NEO-M8N_技术文档

NEO-M8

u-blox M8 concurrent GNSS modules

Data Sheet

Highlights:



Concurrent reception of GPS/QZSS, GLONASS, BeiDou

Industry leading –167 dBm navigation sensitivity

Product variants to meet performance and cost requirements

Combines low power consumption and high sensitivity

Backward compatible with NEO-7, NEO-6 and NEO-5 families

www.u-blox.com

UBX-13003366 - R10

NEO-M8 - Data Sheet

Document Information

Title

NEO-M8

Subtitle

u-blox M8 concurrent GNSS modules

Data Sheet

Document type

Document number

Revision and Date

Document status

UBX-13003366

R10

21-Oct-2015

Production Information

Document status explanation

Objective Specification

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

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

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

Document contains the final product specification.

Advance Information

Early Production Information

Production Information

This document applies to the following products:

Product name

Type number

ROM/FLASH version

PCN reference

NEO-M8N

NEO-M8M

NEO-M8Q

NEO-M8N-0-01

NEO-M8M-0-01

NEO-M8Q-0-01

ROM 2.01/Flash FW 2.01

ROM 2.01

N/A

UBX-15015253

ROM 2.01

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 this

document 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 particular

purpose of the information. This document may be revised by u-blox at any time. For most recent documents, visit www.u-blox.com.

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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NEO-M8 - Data Sheet

Contents

Contents..............................................................................................................................3

1 Functional description..................................................................................................5

1.1

1.2

1.3

1.4

1.5

Overview .............................................................................................................................................. 5

Product features................................................................................................................................... 5

Performance......................................................................................................................................... 6

Block diagram....................................................................................................................................... 7

GNSS.................................................................................................................................................... 7

1.5.1

1.5.2

GPS............................................................................................................................................... 7

GLONASS...................................................................................................................................... 7

BeiDou .......................................................................................................................................... 7

Galileo........................................................................................................................................... 8

QZSS ............................................................................................................................................. 8

1.5.3

1.5.4

1.5.5

1.6

1.6.1

1.6.2

1.6.3

1.7

1.7.1

1.7.2

Assisted GNSS (A-GNSS)....................................................................................................................... 8

AssistNow^TMOnline........................................................................................................................ 8

AssistNow^TMOffline ....................................................................................................................... 8

AssistNow^TMAutonomous.............................................................................................................. 8

Augmentation Systems......................................................................................................................... 9

Satellite-Based Augmentation System (SBAS)................................................................................. 9

Differential GPS (D-GPS)................................................................................................................ 9

Odometer............................................................................................................................................. 9

Data logging (NEO-M8N)...................................................................................................................... 9

EXTINT: External interrupt ................................................................................................................. 9

1.8

1.9

1.10

1.10.1 Pin Control.................................................................................................................................... 9

1.10.2 Aiding ......................................................................................................................................... 10

1.11

TIMEPULSE...................................................................................................................................... 10

Protocols and interfaces.................................................................................................................. 10

Interfaces........................................................................................................................................ 10

1.12

1.13

1.13.1 UART........................................................................................................................................... 10

1.13.2 USB............................................................................................................................................. 10

1.13.3 SPI............................................................................................................................................... 10

1.13.4 Display Data Channel (DDC)........................................................................................................ 11

1.14

Clock generation ............................................................................................................................ 11

1.14.1 Oscillators.................................................................................................................................... 11

1.14.2 Real-Time Clock (RTC) ................................................................................................................. 11

1.15

Power management........................................................................................................................ 11

1.15.1 DC/DC converter......................................................................................................................... 11

1.15.2 Operating modes ........................................................................................................................ 11

1.16

Antenna.......................................................................................................................................... 12

2 Pin Definition..............................................................................................................13

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NEO-M8 - Data Sheet

2.1

Pin assignment ................................................................................................................................... 13

3 Configuration management......................................................................................14

3.1

Interface Selection (D_SEL).................................................................................................................. 14

4 Electrical specification................................................................................................15

4.1

4.2

4.3

4.4

Absolute maximum rating .................................................................................................................. 15

Operating conditions.......................................................................................................................... 16

Indicative current requirements........................................................................................................... 17

