
7.2.1
Moisture Sensitivity Levels ............................................................................................................22
7.2.2
Reflow soldering ................................................................................................................................23
7.2.3
ESD handling precautions ..............................................................................................................23
8
Default messages ............................................................................................................................... 24
9
Labeling and ordering information ............................................................................................... 25
9.1 Product labeling.........................................................................................................................................25
9.2 Explanation of codes ................................................................................................................................25
9.3 Ordering codes ...........................................................................................................................................25
Appendix ....................................................................................................................................................... 26
A
Glossary ................................................................................................................................................. 26
Related documents ................................................................................................................................... 27
Revision history .......................................................................................................................................... 27
Contact .......................................................................................................................................................... 28
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1
Functional description
1.1 Overview
The LEA-M8S module delivers concurrent GNSS location capability together with high-performance
u-blox M8 positioning technology in the industry proven LEA form factor.
With its dual-frequency RF front-end, the u-blox M8 concurrent GNSS engine is able to intelligently
use the highest number of visible satellites from up to three GNSS systems (GPS/Galileo together
with GLONASS or BeiDou) for more reliable positioning. The LEA-M8S provides exceptional
performance with low system power, and is optimized for cost sensitive applications. It also supports
message integrity protection, geofencing, and spoofing detection.
The LEA-M8S module has sophisticated RF-architecture and interference suppression ensuring
maximum performance even in GNSS hostile environments. It features very low power GLONASS
functionality. This 6th generation module in the LEA form factor allows simple migration from LEA6x GPS and LEA-6N GPS/GLONASS modules.
The LEA-M8S module combines a high level of robustness and integration capability with flexible
connectivity options. The DDC (I2C compliant) interface provides connectivity and enables synergies
with most u-blox cellular modules. For RF optimization, the LEA-M8S features a front-end SAW filter
for increased jamming immunity.
LEA-M8S module uses u-blox GNSS chips qualified according to AEC-Q100 and are manufactured in
ISO/TS 16949 certified sites. Qualification tests are performed as stipulated in the ISO16750
standard: “Road vehicles – Environmental conditions and testing for electrical and electronic
equipment”.
The u-blox LEA-M8S module can also benefit from the u-blox AssistNow assistance service. The
Online service provides GNNS broadcast parameters, e.g. ephemeris, almanac plus time or rough
position to reduce the receiver’s time to first fix significantly and improve acquisition sensitivity. The
extended validity of AssistNow Offline data (up to 35 days) and AssistNow Autonomous data (up to 3
days) provide faster acquisition after a long off time.
☞
See section 1.6 for more information concerning the LEA-M8S module related AssistNow
Assistance.
1.2 Product features
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1.3 Performance
Parameter
Specification
Receiver type
72-channel u-blox M8 engine
GPS L1C/A, SBAS L1C/A, QZSS L1C/A, QZSS L1 SAIF, GLONASS L1OF, BeiDou B1I, Galileo E1B/C
Accuracy of time
pulse signal
RMS
99%
30 ns
60 ns
Frequency of time
pulse signal
0.25 Hz…10 MHz
(configurable)
Operational limits 1 Dynamics
≤4g
Velocity accuracy
Altitude
50,000 m
Velocity
500 m/s
2
0.05m/s
Heading accuracy 2
0.3 degrees
GNSS
GPS & GLONASS
GPS
GLONASS
BeiDou
Galileo
Horizontal position
accuracy 3
2.5 m
2.5 m
4.0 m
3.0 m
TBC 4
Max navigation
update rate
10 Hz
18 Hz
18 Hz
18 Hz
18 Hz
Cold start
26 s
29 s
30 s
34 s
45 s
Hot start
1s
1s
1s
1s
1s
2s
2s
2s
3s
7s
Tracking &
Navigation
–167 dBm
–166 dBm
-166 dBm
-160 dBm
-159 dBm
Reacquisition
–160 dBm
–160 dBm
-156 dBm
-157 dBm
-153 dBm
Cold start
–148 dBm
–148 dBm
-145 dBm
-143 dBm
-138 dBm
Hot start
–157 dBm
–157 dBm
-156 dBm
-155 dBm
-151 dBm
Time-To-First-Fix 5
Aided starts
Sensitivity
7
6
Table 1: LEA-M8S performance in different GNSS modes (default: concurrent reception of GPS and GLONASS incl. QZSS,
SBAS)
1
2
3
4
5
6
7
Assuming Airborne < 4 g platform
50% @ 30m/s
CEP, 50%, 24 hours static, -130 dBm, > 6 SVs
To be confirmed when Galileo reaches full operational capability
All satellites at -130 dBm, except Galileo at -127 dBm
Dependent on aiding data connection speed and latency
Demonstrated with a good external LNA
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1.4 Block diagram
Figure 1: LEA-M8S block diagram
1.5 Supported GNSS Constellations
The LEA-M8S GNSS module is a concurrent GNSS receiver which can receive and track multiple GNSS
systems: GPS, Galileo, GLONASS and BeiDou. Owing to the dual-frequency RF front-end architecture,
either GLONASS or BeiDou can be processed concurrently with GPS and Galileo signals providing
reception of three GNSS systems. By default the M8 receivers are configured for concurrent GPS and
GLONASS, including SBAS and QZSS reception. If power consumption is a key factor, then the
receiver should be configured for a single GNSS operation using GPS, Galileo, GLONASS or BeiDou and
disabling QZSS and SBAS. The module can be configured to receive any single GNSS constellation or
within the set of permissible combinations shown below.
