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Quectel_L76K_Hardware_Design_V1.0(Quectel_L76K_Hardware_Design_V1.0).pdf
Safety Information
About the Document
Contents
Table Index
Figure Index
1 Product Description
1.1. Overview
1.2. Features
1.3. Performance
1.4. Block Diagram
1.5. GNSS Constellations
1.5.1. GPS
1.5.2. GLONASS
1.5.3. BeiDou
1.5.4. QZSS
1.6. AGNSS
2 Pin Assignment
3 Power Management
3.1. Power Unit
3.2. Power Supply
3.2.1. VCC
3.2.2. V_BCKP
3.3. Power Mode
3.3.1. Feature Comparison
3.3.2. Continuous Mode
3.3.3. Standby Mode
3.3.4. Backup Mode
3.4. Power-Up Sequence
3.5. Power-Down Sequence
4 Application Interfaces
4.1. IO
4.1.1. Communication Interfaces
4.1.1.1. UART Interface
4.1.2. SET
4.1.3. 1PPS
4.2. System Pins
4.2.1. RESET_N
4.2.2. WAKEUP
5 Design
5.1. Recommended Footprint
5.2. Antenna Reference Design
5.2.1. Antenna Specifications
5.2.2. Antenna Selection Guide
5.2.3. Active Antenna Reference Design
5.2.3.1. Active Antenna Reference Design with Antenna Detection
5.2.3.2. Active Antenna Reference Design without Antenna Detection
5.2.4. Passive Antenna Reference Design
5.3. Coexistence with Cellular Systems
5.3.1. In-Band Interference
5.3.2. Out-of-Band Interference
5.3.3. Ensuring Interference Immunity
6 Electrical Specification
6.1. Absolute Maximum Ratings
6.2. Recommended Operating Conditions
6.3. ESD Protection
7 Mechanical Dimensions
7.1. Top, Side and Bottom View Dimensions
7.2. Top and Bottom Views
8 Product Handling
8.1. Packaging
8.1.1. Carrier Tape
8.1.2. Plastic Reel
8.1.3. Packaging Process
8.2. Storage
8.3. Manufacturing and Soldering
9 Labelling Information
10 Appendix References
L76K Hardware Design
GNSS Module Series
Version: 1.0
Date: 2021-10-20
Status: Released
GNSS Module Series
At Quectel, our aim is to provide timely and comprehensive services to our customers. If you
require any assistance, please contact our headquarters:
Quectel Wireless Solutions Co., Ltd.
Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai
200233, China
Tel: +86 21 5108 6236
Email: info@quectel.com
Or our local offices. For more information, please visit:
http://www.quectel.com/support/sales.htm.
For technical support, or to report documentation errors, please visit:
http://www.quectel.com/support/technical.htm.
Or email us at: support@quectel.com.
Legal Notices
We offer information as a service to you. The provided information is based on your requirements and we
make every effort to ensure its quality. You agree that you are responsible for using independent analysis
and evaluation in designing intended products, and we provide reference designs for illustrative purposes
only. Before using any hardware, software or service guided by this document, please read this notice
carefully. Even though we employ commercially reasonable efforts to provide the best possible
experience, you hereby acknowledge and agree that this document and related services hereunder are
provided to you on an “as available” basis. We may revise or restate this document from time to time at
our sole discretion without any prior notice to you.
Use and Disclosure Restrictions
License Agreements
Documents and information provided by us shall be kept confidential, unless specific permission is
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Our and third-party products hereunder may contain copyrighted material. Such copyrighted material
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noncompliance with abovementioned requirements, unauthorized use, or other illegal or malicious use of
the material.
L76K_Hardware_Design 1 / 48
GNSS Module Series
Trademarks
Except as otherwise set forth herein, nothing in this document shall be construed as conferring any rights
to use any trademark, trade name or name, abbreviation, or counterfeit product thereof owned by Quectel
or any third party in advertising, publicity, or other aspects.
