NEO-M8
u-blox M8 concurrent GNSS modules
Data Sheet

Highlights:•

Concurrent reception of up to 3 GNSS (GPS, Galileo, GLONASS, BeiDou)•

Industry leading –167 dBm navigation sensitivity•

Security and integrity protection•

Supports all satellite augmentation systems•

Advanced jamming and spoofing detection Backward compatible with
NEO-7, NEO-6 and NEO-5 families

www.u-blox.com
UBX-15031086 - R03

NEO-M8 - Data Sheet

Document Information
Title

NEO-M8Subtitle

u-blox M8 concurrent GNSS modules

Document type

Data Sheet

Document number

UBX-15031086

Revision and Date

R03

Document status

Product Information

05-Aug-2016

Document status explanation
Objective Specification

Document contains target values. Revised and supplementary data will be published later.

Advance Information

Document contains data based on early testing. Revised and supplementary data will be published later.

Early Production Information

Document contains data from product verification. Revised and supplementary data may be published later.

Production Information

Document contains the final product specification.

This document applies to the following products:
Product name

Type number

ROM/FLASH version

NEO-M8N

NEO-M8N-0-10

Flash FW SPG 3.01

UBX-15030279

NEO-M8Q
NEO-M8M

NEO-M8Q-0-10
NEO-M8M-0-10

ROM SPG 3.01

UBX-16013121
UBX-16013121

ROM SPG 3.01

PCN reference

u-blox reserves all rights to this document and the information contained herein. Products, names, logos and designs described herein
may in whole or in part be subject to intellectual property rights. Reproduction, use, modification or disclosure to third parties of thisdocument or any part thereof without the express permission of u-blox is strictly prohibited.
The information contained herein is provided “as is” and u-blox assumes no liability for the use of the information. No warranty, either
express or implied, is given, including but not limited, with respect to the accuracy, correctness, reliability and fitness for a particularpurpose of the information. This document may be revised by u-blox at any time. For most recent documents, visit www.u-blox.com.
Copyright © 2016, u-blox AG.
u-blox® is a registered trademark of u-blox Holding AG in the EU and other countries. ARM® is the registered trademark of ARM Limited in
the EU and other countries.

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Contents
Contents.............................................................................................................................. 3
1

Functional description.................................................................................................. 6
1.1

Overview .............................................................................................................................................. 6

1.2
1.3

Product features ................................................................................................................................... 6
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
1.5.4

BeiDou .......................................................................................................................................... 9
Galileo ........................................................................................................................................... 9

1.6

Assisted GNSS (A-GNSS) ....................................................................................................................... 9
TM

1.6.1
1.6.2

AssistNow Online ........................................................................................................................ 9TM
AssistNow Offline ....................................................................................................................... 9

1.6.3

AssistNow Autonomous ............................................................................................................ 10

TM

1.7
Augmentation Systems ....................................................................................................................... 10
1.7.1
Satellite-Based Augmentation System (SBAS) ............................................................................... 10
1.7.2

QZSS ........................................................................................................................................... 10

1.7.3
1.7.4

IMES............................................................................................................................................ 10
Differential GPS (D-GPS) .............................................................................................................. 10

1.8

Broadcast navigation data and satellite signal measurements.............................................................. 11

1.9
1.10

Odometer ........................................................................................................................................... 11
Data logging (NEO-M8N) ................................................................................................................ 11

1.11

Geofenceing ................................................................................................................................... 11

1.12
1.13

Message Integrity Protection ........................................................................................................... 11
Spoofing Detection ......................................................................................................................... 11

1.14

EXTINT: External interrupt ............................................................................................................... 12

1.14.1
1.14.2

Pin Control .................................................................................................................................. 12
Aiding ......................................................................................................................................... 12

1.15

TIMEPULSE ...................................................................................................................................... 12

1.16
1.17

Protocols and interfaces .................................................................................................................. 12Interfaces ........................................................................................................................................ 12

1.17.1UART ........................................................................................................................................... 13

1.17.2
1.17.3

USB ............................................................................................................................................. 13
SPI ............................................................................................................................................... 13

1.17.4

Display Data Channel (DDC) ........................................................................................................ 13