GPS
Galileo
GLONASS
BeiDou
•
•
–
–
•
•
•
–
•
•
–
•
•
–
•
–
•
–
–
•
–
•
•
–
–
•
–
•
–
–
•
•
Table 2: Permissible GNSS combinations (• = enabled)
☞
The augmentation systems: SBAS and QZSS can be enabled only if GPS operation is configured.
☞
Galileo is not enabled as the default configuration.
1.5.1
GPS
The LEA-M8S GNSS module is designed to receive and track the L1C/A signals provided at
1575.42 MHz by the Global Positioning System (GPS).
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1.5.2
GLONASS
The LEA-M8S module can receive and process the GLONASS satellite system as an alternative to
GPS. The u-blox LEA-M8S positioning module is designed to receive and track the L1OF signals
GLONASS transmits at 1602 MHz + k*562.5 kHz, where k is the satellite’s frequency channel number
(k = –7,..., 5, 6). The ability to receive and track GLONASS L1OF satellite signals allows design of
GLONASS receivers where required by regulations.
To take advantage of GPS and GLONASS, dedicated hardware preparation must be made during the
design-in phase. See the LEA-M8S / M8T Hardware Integration Manual [1] for u-blox design
recommendations.
1.5.3
BeiDou
The LEA-M8S GNSS module can receive and process BeiDou concurrently with GPS or GLONASS. ublox LEA-M8S module is designed to receive and track the B1 signals provided at 1561.098 MHz by
the BeiDou Navigation Satellite System. The ability to receive and track BeiDou B1 satellite signals in
conjunction with GPS results in higher coverage, improved reliability and better accuracy. Global
coverage is scheduled for 2020.
1.5.4
Galileo
The LEA-M8S positioning module can receive and track the E1-B/C signals centered on the GPS L1
frequency band. GPS and Galileo signals can be processed concurrently together with either BeiDou
or GLONASS signals, enhancing coverage, reliability and accuracy. The SAR return link message
(RLM) parameters for both short and long versions are decoded by the receiver and made available to
users via UBX proprietary messages.
☞
Galileo has been implemented according to ICD release 1.2 (November 2015) and verified with live
signals from the Galileo in-orbit validation campaign. Since the Galileo satellite system has not yet
reached Initial (IOC) nor Full Operational Capability (FOC), changes to the Galileo signal
specification (OS SIS ICD) remain theoretically possible.
☞
Galileo reception is by default disabled, but can be enabled by sending a configuration message
(UBX-CFG-GNSS) to the receiver. See the u-blox 8 / u-blox M8 Receiver Description Including
Protocol Specification [2] for more information.
1.6 Assisted GNSS (A-GNSS)
Supply of aiding information, such as ephemeris, almanac, rough user position and time, will reduce
the time to first fix significantly and improve the acquisition sensitivity. All u-blox M8 products
support the u-blox AssistNow Online and AssistNow Offline A-GNSS services, support AssistNow
Autonomous, and are OMA SUPL compliant.
1.6.1
AssistNowTM Online
With AssistNow Online, an Internet connected host downloads assistance data from the u-blox
AssistNow Online service to the receiver at system start-up. The Multi-GNSS Assistance (MGA)
service is an HTTP protocol based network operator independent service.
Supplying assistance information, such as ephemeris, almanac, a rough last position and time, can
reduce the time to first fix significantly and improve acquisition sensitivity.
☞
The AssistNow Online service provides data for GPS, GLONASS, BeiDou, Galileo and QZSS.
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1.6.2
AssistNowTM Offline
With the AssistNow Offline service, users can download long-term orbit data over the Internet at their
convenience. The orbit data can be stored in the GNSS receiver’s SQI flash memory or alternatively
within the memory of the application processor. The function requires no connectivity at system
start-up, enabling a position fix within seconds, even when no network is available. AssistNow Offline
offers augmentation for up to 35 days.
☞
AssistNow Offline service provides data for GPS and GLONASS only, BeiDou and Galileo are not
currently supported.
1.6.3
AssistNowTM Autonomous
AssistNow Autonomous operation provides aiding information without the need for a host or external
network connection. Based on previous broadcast satellite ephemeris data downloaded to and stored
by the GNSS receiver, AssistNow Autonomous automatically generates accurate predictions of
satellite orbital data (“AssistNow Autonomous data”) that is usable for future GNSS position fixes.
The concept capitalizes on the periodic nature of GNSS satellite orbits by capturing strategic
ephemeris data at specific times of the day. For LEA-M8S module, AssistNow Autonomous can
calculate GPS only orbit predictions for up to 3 days.
u-blox’s AssistNow Autonomous benefits are:
•
•
•
•
Faster fix in situations where GNSS satellite signals are weak
No connectivity required
Compatible with AssistNow Online (can work stand-alone, or in tandem with the AssistNow Online
service)
No integration effort; calculations are done in the background, transparent to the user.