Third-Party Rights
This document may refer to hardware, software and/or documentation owned by one or more third parties
(“third-party materials”). Use of such third-party materials shall be governed by all restrictions and
obligations applicable thereto.
We make no warranty or representation, either express or implied, regarding the third-party materials,
including but not limited to any implied or statutory, warranties of merchantability or fitness for a particular
purpose, quiet enjoyment, system integration, information accuracy, and non-infringement of any
third-party intellectual property rights with regard to the licensed technology or use thereof. Nothing herein
constitutes a representation or warranty by us to either develop, enhance, modify, distribute, market, sell,
offer for sale, or otherwise maintain production of any our products or any other hardware, software,
device, tool, information, or product. We moreover disclaim any and all warranties arising from the course
of dealing or usage of trade.
Disclaimer
a) We acknowledge no liability for any injury or damage arising from the reliance upon the information.
b) We shall bear no liability resulting from any inaccuracies or omissions, or from the use of the
information contained herein.
c) While we have made every effort to ensure that the functions and features under development are
free from errors, it is possible that they could contain errors, inaccuracies, and omissions. Unless
otherwise provided by valid agreement, we make no warranties of any kind, either implied or express,
and exclude all liability for any loss or damage suffered in connection with the use of features and
functions under development, to the maximum extent permitted by law, regardless of whether such
loss or damage may have been foreseeable.
d) We are not responsible for the accessibility, safety, accuracy, availability, legality, or completeness of
information, advertising, commercial offers, products, services, and materials on third-party websites
and third-party resources.
Copyright © Quectel Wireless Solutions Co., Ltd. 2021. All rights reserved.
L76K_Hardware_Design 2 / 48
GNSS Module Series
Safety Information
The following safety precautions must be observed during all phases of operation, such as usage, service,
or repair of any terminal or mobile incorporating the module. Manufacturers of the terminal should notify
users and operating personnel of the following safety information by incorporating these guidelines into all
product manuals. Otherwise, Quectel assumes no liability for customers’ failure to comply with these
precautions.
Ensure that the product may be used in the country and the required environment,
as well as that it conforms to the local safety and environmental regulations.
Keep away from explosive and flammable materials. The use of electronic
products in extreme power supply conditions and locations with potentially
explosive atmospheres may cause fire and explosion accidents.
The product must be powered by a stable voltage source, and the wiring shall
conform to security precautions and fire prevention regulations.
Proper ESD handling procedures must be followed throughout the mounting,
handling and operation of any devices and equipment that incorporate the module
to avoid ESD damages.
L76K_Hardware_Design 3 / 48
GNSS Module Series
About the Document
Document Information
Title
L76K Hardware Design
Subtitle
GNSS Module Series
Document Type
Hardware Design
Document Status
Released
Revision History
Version Date
Description
-
2021-10-20 Creation of the document
1.0
2021-10-20
First official release
L76K_Hardware_Design 4 / 48
GNSS Module Series
Contents
Safety Information ....................................................................................................................................... 3
About the Document ................................................................................................................................... 4
Contents ....................................................................................................................................................... 5
Table Index ................................................................................................................................................... 7
Figure Index ................................................................................................................................................. 8
1 Product Description ............................................................................................................................. 9
1.1. Overview.................................................................................................................................... 9
1.2.
1.3.
1.4.
Features .................................................................................................................................... 9
Performance ............................................................................................................................ 11
Block Diagram ......................................................................................................................... 12
1.5. GNSS Constellations .............................................................................................................. 12
1.5.1. GPS ................................................................................................................................ 13
1.5.2. GLONASS ...................................................................................................................... 13
1.5.3. BeiDou ............................................................................................................................ 13
1.5.4. QZSS .............................................................................................................................. 13
1.6.
AGNSS .................................................................................................................................... 13
2 Pin Assignment .................................................................................................................................. 14
3 Power Management ........................................................................................................................... 17
3.1.
3.2.
Power Unit ............................................................................................................................... 17
Power Supply .......................................................................................................................... 18
3.2.1. VCC ................................................................................................................................ 18
3.2.2. V_BCKP ......................................................................................................................... 18
3.3.
