MAX-M8 series
u-blox M8 concurrent GNSS modules
Data Sheet
Abstract
Technical data sheet describing the MAX-M8 module series, which provides concurrent reception of
up to 3 GNSS (GPS, Galileo, GLONASS, BeiDou) in a 9.7 x 10.1 mm package. It is pin-compatible to
MAX-7 and MAX-6 modules.
www.u-blox.com
UBX-15031506 - R04
MAX-M8 series - Data Sheet
Document Information
Title
MAX-M8 series
Subtitle
u-blox M8 concurrent GNSS modules
Document type
Data Sheet
Document number
UBX-15031506
Revision and date
R05
Document status
Production Information
27-May-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
MAX-M8C
MAX-M8C-0-10
ROM SPG 3.01
UBX-16013125
MAX-M8Q
MAX-M8Q-0-10
ROM SPG 3.01
UBX-16013125
MAX-M8W
MAX-M8W-0-10
ROM SPG 3.01
UBX-16013125
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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MAX-M8 series - Data Sheet
Contents
Document Information ................................................................................................................................ 2
Contents .......................................................................................................................................................... 3
1
Description ............................................................................................................................................... 5
1.1 Overview ........................................................................................................................................................ 5
1.2 Product features ......................................................................................................................................... 6
1.3 GNSS performance ..................................................................................................................................... 7
1.4 Block diagram .............................................................................................................................................. 8
1.5 Supported GNSS constellations .............................................................................................................. 8
1.5.1
GPS ........................................................................................................................................................ 8
1.5.2
GLONASS ............................................................................................................................................. 9
1.5.3
BeiDou ................................................................................................................................................... 9
1.5.4
Galileo .................................................................................................................................................... 9
1.6 Assisted GNSS (A-GNSS) .......................................................................................................................... 9
1.6.1
AssistNowTM Online ............................................................................................................................ 9
1.6.2
AssistNowTM Offline .........................................................................................................................10
1.6.3
AssistNowTM Autonomous .............................................................................................................10
1.7 Augmentation Systems ..........................................................................................................................10
1.7.1
Satellite-Based Augmentation System (SBAS) .........................................................................10
1.7.2
QZSS ...................................................................................................................................................10
1.7.3
IMES ....................................................................................................................................................11
1.7.4
Differential GPS (D-GPS) .................................................................................................................11
1.8 Odometer ....................................................................................................................................................11
1.9 Geofencing..................................................................................................................................................11
1.10 Message Integrity Protection .................................................................................................................11
1.11 Spoofing detection ...................................................................................................................................12
1.12 Broadcast navigation data ......................................................................................................................12
1.13 EXTINT: External interrupt......................................................................................................................12
1.13.1 Pin control ..........................................................................................................................................12
1.13.2 Aiding ..................................................................................................................................................12
1.14 TIMEPULSE ................................................................................................................................................12
1.15 Protocols and interfaces .........................................................................................................................13
1.16 Interfaces ....................................................................................................................................................13
1.16.1 UART ...................................................................................................................................................13
1.16.2 Display Data Channel (DDC) ...........................................................................................................13
1.17 Clock generation........................................................................................................................................13
1.17.1 Oscillators ..........................................................................................................................................13
1.17.2 Real-Time Clock (RTC) .....................................................................................................................13
1.18 Power management .................................................................................................................................14
1.18.1 DC-DC converter ...............................................................................................................................14
1.18.2 Power Mode Setup............................................................................................................................14