☞
For more details on A-GNSS see the u-blox 8 / u-blox M8 Receiver Description Including Protocol
Specification [2].
☞
For best AssistNow Autonomous performance, it is recommended to use u-blox M8 flash-based
receivers.
1.7 Augmentation Systems
1.7.1
Satellite-Based Augmentation System (SBAS)
The LEA-M8S module supports reception of SBAS broadcast signals. These systems supplement
GNSS data with additional regional or wide area GPS augmentation data. The system broadcasts
range correction and integrity information via satellite which can be used by GNSS receivers to
improve resulting precision. SBAS satellites can be used as additional satellites for ranging
(navigation), further enhancing availability. The following SBAS types are supported: GAGAN, WAAS,
EGNOS and MSAS.
☞
For more details see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification
[2].
1.7.2
QZSS
The Quasi-Zenith Satellite System (QZSS) is a regional navigation satellite system that transmits
additional GPS L1 C/A signals for the Pacific region covering Japan and Australia. The LEA-M8S
positioning module is able to receive and track these signals concurrently with GPS signals, resulting
in better availability especially under challenging signal conditions, e.g. in urban canyons. The L1- SAIF
signal provided by QZSS can be enabled for reception via a GNSS configuration message.
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1.7.3
IMES
The Japanese Indoor MEssaging System (IMES) system is used for indoor position reporting using
low-power transmitters which broadcast a GPS–like signal. The LEA-M8S module can be configured
to receive and demodulate the signal to provide an in-door location estimate.
☞
This service is authorized and available only in Japan.
1.7.4
IMES reception is disabled by default.Differential GPS (D-GPS)
The LEA-M8S module supports Differential-GPS data according RTCM 10402.3: “RECOMMENDED
STANDARDS FOR DIFFERENTIAL GNSS”. The use of Differential-GPS data improves GPS position
accuracy. RTCM cannot be used together with SBAS. The RTCM implementation supports the
following RTCM 2.3 messages:
Message Type
Description
1
Differential GPS Corrections
2
Delta Differential GPS Corrections
3
GPS Reference Station Parameters
9
GPS Partial Correction Set
Table 3: Supported RTCM 2.3 messages
☞
For more details see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification
[2].
1.8 Broadcast navigation data and satellite signal
measurements
The LEA-M8S can output all the GNSS broadcast data upon reception from tracked satellites. This
includes all the supported GNSS signals plus the augmentation services SBAS, QZSS and IMES. The
receiver also makes available the tracked satellite signal information, i.e. raw code phase and Doppler
measurements in a form aligned to the ETSI mobile cellular location services protocol (RRLP) [5]. For
more details see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification [2].
1.9 Odometer
The odometer provides information on travelled ground distance (in meters) based on the position
and Doppler-based velocity output from the navigation solution. For each computed travelled
distance since the last odometer reset, the odometer estimates a 1-sigma accuracy value. The total
cumulative ground distance is maintained and saved in the BBR memory.
☞
The odometer feature is disabled by default. For more details see the u-blox 8 / u-blox M8 Receiver
Description Including Protocol Specification [2].
1.10 Geofencing
The LEA-M8S module supports up to four circular Geofencing areas defined on the Earth’s surface
using a 2D model. Geofencing is active when at least one Geo-fence is defined, the current status can
be found by polling the receiver. A GPIO pin can be nominated to indicate status to e.g. wake up a host
on activation.
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1.11 Message Integrity Protection
The LEA-M8S module provides a function to detect third party interference with the UBX message
steam sent from receiver to host. The security mechanism “signs” nominated messages via a
subsequent UBX message. This message signature is then compared with one generated by the host
to determine if the message data has been altered. The signature algorithm seed can use one fixed
secret ID-key set by eFuse in production and a dynamic ID-key set by the host, enabling users to detect
‘man-in-the-middle’ style attacks.
1.12 Spoofing Detection
Spoofing is a process whereby a malicious third party tries to control the reported position via a “fake”
GNSS broadcast signal. This may result in the form of reporting incorrect position, velocity or time.
To combat against this, the LEA-M8S module includes spoofing detection measures to alert the host
when signals appear to be suspicious. The receiver combines a number of checks on the received
signals looking for inconsistencies across several parameters.
☞
This feature does not guarantee to detect all spoofing attacks.
1.13 EXTINT: External interrupt
EXTINT0, EXTINT1 are external interrupt pins with fixed input voltage thresholds with respect to
VCC. They can be used for control of the receiver or for aiding time or frequency.
1.13.1 Pin Control
The pin control feature allows overriding the automatic active/inactive cycle of Power Save Mode. The
state of the receiver can be controlled through the nominated EXTINT pin.
The receiver can also be forced OFF using EXTINT when Power Save Mode is not active.
1.13.2 Aiding
The EXTINT pins can be used to supply time or frequency aiding data to the receiver.
