Quectel LC79D Supplement

LC79D Hardware Design
GNSS Module Series
Rev. LC79D_Hardware_Design_V1.0
Date: 2019-11-14
Status: Released
www.quectel.com

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About the Document
History
Revision
Date
Author
Description
1.0
2019-11-14
Brooke WANG/
Phil GAO
Initial

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Contents
About the Document.................................................................................................................................. 2
Contents...................................................................................................................................................... 3
Table Index.................................................................................................................................................. 5
Figure Index................................................................................................................................................ 6
1Introduction......................................................................................................................................... 7
1.1. Safety Information...................................................................................................................... 7
2Product Concept................................................................................................................................. 8
2.1. General Description................................................................................................................... 8
2.2. Product Variants......................................................................................................................... 9
2.2.1. UDR Technology.............................................................................................................9
2.3. Key Features............................................................................................................................ 10
2.4. Block Diagram.......................................................................................................................... 11
2.5. Evaluation Board...................................................................................................................... 12
2.6. Supported Protocols ................................................................................................................ 12
3Application Interfaces ...................................................................................................................... 14
3.1. Pin Assignment........................................................................................................................ 14
3.2. Pin Description......................................................................................................................... 15
3.3. Power Supply........................................................................................................................... 18
3.4. Operation Modes...................................................................................................................... 19
3.4.1. Full on Mode..................................................................................................................19
3.4.2. Sleep Mode...................................................................................................................20
3.4.3. Standby Mode...............................................................................................................20
3.5. UART Interface ........................................................................................................................ 21
3.6. SPI Interface ............................................................................................................................ 22
3.7. I2C Interface*........................................................................................................................... 23
3.8. Boot Interface........................................................................................................................... 24
4Antenna Interfaces............................................................................................................................ 26
4.1. Antenna Specifications ............................................................................................................ 26
4.2. Recommended Antenna Reference Designs.......................................................................... 27
4.2.1. Antenna Selection Guide..............................................................................................27
4.2.1. Active Antenna Reference Design................................................................................ 27
4.2.2. Passive Antenna Reference Design............................................................................. 28
5Electrical, Reliability and Radio Characteristics........................................................................... 30
5.1. Absolute Maximum Ratings..................................................................................................... 30
5.2. Operating Conditions............................................................................................................... 31
5.3. Current Consumption............................................................................................................... 31
5.4. ESD Protection......................................................................................................................... 31
6Mechanical Dimensions................................................................................................................... 33

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6.1. Mechanical Dimensions of the Module.................................................................................... 33
6.2. Recommended Footprint ......................................................................................................... 35
6.3. Top and Bottom Views............................................................................................................. 36
7Storage, Manufacturing, and Packaging........................................................................................ 37
7.1. Storage..................................................................................................................................... 37
7.2. Manufacturing and Soldering................................................................................................... 38
7.3. Tape and Reel Packaging........................................................................................................ 39
8Appendix A References.................................................................................................................... 41

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Table Index
TABLE 1: BANDS AND CONSTELLATIONS OF LC79D ................................................................................... 8
TABLE 2: KEY DIFFERENCES BETWEEN LC79D (A) AND LC79D (B)........................................................... 9
TABLE 3: KEY FEATURES............................................................................................................................... 10
TABLE 4: SUPPORTED PROTOCOLS............................................................................................................ 12
TABLE 5: I/O PARAMETERS DEFINITION...................................................................................................... 15
TABLE 6: PIN DESCRIPTION........................................................................................................................... 15
TABLE 7: DEFAULT CONFIGURATIONS........................................................................................................ 19
TABLE 8: WORKING MODES .......................................................................................................................... 24
TABLE 9: RECOMMENDED ANTENNA SPECIFICATIONS............................................................................ 26
TABLE 10: ABSOLUTE MAXIMUM RATINGS ................................................................................................. 30
TABLE 11: POWER SUPPLY RATINGS .......................................................................................................... 31
TABLE 12: CURRENT CONSUMPTION........................................................................................................... 31
TABLE 13: RECOMMENDED THERMAL PROFILE PARAMETERS .............................................................. 38
TABLE 14: PACKAGING SPECIFICATIONS.................................................................................................... 40
TABLE 15: RELATED DOCUMENTS ............................................................................................................... 41
TABLE 16: TERMS AND ABBREVIATIONS..................................................................................................... 41