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1.19 Antenna .......................................................................................................................................................15
1.19.1 Active antenna control (LNA_EN) .................................................................................................15
1.19.2 Antenna supervisor and short circuit detection ........................................................................15
1.20 Configuration management ...................................................................................................................15
2
Pin definition ........................................................................................................................................ 16
2.1 Pin assignment ..........................................................................................................................................16
2.2 Pin name changes .....................................................................................................................................17
3
Electrical specification ..................................................................................................................... 18
3.1 Absolute maximum rating.......................................................................................................................18
3.2 Operating conditions ................................................................................................................................18
3.3 Indicative current requirements ............................................................................................................20
4
Mechanical specifications ............................................................................................................... 21
5
Reliability tests and approvals....................................................................................................... 22
5.1 Reliability tests ..........................................................................................................................................22
5.2 Approvals ....................................................................................................................................................22
6
Product handling & soldering.......................................................................................................... 23
6.1 Packaging ...................................................................................................................................................23
6.1.1
Reels ....................................................................................................................................................23
6.1.2
Tapes ...................................................................................................................................................23
6.2 Shipment, storage and handling ...........................................................................................................24
6.2.1
Moisture Sensitivity Levels ............................................................................................................24
6.2.2
Reflow soldering ................................................................................................................................24
6.2.3
ESD handling precautions ..............................................................................................................24
7
Default messages ............................................................................................................................... 26
8
Labeling and ordering information ............................................................................................... 27
8.1 Product labeling.........................................................................................................................................27
8.2 Explanation of codes ................................................................................................................................27
8.3 Ordering codes ...........................................................................................................................................27
Appendix ....................................................................................................................................................... 28
A
Glossary ................................................................................................................................................. 28
Related documents ................................................................................................................................... 29
Revision history .......................................................................................................................................... 29
Contact .......................................................................................................................................................... 30
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MAX-M8 series - Data Sheet
1 Description
1.1 Overview
The MAX-M8 series of concurrent GNSS modules are built on the high performing u-blox M8 GNSS
engine in the industry proven MAX form factor.
The modules can concurrently receive up to three GNSS systems (GPS/Galileo) together with BeiDou
or GLONASS). The MAX-M8 modules recognize multiple constellations simultaneously and provide
outstanding positioning accuracy in scenarios with urban canyon or weak signals. The modules offer
high performance even at low power consumption levels. For even better and faster positioning
improvement, the MAX-M8 modules support augmentation of QZSS and IMES together with WAAS,
EGNOS, MSAS, and GAGAN.
The MAX-M8 modules support message integrity protection, Geofencing, and spoofing detection
with configurable interface settings to easily fit to customer applications. The MAX form factor allows
easy migration from previous MAX generations.
u-blox MAX-M8 modules use GNSS chips qualified according to AEC-Q100, are manufactured in
ISO/TS 16949 certified sites, and fully tested on a system level. Qualification tests are performed as
stipulated in the ISO16750 standard: “Road vehicles – Environmental conditions and testing for
electrical and electronic equipment”.
MAX-M8 modules are available in three product variants:
•
•
•
MAX-M8C is optimized for cost sensitive applications and has the lowest power consumption.
MAX-M8Q provides best performance for passive and active antennas designs. It is also halogen
free (green) which makes it perfectly suited for consumer applications.
MAX-M8W provides best performance and is optimized for active antennas.
The modules combine a high level of integration capability with flexible connectivity options in a
miniature package. This makes it perfectly suited for industrial applications with strict size and cost
requirements. The I2C compatible DDC interface provides connectivity and enables synergies with
most u-blox cellular modules.
The u-blox MAX-M8 modules 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 MAX-M8 related AssistNow Assistance.