For time aiding, hardware time synchronization can be achieved by connecting an accurate time pulse
to a nominated EXTINT pin.
Frequency aiding can be implemented by connecting a periodic rectangular signal with a frequency of
up to 500 kHz and arbitrary duty cycle (the low/high phase duration must be greater than 50 ns) to
the nominated EXTINT pin. The applied aiding frequency value is given to the receiver using UBX
messages.
For more information about how to implement and configure these features, see the u-blox 8 / u-blox
M8 Receiver Description including Protocol Specification [2].
The EXTINT1 pin can also be configured as an active antenna open circuit detection function
(ANT_DET_N). For further information see 1.19.1 and the LEA-M8S / M8T Hardware Integration
Manual [1].
1.14 TIMEPULSE
A configurable time pulse signal is available with the LEA-M8S module.
The TIMEPULSE output generates pulse trains synchronized with GPS or UTC time grid with intervals
configurable over a wide frequency range. Thus it may be used as a low frequency time
synchronization pulse or as a high frequency reference signal.
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By default the time pulse signal is configured to 1 pulse per second. For more information see the ublox 8 / u-blox 8 / u-blox M8 Receiver Description including Protocol Specification [2].
1.15 Protocols and interfaces
Protocol
Type
NMEA 0183, version 4.0 (V2.1, V2.3 or V4.1 configurable)
Input/output, ASCII
UBX
Input/output, binary, u-blox proprietary
RTCM 2.3
Input, message 1, 2, 3, 9
Table 4: Available Protocols
All protocols are available on UART, USB and DDC (I2C compliant). For specification of the various
protocols see the u-blox 8 / u-blox M8 Receiver Description including Protocol Specification [2].
1.16 Interfaces
A number of interfaces are provided either for data communication or memory access. The embedded
firmware uses these interfaces according to their respective protocol specifications.
1.16.1 UART
The LEA-M8S module includes one UART interface, which can be used for communication to a host.
It supports configurable baud rates. For supported baud rates see the u-blox 8 / u-blox M8 Receiver
Description including Protocol Specification [2].
☞
Designs must allow access to the UART and the SAFEBOOT_N function pin for future service and
reconfiguration.
1.16.2 USB
A USB interface, which is compatible to USB version 2.0 FS (Full Speed, 12 Mbit/s), can be used for
communication as an alternative to the UART. The pull-up resistor on pin USB_DP is integrated to
signal a full-speed device to the host. The VDD_USB pin supplies the USB interface. The u-blox USB
(CDC-ACM) driver supports Windows Vista plus Windows 7 and 8 operating systems. A separate
driver (CDC-ACM) is not required for Windows 10 which has a built-in USB-serial driver. However,
plugging initially into an internet connected Windows 10 PC, will down-load the u-blox combined
sensor and VCP driver package.
☞
USB drivers can be down-loaded from the u-blox web site, www.u-blox.com.
1.16.3 Display Data Channel (DDC)
An I2C compliant DDC interface is available for communication with an external host CPU or u-blox
cellular modules. The interface can be operated in slave mode only. The DDC protocol and electrical
interface are fully compatible with Fast-Mode of the I2C industry standard. Since the maximum SCL
clock frequency is 400 kHz, the maximum transfer rate is 400 kb/s.
The DDC interface is I2C Fast Mode compliant. For timing parameters consult the I2C standard.
☞
The maximum bit rate is 400 kb/s. The interface stretches the clock when slowed down when
serving interrupts, so real bit rates may be slightly lower.
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1.17 Clock generation
1.17.1 TCXO Oscillator
The LEA-M8S module uses a TCXO reference oscillator. The TCXO allows accelerated weak signal
acquisition, enabling faster start and reacquisition times.
Oscillators used on the LEA-M8S module are carefully selected and screened for stability and against
frequency perturbations across the full operating range (–40° to +85°C).
The careful selection and qualification of critical parts, such as GNSS oscillators, has resulted in ublox modules being the most reliable positioning modules in the industry, particularly in challenging
conditions.
1.17.2 Real-Time Clock (RTC)
The RTC is driven by a 32 kHz oscillator using an external RTC crystal. If the main supply voltage fails,
and a battery is connected to V_BCKP, parts of the receiver switch off, but the RTC still runs providing
a timing reference for the receiver. This operating mode is called Hardware Backup Mode, which
enables all relevant data to be saved in the backup RAM to allow a hot or warm start later.
1.18 Power management
The LEA-M8S GNSS module offers a power-optimized architecture with built-in autonomous power
saving functions to minimize power consumption at any given time. Furthermore, the receiver can be
used in two operating modes: Continuous mode for best performance or Power Save Mode for
optimized power consumption respectively.
1.18.1 DC/DC converter
The LEA-M8S module integrates a DC/DC converter, allowing reduced power consumption especially
when using a main supply voltage above 2.5 V.
☞
For more information see the LEA-M8S / M8T Hardware Integration Manual [1]
1.18.2 Power Mode Setup
The u-blox LEA-M8S module can be configured to run in either continuous mode or a choice of Power
Save mode configurations. A template of power mode settings can be used to easily select typical
power mode setups to cover the majority of users’ requirements. For more information, see section
1.18.4.