SPI timing diagrams............................................................................................................................ 17

4.4.1

Timing recommendations............................................................................................................ 18

4.5

DDC timing diagrams ......................................................................................................................... 18

5 Mechanical specifications ..........................................................................................19

6 Reliability tests and approvals ..................................................................................20

6.1

Reliability tests.................................................................................................................................... 20

6.2

Approvals ........................................................................................................................................... 20

7 Product handling & soldering....................................................................................21

7.1

7.1.1

7.1.2

7.2

7.2.1

7.2.2

7.2.3

Packaging........................................................................................................................................... 21

Reels ........................................................................................................................................... 21

Tapes .......................................................................................................................................... 21

Shipment, storage and handling......................................................................................................... 22

Moisture Sensitivity Levels ........................................................................................................... 22

Reflow soldering ......................................................................................................................... 22

ESD handling precautions............................................................................................................ 22

8 Default messages .......................................................................................................23

9 Labeling and ordering information...........................................................................24

9.1

9.2

9.3

Product labeling.................................................................................................................................. 24

Explanation of codes .......................................................................................................................... 24

Ordering codes................................................................................................................................... 24

Related documents ..........................................................................................................25

Revision history................................................................................................................25

Contact..............................................................................................................................26

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NEO-M8 - Data Sheet

1 Functional description

1.1 Overview

The NEO-M8 series of standalone concurrent GNSS modules is built on the exceptional performance of the

u-blox M8 GNSS (GPS, GLONASS, BeiDou, QZSS, SBAS and Galileo-ready¹) engine in the industry proven NEO

form factor.

The NEO-M8 series provides high sensitivity and minimal acquisition times while maintaining low system power.

The NEO-M8M is optimized for cost sensitive applications, while NEO-M8N/M8Q provides best performance and

easier RF integration. The NEO form factor allows easy migration from previous NEO generations. Sophisticated

RF-architecture and interference suppression ensure maximum performance even in GNSS-hostile environments.

The NEO-M8 series combines a high level of robustness and integration capability with flexible connectivity

options. The future-proof NEO-M8N includes an internal Flash that allows simple firmware upgrades for

supporting additional GNSS systems. This makes NEO-M8 perfectly suited to industrial and automotive

applications.

The DDC (I²C compatible) interface provides connectivity and enables synergies with most u-blox cellular

modules. For RF optimization the NEO-M8N/M8Q 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”.

u-blox’ AssistNow Assistance supply aiding information, such as ephemeris, almanac, rough last position and

time, reduce the time to first fix significantly and improve the acquisition sensitivity. AssistNow data are with

u-blox M8 supporting both GPS and GLONASS constellation for faster acquisition than a GPS-only assistance.

The extended validity of AssistNow Offline data (up to 35 days) and AssistNow Autonomous data (up to 6 days)

provide faster acquisition after long off time.

See section Error! Reference source not found. for more information concerning the NEO-M8 series

related AssistNow Assistance.