Power Mode ............................................................................................................................ 19
3.3.1. Feature Comparison ...................................................................................................... 19
3.3.2. Continuous Mode ........................................................................................................... 20
3.3.3. Standby Mode ................................................................................................................ 20
3.3.4. Backup Mode ................................................................................................................. 20
3.4.
3.5.
Power-Up Sequence ............................................................................................................... 21
Power-Down Sequence .......................................................................................................... 22
4 Application Interfaces ....................................................................................................................... 23
4.1.
IO ............................................................................................................................................. 23
4.1.1. Communication Interfaces ............................................................................................. 23
4.1.1.1. UART Interface ...................................................................................................... 23
4.1.2. SET................................................................................................................................. 24
4.1.3.
1PPS .............................................................................................................................. 24
4.2.
System Pins ............................................................................................................................ 24
4.2.1. RESET_N ....................................................................................................................... 24
4.2.2. WAKEUP ........................................................................................................................ 25
5 Design ................................................................................................................................................. 26
L76K_Hardware_Design 5 / 48
GNSS Module Series
5.1.
5.2.
Recommended Footprint ......................................................................................................... 26
Antenna Reference Design ..................................................................................................... 27
5.2.1. Antenna Specifications................................................................................................... 27
5.2.2. Antenna Selection Guide ............................................................................................... 27
5.2.3. Active Antenna Reference Design ................................................................................. 28
5.2.3.1. Active Antenna Reference Design with Antenna Detection .................................. 28
5.2.3.2. Active Antenna Reference Design without Antenna Detection ............................. 29
5.2.4. Passive Antenna Reference Design .............................................................................. 30
5.3.
Coexistence with Cellular Systems ......................................................................................... 30
5.3.1.
In-Band Interference ...................................................................................................... 31
5.3.2. Out-of-Band Interference ............................................................................................... 32
5.3.3. Ensuring Interference Immunity ..................................................................................... 32
6 Electrical Specification ...................................................................................................................... 34
6.1.
6.2.
6.3.
Absolute Maximum Ratings .................................................................................................... 34
Recommended Operating Conditions ..................................................................................... 35
ESD Protection ........................................................................................................................ 36
7 Mechanical Dimensions .................................................................................................................... 37
7.1.
7.2.
Top, Side and Bottom View Dimensions ................................................................................ 37
Top and Bottom Views ............................................................................................................ 38
8 Product Handling ............................................................................................................................... 39
8.1.
Packaging ................................................................................................................................ 39
8.1.1. Carrier Tape ................................................................................................................... 39
8.1.2. Plastic Reel .................................................................................................................... 40
8.1.3. Packaging Process ........................................................................................................ 40
8.2.
Storage .................................................................................................................................... 41
8.3. Manufacturing and Soldering .................................................................................................. 42
9 Labelling Information ........................................................................................................................ 45
10 Appendix References ........................................................................................................................ 46
L76K_Hardware_Design 6 / 48
GNSS Module Series
Table Index
Table 1: Product Features ............................................................................................................................ 9
Table 2: Product Performance ................................................................................................................... 11
Table 3: I/O Parameter Definition .............................................................................................................. 14
Table 4: Pinout ........................................................................................................................................... 15
Table 5: Feature Comparison in Different Power Modes .......................................................................... 20
Table 6: Recommended Antenna Specifications ....................................................................................... 27
Table 7: Intermodulation Distortion (IMD) Products................................................................................... 31
Table 8: Absolute Maximum Ratings ......................................................................................................... 34
Table 9: Recommended Operating Conditions .......................................................................................... 35
Table 10: Carrier Tape Dimension Table (Unit: mm) ................................................................................. 39
Table 11: Plastic Reel Dimension Table (Unit: mm) .................................................................................. 40
Table 12: Recommended Thermal Profile Parameters ............................................................................. 43
Table 13: Related Documents .................................................................................................................... 46
Table 14: Terms and Abbreviations ........................................................................................................... 46
L76K_Hardware_Design 7 / 48
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