The u-blox M8 receivers’ power mode setup offers a choice of continuous operation and preset Power
Save Mode Configurations:
•
•
•
•
Continuous (default) mode for best GNSS performance vs power consumption
Continuous with no compromise in power consumption
A 1 Hz cyclic tracking mode for aggressive power reduction
Choice of 2 or 4 Hz 8 cyclic tracking modes for typical wearable applications
1.18.3 Continuous Mode
Continuous Mode uses the acquisition engine at full performance resulting in the shortest possible
TTFF and the highest sensitivity. It searches for all possible satellites until the Almanac is completely
downloaded. The receiver then switches to the tracking engine to lower power consumption.
8
Single GNSS constellation configuration only
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Thus, a lower tracking current consumption level will be achieved when:
•
•
•
A valid GNSS position is obtained
The entire Almanac has been downloaded
The Ephemeris for each satellite in view is valid
1.18.4 Power Save Mode
For power sensitive applications, u-blox M8 receivers provide a Power Save Mode for reduced power
consumption.
Power Save Mode provides two dedicated methods, ON/OFF and Cyclic tracking, that reduce average
current consumption in different ways to match the needs of the specific application. These
operations can be set by using a specific UBX message.
☞
For more information about power management strategies, see the u-blox 8 / u-blox M8 Receiver
Description including Protocol Specification [2].
1.19 Antenna
The LEA-M8S module is designed for use with passive and active 9 antennas.
Parameter
Specification
Antenna Type
Active Antenna Recommendations
Passive and active antenna
Minimum gain
Maximum gain
Maximum noise figure
15 dB (to compensate signal loss in RF cable)
50 dB
1.5 dB
Table 5: Antenna Specifications for LEA-M8S module
1.19.1 Antenna supervisor and short circuit detection
An antenna supervisor is available with LEA-M8S receiver. The antenna supervisor enables the
receiver to detect short circuits at the active antenna and shut down the voltage bias immediately. A
resistor is needed in series with the V_ANT input to enable checking of the antenna bias voltage. UBX
and NMEA messages are provided to report the condition of the antenna supply. Open circuit
detection can also be supported with an additional external circuit.
☞
9
Antenna open circuit detection can be connected to the EXTINT1 pin after a configuration change.
For more information see the LEA-M8S / M8T Hardware Integration Manual [1].
For information on using active antennas with LEA-M8S module, see the LEA-M8S/M8T Hardware Integration Manual [1].
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2
Pin Definition
2.1 Pin assignment
Figure 2: Pin Assignment
No
Name
I/O
Description
1
SDA
I/O
DDC Data
2
SCL
I/O
DDC Clock
3
TXD
O
Serial Port 1
4
RXD
I
5
Reserved
6
VCC
I
Supply voltage
7
GND
I
Ground (digital)
8
VCC_OUT
O
9
Reserved
10
RESET_N
I
External Reset
11
V_BCKP
I
Backup voltage supply
12
SAFEBOOT_N
I
SAFEBOOT_N (for future service and reconfiguration, leave OPEN)
13
GND
I
Ground
14
GND
I
Ground
15
GND
I
Ground
16
RF_IN
I
GNSS signal input
17
GND
I
Ground
18
VCC_RF
O
Output Voltage RF section
19
V_ANT
I
Antenna Bias voltage
20
EXTINT1
I
External Interrupt, can be configured as active antenna open circuit detection pin: ANT_DET_N
21
Reserved
Not Connected
22
Reserved
Not Connected
23
Reserved
Not Connected
24
VDD_USB
25
USB_DM
I/O
USB Data
26
USB_DP
I/O
USB Data
27
EXTINT0
I
External Interrupt Pin
28
TIMEPULSE
O
Timepulse (1 PPS)
Serial Port 1
Not Connected
Output voltage
Not Connected
I
USB Supply
Table 6: Pinout
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☞
Pins designated Reserved should only be used with caution. For more information about pinouts
see the LEA-M8S / M8T Hardware Integration Manual [1].
2.1.1
Pin name changes
Selected pin names have been updated to agree with a common naming convention across u-blox
modules. The pins have not changed their operation and are the same physical hardware but with
updated names. The table below lists the pins that have changed name along with their old and new
names.
No
Previous Name
New name
3
TxD
TXD
4
RxD
RXD
12
Reserved
SAFEBOOT_N
20
AADET_N
EXTINT1
Table 7: Pin name changes
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3
Configuration management
Configuration settings can be modified with UBX configuration messages. The modified settings
remain effective until power-down or reset. If these settings have been stored in battery-backup RAM,
then the modified configuration will be retained, as long as the backup battery supply is not
interrupted.
☞
For more information about configuration management, see the u-blox 8 / u-blox M8 Receiver
Description including Protocol Specification [2].
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4
Electrical specification
☞
The limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134).
Stress above one or more of the limiting values may cause permanent damage to the device. These
are stress ratings only and operation of the device at these or at any other conditions above those
given in the characteristics sections of the specification is not implied. Exposure to these limits
for extended periods may affect device reliability.