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GLONASS
Number of concurrent
GNSS
1.65 V – 3.6 V
MAX-M8C
●
●
● ● ●
3
●
MAX-M8Q
●
●
● ● ●
MAX-M8W ●
●
● ● ●
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♦ = Yes, but with a higher backup content
Oscillator
●
●
♦
C
1
●
3
● ●
●
● T
1
●
3
● ●
●
● T
1
●
Contents
●
Automotive
Professional
Features
Standard
Built-in antenna supply and
supervisor
Timepulse
Built-in antenna
Additional LNA
Additional SAW
Data logging
Supply Interfaces
Programmable (flash)
DDC (I2C compliant)
SPI
USB
UART
GNSS
2.7 V – 3.6 V
RTC crystal
BeiDou
Category
Galileo
Timing
Dead Reckoning
Model
High Precision GNSS
GPS / QZSS
Standard Precision GNSS
MAX-M8 series - Data Sheet
1.2 Product features
Grade
C = Crystal / T = TCXO
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MAX-M8 series - Data Sheet
1.3 GNSS 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
Velocity accuracy 1
Heading accuracy
0.05 m/s
1
0.3 degrees
Accuracy of time pulse signal
RMS
99%
Frequency of time pulse signal
Operational limits
2
MAX-M8Q/W
0.25 Hz…10 MHz (configurable)
Dynamics
≤4g
Altitude
50,000 m
Velocity
500 m/s
GNSS
Horizontal position accuracy 3
Max navigation update rate
Time-To-First-Fix
6
Sensitivity 8
30 ns
60 ns
5
Cold start
GPS &
GLONASS
GPS
GLONASS
BEIDOU
GALILEO
2.5 m
2.5 m
4m
3m
TBC 4
10 Hz
18 Hz
18 Hz
18 Hz
18 Hz
26 s
29 s
30 s
34 s
45 s
Hot start
1s
1s
1s
1s
1s
Aided starts 7
2s
2s
2s
3s
7s
Tracking &
Navigation
–167 dBm
–166 dBm
–166 dBm
–160dBm
–159dBm
Reacquisition
–160 dBm
–160 dBm
–156 dBm
–157dBm
–153dBm
Cold start
–148 dBm
–148 dBm
–145 dBm
–143dBm
–138dBm
Hot start
–157 dBm
–157 dBm
–156 dBm
–155dBm
–151dBm
MAX-M8C
GNSS
GPS &
GLONASS
GPS
GLONASS
BEIDOU
GALILEO
Time-To-First-Fix 6
Cold start
26 s
30 s
31 s
39 s
57 s
Sensitivity 8
Hot start
1s
1s
1s
1s
1s
Aided starts 7
3s
3s
3s
7s
7s
Tracking &
Navigation
–164 dBm
–164 dBm
–163 dBm
–160 dBm
–154 dBm
Reacquisition
–160 dBm
–159 dBm
–156 dBm
–155 dBm
–152 dBm
Cold start
–148 dBm
–147 dBm
–145 dBm
–143 dBm
–133 dBm
Hot start
–157 dBm
–156 dBm
–155 dBm
–155 dBm
–151 dBm
Table 1: MAX-M8 indicative performance in different GNSS modes (default: concurrent reception of GPS & GLONASS
including QZSS, SBAS)
1
2
3
4
5
6
7
8
50% @ 30 m/s
Assuming Airborne < 4 g platform
CEP, 50%, 24 hours static, -130 dBm, > 6 SVs
To be confirmed when Galileo reaches full operational capability
Rates with SBAS and QZSS enabled for > 98% fix report rate under typical conditions
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: MAX-M8 block diagram
1.5 Supported GNSS constellations
The MAX-M8 GNSS modules are concurrent GNSS receivers that 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. QZSS, IMES and SBAS, GAGAN augmentation systems share the same
frequency band as GPS and can always be processed in conjunction with GPS.
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 MAX-M8 positioning modules are designed to receive and track the L1C/A signals provided at
1575.42 MHz by the Global Positioning System (GPS). The MAX-M8 series can receive and process
GPS concurrently with GLONASS or BeiDou.
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1.5.2
GLONASS
The MAX-M8 modules can receive and process GLONASS concurrently with GPS or BeiDou. The
Russian GLONASS satellite system is an alternative system to the US-based Global Positioning
System (GPS). u-blox MAX-M8 positioning modules are designed to receive and track the L1OF
signals GLONASS provided 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 u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification [2]
for u-blox design recommendations.
1.5.3
BeiDou
The MAX-M8 modules can receive and process the B1I signals broadcast at 1561.098 MHz from the
BeiDou Navigation Satellite System. The ability to receive and track BeiDou signals in conjunction with
another constellation results in higher coverage, improved reliability and better accuracy. Currently,
BeiDou is not fully operational globally and provides Chinese regional coverage only. Global coverage
is scheduled for 2020.