1.2 Product features

¹with future flash firmware update

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NEO-M8 - Data Sheet

1.3 Performance

Parameter

Specification

Receiver type

72-channel u-blox M8 engine

GPS L1C/A

SBAS L1C/A

QZSS L1C/A

GLONASS L1OF

BeiDou B1

Galileo E1B/C²

NEO-M8N/Q

Time-To-First-Fix ³

GNSS

GPS & GLONASS

26 s

GPS & BeiDou

27 s

GPS

Cold start

29 s

Hot start

1 s

Aided starts ⁴

Tracking & Navigation

Reacquisition

Cold start

2 s

3 s ⁵

2 s

Sensitivity ⁶

–167 dBm

–160 dBm

–148 dBm

–156 dBm

GPS & GLONASS

27 s

–165 dBm

–160 dBm

–148 dBm

–156 dBm

GPS & BeiDou

28 s

–166 dBm

–160 dBm

–148 dBm

–156 dBm

GPS

Hot start

NEO-M8M

Time-To-First-Fix ³

GNSS

Cold start

30 s

Hot start

1 s

Aided starts ⁴

Tracking & Navigation

Reacquisition

Cold start

4 s

6 s ⁵

3 s

Sensitivity ⁶

–164 dBm

–159 dBm

–147 dBm

–156 dBm

GPS & GLONASS

–162 dBm

–159 dBm

–147 dBm

–156 dBm

GPS & BeiDou

–163 dBm

–159 dBm

–147 dBm

–156 dBm

GPS

Hot start

TCXO or Crystal

GNSS

Max navigation update rate

NEO-M8N

5 Hz

10 Hz

18 Hz

NEO-M8M/Q

10 Hz

Velocity accuracy ⁷

0.05 m/s

Heading accuracy ⁷

0.3 degrees

Horizontal position accuracy ⁸

Autonomous

SBAS

2.5 m

2.0 m

Accuracy of time pulse signal

RMS

99%

30 ns

60 ns

Frequency of time pulse signal

Operational limits ⁹

0.25 Hz…10 MHz (configurable)

Dynamics

Altitude

Velocity

 4 g

50,000 m

500 m/s

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

2

Ready to support Galileo E1B/C when available (NEO-M8N)

All satellites at -130 dBm

Dependent on aiding data connection speed and latency

BeiDou assisted acquisition is not available with FW 2.01

Demonstrated with a good external LNA

50% @ 30 m/s

CEP, 50%, 24 hours static, -130 dBm, > 6 SVs

Assuming Airborne < 4 g platform

3

4

5

6

7

8

9

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NEO-M8 - Data Sheet

1.4 Block diagram

Figure 1: NEO-M8 block diagram

1.5 GNSS

The NEO-M8 GNSS modules are concurrent GNSS receivers and can receive and track multiple GNSS systems

(e.g. GPS, GLONASS, Galileo-ready, BeiDou and QZSS signals). Because of the dual-frequency RF front-end

architecture, two of the three signals (GPS L1C/A, GLONASS L1OF and BeiDou B1) can be received and

processed concurrently. By default the M8 receivers are configured for concurrent GPS (includes SBAS and QZSS)

and GLONASS reception. If power consumption is a key factor, then the receiver should be configured for single

GNSS operation using either GPS or GLONASS or BeiDou and disabling QZSS and SBAS.

Galileo, QZSS and SBAS share the same frequency band as GPS and can always be processed in

conjunction with GPS.

1.5.1 GPS

The 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). The NEO-M8 series can receive and process GPS concurrently with

GLONASS or BeiDou.

1.5.2 GLONASS

The NEO-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

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-in

phase. See the NEO-M8 Hardware Integration Manual [1] for u-blox design recommendations.

1.5.3 BeiDou

The NEO-M8 modules can receive and process BeiDou concurrently with GPS or GLONASS. u-blox NEO-M8

positioning modules are designed to receive and track the B1 signals provided at 1561.098 MHz by the BeiDou

Navigation Satellite System. The ability to receive and track BeiDou B1 satellite signals in conjunction with GPS

results in higher coverage, improved reliability and better accuracy. By the end of 2013 BeiDou is not fully

operational and provides regional coverage only. Global coverage is scheduled for 2020.

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NEO-M8 - Data Sheet

1.5.4 Galileo

The NEO-M8N positioning module is ready to receive and track GPS and Galileo signals concurrently, enhancing

accuracy and coverage. When Galileo E1B/C signals become available, u-blox NEO-M8N receiver equipped with

an SQI flash memory device will be capable of receiving and processing them via a firmware update.

1.5.5 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. NEO-M8 series positioning modules are able to

receive and track these signals concurrently with GPS signals, resulting in better availability especially under bad

signal conditions, e.g. in urban canyons. The L1-SAIF signal provided by QZSS is not supported.

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 M8 products support the u-blox AssistNow

Online and AssistNow Offline A-GNSS services, support AssistNow Autonomous, and are OMA SUPL compliant.

1.6.1 AssistNow^TMOnline

With AssistNow Online, an internet-connected GNSS device downloads assistance data from u-blox’ 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.

1.6.2 AssistNow^TMOffline

With AssistNow Offline, users download u-blox’ long-term orbit data from the Internet at their convenience. The

orbit data can be stored in the GNSS receiver’s SQI flash memory (NEO-M8N) or must be stored in the memory

of the application processor (NEO-M8M/M8Q). Thus the service 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.