☞
Where application information is given, it is advisory only and does not form part of the
specification. For more information see the LEA-M8S / M8T Hardware Integration Manual [1].
4.1 Absolute maximum rating
Parameter
Symbol
Power supply voltage
Backup battery voltage
Condition
Min
Max
Units
VCC
–0.5
3.6
V
V_BCKP
–0.5
3.6
V
USB supply voltage
VDD_USB
–0.5
3.6
V
Input pin voltage
Vidig
–0.5
VCC+0.5
V
–0.5
3.6
V
–0.5
VDD_USB
V
10
mA
100
mA
15
dBm
Input voltage on Configurable
Inputs, RESET_N if VCC < 3.1 V
Input voltage on Configurable
Inputs, RESET_N if VCC > 3.1 V
Vin_usb
DC current trough any digital I/O
pin (except supplies)
Ipin
VCC_RF output current
ICC_RF
Input power at RF_IN
Prfin
Antenna bias voltage
V_ANT
6
V
Antenna bias current
I_ANT
100
mA
Storage temperature
Tstg
85
°C
source impedance = 50 Ω,
continuous wave
–40
Table 8: Absolute maximum ratings
⚠
Stressing the device beyond the “Absolute Maximum Ratings” may cause permanent damage.
These are stress ratings only. The product is not protected against overvoltage or reversed
voltages. If necessary, voltage spikes exceeding the power supply voltage specification, given in
table above, must be limited to values within the specified boundaries by using appropriate
protection diodes.
4.2 Operating conditions
☞
All specifications are at an ambient temperature of 25°C. Extreme operating temperatures can
significantly impact specification values. Applications operating near the temperature limits
should be tested to ensure the specification.
Parameter
Symbol
Min
Typical
Max
Units Condition
Power supply voltage
VCC
2.7
3.0
3.6
V
Supply voltage USB
VDD_USB
3.0
3.3
3.6
V
Backup battery voltage
V_BCKP
1.4
3.6
V
Backup battery current
I_BCKP
Input pin voltage range
Vin
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15
0
Electrical specification
µA
VCC
V_BCKP = 1.8 V,
VCC = 0 V
V
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LEA-M8S - Data Sheet
Parameter
Symbol
Min
Typical
Max
Digital IO Pin Low level input voltage
Vil
0
0.2*VCC
V
Digital IO Pin High level input voltage
Vih
0.7*VCC
VCC
V
Digital IO Pin Low level output voltage
Vol
0.4
V
Iol = 4mA
Digital IO Pin High level output voltage
Voh
V
Ioh = 4mA
VCC–0.4
Pull-up resistor for RESET_N (internal)
Rpu
USB_DM, USB_DP
VinU
Compatible with USB with 27 Ω series resistance
V_ANT antenna bias voltage
V_ANT
2.7
Antenna bias voltage drop
V_ANT_DROP
VCC_RF voltage
VCC_RF
VCC_RF output current
11
Units Condition
5.5
V
IANT < –50 mA
0.1
V
ICC_RF = 50 mA
VCC–0.1
V
ICC_RF
Receiver Chain Noise Figure
10
Operating temperature
kΩ
50
NFtot
mA
4.0
Topr
–40
dB
85
°C
Table 9: Operating conditions
☞
Operation beyond the specified operating conditions can affect device reliability.
4.3 Indicative current requirements
Table 10 lists examples of the total system supply current for a possible application.
☞
Values in Table 10 are provided for customer information only as an example of typical power
requirements. Values are characterized on samples, actual power requirements can vary
depending on FW version used, external circuitry, number of SVs tracked, signal strength, type of
start as well as time, duration and conditions of test.
Parameter
Symbol
Max. supply current 11
Average supply current
Typ
Typ
GPS & GLONASS / QZSS / SBAS
GPS / QZSS / SBAS
Iccp
12, 13
Icc Acquisition
14
Icc Tracking
Max
Units Condition
67
mA
24
18
mA
Estimated at 3 V
22
17
mA
Estimated at 3 V
6.2
5.7
mA
Estimated at 3 V
(Continuous mode)
Icc Tracking
(Power Save mode / 1 Hz)
Table 10: Indicative power requirements at 3.0 V
☞
For more power requirement information, see LEA-M8S / M8T Hardware Integration Manual [1].
☞
For more information on how to noticeably reduce current consumption, see the Power
Management Application Note [4].
10
Only valid for the GPS band
Use this figure to dimension maximum current capability of power supply. Measurement of this parameter with 1 Hz
bandwidth.
12
Use this figure to determine required battery capacity.
13
Simulated GNSS constellation using power levels of -130 dBm. VCC = 3.0 V
14
Average current from start-up until the first fix.
11
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5
Mechanical specifications
Figure 3: Dimensions
☞
For information about the paste mask and footprint, see the LEA-M8S / M8T Hardware
Integration Manual [1].
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6
Reliability tests and approvals
6.1 Reliability tests
☞
LEA-M8S modules are based on AEC-Q100 qualified GNSS chips.
Tests for product family qualifications are according to ISO 16750 “Road vehicles – environmental
conditions and testing for electrical and electronic equipment”, and appropriate standards.