1.5.4
Galileo
The MAX-M8 positioning modules 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 last position and time, will reduce
the time to first fix significantly and improve the acquisition sensitivity. All u-blox M8030 based
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 GNSS device downloads assistance data from the ublox AssistNow Online Service at system start-up. AssistNow Online is network operator independent
and globally available. u-blox only sends ephemeris data for those satellites currently visible to the
device requesting the data, thus minimizing the amount of data transferred.
Supply of aiding information, such as ephemeris, almanac, rough last position and time, will reduce
the time to first fix significantly and improve the 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 AssistNow Offline, users download u-blox’s long-term orbit data from the Internet at their
convenience. The orbit data must be stored in the memory of the application processor. Thus the
service requires no connectivity at system start-up and enables 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 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 satellites; by capturing strategic ephemeris data
at specific times of the day, the receiver can predict accurate satellite ephemeris for up to 3 days after
initial reception.
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.
☞
u-blox M8 ROM-based receivers, such as the MAX-M8 series, can use AssistNow Autonomous to
calculate GPS only orbit predictions for up to 3 days. For best AssistNow Autonomous
performance, it is recommended to use u-blox M8 flash-based receivers.
☞
For more details see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification
[2].
1.7 Augmentation Systems
1.7.1
Satellite-Based Augmentation System (SBAS)
u-blox M8 positioning modules support SBAS. These systems supplement GPS data with additional
regional or wide area GPS augmentation data. The system broadcasts augmentation data via satellite
and this information can be used by GNSS receivers to improve the resulting precision. SBAS
satellites can be used as additional satellites for ranging (navigation), further enhancing precision and
availability. The following SBAS types are supported with u-blox M8: 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 L1C/A signals for the Pacific region covering Japan and Australia. MAX-M8 positioning
modules are 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.
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☞
The L1- SAIF signal provided by QZSS can be enabled for reception via a GNSS configuration
message.
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. MAX-M8 modules 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.
☞
IMES reception is disabled by default
1.7.4
Differential GPS (D-GPS)
u-blox M8 receivers support 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
[5].
☞
RTCM corrections cannot be used together with SBAS.
1.8 Odometer
The odometer provides information on travelled ground distance (in meter) using solely the position
and Doppler-based velocity of 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].
1.9 Geofencing
The u-blox MAX-M8 modules support up to four circular Geofencing areas defined on the Earth’s
surface using a 2D model. Geofencing is active when at least one Geofence is defined, the current
status can be found by polling the receiver.
1.10 Message Integrity Protection
The MAX-M8 modules provide a function to prevent a third party interfering with the UBX message
steam sent from receiver to host. The security mechanism essentially ‘signs’ nominated messages
with a following message containing an md5 generated hash of the nominated message. This
message signature is then compared with one generated by the host to determine if the message
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MAX-M8 series - Data Sheet
data has been altered. The hash algorithm seed can use one fixed secret ID-key set by eFuse in
production or a dynamic ID-key set by host enabling users to detect ‘Man-in-the-middle’ style attacks.
1.11 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 MAX-M8 modules include anti-spoofing 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 detection of all spoofing attacks
1.12 Broadcast navigation data
The MAX-M8 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)
[6]. For more details, see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification
[2].
1.13 EXTINT: External interrupt
EXTINT is an external interrupt pin with fixed input voltage thresholds with respect to VCC_IO. It can
be used for control of the receiver or for aiding.
For more information on how to implement and configure these features see the u-blox 8 / u-blox M8
Receiver Description including Protocol Specification [2] and the MAX-8 / MAX-M8 Hardware
Integration Manual [1].
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 EXTINT pin. The receiver can also be turned off and
sent into Backup Mode using EXTINT when Power Save Mode is not active.
1.13.2 Aiding
The EXTINT pin 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 the EXTINT pin.
Frequency aiding can be implemented by connecting a periodic rectangular signal with a frequency up
to 500 kHz and arbitrary duty cycle (low/high phase duration must not be shorter than 50 ns) to the
EXTINT pin, and providing the applied frequency value to the receiver using UBX messages.
1.14 TIMEPULSE
A configurable time pulse signal is available with all u-blox M8 modules.
The TIMEPULSE output generates pulse trains synchronized with a GNSS 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.