1.6.3 AssistNow^TMAutonomous

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 satellite orbital data (“AssistNow

Autonomous data”) that is usable for future GNSS position fixes. The concept capitalizes on the periodic nature

of GNSS satellites: their position in the sky is basically repeated every 24 hours. By capturing strategic ephemeris

data at specific times of the day, the receiver can predict accurate satellite ephemeris for up to six days after

initial reception. If using AssistNow Autonomous, the use of NEO-M8N (with SQI flash memory) is highly

recommended.

u-blox’ AssistNow Autonomous benefits are:



Faster fix in situations where GNSS 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 ROM-based NEO-M8M/M8Q receivers, AssistNow Autonomous can calculate GPS only orbit

predictions for up to 6 days (3 days by defaults).

For more details see the u-blox M8 Receiver Description Including Protocol Specification [2].

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NEO-M8 - Data Sheet

1.7 Augmentation Systems

1.7.1 Satellite-Based Augmentation System (SBAS)

The 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: WAAS, EGNOS and MSAS.

For more details see the u-blox M8 Receiver Description Including Protocol Specification [2].

1.7.2 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

2

3

9

Differential GPS Corrections

Delta Differential GPS Corrections

GPS Reference Station Parameters

GPS Partial Correction Set

Table 2: Supported RTCM 2.3 messages

For more details see the u-blox M8 Receiver Description Including Protocol Specification [2].

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 M8 Receiver Description

Including Protocol Specification [2].

1.9 Data logging (NEO-M8N)

The u-blox NEO-M8N receiver 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 M8 Receiver

Description Including Protocol Specification [2].

1.10 EXTINT: External interrupt

EXTINT is an external interrupt pin with fixed input voltage thresholds with respect to VCC. It can be used for

control of the receiver or for aiding.

For more information about how to implement and configure these features, see the u-blox M8 Receiver

Description including Protocol Specification [2] and the NEO-M8 Hardware Integration Manual [1].

1.10.1 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.

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NEO-M8 - Data Sheet

1.10.2 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.

1.11 TIMEPULSE

A 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 M8

Receiver Description including Protocol Specification [2].

1.12 Protocols and interfaces

Protocol

Type

NMEA 0183, version 4.0 (V2.3 or V4.1 configurable)

Input/output, ASCII

UBX

Input/output, binary, u-blox proprietary

Input message, 1, 2, 3, 9

RTCM

Table 3: Available Protocols

All protocols are available on UART, USB, DDC (I²C compliant) and SPI. For specification of the various protocols

see the u-blox M8 Receiver Description Including Protocol Specification [2].

1.13 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.

1.13.1 UART

The NEO-M8 series 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 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.

1.13.2 USB

A USB version 2.0 FS compatible interface can be used for communication as an alternative to the UART. The

pull-up resistor on pin USB_DP is integrated to signal a full-speed device to the host. The VDD_USB pin supplies

the USB interface.

u-blox USB (CDC-ACM) driver supports Windows Vista and Windows 7 and Windows 8 operating systems.

1.13.3 SPI

The 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 1 Mb/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).

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1.13.4 Display Data Channel (DDC)

An I²C compliant DDC interface is available for communication with an external host CPU or u-blox cellular

modules. The interface can be operated in slave mode only. The DDC protocol and electrical interface are fully

compatible with Fast-Mode of the I²C industry standard. Since the maximum SCL clock frequency is 400 kHz, the

maximum transfer rate is 400 kb/s.

1.14 Clock generation

1.14.1 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 module are carefully selected and screened for stability and against frequency

perturbations across the full operating range (–40° to +85°C).

The careful selection and qualification of critical parts, such as GNSS oscillators, has resulted in u-blox modules

being the most reliable positioning modules in the industry, particularly in challenging conditions.

1.14.2 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 is

connected to V_BCKP, parts of the receiver switch off, but the RTC still runs providing a timing reference for the

receiver. This operating mode is called Hardware Backup Mode, which enables all relevant data to be saved in

the backup RAM to allow a hot or warm start later.

1.15 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.

