L76 Hardware Design
GNSS Module Series
Rev. L76_Hardware_Design_V1.1
Date: 2013-02-25
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GNSS Module
L76 Hardware Design
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GNSS Module
L76 Hardware Design
About the document
History
Revision
V1.0
V1.1
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Date
Author
Description
2013-02-08
Ray XU
Initial
2013-03-21
L76_Hardware_Design
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Ray XU
1.
2.
3.
4.
Delete PMTK 291 command.
Changed R3 to 100R in Figure 17.
Updated chapter 2.4.
Changed typical voltage of V_BCKP
to 3.3V.
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GNSS Module
L76 Hardware Design
Contents
About the document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 5
Figure Index ................................................................................................................................................. 6
1
Introduction .......................................................................................................................................... 7
2
Product Concept .................................................................................................................................. 8
2.1.
General Description................................................................................................................... 8
2.2.
Key Features ............................................................................................................................. 9
2.3.
Block Diagram ......................................................................................................................... 10
2.4.
Evaluation Board ..................................................................................................................... 10
2.5.
The Module Supports Protocols .............................................................................................. 11
3
Application.......................................................................................................................................... 12
3.1.
Pin Assignment........................................................................................................................ 12
3.2.
Pin Definition ........................................................................................................................... 12
3.3.
Power Supply .......................................................................................................................... 14
3.4.
Operate Mode ......................................................................................................................... 16
3.4.1. Full On Mode .................................................................................................................. 16
3.4.2. Standby Mode ................................................................................................................ 17
3.4.3. Backup Mode ................................................................................................................. 18
3.4.4. Period Mode ................................................................................................................... 20
3.4.5. AlwaysLocateTM Mode ................................................................................................... 22
3.5.
RESET..................................................................................................................................... 23
3.6.
UART Interface ........................................................................................................................ 24
3.7.
EASY Technology.................................................................................................................... 26
3.8.
Multi-tone AIC .......................................................................................................................... 26
3.9.
ANTON .................................................................................................................................... 27
3.10. LOCUS .................................................................................................................................... 27
4
Antenna Interface ............................................................................................................................... 28
4.1.
Antenna Specification ............................................................................................................. 28
4.2.
Recommended Circuit for Antenna ......................................................................................... 29
4.2.1. Active Antenna ............................................................................................................... 29
4.2.2. Passive Antenna ............................................................................................................ 31
5
Electrical, Reliability and Radio Characteristics ............................................................................ 33
5.1.
Absolute Maximum Ratings .................................................................................................... 33
5.2.
Operating Conditions .............................................................................................................. 34
5.3.
Current Consumption .............................................................................................................. 34
5.4.
Electro-static Discharge .......................................................................................................... 35
5.5.
Reliability Test ......................................................................................................................... 36
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GNSS Module
L76 Hardware Design
6
Mechanics ........................................................................................................................................... 37
6.1.
Mechanical View Of The Module ............................................................................................ 37
6.2.
Bottom Dimension and Recommended Footprint ................................................................... 38
6.3.
Top View Of The Module ......................................................................................................... 39
6.4.
Bottom View of the Module ..................................................................................................... 39
7
Manufacturing .................................................................................................................................... 40
7.1.
Assembly and Soldering ......................................................................................................... 40
7.2.
Moisture Sensitivity ................................................................................................................. 41
7.3.
ESD Safe ................................................................................................................................. 41
7.4.
Tape and Reel ......................................................................................................................... 41
7.5.
Ordering Information ............................................................................................................... 42
8
Appendix Reference .......................................................................................................................... 43
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GNSS Module
L76 Hardware Design
Table Index
TABLE 1: FEATURE ............................................................................................................................................ 9
TABLE 2: THE PROTOCOL SUPPORTED BY THE MODULE ......................................................................... 11