By default the time pulse signal is configured to 1 pulse per second. For more information, see the
u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification [2].
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MAX-M8 series - Data Sheet
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
Input, message 1, 2, 3, 9
Table 4: Available protocols
All protocols are available on UART 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
MAX-M8 modules include 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,
updates and reconfiguration.
1.16.2 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 the 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 while
serving interrupts, so real bit rates may be slightly lower.
1.17 Clock generation
1.17.1 Oscillators
MAX-M8 concurrent GNSS modules are available in Crystal and TCXO versions. The TCXO option
allows accelerated weak signal acquisition, enabling faster start and reacquisition times.
1.17.2 Real-Time Clock (RTC)
The RTC is driven by a 32 kHz oscillator, which makes use of an 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.
With MAX-M8C in Hardware Backup Mode, the main oscillator is used as timing reference instead of
the 32 kHz oscillator. The MAX-M8C applies single crystal mode, where the 26 MHz crystal oscillator
can also be used to provide a frequency reference to the RTC without using an additional crystal for
the RTC. This makes MAX-M8C a more cost efficient solution at the expense of a higher backup
current.
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☞
For more information, see the MAX-8 / MAX-M8 Hardware Integration Manual [1].
1.18 Power management
u-blox M8 technology 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. In addition, a high efficiency DC/DC converter is integrated to allow
low power consumption even for higher main supply voltages.
1.18.1 DC-DC converter
MAX-M8Q and MAX-M8C modules integrate a DC-DC converter, allowing reduced power consumption
by up to 50%.
☞
For more information, see the MAX-8 / MAX-M8 Hardware Integration Manual [1].
1.18.2 Power Mode Setup
u-blox M8 modules can be configured to run in either continuous 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.
•
•
•
•
Continuous (default) mode for best GNSS performance vs power consumption
A 1 Hz cyclic tracking mode for aggressive power reduction
Choice of 2 or 4 Hz 9 cyclic tracking modes for typical wearable applications
ON/OFF interval mode
1.18.2.1 Continuous Mode
Continuous Mode uses the acquisition engine at full performance, resulting in the shortest possible
TTFF and the highest sensitivity. The receiver searches for all possible satellites until the almanac is
completely downloaded. The receiver then switches to the tracking engine to lower the power
consumption.
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
1.18.2.2 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 options
can be set by using a specific UBX message.
☞
9
For more information about power management strategies, see the u-blox 8 / u-blox M8 Receiver
Description Including Protocol Specification [2].
Single GNSS constellation configuration only
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1.19 Antenna
MAX-M8 modules are designed for use with passive 10 and active 11 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 all MAX-M8 modules
1.19.1 Active antenna control (LNA_EN)
The LNA_EN Pin can be used to turn on and off an external LNA or an active antenna. This reduces
power consumption in Power Save Mode (Backup mode). This pin is available only on MAX-M8C and
MAX-M8Q.
1.19.2 Antenna supervisor and short circuit detection
An antenna supervisor is available with MAX-M8W. The antenna supervisor enables the receiver to
detect short circuits (ANT_OK) 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.
☞
Antenna open circuit detection (ANT_DET) can be mapped to PIO13 and requires external
components
☞
For more information, see the MAX-8 / MAX-M8 Hardware Integration Manual [1].
1.20 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.
☞
10
11
For more information about configuration management, see the u-blox 8 / u-blox M8 Receiver
Description Including Protocol Specification [2].
For integration MAX-M8 modules with Cellular products, see the MAX-8 / MAX-M8 Hardware Integration Manual [1].
For information on using active antennas with MAX-M8 modules, see the MAX-8 / MAX-M8 Hardware Integration Manual [1].
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2 Pin definition
2.1 Pin assignment
Figure 2: Pin assignment
No
Module
Name
PIO 12 No.