6.2 Approvals
The LEA-M8S module complies with the Directives 2011/65/EU and
2015/863/EU of the European Parliament and the Council on the Restriction of
Use of certain Hazardous Substances (RoHS).
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7
Product handling & soldering
7.1 Packaging
The LEA-M8S GNSS modules are delivered as hermetically sealed, reeled tapes in order to enable
efficient production, production lot set-up and tear-down. For more information see the u-blox
Package Information Guide [3].
7.1.1
Reels
The LEA-M8S GNSS modules are deliverable in quantities of 250 pcs on a reel. The LEA-M8S receivers
are shipped on Reel Type B, as specified in the u-blox Package Information Guide [3].
7.1.2
Tapes
The dimensions and orientations of the tapes for LEA-M8S modules are specified in Figure 4.
Pin 1
Sprocket Hole
Feed direction
Figure 4: Dimensions and orientation for LEA-M8S modules on tape
7.2 Shipment, storage and handling
For important information regarding shipment, storage and handling see the u-blox Package
Information Guide [3].
7.2.1
Moisture Sensitivity Levels
The Moisture Sensitivity Level (MSL) relates to the packaging and handling precautions required. The
LEA-M8S modules are rated at MSL level 4.
☞
For MSL standard see IPC/JEDEC J-STD-020, which can be downloaded from www.jedec.org.
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LEA-M8S - Data Sheet
☞
For more information regarding MSL see the u-blox Package Information Guide [3].
7.2.2
Reflow soldering
Reflow profiles are to be selected according u-blox recommendations (see the LEA-M8S / LEA-M8T
Hardware Integration Manual [1]).
7.2.3
ESD handling precautions
⚠
LEA-M8S module is Electrostatic Sensitive Devices (ESD). Observe precautions for handling!
Failure to observe these precautions can result in severe damage to the GNSS receiver!
⚠
GNSS receivers are Electrostatic Sensitive Devices (ESD) and require special precautions when
handling. Particular care must be exercised when handling patch antennas, due to the risk of
electrostatic charges. In addition to standard ESD safety practices, the following measures should
be taken into account whenever handling the receiver:
•
•
•
•
•
Unless there is a galvanic coupling between
the local GND (i.e. the work table) and the
PCB GND, then the first point of contact
when handling the PCB must always be
between the local GND and PCB GND.
Before mounting an antenna patch, connect
ground of the device
When handling the RF pin, do not come into
contact with any charged capacitors and be
careful when contacting materials that can
develop charges (e.g. patch antenna ~10 pF,
coax cable ~50-80 pF/m, soldering iron, …)
To prevent electrostatic discharge through
the RF input, do not touch any exposed
antenna area. If there is any risk that such
exposed antenna area is touched in non ESD
protected work area, implement proper ESD
protection measures in the design.
When soldering RF connectors and patch
antennas to the receiver’s RF pin, make sure
to use an ESD safe soldering iron (tip).
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8
Default messages
Interface
Settings
UART Output
9600 Baud, 8 bits, no parity bit, 1 stop bit
Configured to transmit both NMEA and UBX protocols, but only the following NMEA (and no
UBX) messages have been activated at start-up:
GGA, GLL, GSA, GSV, RMC, VTG, TXT
USB Output
Configured to transmit both NMEA and UBX protocols, but only the following NMEA (and no
UBX) messages have been activated at start-up:
GGA, GLL, GSA, GSV, RMC, VTG, TXT
USB Power Mode: Bus Powered
UART Input
9600 Baud, 8 bits, no parity bit, 1 stop bit, Autobauding disabled
Automatically accepts following protocols without need of explicit configuration:
UBX, NMEA, RTCM
The GNSS receiver supports interleaved UBX and NMEA messages.
USB Input
Automatically accepts following protocols without need of explicit configuration:
UBX, NMEA
The GPS receiver supports interleaved UBX and NMEA messages.
USB Power Mode: Bus Powered
DDC
Fully compatible with the I2C industry standard, available for communication with an external
host CPU or u-blox cellular modules, operated in slave mode only. Default messages activated.
NMEA and UBX are enabled as input messages, only NMEA as output messages.
Maximum bit rate 400 kb/s.
TIMEPULSE
(1 Hz Nav)
1 pulse per second, synchronized at rising edge, pulse length 100 ms.
Table 11: Default messages
☞
Refer to the u-blox 8 / u-blox M8 Receiver Description including Protocol Specification [2] for
information about further settings.
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9
Labeling and ordering information
9.1 Product labeling
The labeling of u-blox M8 GNSS modules includes important product information. The location of the
LEA-M8S product type number is shown in Figure 5.
Product Type Number
PPP-TGV-T-XX
Pin 1 Marking
Figure 5: Location of product type number on u-blox LEA-M8S module label
9.2 Explanation of codes
Three different product code formats are used. The Product Name is used in documentation such as
this data sheet and identifies all u-blox M8 products, independent of packaging and quality grade. The
Ordering Code includes options and quality, while the Type Number includes the hardware and
firmware versions. Table 12 shows the structure of these three different formats.