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Figure Index
FIGURE 1: BLOCK DIAGRAM.......................................................................................................................... 12
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 14
FIGURE 3: VCC INPUT REFERENCE CIRCUIT.............................................................................................. 18
FIGURE 4: INTERNAL POWER SYSTEM CONSTRUCTION.......................................................................... 19
FIGURE 5: REFERENCE CIRCUIT FOR NSTANDBY..................................................................................... 21
FIGURE 6: REFERENCE DESIGN OF UART INTERFACE............................................................................. 22
FIGURE 7: REFERENCE DESIGN OF SPI INTERFACE................................................................................. 23
FIGURE 8: BOOT PIN STATE (NORMAL WORKING MODE)......................................................................... 24
FIGURE 9: BOOT PIN CONTROL SEQUENCE (HOST MODE) ..................................................................... 24
FIGURE 10: REFERENCE DESIGN FOR ACTIVE ANTENNA........................................................................ 28
FIGURE 11: REFERENCE DESIGN FOR PASSIVE ANTENNA ..................................................................... 28
FIGURE 12: TOP AND SIDE DIMENSIONS..................................................................................................... 33
FIGURE 13: BOTTOM DIMENSIONS............................................................................................................... 34
FIGURE 14: RECOMMENDED FOOTPRINT................................................................................................... 35
FIGURE 15: TOP VIEW OF THE MODULE...................................................................................................... 36
FIGURE 16: BOTTOM VIEW OF THE MODULE.............................................................................................. 36
FIGURE 17: RECOMMENDED REFLOW SOLDERING THERMAL PROFILE ............................................... 38
FIGURE 18: TAPE AND REEL SPECIFICATIONS .......................................................................................... 40

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1Introduction
This document provides information on the interface specifications, electrical and mechanical details, as
well as other related information of Quectel LC79D GNSS module. To facilitate application designs, it also
includes some reference designs for customers’ reference. This document, coupled with application notes
and user guides, makes it easy to design applications with LC79D module.
1.1. Safety Information
The following safety precautions must be observed during all phases of operation, such as usage, service
or repair of any terminal incorporating Quectel LC79D module. Manufacturers of the terminal should notify
users and operating personnel of the following safety information by incorporating these guidelines into all
manuals supplied with the product. If not so, Quectel assumes no liability for any user’s failure to observe
these precautions.
Ensure that the use of the product meets the national safety and environmental
regulations, and is allowed in the country and in the environment required.
Keep awayfrom 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 hazards.
The product has to be powered by a stabilized voltage source, and the wiring shall
conform to security and fire prevention regulations.
Proper ESD handling procedures must be applied throughout the mounting,
handling and operation of any application that incorporates the module to avoid
ESD damages.

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2Product Concept
2.1. General Description
LC79D is a dual-band and multi-constellation GNSS module. It supports L1 and L5 bands for GPS, Galileo
and QZSS, L1 band for GLONASS and BeiDou as well as L5 band for IRNSS, and more specific
information is available in the table below. It can achieve high industrial level of sensitivity and accuracy
with the lowest power consumption in an ultra-small footprint.
LC79D is a SMD type module with an ultra-compact form factor of 10.1mm ×9.7mm ×2.4mm. It can be
embedded into terminals through its 18 LCC pins and 10 LGA pins. This document provides necessary
hardware interfaces for connection with the motherboard of terminals.
The module is fully compliant with EU RoHS directive.
Table 1: Bands and Constellations of LC79D
GPS/QZSS
L1 C/A
L1C
L2C
L5
L6