1
All
GND
-
2
All
TXD
6
O
Serial Port
3
All
RXD
7
I
Serial Port
4
All
TIMEPULSE
11
O
Time pulse (1PPS)
5
All
EXTINT
13
I
External Interrupt Pin
6
All
V_BCKP
-
Backup voltage supply
7
All
VCC_IO
-
IO Supply Voltage
8
All
VCC
-
Supply voltage
9
All
RESET_N
-
10
All
GND
-
11
All
RF_IN
-
12
All
GND
-
13
14
15
I/O
Description
Ground
I
RESET_N
Ground
I
GNSS signal input
Ground
MAX-M8C/Q
LNA_EN
16
O
Antenna control
MAX-M8W
Reserved
-
-
Reserved
All
VCC_RF
-
Output Voltage RF section
MAX-M8W
V_ANT
-
MAX-M8C/Q
Reserved
-
-
Reserved
Active Antenna Supply Voltage
16
All
SDA
9
I/O
DDC Data
17
All
SCL
8
I/O
DDC Clock
18
All
SAFEBOOT_N
-
I
SAFEBOOT_N (for reconfiguration, leave OPEN)
Table 6: Pinout
☞
12
Antenna open circuit detection (ANT_DET) can be mapped to PIO13 and requires external
components. MAX-M8W does not have a dedicated ANT_DET pin. The ANT_DET pin can be made
available on the EXTINT pin. For more information, see the MAX-8 / MAX-M8 Hardware Integration
Manual [1].
Peripheral Input Output
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☞
Pins designated as “Reserved” should not be used. For more information about pinouts, see the
MAX-8 / MAX-M8 Hardware Integration Manual [1].
2.2 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
13
ANT_ON
LNA_EN
5
EXTINT0
EXTINT
18
Reserved
SAFEBOOT_N
Table 7: Pin name change list
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3 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 MAX-8 / MAX-M8 Hardware Integration Manual [1].
3.1 Absolute maximum rating
Parameter
Symbol
Module
Power supply voltage
VCC,
VCC_IO
Backup battery voltage
Input pin voltage
Condition
Min
Max
Units
All
–0.5
3.6
V
V_BCKP
All
–0.5
3.6
V
Vin
All
If VCC_IO < 3.1V
–0.5
VCC_IO+0.5
V
If VCC_IO > 3.1V
-0.5
3.6
V
10
mA
100
mA
15
dBm
DC current trough any digital I/O pin
(except supplies)
Ipin
VCC_RF output current
ICC_RF
All
Input power at RF_IN
Prfin
All
Antenna bias voltage
V_ANT
6
V
Antenna bias current
I_ANT
100
mA
Storage temperature
Tstg
105
85
°C
°C
MAX-M8C
MAX-M8Q/M8W
source impedance
= 50 Ω, continuous
wave
–40
–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.
3.2 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.
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Parameter
Symbol
Module
Min
Typ
Max
Units Condition
Power supply voltage
VCC, VCC_IO
MAX-M8C
1.65
3.0
3.6
V
MAX-M8Q/W
2.7
3.0
3.6
V
1.4
3.6
V
Backup battery voltage
V_BCKP
All
Backup battery current
I_BCKP
MAX-M8Q/W
15
µA
V_BCKP = 3.0 V,
VCC = 0 V
MAX-M8C
100
µA
V_BCKP = 3.0 V,
VCC = 0 V
MAX-M8Q/W
30
µA
VCC = 3.0 V
MAX-M8C
105
µA
VCC = 3.0 V
SW backup current
I_SWBCKP
Input pin voltage range 13
Vin
All
0
VCC_IO+0.5
V
Digital IO Pin Low level input
voltage
Vil
All
0
0.2*VCC_IO
V
Digital IO Pin High level input
voltage
Vih
All
0.7*VCC
_IO
VCC_IO+0.5
V
Digital IO Pin Low level output
voltage
Vol
All
0.4
V
Iol=4 mA
Digital IO Pin High level output
voltage
Voh
All
V
Ioh=4 mA
Pull-up resistor for RESET_N
(Internal)
Rpu
All
V_ANT antenna bias voltage
V_ANT
2.7
Antenna bias voltage drop
V_ANT_DROP
VCC_RF voltage
VCC_RF
All
ICC_RF
All
NFtot
All
Topr
All
VCC_RF output current
Receiver Chain Noise Figure
14
Operating temperature
VCC_IO 0.4
11
k
5.5
0.1
VCC - 0.1
IANT < –50 mA
V
ICC_RF =50 mA
V
50
3.5
–40
V
mA
dB
85
°C
Table 9: Operating conditions
☞
13
14
Operation beyond the specified operating conditions can affect device reliability.