1.18
Clock generation ............................................................................................................................ 13
1.18.1 Oscillators.................................................................................................................................... 13
1.18.2
1.19

Real-Time Clock (RTC) ................................................................................................................. 13
Power management ........................................................................................................................ 13

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NEO-M8 - Data Sheet

1.19.1
1.19.2

DC/DC converter ......................................................................................................................... 14Power Mode Setup ...................................................................................................................... 14

1.19.3

Continuous Mode ....................................................................................................................... 14

1.19.4 Power Save Mode ....................................................................................................................... 14
1.20
Antenna .......................................................................................................................................... 15
1.21

2

3

Pin Definition .............................................................................................................. 16
2.1

Pin assignment ................................................................................................................................... 16

2.2

Pin name changes............................................................................................................................... 17

Configuration management ...................................................................................... 18
3.1

4

LNA_EN .......................................................................................................................................... 15

Interface Selection (D_SEL) .................................................................................................................. 18

Electrical specification ................................................................................................ 19
4.1

Absolute maximum rating .................................................................................................................. 19

4.2

Operating conditions .......................................................................................................................... 20

4.3
4.4

Indicative current requirements ........................................................................................................... 21
SPI timing diagrams ............................................................................................................................ 22

4.4.1
4.5

Timing recommendations ............................................................................................................ 22

DDC timing diagrams ......................................................................................................................... 22

5

Mechanical specifications .......................................................................................... 23

6

Reliability tests and approvals .................................................................................. 24
6.1
6.2

7

Reliability tests .................................................................................................................................... 24
Approvals ........................................................................................................................................... 24

Product handling & soldering .................................................................................... 25
7.1
Packaging ........................................................................................................................................... 25
7.1.1
Reels ........................................................................................................................................... 25
7.1.2

Tapes .......................................................................................................................................... 25

7.2
Shipment, storage and handling ......................................................................................................... 26
7.2.1
Moisture Sensitivity Levels ........................................................................................................... 26
7.2.2

Reflow soldering ......................................................................................................................... 26

7.2.3

ESD handling precautions ............................................................................................................ 26

8

Default messages ....................................................................................................... 27

9

Labeling and ordering information........................................................................... 28
9.1

Product labeling.................................................................................................................................. 28

9.2

Explanation of codes........................................................................................................................... 28

9.3

Ordering codes ................................................................................................................................... 28

Related documents........................................................................................................... 29

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NEO-M8 - Data Sheet

Revision history ................................................................................................................ 29
Contact .............................................................................................................................. 30

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NEO-M8 - Data Sheet

1 Functional description
1.1

Overview

The NEO-M8 series of concurrent GNSS modules is built on the high performing u-blox M8 GNSS engine in theindustry proven NEO form factor.
The NEO-M8 series utilizes concurrent reception of up to three GNSS systems (GPS/Galileo together with BeiDouor GLONASS), recognizes multiple constellations simultaneously and provides outstanding positioning accuracy inscenarios where urban canyon or weak signals are involved. For even better and faster positioning improvement,
the NEO-M8 series supports augmentation of QZSS, GAGAN and IMES together with WAAS, EGNOS, MSAS. The
NEO-M8 series also supports message integrity protection, geofencing, and spoofing detection with configurable
interface settings to easily fit to customer applications. The NEO form factor allows easy migration from previous
NEO generations.
The NEO-M8M is optimized for cost sensitive applications, while NEO-M8N/M8Q provides best performance andeasier RF integration. The NEO-M8N offers high performance also at low power consumption levels. The futureproof NEO-M8N includes an internal Flash that allows future firmware updates. This makes NEO-M8N perfectly
suited to industrial and automotive applications.
The DDC (I2C compliant) interface provides connectivity and enables synergies with most u-blox cellular
modules. For RF optimization the NEO-M8N/Q features an additional front-end LNA for easier antenna
integration and a front-end SAW filter for increased jamming immunity.
u-blox 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”.
The u-blox NEO-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 thereceiver’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 6 days) provide faster acquisition after along off time.
See section 1.6 for more information concerning the NEO-M8 related AssistNow Assistance.