/
/

/
Galileo
E1
E5a
E5b
E6


/
/
BeiDou
B1I
B1C
B2I
B2a
B3I

/
/
/
/
GLONASS
L1OF
L2OF

/
IRNSS
L5

SBAS
L1


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“●” means supported.
2.2. Product Variants
Due to supporting of different working modes, LC79D is classified into two variants:
LC79D (A), supporting standalone mode, has a built-in flash and it boots firmware from the flash, so
it can work independently.
LC79D (B), supporting host mode, does not include a built-in flash, so it cannot work independently
and has to boot firmware from an Android device. Through the Quectel UDR (Untethered Dead
Reckoning) technology working on Android devices, the positioning information provided by the
module and that from a 6-axis sensor will be combined to provide vehicles with continuous and
accurate positioning.
Table 2: Key Differences between LC79D (A) and LC79D (B)
2.2.1. UDR Technology
UDR refers to the capability of a GNSS receiver to continuously navigate on a vehicle when there are
insufficient GNSS satellite signals available. To realize this function, the receiver uses the information
provided by external sensors concerning the state of the vehicle to propagate the navigation solution.With
this combined system, the sensor’s inputs will help smooth the navigation trace when the satellite signals
are partially or completely blocked, while the satellite signals will then provide updates and corrections for
sensor drifts. With UDR technology, the system will get continuous and high accuracy positioning in
environments such as tunnels and urban canyons.
Module
Interfaces
Embedded Flash
UDR Technology Working on
Android Devices
LC79D (A)
UART, I2C, BOOT
Support
N/A
LC79D (B)
SPI, I2C, BOOT
N/A
Support
NOTE

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2.3. Key Features
Table 3: Key Features
Features
Details
Supported Bands1)
GPS L1 C/A (1574.397MHz ~ 1576.443MHz)
BeiDou B1 C/A (1559.052MHz ~ 1563.144MHz)
GLONASS L1 OF (1597.781MHz ~ 1605.656MHz)
Galileo E1 OS (1573.374MHz ~ 1577.466MHz)
GPS L5 (1166.22MHz ~ 1186.68MHz)
IRNSS L5 (1175.427MHz ~ 1177.473MHz)
Galileo E5a (1166.22MHz ~ 1186.68MHz)
Power Supply
VCC: 1.7V~1.9V, typical 1.8V
Power Consumption
(GPS+BeiDou+GLONASS+
Galileo+QZSS+IRNSS)
Acquisition: 47mA
Tracking: 43mA
Sleep mode: 200μA
Standby mode: 17μA
Sensitivity (GPS+GLONASS)
Acquisition: -147dBm
Reacquisition: -158dBm
Tracking: -163dBm
Sensitivity (IRNSS only)
Acquisition: -144dBm
Reacquisition: -151dBm
Tracking: -155dBm
TTFF (without AGNSS)
Cold start: <34s
Warm start: <30s
Hot start: <2s
TTFF (with AGNSS)
Cold Start: <5s
Horizontal Position Accuracy
(Autonomous)
<1.2m CEP @-130dBm
Update Rate
1Hz
Accuracy of 1PPS Signal
Typical accuracy: <100ns
Time pulse width: 5ms
Velocity Accuracy
Without aid: <0.1m/s
Acceleration Accuracy
Without aid: <0.1m/s²
Dynamic Performance
Maximum Altitude: 18000m
Maximum Velocity: 515m/s
Acceleration: 4g

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1) The default GNSS configuration of LC79D is GPS+BeiDou+GLONASS+Galileo+QZSS+IRNSS. For
more details about the GNSS configuration, please refer to document [1].
2.4. Block Diagram
The following figure shows the block diagram of LC79D module. The module includes a single-chip GNSS
IC, two LNAs, two SAW filters, a diplexer, a flash (for LC79D (A) only), a TCXO and a crystal oscillator.
The diplexer integrates a band-pass filter inside which can improve the out-of-band rejection. Thus the
LNAs will have less chance to produce in-band interference in challenging environments (with a cellular
module transmitting B13 at the same time for example), and provide LC79D with better performance in
anti-jamming.
UART Interface
One UART interface for LC79D (A) Support baud rate from
115200bps to 921600bps; 115200bps by default
UART port is used for NMEA output and firmware upgrade
SPI Interface
One SPI interface for LC79D (B)
Operate as a slave
Fixed data frame size of 8 bits
I2C Interface
One I2C interface, working on master mode
Support Standard mode (100kbps), Fast mode (400kbps), Fast
mode Plus (1Mbps), and High-Speed mode (3.4Mbps)
Support 7-bit and 10-bit addresses
Temperature Range
Operation temperature range: -40°C to +85°C
Storage temperature range: -40°C to +90°C
Physical Characteristics
Size: (10.1±0.15)mm ×(9.7±0.15)mm ×(2.4±0.20)mm
Weight: approx. 0.42g
NOTE