1.15.1 DC/DC converter

NEO-M8 series modules integrate a DC/DC converter, allowing reduced power consumption especially when

using a main supply voltage above 2.5 V.

For more information see the NEO-M8 Hardware Integration Manual [1]

1.15.2 Operating modes

u-blox M8 modules have two operating modes:



Continuous Mode for best GNSS performance

Power Save Mode to optimize power consumption

1.15.2.1 Continuous Mode

Continuous Mode uses the acquisition engine at full performance resulting in the shortest possible TTFF and the

highest sensitivity. It searches for all possible satellites until the Almanac is completely downloaded. The receiver

then switches to the tracking engine to lower power consumption.

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

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NEO-M8 - Data Sheet

1.15.2.2 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 operations can be set by

using a specific UBX message.

For more information about power management strategies, see the u-blox M8 Receiver Description

Including Protocol Specification [2].

Power Save Mode is only available in GPS mode.

1.16 Antenna

NEO-M8 series modules are designed for use with passive¹⁰and active¹¹antennas.

Parameter

Specification

Antenna Type

Passive and active antenna

Minimum gain

Maximum gain

Maximum noise figure

15 dB (to compensate signal loss in RF cable)

Active Antenna Recommendations

50 ¹²dB / 30 ¹³dB

1.5 dB

Table 4: Antenna Specifications for all NEO-M8 modules

10

For integration NEO-M8 modules with Cellular products, see the NEO-M8 Hardware Integration Manual [1].

For information on using active antennas with NEO-M8 modules, see the NEO-M8 Hardware Integration Manual [1].

11

¹²NEO-M8M

¹³NEO-M8N/M8Q

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NEO-M8 - Data Sheet

2 Pin Definition

2.1 Pin assignment

Figure 2: Pin Assignment

No

Module

Name

I/O

Description

1

All

Reserved

I

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

2

3

All

D_SEL

I

Interface select

Time pulse (1PPS)

External Interrupt Pin

USB Data

All

TIMEPULSE

EXTINT

O

4

All

I

5

All

USB_DM

USB_DP

VDD_USB

RESET_N

VCC_RF

GND

I/O

6

All

I/O

USB Data

7

All

I

USB Supply

8

All

I

RESET_N

9

All

O

I

Output Voltage RF section

Ground

10

11

12

13

All

RF_IN

I

GNSS signal input

Ground

All

GND

I

All

GND

I

Ground

NEO-M8N

NEO-M8M

NEO-M8Q

All

ANT_ON

Reserved

ANT_ON

Reserved

O

-

Antenna control

Reserved

14

O

-

Antenna control

Reserved

15

16

17

All

-

Reserved

All

-

Reserved

SDA

SPI CS_N

SCL

SPI CLK

TxD

SPI MISO

RxD

SPI MOSI

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

18

19

20

21

All

I/O

O

Serial Port if D_SEL =1(or open)

SPI MOSI if D_SEL = 0

I

22

23

24

All

V_BCKP

VCC

I

Backup voltage supply

Supply voltage

Ground

GND

Table 5: Pinout

Pins designated Reserved should not be used. For more information about Pinouts see the NEO-M8

Hardware Integration Manual [1].

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Pin Definition

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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-M8N, 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 or left

open, UART and DDC become available. If D_SEL is set low, i.e. connected to ground, the NEO-M8 series

module can communicate to a host via SPI.

D_SEL=”1”

(left open)

D_SEL =”0”

(connected to GND)

PIN #

20

21

19

18

UART TX

UART RX

DDC SCL

DDC SDA

SPI MISO

SPI MOSI

SPI CLK

SPI CS_N

Table 6: Data interface selection by D_SEL

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Configuration management

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NEO-M8 - Data Sheet

4 Electrical specification

The limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress

above one or more of the limiting values may cause permanent damage to the device. These are stress

ratings only and operation of the device at these or at any other conditions above those given in the

characteristics sections of the specification is not implied. Exposure to these limits for extended periods

may affect device reliability.

Where application information is given, it is advisory only and does not form part of the specification. For

more information see the NEO-M8 Hardware Integration Manual [1].