1.2

Product features

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NEO-M8 - Data Sheet

1.3

Performance

Parameter

Specification

Receiver type72-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%

Frequency of time
pulse signal0.25 Hz…10 MHz(configurable)

Operational limits 1

Dynamics≤4g

Altitude50,000 m

Velocity

500 m/s

Velocity accuracy 2
Heading accuracy

30 ns
60 ns

0.05m/s

2

0.3 degrees

GNSS

GPS & GLONASSGPSGLONASS

BeiDouGalileo

Horizontal position
accuracy 3

2.5 m

2.5 m

4m

3m

TBC4

NEO-M8N

5 Hz

10 Hz

10 Hz

10 Hz

10 Hz

NEO-M8Q

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

Aided starts 6

2s

2s

2s

3s

7s

Tracking &Navigation–167 dBm–166 dBm-166 dBm-160 dBm-159 dBm

NEO-M8N/Q
Max navigation
update rateTime-To-First-Fix

5

7

Sensitivity

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

10 Hz

18 Hz

18 Hz

18 Hz

18 Hz

Cold start

26 s

30 s

33 s

39 s

57 s

Hot start

1s

1s

1s

1s

1s

Aided starts 6

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-152dBm

Cold start-148 dBm-147 dBm-145 dBm-143 dBm-133 dBm

Hot start-157 dBm-156 dBm-155 dBm-155 dBm-151 dBm

NEO-M8M
Max navigation
update rateTime-To-First-Fix

Sensitivity

5

7

Table 1: NEO-M8 performance in different GNSS modes (default: concurrent reception of GPS and GLONASS incl. QZSS, SBAS)

1

Assuming Airborne < 4 g platform
50% @ 30m/s
3
CEP, 50%, 24 hours static, -130 dBm, > 6 SVs
4
To be confirmed when Galileo reaches full operational capability
5
All satellites at -130 dBm, except Galileo at -127 dBm
6Dependent on aiding data connection speed and latency
7
Demonstrated with a good external LNA
2

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NEO-M8 - Data Sheet

1.4

Block diagram

Figure 1: NEO-M8 block diagram

1.5

Supported GNSS Constellations

The NEO-M8 GNSS modules are concurrent GNSS receivers 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 GPSThe NEO-M8 positioning modules are designed to receive and track the L1C/A signals provided at 1575.42 MHz
by the Global Positioning System (GPS).

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NEO-M8 - Data Sheet

1.5.2 GLONASSThe NEO-M8 modules can receive and process the GLONASS satellite system as an alternative to the US-based
Global Positioning System (GPS). u-blox NEO-M8 positioning modules are designed to receive and track the L1OF
signals GLONASS provides 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-inphase. See the NEO-8Q / NEO-M8 Hardware Integration Manual [1] for u-blox design recommendations.

1.5.3 BeiDou
The NEO-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 anotherconstellation 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 NEO-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 andlong 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. u-blox therefore recommends to use Flash memory in designs utilizing Galileo
signals in order to allow for a FW update in the unlikely event of a change to the Galileo signal
specification (OS SIS ICD).
Galileo reception is by default disabled, but can be enabled by sending a configuration message (UBXCFG-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 GNSS receiver assistance information, such as ephemeris, almanac, rough user position and time, will
reduce the time to first fix significantly and improve 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 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 thetime to first fix significantly and improve acquisition sensitivity.
The AssistNow Online service provides data for GPS, GLONASS, BeiDou, Galileo and QZSS

1.6.2 AssistNowTM Offline
With the AssistNow Offline service, users can download long-term orbit data over the Internet at theirconvenience. The orbit data can be stored in the GNSS receiver’s SQI flash memory or alternatively within thememory 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.

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NEO-M8 - Data Sheet

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 Flashmemory based NEO-M8N module can predict accurate satellite ephemeris for up to six days after initialreception. The ROM based NEO-M8M/Q modules can use only GPS satellites with a prediction time of up to
three days.
u-blox AssistNow Autonomous benefits are:• Faster fix in situations where satellite signals are weak
• No connectivity required• Compatible with AssistNow Online and Offline (can work stand-alone, or in tandem with these services)• 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].