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PMU
RAM
32KB
RF Front
End
Integrated
LNA
Flash
2MB
GNSS High-
Sensitivity
Measurement
Engine
1PPS
I2C
NSTANDBY
UART/SPI
TCXO
26M
RF_IN
LNA_EN
BOOT
RDY
REQ
AP_REQ
INT
SAW
Filter
SAW
Filter
CPU
ARM Cortex-M4F
ARM CPU Cortex-
M0
(low power)
SRAM
1.125MB ROM 1MB
32.768K
LC79D
RTC
VCC
VCC_RF
CPU
ARM Cortex-M0
(low power)
L5 L1
LNA
DIP
LNA
XTAL
LC79D (A) only
Figure 1: Block Diagram
2.5. Evaluation Board
In order to facilitate application development with LC79D, Quectel supplies an evaluation board (LC79D
EVB) with a Micro-USB cable, an active antenna andother peripherals to test the module. Formore details,
please refer to document [2] and document [3].
2.6. Supported Protocols
Table 4: Supported Protocols
Protocol
Type
NMEA
ASCII, 0183, 4.11
PQ
Quectel proprietary protocols

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Please refer to document [1] for more details.
NOTE

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3Application Interfaces
LC79D is designed with 28 pins (18 LCCpins and 10LGA pins) through which the module can bemounted
to the motherboard of any terminal.
3.1. Pin Assignment
TXD/SPI_CLK
GND
24
BOOT
RESERVED
RESERVED
GND
RXD/SPI_CS
1PPS
NSTANDBY
RESERVED
VCC
RESERVED
RESERVED
I2C_SCL
INT
I2C_SDA
RESERVED
VCC_RF
RF_IN
GND
LNA_EN
GND
RTS/SPI_MISO
REQ RDY
RESERVED
AP_REQ
CTS/SPI_MOSI
9
1
2
3
4
5
6
7
8
10
18
17
16
15
14
13
12
11
25 26 27 28
19202122
23
LC79D
Top View
GNDPOWER RESERVEDGPIO BOOT ANT
Figure 2: Pin Assignment

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1. Keep all unused and RESERVED pins open.
2. LC79D (A) does not support RDY feature, please keep this pin open while designing.
3.2. Pin Description
Table 5: I/O Parameters Definition
Table 6: Pin Description
Type
Description
AI
Analog Input
AO
Analog Output
DI
Digital Input
DO
Digital Output
IO
Bidirectional
OD
Open Drain
PI
Power Input
PO
Power Output
Power Supply
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
VCC
8
PI
Main power supply
Vmax=1.9V
Vmin=1.7V
Vnom=1.8V
Ensure the load
current not less than
100mA.
VCC_RF
14
PO
Power supply for
external RF
components
VCC_RF≈VCC:
Vmax=1.9V
Vmin=1.7V
Vnom=1.8V
Typically used to
supply power for an
external active
antenna or LNA.
If unused, keep this
pin open.
NOTES

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Standby Mode Control
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
NSTANDBY
5
DI
Standby mode
control
VILmin=-0.3V
VILmax=0.35×VCC
VIHmin=0.65×VCC
VIHmax=VCC+0.3V
Active low.
Pulled up by default.
UART/SPI Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
TXD/
SPI_CLK
2
DO/DI
Transmit data/
SPI clock
VOLmax=0.4V
VOHmin=VCC-0.45V
VOHnom=1.8V
VILmin=-0.3V
VILmax=0.35×VCC
VIHmin=0.65×VCC
VIHmax=VCC+0.3V
LC79D (A): UART
LC79D (B): SPI
RXD/
SPI_CS
3
DI/DO
Receive data/
SPI chip select
RTS/
SPI_MISO
22
DO
Request to send/
SPI master in
salve out
CTS/
SPI_MOSI
23
DI
Clear to send/
SPI master out
slave in
RF Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RF_IN
11
AI
RF signal input
50Ω characteristic
impedance.
I2C Interface*
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
I2C_SDA
16
OD
I2C serial data
VILmax=0.35×VCC
VIHmin=0.65×VCC
VOLmax=0.4V
VOHmin= VCC-0.45V
VOHnom=1.8V
Require external pull-
up to 1.8V.
If unused, keep
these pins open.
I2C_SCL
17
OD
I2C serial clock
INT
18
DI
External interrupt
input
VILmin=-0.3V
VILmax=0.35×VCC
VIHmin=0.65×VCC
VIHmax=VCC+0.3V
If unused, keep this
pin open.
Other Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment

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1PPS
4
DO
One pulse per
second
VOLmax=0.4V
VOHmin=VCC-0.45V
VOHnom=1.8V
Synchronized on
rising edge, and the
pulse width is 5ms.
If unused, keep this
pin open.
BOOT
25
DI
Module startup
mode control
VILmin=-0.3V
VILmax=0.35×VCC
VIHmin=0.65×VCC
VIHmax=VCC+0.3V
While keeping the
pin floating during
startup, the module
will enter normal
working mode.
While keeping the
pin at high level for
about 100ms during
startup, the module
will enter host mode.
LNA_EN
13
DO
Active antenna
power control in
standby mode
VOLmax=0.4V
VOHmin=VCC-0.45V
VOHnom=1.8V
If unused, keep this
pin open.
GND
1, 10,
12, 28
GND
All GND pins should
be connected to
ground.
RESERVED
6, 7, 9,
15, 24,
26, 27
RESERVED
Keep them open.
Host Mode Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
REQ
21
DO
Data availability
indication, used to
indicate whether
there is data
available for
reading
VOLmax=0.4V
VOHmin=VCC-0.45V
VOHnom=1.8V
High level: there is
data available for
reading.
Low level: no data is
available for reading.
AP_REQ
19
DI
AP request
to send
VILmin=-0.3V
VILmax=0.35×VCC
VIHmin=0.65×VCC
VIHmax=VCC+0.3V
High level: notify the
module that the AP
has data to be sent.
Low level: data
transfer has been
completed.
RDY
20
DO
Module status
indication, used to
indicate whether
the module is
VOLmax=0.4V
VOHmin=VCC-0.45V
VOHnom=1.8V
RDY is used in
conjunction with
AP_REQ and is a
status/ready signal

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1. Please keep unused and RESERVED pins open.
2. “*” means under development.
3.3. Power Supply
VCC supplies power for BB, RF, flash and RTC domains. The load current of VCC varies according to the
VCC voltage level, processor load and satellite acquisition.
It is recommended to select an LDO with minimum output current of 100mA as the power supply, and add
a decoupling capacitor combination (10μF and 100nF) as well as a TVS near the VCC pin. It is strongly
discouraged to use a pulse frequency modulation regulator for power supply.
PMU
VCC
10μF100nF
Module
TVS
ESD5651N
Figure 3: VCC Input Reference Circuit
ready for
communication
with the AP
when AP_REQ is
driven high.
Low level: the
module is in sleep
mode and is not
ready to
communicate with
the AP.
High level: the
module is awake and
ready to
communicate with
the AP.
NOTES

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The construction of the module’s internal power system is illustrated as below.
VCC(1.7~1.9V)
LNAs PMU CPU RTC logic Flash
VCC_RF
LC79D (A) only
Figure 4: Internal Power System Construction
3.4. Operation Modes
3.4.1. Full on Mode
Full on mode comprises tracking mode and acquisition mode. In acquisition mode, the module starts to
search satellites, and to determine the visible satellites, coarse carrier frequency as well as code phase of
satellite signals.When theacquisition is completed, it will automaticallyswitch to tracking mode.In tracking
mode, the module tracks satellites and demodulates the navigation data from specific satellites.
When the module is powered on, it will enter full on mode automatically and follow the default
configurations as below.
Table 7: Default Configurations

GGA, RMC, GSA and GSV are the output types of NMEA messages supported by LC79D:
GGA: Global Positioning System Fix Data
RMC: Recommended Minimum Specific GNSS Data
Item
Configuration
Comment
Baud Rate
115200bps
Protocol
NMEA
GGA, RMC, GSA, GSV, GLL and VTG
Update Rate
1Hz
GNSS
GPS+BeiDou+GLONASS
+Galileo+QZSS+IRNSS
NOTE