4.1 Absolute maximum rating

Parameter

Symbol

Module

Condition

Min

Max

Units

Power supply voltage

Backup battery voltage

USB supply voltage

Input pin voltage

VCC

All

–0.5

3.6

V

V_BCKP

VDD_USB

Vin

3.6

V

3.6

V

3.6

V

Vin_usb

Ipin

VDD_USB

10

V

DC current trough any digital I/O pin

(except supplies)

mA

VCC_RF output current

Input power at RF_IN

ICC_RF

Prfin

All

100

15

mA

source impedance

= 50 ,

dBm

continuous wave

NEO-M8M

NEO-M8N/M8Q

–40

105

85

°C

Storage temperature

Tstg

Table 7: 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.

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NEO-M8 - Data Sheet

4.2 Operating conditions

All specifications are at an ambient temperature of 25°C. Extreme operating temperatures can

significantly impact specification values. Applications operating near the temperature limits should be

tested to ensure the specification.

Unit

s

Parameter

Symbol

Module

Min

Typical

Max

Condition

Power supply voltage

VCC

NEO-M8M

1.65

3.6

V

NEO-M8N/Q 2.7

3.0

3.3

V

Supply voltage USB

VDDUSB

V_BCKP

I_BCKP

All

3.0

1.4

V

Backup battery voltage

Backup battery current

V

15

µA

V_BCKP = 1.8 V,

VCC = 0 V

SW backup current

I_SWBCKP

NEO-M8M

22

30

µA

V

VCC = 3 V

NEO-M8N/Q

Input pin voltage range

Vin

All

0

VCC

Digital IO Pin Low level input voltage

Digital IO Pin High level input voltage

Digital IO Pin Low level output voltage

Digital IO Pin High level output voltage

Pull-up resistor for RESET_N (internal)

USB_DM, USB_DP

Vil

All

0

0.2*VCC

VCC

V

Vih

All

0.7*VCC

V

Vol

All

0.4

V

Iol = 4mA

Ioh = 4mA

Voh

All

VCC–0.4

V

Rpu

All

11

k

VinU

VCC_RF

ICC_RF

NFtot

All

Compatible with USB with 27 Ω series resistance

VCC_RF voltage

All

VCC–0.1

V

VCC_RF output current

Receiver Chain Noise Figure¹⁴

All

50

85

mA

dB

°C

NEO-M8M

NEO-M8N/Q

All

3.5

2.0

Operating temperature

Topr

–40

Table 8: Operating conditions

Operation beyond the specified operating conditions can affect device reliability.

¹⁴Only valid for the GPS band

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NEO-M8 - Data Sheet

4.3 Indicative current requirements

Table 9 lists examples of the total system supply current for a possible application.

Values in Table 9 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.

Typ

GPS & GLONASS

Typ

GPS / QZSS / SBAS

Parameter

Symbol

Module

Max Units Condition

Max. supply current ¹⁵

Iccp

All

67

mA

Icc Acquisition¹⁸

NEO-M8N

NEO-M8M

NEO-M8Q

NEO-M8N

NEO-M8M

NEO-M8Q

NEO-M8N

NEO-M8M

NEO-M8Q

34

27

19.5

26

24.5

29.5

34

Estimated at 3 V

26.5

17.5

24

Icc Tracking

(Continuous mode)

Average supply current ^{16, 17}

23.5

28.5

n.a.¹⁹

10.5

5

Icc Tracking

(Power Save mode / 1 Hz)

10

Table 9: Indicative power requirements at 3.0 V

For more information about power requirements, see the NEO-M8 Hardware Integration Manual [1].

For more information on how to noticeably reduce current consumption, see the Power Management

Application Note [4].

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:

Symbol

Description

SPI CS_N (SS_N)

SPI CLK (SCK)

Slave select signal

Slave clock signal

Table 10: Symbol description

15

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

¹⁷Simulated GNSS constellation using power levels of -130 dBm. VCC = 3.0 V

¹⁸Average current from start-up until the first fix.

¹⁹Not applicable

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NEO-M8 - Data Sheet

Figure 3: SPI timing diagram

4.4.1 Timing recommendations

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

Parameter

Description

Recommendation

t_INIT

Initialization Time

Deselect Time

500 s

1 ms.

t_DES

Bit rate

1 Mb/s

Table 11: 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

The DDC interface is I²C Fast Mode compliant. For timing parameters consult the I²C standard.