1.7

Augmentation Systems

1.7.1 Satellite-Based Augmentation System (SBAS)
The u-blox NEO-M8 modules support reception of SBAS broadcast signals. These systems supplement GNSS datawith additional regional or wide area GPS augmentation data. The system broadcasts range correction andintegrity 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 QZSSThe 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. NEO-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. The L1- SAIF signal provided by QZSS can be enabled for reception via a
GNSS configuration message.

1.7.3 IMESThe Japanese Indoor MEssaging System (IMES) system is used for indoor position reporting using low-powertransmitters which broadcast a GPS–like signal. NEO-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 receivers support Differential-GPS (D-GPS) data according to RTCM specification 10402.3 [4]: The use of
D-GPS improves GPS position accuracy. The RTCM implementation supports the following RTCM 2.3 messages.

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NEO-M8 - Data Sheet

Message Type

Description

1

Differential GPS Corrections

2
3

Delta Differential GPS Corrections
GPS Reference Station Parameters

9

GPS Partial Correction Set

Table 3: Supported RTCM 2.3 messages

RTCM corrections cannot be used together with SBAS.
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 NEO-M8 modules 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 aform 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].

1.9

Odometer

The odometer function provides information on travelled ground distance (in meters) based on the position and
Doppler-based velocity output from the navigation solution. For each computed distance since the last odometer
reset, the odometer estimates a 1-sigma accuracy value. The total cumulative ground distance is maintained andsaved 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 Data logging (NEO-M8N)
The NEO-M8N module can be used in data logging applications. The data logging feature enables continuous
storage of position, velocity and time information to an onboard SQI flash memory (at least 16 Mbit). It can also
log the distance from the odometer. The information can be downloaded from the receiver later for further
analysis or for conversion to a mapping tool. For more information see the u-blox 8 / u-blox M8 Receiver
Description Including Protocol Specification [2].

1.11 Geofencing
The u-blox NEO-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 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.

1.12 Message Integrity Protection
The NEO-M8 modules provide a function to detect third party interference with the UBX message steam sentfrom receiver to host. The security mechanism “signs” nominated messages via a subsequent UBX message. Thismessage signature is then compared with one generated by the host to determine if the message data has beenaltered. 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.

1.13 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, NEO-M8 modules include spoofing detection measures to alert the host when signals appear to be

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NEO-M8 - Data Sheetsuspicious. The receiver combines a number of checks on the received signals looking for inconsistencies acrossseveral parameters.
This feature does not guarantee to detect all spoofing attacks.

1.14 EXTINT: External interrupt
EXTINT is an external interrupt pin with fixed input voltage thresholds with respect to VCC. It can be used forcontrol of the receiver or for aiding.
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] and the NEO-8Q / NEO-M8 Hardware Integration
Manual [1].

1.14.1 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 forced OFF using EXTINT when Power Save Mode is not active.

1.14.2 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.
Provide the applied frequency value to the receiver using UBX messages.

1.15 TIMEPULSEA configurable time pulse signal is available with all u-blox M8 modules.
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.
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].

1.16 Protocols and interfaces
ProtocolNMEA 0183, version 4.0 (V2.1, V2.3 or V4.1
configurable)
UBX
RTCM

Type
Input/output, ASCII
Input/output, binary, u-blox proprietary
Input message, 1, 2, 3, 9

Table 4: Available Protocols
2

All protocols are available on UART, USB, DDC (I C compliant) and SPI. For specification of the various protocols
see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification [2].

1.17 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.

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NEO-M8 - Data Sheet

1.17.1 UARTThe NEO-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.

1.17.2 USB
A USB interface, which is compatible to USB version 2.0 FS (Full Speed, 12 Mbit/s), can be used forcommunication as an alternative to the UART. The pull-up resistor on pin USB_DP is integrated to signal a fullspeed 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.

1.17.3 SPIThe SPI interface is designed to allow communication to a host CPU. The interface can be operated in slave
mode only. The maximum transfer rate using SPI is 125kB/s and the maximum SPI clock frequency is 5.5 MHz.
Note that SPI is not available in the default configuration, because its pins are shared with the UART and DDC
interfaces. The SPI interface can be enabled by connecting D_SEL (Pin 2) to ground (see section 3.1).