TABLE 3: PIN DESCRIPTION ........................................................................................................................... 12
TABLE 4: MODULE STATE SWITCH ................................................................................................................ 16
TABLE 5: DEFAULT CONFIGURATION............................................................................................................ 17
TABLE 6: PMTK COMMAND FORMAT ............................................................................................................ 20
TABLE 7: RECOMMENDED ANTENNA SPECIFICATION ............................................................................... 28
TABLE 8: ABSOLUTE MAXIMUM RATINGS .................................................................................................... 33
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TABLE 9: THE MODULE POWER SUPPLY RATINGS..................................................................................... 34
TABLE 10: THE MODULE CURRENT CONSUMPTION .................................................................................. 34
TABLE 11: THE ESD ENDURANCE TABLE (TEMPERATURE: 25℃, HUMIDITY: 45 %) ............................... 35
TABLE 12: RELIABILITY TEST ......................................................................................................................... 36
TABLE 13: TRAY PACKING .............................................................................................................................. 42
TABLE 14: ORDERING INFORMATION ........................................................................................................... 42
TABLE 15: RELATED DOCUMENTS ................................................................................................................ 43
TABLE 16: TERMS AND ABBREVIATIONS ...................................................................................................... 43
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GNSS Module
L76 Hardware Design
Figure Index
FIGURE 1: BLOCK DIAGRAM .......................................................................................................................... 10
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 12
FIGURE 3: INTERNAL POWER CONSTRUCTION.......................................................................................... 15
FIGURE 4: CURRENT AND CONSUMPTION VERSUS VCC ......................................................................... 15
FIGURE 5: RTC SUPPLY FROM NON-CHARGEABLE BATTERY .................................................................. 19
FIGURE 6: REFERENCE CHARGING CIRCUIT FOR CHARGEABLE BATTERY .......................................... 19
FIGURE 7: SEIKO MS920SE CHARGE AND DISCHARGE CHARACTERISTICS ......................................... 20
FIGURE 8: PERIOD TIMING ............................................................................................................................. 22
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TM
FIGURE 9: ALWAYSLOCATE
MODE ............................................................................................................ 23
FIGURE 10: REFERENCE RESET CIRCUIT USING OC CIRCUIT ................................................................. 24
FIGURE 11: MODULE TIMING ......................................................................................................................... 24
FIGURE 12: CONNECTION OF SERIAL INTERFACES .................................................................................. 25
FIGURE 13: RS-232 LEVEL SHIFT CIRCUIT ................................................................................................... 25
FIGURE 14: REFERENCE DESIGN WITH ACTIVE ANTENNA ....................................................................... 29
FIGURE 15: REFERENCE DESIGN FOR ACTIVE ANTENNA WITH ANTON ................................................. 30
FIGURE 16: REFERENCE DESIGN WITH PASSIVE ANTENNA .................................................................... 31
FIGURE 17: REFERENCE DESIGN FOR PASSIVE ANTENNA WITH LNA .................................................... 32
FIGURE 18: TOP VIEW AND SIDE VIEW(UNIT: MM) ................................................................................. 37
FIGURE 19: BOTTOM DIMENSION(UNIT: MM) .......................................................................................... 38
FIGURE 20: FOOTPRINT OF RECOMMENDATION(UNIT: MM) ................................................................ 38
FIGURE 21: TOP VIEW OF THE MODULE ...................................................................................................... 39
FIGURE 22: BOTTOM VIEW OF THE MODULE .............................................................................................. 39
FIGURE 23: RAMP-SOAK-SPIKE-REFLOW OF FURNACE TEMPERATURE ............................................... 40
FIGURE 24: TAPE AND REEL SPECIFICATION .............................................................................................. 41
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GNSS Module
L76 Hardware Design
1
Introduction
This document defines and specifies L76 GNSS module. It describes L76 GNSS module hardware
interface and its external application reference circuits, mechanical size and air interface.
This document can help you quickly understand the interface specifications, electrical and mechanical
details of L76 GNSS module. We also offer you other documents such as L76 software application notes
and user guider. These documents can ensure you use L76 module to design and set up mobile
applications quickly.
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GNSS Module
L76 Hardware Design
2
Product Concept
2.1. General Description
L76 is a single receiver module integrated with GLONASS and GPS system. It is able to achieve the
industry’s highest level of sensitivity, accuracy and TTFF with the lowest power consumption in a
small-footprint lead-free package. The embedded flash memory provides capacity for storing
user-specific configurations and allows for future updates.
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The L76 GNSS module supports multiple positions and navigation system including autonomous GPS,
GLONASS, SBAS (including WAAS, EGNOS, MSAS and GAGAN), QZSS, and AGPS.
Embedded with many advanced power saving modes including period, AlwaysLocateTM, standby and
backup, L76 GNSS module has excellent low-power consumption in different scenes.
EASY technology as the key feature of L76 is one kind of AGPS. Collecting and processing all internal
aiding information like GPS time, Ephemeris, Last Position etc, the GNSS module will have a fast TTFF in
either Hot or Warm start.
L76 GNSS module is an SMD type module with the compact 10.1mm x 9.7mm x 2.5mm form factor,
which can be embedded in your applications through the 18-pin pads. It provides necessary hardware
interfaces between the module and your board.
The module is fully ROHS compliant to EU regulation.
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GNSS Module
L76 Hardware Design
2.2. Key Features
Table 1: Feature
Feature
Implementation
GNSS
GPS&GLONASS
Power supply
Supply Voltage: 2.8V – 4.3V
typical : 3.3V
Power consumption
Acquisition
Tracking
Acquisition
Tracking
21 mA @ -130dBm(GPS)
15 mA @ -130dBm(GPS)
25 mA @ -130dBm(GPS+GLONASS)
18 mA @ -130dBm(GPS+GLONASS)
Receiver Type
GPS L1 1575.42MHz C/A Code
GLONASS L1 1598.0625~1605.375 C/A Code
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Sensitivity(NOTE)
Time-To-First-Fix
(EASY enabled)
Acquisition
Reacquisition
Tracking
-148dBm
-160dBm
-163dBm
Cold Start
Warm Start
Hot Start
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