The maximum bit rate is 400 kb/s. The interface stretches the clock when slowed down when serving

interrupts, so real bit rates may be slightly lower.

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NEO-M8 - Data Sheet

5 Mechanical specifications

Figure 4: Dimensions

For information about the paste mask and footprint, see the NEO-M8 Hardware Integration Manual [1].

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Mechanical specifications

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NEO-M8 - Data Sheet

6 Reliability tests and approvals

6.1 Reliability tests

All NEO-M8 series 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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Reliability tests and approvals

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NEO-M8 - Data Sheet

7 Product handling & soldering

7.1 Packaging

The NEO-M8 series 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 series GNSS modules are deliverable in quantities of 250 pcs on a reel. The NEO-M8 receivers are

shipped on Reel Type B, as specified in the u-blox Package Information Guide [3][2].

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-M8 Hardware Integration

Manual [1]).

7.2.3 ESD handling precautions

NEO-M8 series 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:



Unless there is a galvanic coupling between the

local GND (i.e. the work table) and the PCB GND,

then the first point of contact when handling the

PCB must always be between the local GND and

PCB GND.



Before mounting an antenna patch, connect

ground of the device

When handling the RF pin, do not come into

contact with any charged capacitors and be

careful when contacting materials that can

develop charges (e.g. patch antenna ~10 pF, coax

cable ~50-80 pF/m, soldering iron, …)



To prevent electrostatic discharge through the RF

input, do not touch any exposed antenna area. If

there is any risk that such exposed antenna area is

touched in non ESD protected work area,

implement proper ESD protection measures in the

design.

When soldering RF connectors and patch

antennas to the receiver’s RF pin, make sure to

use an ESD safe soldering iron (tip).

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NEO-M8 - Data Sheet

8 Default messages

Interface

Settings

UART Output

9600 Baud, 8 bits, no parity bit, 1 stop bit

Configured to transmit both NMEA and UBX protocols, but only the following NMEA (and no UBX)

messages have been activated at start-up:

GGA, GLL, GSA, GSV, RMC, VTG, TXT

USB Output

UART Input

USB Input

DDC

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, NMEA

The 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.

SPI

Allow communication to a host CPU, operated in slave mode only. Default messages activated. SPI is not

available in the default configuration.

TIMEPULSE

(1 Hz Nav)

1 pulse per second, synchronized at rising edge, pulse length 100ms

Table 12: Default messages

Refer to the u-blox M8 Receiver Description Including Protocol Specification [2] for information about

further settings.

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Default messages

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NEO-M8 - Data Sheet

9 Labeling and ordering information

9.1 Product labeling

The labeling of u-blox M8 GNSS modules includes important product information. The location of the 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 Code

includes options and quality, while the Type Number includes the hardware and firmware versions. Table 13

shows the structure of these three different formats.

Format

Structure

Product Name

Ordering Code

Type Number

PPP-TGV

PPP-TGV-T

PPP-TGV-T-XX

Table 13: Product Code Formats

The parts of the product code are explained in Table 14.

Code

Meaning

Example

PPP

TG

V

Product Family

Platform

NEO

M8 = u-blox M8

Variant

Function set (A-Z), T = Timing, R = DR, etc.

T

Option / Quality Grade

Describes standardized functional element or quality grade

0 = Default variant, A = Automotive

XX

Product Detail

Describes product details or options such as hard- and software revision, cable length, etc.

Table 14: part identification code

9.3 Ordering codes

Ordering No.

Product

NEO-M8M-0

NEO-M8N-0

NEO-M8Q-0

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

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

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

Table 15: 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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Labeling and ordering information

Page 24 of 26

NEO-M8 - Data Sheet


型号：	NEO-M8N
厂家：	u-blox AG
描述：	u-blox M8 concurrent GNSS modules
文件：	总26页 (文件大小：1286K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

NEO-M8N [U-BLOX]

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NEOLINK-2012T

NEOLINK-6211R-Y

NEOLINK-6211T-Y

NEOLINK-8011R-Y

NEOLINK-8011T-Y

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