1.17.4 Display Data Channel (DDC)
2An I C 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
2
compatible with Fast-Mode of the I C industry standard. Since the maximum SCL clock frequency is 400 kHz, themaximum transfer rate is 400 kb/s.

1.18 Clock generation
1.18.1 Oscillators
NEO-M8 GNSS modules are available in TCXO and crystal versions. The TCXO allows accelerated weak signal
acquisition, enabling faster start and reacquisition times.
Oscillators used on NEO-M8 modules 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 u-blox modules
being the most reliable positioning modules in the industry, particularly in challenging conditions.

1.18.2 Real-Time Clock (RTC)
The RTC is driven by a 32 kHz oscillator using an RTC crystal. If the main supply voltage fails, and a battery isconnected to V_BCKP, parts of the receiver switch off, but the RTC still runs providing a timing reference for thereceiver. 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.

1.19 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.

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1.19.1 DC/DC converter
The NEO-M8 modules integrate a DC/DC converter, allowing reduced power consumption especially when usinga main supply voltage above 2.5 V.
For more information see the NEO-8Q / NEO-M8 Hardware Integration Manual [1].

1.19.2 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 tocover the majority of users’ requirements.
For specific power saving applications the user has the option to fully configure via the power save mode
configuration. For more information, see section 1.19.4
The u-blox M8 modules’ 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 1Hz cyclic tracking mode for aggressive power reduction•

Choice of 2 or 4 Hz cyclic tracking modes for typical wearable applications•

ON/OFF interval mode

8

1.19.3 Continuous Mode
Continuous Mode uses the acquisition engine at full performance resulting in the shortest possible TTFF and thehighest sensitivity. It searches for all possible satellites until the Almanac is completely downloaded. The receiverthen switches to the tracking engine to lower 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

1.19.4 Power Save Mode
For specific power saving applications outside the typical preset power mode setups, users can configure atailored Power Save Mode.
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 byusing 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].

8Single GNSS constellation configuration only

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1.20 Antenna
910NEO-M8 modules are designed for use with passive and active 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)
5011 dB / 30 12 dB
1.5 dB

Table 5: Antenna Specifications for NEO-M8 modules

1.21 LNA_EN
The LNA_EN pin provides optional control for switching off power to an active antenna or separate LNA. Thisfacility is provided to help minimize power consumption in power save mode operation. See the NEO-8Q / NEOM8 Hardware Integration Manual [1] for more information.

9

For integration of NEO-M8 modules with Cellular products, see the NEO-8Q / NEO-M8 Hardware Integration Manual [1].
For information on using active antennas with NEO-M8 modules, see the NEO-8Q / NEO-M8 Hardware Integration Manual [1].
11
NEO-M8M
12
NEO-M8N/Q
10

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NEO-M8 - Data Sheet

2 Pin Definition
2.1

Pin assignment

Figure 2: Pin Assignment
No

Name

I/O

Description

1

SAFEBOOT_N

I

SAFEBOOT_N (for future service, updates and reconfiguration, leave OPEN)

2

D_SEL

I

Interface select3
4

TIMEPULSE
EXTINT

O
I

Time pulse (1PPS)
External Interrupt Pin

5
6

USB_DM
USB_DP

I/O
I/O

USB Data
USB Data

7

VDD_USBI

USB Supply

8
9

RESET_N
VCC_RFIORESET_N
Output Voltage RF section

10
11

GND
RF_IN

I
I

GroundGNSS signal input

12

GND

I

Ground13

GND

I

Ground14

LNA_EN / Reserved

O

LNA_EN (NEO-M8N/Q): Antenna/LNA control
Reserved (NEO-M8M): Reserved

15
16

Reserved
Reserved-

Reserved
Reserved

17

-

22
23

ReservedSDA /SPI CS_NSCL /SPI CLKTXD /SPI MISORXD /SPI MOSIV_BCKP
VCC

I
IReserved
DDC Data if D_SEL =1 (or open)
SPI Chip Select if D_SEL = 0
DDC Clock if D_SEL =1(or open)
SPI Clock if D_SEL = 0
Serial Port if D_SEL =1(or open)
SPI MISO if D_SEL = 0
Serial Port if D_SEL =1(or open)
SPI MOSI if D_SEL = 0
Backup voltage supply
Supply voltage

