Mobiletek Lynq L710HG User manual

L710HG EVB User Manual
Version：V1.2
Date：2021-01-19
Shanghai Mobiletek Communication Ltd

L710HG EVB User Manual
Copyright© Shanghai Mobiletek Communication Ltd 1
Notice
Some features of the product and its accessories described herein rely on the software installed,
capacities and settings of local network, and therefore may not be activated or may be limited by
local network operators or network service providers.
Thus, the descriptions herein may not exactly match the product or its accessories which you
purchase.Shanghai Mobiletek Communication Ltd reserves the right to change or modify any
information or specifications contained in this manual without prior notice and without any
liability.
Copyright
This document contains proprietary technical information which is the property of Shanghai
Mobiletek Communication Ltd. copying of this document and giving it to others and the using or
communication of the contents thereof, are forbidden without express authority. Offenders are
liable to the payment of damages. All rights reserved in the event of grant of patent or the
registration of a utility model or design. All specification supplied herein are subject to change
without notice at any time.
DISCLAIMER
ALL CONTENTS OF THIS MANUAL ARE PROVIDED “AS IS”. EXCEPT AS REQUIRED
BY APPLICABLE LAWS, NO WARRANTIES OF ANY KIND, EITHER EXPRESS OR
IMPLIED, INCLUDINGBUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE MADE IN
RELATION TO THE ACCURACY, RELIABILITY OR CONTENTS OF THIS MANUAL.
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL
SHANGHAI MOBILETEKCOMMUNICATION LTD BE LIABLE FOR ANY SPECIAL,
INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, OR LOSS OF PROFITS,
BUSINESS, REVENUE, DATA, GOODWILL SAVINGS OR ANTICIPATED SAVINGS
REGARDLESS OF WHETHER SUCH LOSSES ARE FORSEEABLE OR NOT.

L710HG EVB User Manual
Copyright© Shanghai Mobiletek Communication Ltd 2
Version History
Date Version Description of change
Author
2019-08-8 V1.0 Initial
2019-11-23 V1.1 Adjust layout
2021-01-19 V1.2 Fixed display error

FCC Caution:
(1)Exposure to Radio Frequency Radiation. This equipment must be installed and operated in accordance
with provided instructions and the antenna(s) used for this transmitter must be installed to provide a
separation distance of at least 20 cm from all persons and must not be collocated or operating in
conjunction with any other antenna or transmitter. End-users and installers must be provided with
antenna installation instructions and transmitter operating conditions for satisfying RF exposure
compliance.
(2) Any changes or modifications not expressly approved by the grantee of this device could void the
user's authority to operate the equipment.
(3) This Transmitter must not be co-located or operating in conjunction with any other antenna or
transmitter.
(4) Labelling requirements:This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired operation.
(5) if the host is marketed so that end users do not have straight forward commonly used methods for
access to remove the module so that the FCC ID of the module is visible; then an additional permanent
label referring to the enclosed module: Contains Transmitter Module FCC ID: 2AK9D-L710HG or
Contains FCC ID: L710HG must be used.
This Modular Approval is limited to OEM installation for mobile and fixed applications
only. The antenna installation and operating configurations of this Modular, including any
applicable source-based timeaveraging duty factor, antenna gain and cable loss must satisfy
MPE categorical Exclusion Requirements of 2.1091.
FCC §15.105 Note:
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in
a particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
—Consult the dealer or an experienced radio/TV technician for help.

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Copyright© Shanghai Mobiletek Communication Ltd 3
Contents
1 ABOUT THIS DOCUMENT ..........................................................................5
1.1 Scope of applications ........................................................................................................................5
1.2 Writing purpose ................................................................................................................................5
1.3 Support and reference documentation list .....................................................................................6
1.4 Abbreviations ....................................................................................................................................6
2 ABSTRACT ..................................................................................................8
3 POWER SUPPLY .........................................................................................9
4 KEY DESCRIPTION ...................................................................................10
4.1 Power on/off and RESET key........................................................................................................10
4.2 FORCED USB download key........................................................................................................ 10
4.3 WATCHDOG key ........................................................................................................................... 11
5 APPLICATION INTERFACE.......................................................................12
5.1 UART DB9 Interface......................................................................................................................12
5.2 USB（AT UART）Interface..........................................................................................................12
5.3 USB（DEBUG UART）Interface.................................................................................................13
5.4 USB 2.0 Interface............................................................................................................................13
5.5 SIM Card Interface ........................................................................................................................ 14
5.6 Headset Interface............................................................................................................................14
5.7 Antenna interface............................................................................................................................15
5.8 Audio interface（TBD）................................................................................................................15
5.9 LED indicating lamp ......................................................................................................................17
5.10 The others......................................................................................................................................18