If VCC or VCC_IO is 0V there should not be any voltage applied to any I/O (Including RESET_N)
Only valid for the GPS band
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3.3 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, the number of SVs tracked, signal strength, type
of start as well as time, duration and conditions of test.
Parameter
Symbol
Module
Max. supply current 15 Iccp
Average supply
current 16, 17
Typical
Typical
Max
GPS / GLONASS GPS / QZSS /
/ QZSS / SBAS
SBAS
All
18
67
mA
Estimated at 3 V
26
20
mA
Estimated at 3 V
MAX-M8W 43
32
mA
Estimated at 3 V
MAX-M8Q
26
20
mA
Estimated at 3 V
Icc Tracking
(Continuous mode)
MAX-M8C
23
17
mA
Estimated at 3 V
MAX-M8W 38
30
mA
Estimated at 3 V
MAX-M8Q
23
18
mA
Estimated at 3 V
Icc Tracking
(Power Save mode /
1 Hz)
MAX-M8C
5.4
4.9
mA
Estimated at 3 V
MAX-M8W 9.7
8.9
mA
Estimated at 3 V
MAX-M8Q
5.7
mA
Estimated at 3 V
Icc Acquisition
MAX-M8C
Units Condition
6.2
Table 10: MAX-M8C/W/Q indicative power requirements at 3.0 V
☞
For more information about power requirements, see the MAX-8 / MAX-M8 Hardware Integration
Manual [1].
☞
For more information on how to noticeably reduce current consumption, see the Power
Management Application Note [3].
15
Use this figure to dimension maximum current capability of power supply. Measure this parameter with 1 Hz bandwidth.
Use this figure to determine required battery capacity.
17
Simulated GNSS constellation using power levels of -130 dBm. VCC= 3.0 V
18
Average current from start-up until the first fix.
16
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4 Mechanical specifications
Figure 3: Dimensions
☞
For information about the paste mask and footprint, see the MAX-8 / MAX-M8 Hardware
Integration Manual [1].
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5 Reliability tests and approvals
5.1 Reliability tests
☞
All MAX-M8 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.
5.2 Approvals
The MAX-M8C, MAX-M8Q, and MAX-M8W modules comply 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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6 Product handling & soldering
6.1 Packaging
MAX-M8 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 [5].
6.1.1
Reels
MAX-M8 GNSS modules are deliverable in quantities of 500 pieces on a reel. MAX-M8 modules are
shipped on Reel Type B, as specified in the u-blox Package Information Guide [5].
6.1.2
Tapes
Figure 4 shows the position and orientation of MAX-M8 modules as they are delivered on tape.
The dimensions of the tapes are specified in Figure 5.
Figure 4: Tape and module orientation
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Figure 5: MAX-M8 Tape dimensions
6.2 Shipment, storage and handling
For more information regarding shipment, storage and handling, see the u-blox Package Information
Guide [5].
6.2.1
Moisture Sensitivity Levels
The Moisture Sensitivity Level (MSL) relates to the packaging and handling precautions required.
MAX-M8 modules are rated at MSL level 4.
☞
For MSL standard, see IPC/JEDEC J-STD-020, which can be downloaded from www.jedec.org.
6.2.2
Reflow soldering
Reflow profiles are to be selected according to the u-blox recommendations (see the MAX-8 / MAX-M8
Hardware Integration Manual [1]).
6.2.3
ESD handling precautions
MAX-M8 modules are 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:
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MAX-M8 series - Data Sheet
•
•
•
•
•
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 to 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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7 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
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.
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.
NMEA and UBX are enabled as input messages, only NMEA as output messages
Maximum bit rate 400 kb/s.
TIMEPULSE
(1Hz 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 other settings.