24

GND

I

Ground

18
19
20
21

I/O
I/O
O
I

Table 6: Pinout of NEO-M8

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Pins designated Reserved should not be used. For more information about Pinouts see the NEO-8Q / NEOM8 Hardware Integration Manua [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 tablebelow lists the pins that have changed name along with their old and new names.
No

Previous Name

New name

1

Reserved

SAFEBOOT_N

14

ANT_ONTxD
SPI MISO
RxD
SPI MOSI

LNA_ENTXD /SPI MISORXD /SPI MOSI

20
21

Table 7: Pin name changes

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NEO-M8 - Data Sheet

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.
With the NEO-M8, configuration settings modified with UBX configuration messages can be saved permanently.
In this case, the modified settings remain effective even after power-down and do not require backup battery
supply.

3.1

Interface Selection (D_SEL)

At startup Pin 2 (D_SEL) determines which data interfaces are used for communication. If D_SEL is set high orleft open, UART and DDC become available. If D_SEL is set low, i.e. connected to ground, the NEO-M8 module
series can communicate to a host via SPI.

20
21

D_SEL=”1”(left open)
UART TXUART RXD_SEL =”0”(connected to GND)
SPI MISO
SPI MOSI

19
18

DDC SCL
DDC SDASPI CLKSPI CS_NPIN #Table 8: Data interface selection by D_SEL

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4 Electrical specification
The limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stressabove one or more of the limiting values may cause permanent damage to the device. These are stressratings only and operation of the device at these or at any other conditions above those given in thecharacteristics 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 NEO-8Q / NEO-M8 Hardware Integration Manua [1].

4.1

Absolute maximum rating

Parameter

SymbolPower supply voltage
Backup battery voltage
USB supply voltage
Input pin voltage
DC current trough any digital I/O pin(except supplies)
VCC_RF output current

Condition

Min

Max

Units

VCC
V_BCKP

–0.5
–0.5

3.6
3.6

V
V

VDD_USB
Vin

–0.5
–0.5

3.6
VCC+0.5

VV

Vin_usb
Ipin–0.5

VDD_USB
10VmA

ICC_RF

Input power at RF_IN

Prfin

Storage temperature

Tstg

source impedance = 50 Ω,
continuous wave
–40

100

mA

15

dBm

85

°C

Table 9: 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 intable above, must be limited to values within the specified boundaries by using appropriate
protection diodes.

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4.2

Operating conditions
All specifications are at an ambient temperature of 25°C. Extreme operating temperatures cansignificantly impact specification values. Applications operating near the temperature limits should betested to ensure the specification.

Parameter

SymbolMin

TypicalMax

Power supply voltage

VCC

2.7

3.0

3.6

Unit
s
V

Supply voltage USB
Backup battery voltage

VDDUSB
V_BCKP

3.0
1.4

3.3

3.6
3.6

V
V

Condition

Backup battery current

I_BCKP

15µA

V_BCKP = 1.8 V, VCC = 0 V

SW backup current
Input pin voltage range

I_SWBCKP
Vin

30

VCC = 3 V

0

VCC

µA
V

Digital IO Pin Low level input voltage
Digital IO Pin High level input voltage

Vil
Vih

0
0.7*VCC

0.2*VCC
VCC

V
V

Digital IO Pin Low level output voltage
Digital IO Pin High level output voltage

Vol
Voh

0.4
VCC–0.4

V
V

Pull-up resistor for RESET_N (internal)

Rpu

USB_DM, USB_DP

VinU

VCC_RF voltage

VCC_RF

VCC_RF output current
Receiver Chain Noise Figure 13

ICC_RF
NFtot

Operating temperature

Topr

Iol = 4mA
Ioh = 4mA

11kΩ
Compatible with USB with 27 Ω series resistance
VCC–0.1

V
50

mA
dB

85

°C

2.0
–40

Table 10: Operating conditions

Operation beyond the specified operating conditions can affect device reliability.