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6 ACCESSORIES AND ASSEMBLY.............................................................21
6.1 EVB Assembly................................................................................................................................. 21
6.2 EVB Accessory................................................................................................................................22
6.3 Driver install ...................................................................................................................................23
6.4 Dial configuration...........................................................................................................................26

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1 About this document
1.1 Scope of applications
This document describes the basic specifications of the L710HG IoT Module EVB (hereinafter referred to
as the L710HG) series product electrical characteristics, design guidance and hardware interface
development guidance. Users should design according to this document requirement and guidance.
This document is only applicable to the application development of L710HG series products.
1.2 Writing purpose
This document provides the design and development basis for the module product user.By readin
g this document, the user can have a whole understanding our products, technical parameters ha
ve a clear understanding of product, and on by reading the basis of this document user can hel
p user complete 4 G IoT wireless Internet access products or equipment application development.
This hardware development document not only provides the function of product features and technical
parameters, also provides product reliability test standard, business function and related implementation
process, the RF performance and circuit design to guide the user.All are giving users a more
comprehensive design reference.
This document describes the hardware interface of the L710HG module EVB,can help user to quickly
understand L710HG EVB interface specifications, electrical and mechanical details,with the help of this
document users can use L710HG serial module to design and set-up various types wireless terminals.
Intended audience
This document applicable to：
Systems Design Engineer
Structural Engineer
Hardware Engineer
Software Engineer
Test Engineer
Introduction
This document contains 5 chapters, contents as below:
Chapter Content
1 Abstract Introduce L710HGEVB basic technical SPEC.
2 Power Supply Introduce L710HG EVB power for the module.
3 Key Description Introduce L710HG EVB system control key

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4Application interface Introduce L710HG module and L710HG EVB application interface
5Accessory and Assembly Introduce L710HG EVB Accessory and assembly(hardware and software)
1.3 Support and reference documentation list
In addition to the hardware development documentation, we also provide the development board
operation instruction manual and software development instruction manual based on this product. Table
1-1 is support for the list.
Table 1-1Support document list
No. Document
1
《L710HG AT Command User Guide》
2
《L710HG_Hardware_Design》
3
《L710HG_EVB_user manual》
4
《L710HG Schematic checklist》
5
《L710HG Layout checklist》
6
《L710HG_Reference Design.pdf》
7
《L710HG_xx_DECAL.sch》
8
《L710HG_xx_DECAL.PCB》
1.4 Abbreviations
Table 1-2 is the relevant abbreviation and English interpretation of the whole document.
Table 1-2 Abbreviation
Abbreviation
FullnameinEnglish
ESD Electro-Static discharge
USB Universal Serial Bus
UART Universal Asynchronous Receiver Transmitter

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SDCC Secure Digital Card Controller
USIM UniversalSubscriber Identification Module
SPI Serial Peripheral Interface
I2C Inter-Integrated Circuit
PCM Pulse-coded Modulation
I/O Input/output
LED Light Emitting Diode
GPIO General-purpose Input/Output
GSM Global Standard for Mobile Communications
GPRS General Packet Radio Service
CDMA Code Division Multiple Access
WCDMA Wideband Code Division Multi Access
UMTS Universal Mobile Telecommunication System
HSDPA High Speed Downlink Packet Access
HSUPA High Speed Uplink Packet Access
AGPS Assisted Global Positioning System
BER Bit Error Rate
DL Downlink
COEX WLAM/LTE-ISM coexistence
SMPS Switched-mode power supplies
LTE Long Term Evolution
FDD Frequency Division Duplexing
TDD Time Division Duplexing
IoT Internet of things