Format
Structure
Product Name
PPP-TGV
Ordering Code
PPP-TGV-T
Type Number
PPP-TGV-T-XX
Table 12: Product Code Formats
The parts of the product code are explained in Table 13.
Code
Meaning
Example
PPP
Product Family
LEA
TG
Platform
M8 = u-blox M8
V
Variant
Function set (A-Z), T = Timing, R = DR, etc.
T
Option / Quality Grade Describes standardized functional element or quality grade
0 = Default variant, A = Automotive
XX
Product Detail
Describes product details or options such as hard- and software revision, cable length,
etc.
Table 13: part identification code
9.3 Ordering codes
Ordering No.
Product
LEA-M8S-0
u-blox M8 Concurrent GNSS LCC Module, TCXO, ROM, SAW, 17.0x22.4 mm, 250 pcs/reel
Table 14: Product ordering codes for professional grade module
☞
Product changes affecting form, fit or function are documented by u-blox. For a list of Product
Change Notifications (PCNs) see our website.
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Appendix
A Glossary
Abbreviation
Definition
ASCII
American Standard Code for Information Interchange
ARM
Arm (Advanced RISC Machines) Holdings
AEC
Automotive Electronics Council
BBR
Battery Backed RAM
BER
Bit Error Rate
CPU
Central Processing Unit
UTC
Coordinated Universal Time
DCE
Data Circuit-terminating Equipment* / Data Communication Equipment*
DTE
Data Terminal Equipment
DC
Direct Current
DRX
Discontinuous Reception
DDC
Display Data Channel
DL
Down Link (Reception)
XYZ
This table can be automatically constructed using the custom macro.
Table 15: Explanation of the abbreviations and terms used
Some text to describe whatever it is that is relevant here.
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Appendix
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LEA-M8S - Data Sheet
Related documents
[1]
[2]
LEA-M8S / M8T Hardware Integration Manual, Doc. No. UBX-15030060
u-blox 8 / u-blox M8 Receiver Description including Protocol Specification (Public version), Doc.
No. UBX-13003221
u-blox Package Information Guide, Doc. No. UBX-14001652
Power Management Application Note, Doc. No. UBX-13005162
Radio Resource LCS Protocol (RRLP), (3GPP TS 44.031 version 11.0.0 Release 11)
[3]
[4]
[5]
☞
For regular updates to u-blox documentation and to receive product change notifications, register
on our homepage (www.u-blox.com).
Revision history
Revision
Date
Name
Comments
R01
20-Jun-2016
byou
Advance Information
R02
05-Aug-2016
byou
Production Information
R03
28-Jan-2019
rmak
Updated Sections 1.6.3 (AssistNow autonomous), 4.1 (Absolute maximum
rating), 6.2 (RoHS statement)
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Page 27 of 28
LEA-M8S - Data Sheet
Contact
For complete contact information, visit us at www.u-blox.com.
u-blox Offices
North, Central and South America
u-blox America, Inc.
Phone:
E-mail:
+1 703 483 3180
info_us@u-blox.com
Regional Office West Coast:
Phone:
E-mail:
+1 408 573 3640
info_us@u-blox.com
Headquarters
Europe, Middle East, Africa
Asia, Australia, Pacific
u-blox AG
Phone: +65 6734 3811
E-mail: info_ap@u-blox.com
Support: support_ap@u-blox.com
Phone: +41 44 722 74 44
E-mail: info@u-blox.com
Support: support@u-blox.com
Regional Office Australia:
Phone: +61 2 8448 2016
E-mail: info_anz@u-blox.com
Support: support_ap@u-blox.com
Technical Support:
Phone:
E-mail:
u-blox Singapore Pte. Ltd.
+1 703 483 3185
support@u-blox.com
Regional Office China (Beijing):
Phone: +86 10 68 133 545
E-mail: info_cn@u-blox.com
Support: support_cn@u-blox.com
Regional Office China (Chongqing):
Phone: +86 23 6815 1588
E-mail: info_cn@u-blox.com
Support: support_cn@u-blox.com
Regional Office China (Shanghai):
Phone: +86 21 6090 4832
E-mail: info_cn@u-blox.com
Support: support_cn@u-blox.com
Regional Office China (Shenzhen):
Phone: +86 755 8627 1083
E-mail: info_cn@u-blox.com
Support: support_cn@u-blox.com
Regional Office India:
Phone: +91 80 405 092 00
E-mail: info_in@u-blox.com
Support: support_in@u-blox.com
Regional Office Japan (Osaka):
Phone: +81 6 6941 3660
E-mail: info_jp@u-blox.com
Support: support_jp@u-blox.com
Regional Office Japan (Tokyo):
Phone: +81 3 5775 3850
E-mail: info_jp@u-blox.com
Support: support_jp@u-blox.com
Regional Office Korea:
Phone: +82 2 542 0861
E-mail: info_kr@u-blox.com
Support: support_kr@u-blox.com
Regional Office Taiwan:
Phone: +886 2 2657 1090
E-mail: info_tw@u-blox.com
Support: support_tw@u-blox.com
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Contact
Page 28 of 28
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