13

Only valid for the GPS band

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4.3

Indicative current requirements

Table 11 lists examples of the total system supply current for a possible application.
Values in Table 11 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
Max. supply current

14

Typ
GPS

All
NEO-M8N

32

NEO-M8M
NEO-M8Q

ModuleIccp
Icc Acquisition17

Average supply current 15, 16

TypGPS & GLONASS

SymbolIcc Tracking(Continuous mode)

Icc Tracking(Power Save mode / 1 Hz)

Max

Units

67
25

mA
mA

24
30

19
24

mA
mA

NEO-M8N
NEO-M8M

30
21

23
17

mA
mA

NEO-M8Q

28

23

mA

NEO-M8N
NEO-M8M

13
5.3

12
4.8

mA
mA

NEO-M8Q

11.5

11.1

mA

Condition

Estimated at 3 V

Estimated at 3 V

Estimated at 3 V

Table 11: Indicative power requirements at 3.0 V

For more information about power requirements, see the NEO-8Q / NEO-M8 Hardware Integration Manua[1].
For more information on how to noticeably reduce current consumption, see the Power Management
Application Note [5].

14

Use this figure to dimension maximum current capability of power supply. Measurement of this parameter with 1 Hz bandwidth.
Use this figure to determine required battery capacity.
16
Simulated GNSS constellation using power levels of -130 dBm. VCC = 3.0 V
17
Average current from start-up until the first fix.
15

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4.4

SPI timing diagrams

In order to avoid incorrect operation of the SPI, the user needs to comply with certain timing conditions. The
following signals need to be considered for timing constraints:
SymbolDescription

SPI CS_N (SS_N)

Slave select signal

SPI CLK (SCK)

Slave clock signal

Table 12: Symbol description

Figure 3: SPI timing diagram

4.4.1 Timing recommendations
The recommendations below are based on a firmware running from Flash memory.
Parameter

Description

RecommendationtINIT

Minimum Initialization Time

10 us

tDES

Deselect Time

1 ms.

tbit
tbyte

Minimum bit time
Minimum byte period

180 ns (5.5 MHz max bit frequency)
8 µs (125 kHz max byte frequency)

Table 13: SPI timing recommendations

The values in the above table result from the requirement of an error-free transmission. By allowing just a
few errors and disabling the glitch filter, the bit rate can be increased considerably.

4.5

DDC timing diagrams
2

2

The DDC interface is I C Fast Mode compliant. For timing parameters consult the I C 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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5 Mechanical specifications

Figure 4: Dimensions

For information about the paste mask and footprint, see the NEO-8Q / NEO-M8 Hardware Integration
Manua [1].

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6 Reliability tests and approvals
6.1

Reliability tests
All NEO-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.

6.2

Approvals
Products marked with this lead-free symbol on the product label comply with the"Directive 2002/95/EC of the European Parliament and the Council on the Restriction of
Use of certain Hazardous Substances in Electrical and Electronic Equipment" (RoHS).
All u-blox M8 GNSS modules are RoHS compliant.

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7 Product handling & soldering
7.1

Packaging

The NEO-M8 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 NEO-M8 GNSS modules are deliverable in quantities of 250 pcs on a reel. The NEO-M8 modules 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 NEO-M8 modules are specified in Figure 5.

Figure 5: Dimensions and orientation for NEO-M8 modules on tape

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NEO-M8 - Data Sheet

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 NEO-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.
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 NEO-8Q / NEO-M8 Hardware
Integration Manual [1]).

7.2.3 ESD handling precautions
NEO-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. Particularcare 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 thereceiver:•Unless there is a galvanic coupling between thelocal 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 candevelop 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 istouched in non ESD protected work area,
implement proper ESD protection measures in thedesign.