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2 Abstract
L710HG Evaluation Board (silkscreen L506_EVB ) Is specially designed for developing L710HG serial
module，To help developers to develop, debug, test L710HG series 4 GIoT LTE module. Below and mark
shows L710HG the main functions of the development board. In this article, we will in the subsequent
chapters on the function of each part is described.
Figure 2-1: L710HG EVB global graph
The above picture description:
1. The L710HG USB port is on the EPI board, not on the EVB.
2. The power switch S2. This switch S2 can switch the corresponding power input way, Choose an
external power adapter or direct bonding wire by external input 3.8 V dc power supply.
3. DB9 UART is serial port for module AT instruction, same as USB uart.
4. USB for Debug UART is used for user to retrieve the Debug information.
5. To facilitate the user's use, maintain a minimum system and we provide a power interface on the
L710HG EPI board.

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3 Power Supply
L710HG development board provides two methods for power supply: External DC 5 V adapter and 3.8 V
DC power supply directly. Through an external DC 5 V adapter power supply, the power supply voltage
regulator on the development board piece of power supply will be converted to about 3.8 V,power supply
for the module. These two modes can be switched by S1. Switch S1 to the top when using DC 5V
adapter and Switch S1 to the bottom when using battery power. The power indicator (LED1 next
to the power switch) will light up when the system is powered on. As shown in the figure below:
Figure 3-1: L710HG development board power in Status (orange Power LED Light up)

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4 Key Description
L710HG development board with a total of 5 top pressure switch and 14 dial switch. 5 top pressure for
short press trigger control, 14 dial switch (single pole double throw) for the long time state toggle switch.
The corresponding function on the L710HG development board has a corresponding printing information,
the function of the specific instructions are as follows:
4.1 Power on/off and RESET key
When power supply for the EVB, the power indicator will light up. The lower left corner of the
PWRKEY button on the board, long press 500 MS, can open the module, and press the PWRKEY button
for more time, then reset the module.
Figure 4-1：Power on/off reset key
4.2 FORCED USB download key
The L710HG enables modules to enter forced download mode by pressing the FORCED USB
BOOT button, at which point the FORCED USB BOOT will be pulled up to 1.8v. Before the
system is powered on, press the FORCED USB BOOT key and the PWRKEY key at the same
time to enable the L710HG module to enter the forced download mode.
Figure 4-2：forced usb download key

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4.3 WATCHDOG key
Press the WDOG key and the PWRKEY key at the same time will disable the watchdog function.
Normally on, the watchdog function is enabled, the system will feed the dog regularly. The
watchdog button is mainly used for software debug.
Figure 4-3：WDOG key

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5 Application interface
5.1 UART DB9 Interface
There is a DB9 COM port on the L710HG development board, and its signal pin is consistent with
the signal on the L710HG module. The serial interface as the main serial port can support
complete 9 - line RS232. The COMS 1.8v level on the L710HG module is converted to the
standard RS232 level via serial port level conversion chip SP3238. Users can connect to PC or
other terminal devices through DB9 serial port cable provided for serial port communication.
Main serial port (this function has not been opened yet) supports hardware flow control for AT
instruction, data transmission, etc. When using, you need to dial the switch S4 to the right as
shown in the arrow direction below.
Figure5-1: L710HG RS232 (DB9) Port
Note: .About the serial port baud rate associated Settings, please refer to L710HG
software user manual.
5.2 USB（AT UART）Interface
In addition to the DB9 serial port described in 5.1 for AT communication, L506_EVB_V3 also
provides a set of USB virtual serial ports with exactly the same functions as DB9 serial ports for
AT instruction and data transmission. In use, also need to wave switch S4 to the right. DB9 serial
port function is turned off after USB cable is plugged in. AT instruction and other functions can
only be completed through this serial port.

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Figure5-2: USB（AT UART）Port
5.3 USB（DEBUG UART）Interface
When software is debugging and analyzing problems, LOG can be captured by USB virtual
DEBUG serial port. In use, you need to dial the switch S4 to the left. After the serial port is
inserted into USB, DB9 serial port is closed. Sending AT can only use the USB virtual serial port
mentioned in 5.2.
Figure5-3: USB（DEBUG UART）Port
5.4 USB 2.0 Interface
The L710HG module supports USB 2.0 with a maximum USB transfer rate of 480Mbps.Software
version download can be download through this USB serial port.