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8 Labeling and ordering information
8.1 Product labeling
The labeling of u-blox M8 GNSS modules includes important product information. The location of the
product type number is shown in Figure 6.
Figure 6: Location of product type number on MAX-M8 module label
8.2 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-N
Type Number
PPP-TGV-N-XX
Table 12: Product code formats
The parts of the product code are explained in Table 13.
Code
Meaning
Example
PPP
Product Family
MAX
TG
Product Generation
M8 = u-blox M8
V
Variant
Function set (A-Z), T = Timing, R = DR, etc.
N
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 hardware or software revision, cable
length, etc.
Table 13: Part identification code
8.3 Ordering codes
Ordering No.
Product
MAX-M8C-0
u-blox M8 concurrent GNSS LCC Module, Crystal, ROM, 9.7x10.1 mm, 500 pieces/reel
MAX-M8Q-0
u-blox M8 concurrent GNSS LCC Module, TCXO, ROM, Green, 9.7x10.1 mm, 500 pieces/reel
MAX-M8W-0
u-blox M8 concurrent GNSS LCC Module, TCXO, Active Antenna Supply, ROM, 9.7x10.1 mm,
500 pieces/reel
Table 14: Product ordering codes for professional grade modules
☞
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
AEC
Automotive Electronics Council
BBR
Battery Backed RAM
DDC
Display Data Channel
EGNOS
European Geostationary Navigation Overlay Service
ESD
Electrostatic Sensitive Device*
FOC
Full Operational Capability
GAGAN
GPS Aided GEO Augmented Navigation
GLONASS
GLObal Navigation Satellite System (Russian)
GNSS
Global Navigation Satellite System
GPIO
General Purpose Input/Output
GPS
Global Positioning System
IMES
Indoor MEssaging System
I2C
Inter-Integrated Circuit
IEC
International Electrotechnical Commission
ISO
International Organization for Standardization
LCC
Leadless Chip Carrier
LCS
LoCation Services (protocol)
LNA
Low Noise Amplifier
MSAS
MTSAT Satellite Augmentation System
MSL
Moisture Sensitivity Level
NMEA
National Marine Electronics Association
PPP
Point-to-Point Protocol* / Precise Point Positioning*
PCB
Printed Circuit Board
PCN
Product Change Notification
PPS
Pulse Per Second
QZSS
Quasi-Zenith Satellite System
RLM
Return Link Message
RRLP
Radio Resource LCS Protocol
RTC
Real Time Clock
RTCM
Radio Technical Commission for Maritime Services
SAW
Surface Acoustic Wave
SBAS
Satellite-Based Augmentation System
SCL
Serial Clock
SMD
Solder Mask Defined
SUPL
Secure User Plane Location
TCXO
Temperature-Compensated Crystal Oscillator
TTFF
Time-To-First-Fix
UART
Universal Asynchronous Receiver/Transmitter
UTC
Coordinated Universal Time
WAAS
Wide Area Augmentation System
Table 15: Explanation of the abbreviations and terms used
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MAX-M8 series - Data Sheet
Related documents
[1]
[2]
MAX-8 / MAX-M8 Hardware Integration Manual, Doc. No. UBX-15030059
u-blox 8 / u-blox M8 Receiver Description including Protocol Specification (public version), Doc.
No. UBX-13003221
Power Management Application Note, Doc. No. UBX-13005162
RTCM 10402.3 Recommended Standards for Differential GNSS, Ver. 2.3, RTCM Aug. 20, 2001
u-blox Package Information Guide, Doc. No. UBX-14001652
Radio Resource LCS Protocol (RRLP), (3GPP TS 44.031 version 11.0.0 Release 11
[3]
[4]
[5]
[6]
☞
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
2-Jun-2016
ghun
Advance Information
R02
15-Aug-2016
ghun
Production Information
R03
28-Feb-2018
mbab
Rebranding
R04
30-Jan-2019
yzha
Updated Section 5.2(RoHS statement).
R05
27-May-2019
yzha
Updated Vin Absolute Maximum Rating
UBX-15031506 - R05
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Related documents
Page 29 of 30
MAX-M8 series - 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
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