•When soldering RF connectors and patch
antennas to the receiver’s RF pin, make sure touse 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
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
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.
Automatically accepts following protocols without need of explicit configuration:
UBX, NMEAThe GPS receiver supports interleaved UBX and NMEA messages.
USB Power Mode: Bus Powered
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.
Allow communication to a host CPU, operated in slave mode only. Default messages activated. SPI is notavailable in the default configuration.
1 pulse per second, synchronized at rising edge, pulse length 100 ms

USB Output

UART Input

USB Input

DDC

SPI
TIMEPULSE(1 Hz Nav)
Table 14: 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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NEO-M8 - Data Sheet

9 Labeling and ordering information
9.1

Product labeling

The labeling of u-blox NEO-M8 GNSS modules includes important product information. The location of the
NEO-M8 product type number is shown in Figure 6.

Figure 6: Location of product type number on u-blox NEO-M8 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 Codeincludes options and quality, while the Type Number includes the hardware and firmware versions. Table 15
shows the structure of these three different formats.
FormatStructure

Product Name
Ordering Code

PPP-TGV
PPP-TGV-N

Type Number

PPP-TGV-N-XX

Table 15: Product Code Formats

The parts of the product code are explained in Table 16.
Code

Meaning

ExamplePPP

Product Family

NEO

TG

Platform

M8 = u-blox M8

V
N

Variant
Option / Quality GradeXX

Product Detail

Function set (A-Z), T = Timing, R = DR, etc.
Describes standardized functional element or quality grade
0 = Default variant, A = Automotive
Describes product details or options such as hard- and software revision, cable length, etc.

Table 16: part identification code

9.3

Ordering codes

Ordering No.

Product

NEO-M8M-0

u-blox M8 Concurrent GNSS LCC Module, crystal, ROM, 12.2x16 mm, 250 pcs/reel

NEO-M8N-0

u-blox M8 Concurrent GNSS LCC Module, TCXO, flash, SAW, LNA, 12.2x16 mm, 250 pcs/reel

NEO-M8Q-0

u-blox M8 Concurrent GNSS LCC Module, TCXO, ROM, SAW, LNA, 12.2x16 mm, 250 pcs/reel

Table 17: 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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NEO-M8 - Data Sheet

Related documents[1][2]

NEO-8Q / NEO-M8 Hardware Integration Manual, Doc. No. UBX-15029985
u-blox 8 / u-blox M8 Receiver Description including Protocol Specification (Public version), Doc. No.
UBX-13003221

[3]
[4]

u-blox Package Information Guide, Doc. No. UBX-14001652
RTCM 10402.3 Recommended Standards for Differential GNSS, Ver. 2.3, RTCM AUG. 20, 2001

[5]

Power Management Application Note, Doc. No. UBX-13005162[6]

Radio Resource LCS Protocol (RRLP), (3GPP TS 44.031 version 11.0.0 Release 11)
For regular updates to u-blox documentation and to receive product change notifications, register on our
homepage (http://www.u-blox.com).

Revision history
Revision

Date

Name

Status / Comments

R01
R02

28-Jan-2016
01-Jun-2016

byou
byou

Advance Information
Added NEO-M8M and NEO-M8Q variant information, pin name change advisory

R03

05-Aug-2016

byou

Product Information

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NEO-M8 - Data SheetContact
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:+1 408 573 3640
E-mail:info_us@u-blox.com

Headquarters
Europe, Middle East, Africa

Asia, Australia, Pacificu-blox AG

Phone:
E-mail:Support:Phone:
E-mail:Support:+41 44 722 74 44
info@u-blox.com
support@u-blox.com

Technical Support:
Phone:
E-mail:+1 703 483 3185
support_us@u-blox.com

u-blox Singapore Pte. Ltd.
+65 6734 3811
info_ap@u-blox.com
support_ap@u-blox.com

Regional Office Australia:
Phone:+61 2 8448 2016
E-mail:info_anz@u-blox.com
Support: support_ap@u-blox.com
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Phone:+86 10 68 133 545
E-mail:info_cn@u-blox.com
Support: support_cn@u-blox.com
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Phone:
E-mail:Support:+86 23 6815 1588
info_cn@u-blox.com
support_cn@u-blox.com

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E-mail:Support:+86 21 6090 4832
info_cn@u-blox.com
support_cn@u-blox.com

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E-mail:info_cn@u-blox.com
Support: support_cn@u-blox.com
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Phone:+91 80 4050 9200
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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