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Figure5-4: USB 2.0 Port
5.5 SIM Card Interface
L710HG support one single voltage (1.8V) SIM interface, but for the convenience of users, we have
provided two SIM holder interface. it’s standard SIM card slot and Micro SIM card slot. Each SIM slot
automatic identification (correspond change the SIM support voltage) show as below figure:
Figure5-5: Standard SIM and Micro SIM
Note
： Because L710HG only support one SIM card port, so can’t assemble two SIM
card at the same time in your applications.
5.6 Headset Interface
If the audio codec chip MAX9867ETJ+ is used in L506_EVB_V3, the MIC input and sound
output are through headphone channels. Earphones need to use Chinese standard earphones.

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Figure5-6: Chinese standard earphone
5.7 Antenna interface
The L710HG antenna interface is located on the module load board mounted on the EVB board and
provides two antenna interfaces, one of which is the main antenna port, directly connected to the antenna
for wireless function, and the other is the GPS antenna interface. Main antenna interface adopts SMA
head, connected to the supporting external antenna by cable; GPS antenna USES IPX interface. As
shown in the figure below:
Figure5-7: Function module load plate and antenna interface
Note: L710HG has only one main antenna interface, and the user can only use
ANT_MAIN as the antenna interface when it is actually used.
5.8 Audio interface（TBD）
The L710HG module supports 1-channel PCM channel, which can also be reused as I2S signal.
When using, switch S2 and S3 are needed to cooperate. The switch S2 is a software and hardware
switch. When switching S2 to the top, the software can pull GPIO25 high level to make the power
supply and crystal vibration of CODEC; When switching S2 to the bottom, the hardware

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automatically enables the power and crystal oscillator of CODEC. The switch S3 is the selection
switch of CODEC. When switching S3 to the top, CODEC uses MAX9867ETJ+ chip. When
using the MAX9867ETJ+ chip, the sound comes from the earphone, the Chinese standard
earphone needs to be plugged in. Switch S3 to the bottom, the CODEC chip is NUA8814. At this
time, the sound comes from the SPK end, and 8 ohm horn can be welded to the SPK end. Toggle
switch as shown in the figure below:
Figure5-8: CODEC SWITCH S2 S3
The default audio solution on EVB development board is NAU8814, so the external audio channel
is also developed based on NAU8814. The general block diagram is as follows:
Note: Audio system is a very complicate system, it contains many factors, such as the

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sound chamber structure. Because in our EVB there is no sound chamber, so it only make
sure the function is OK or not.
5.9 LED indicating lamp
The development board has 13 functional indicators to indicate the status of different functional
units. The definitions of each lamp are shown in table 1:
number
name
describe
LED1
System supply
indicator
LED on indicate that the system is powered on
LED2 CODEC enable Switch S2 to the top, and software pull GPIO25
up, the LED on
LED3
NETLIGHT
Network indicator
LED4
I2C_SDA
I2C/GPIO Multiplexing channel
LED5
SPI_MISO_BLSP2
SPI/GPIO Multiplexing channel
LED6
I2C_SCL
I2C/GPIO Multiplexing channel
LED7
WAKEUP_IN
Wake up the interrupt
LED8
STATUS
System status indicator
LED9
ISINK
ISINK
LED11
MB_GPIO_0
GPIO Enable Pin
LED12
SPI_CLK
SPI/GPIO Multiplexing channel
LED13
SPI_MOSI
SPI/GPIO Multiplexing channel
LED14
SPI_CS
SPI/GPIO Multiplexing channel
Table 5-1: LED

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Figure5-9: Status indicator
Note: For configuration and inquiry of each indicator light and toggle switch, please
refer to the L710HG software manual document
5.10 The others
Development board reserved 1 groups of external connection pin interface, used for debugging the
peripheral devices and production test purpose. The corresponding interface definition and physical
objects as shown in the figure below: