Zhejiang Lierda Internet of Things Technology LSD4WN2L917M90 LoRaWAN System Node (US915) User Manual

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Document ID	4066989
Application ID	rUlOxFDt32HV19RonlAExA==
Document Description	User Manual
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
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Date Submitted	2018-11-09 00:00:00
Date Available	2018-11-09 00:00:00
Creation Date	2018-02-23 09:54:38
Document Lastmod	2018-11-09 18:34:45
Document Title	User Manual
Document Creator	WPS Office
Document Author:	Administrator

LSD4WN-2L917M90
User Manual
Documentation Edition：Rev02
Recently updated：March 15, 2017
Document revision history
version
revision date
revision note
1.0.0
2017-10-30
Initial version
Catalogue
Summary............................................................................................................................ 4
Product technical parameters...................................................................................... 5
Product Function Description...................................................................................... 8
3.1
Functional description............................................................................................... 8
3.1.1 Command mode............................................................................................ 10
3.1.2 Transparent transmission mode.................................................................... 10
Mechanical properties................................................................................................. 13
4.1
4.1
4.2
Product appearance.................................................................................................13
Module assembly drawing.......................................................................................13
Module Board PCB Package Dimensions.................................................................14
Interface specification................................................................................................14
5.1
5.2
Pin definition............................................................................................................ 14
Hardware interface description............................................................................... 16
5.2.1 External power.............................................................................................. 16
5.2.2 Reset..............................................................................................................17
5.2.3 Mode control................................................................................................. 17
5.2.4 UART interface............................................................................................. 18
5.2.5 Module status indication............................................................................... 19
5.2.6 Sleep control................................................................................................. 21
5.2.6 Extended GPIO............................................................................................. 21
5.3 Typical application circuit.........................................................................................22
5.3.1 Antenna design proposal............................................................................... 23
1
Summary
LSD4WN-2L917M90 is a LoRaWAN End Node module developed by Lierda
Technology Group.This module integrates the LoRaWANTM protocol stack,
which conforms to LoRaWANTM Specification 1.0.2 standard issued by LoRa
Alliance.Hardware support 902.3-926.8 MHz ultra-wide band.
The module uses the serial interface to communicate with the user
equipment data, instruction interaction.It can easily provide users with fast
LoRaWAN network access and wireless data services.
LSD4WN-2L917M90 module with low power consumption, transmission
distance, anti-interference ability, suitable for a variety of applications: Internet
of things low power applications (IoT), automatic meter reading, smart city,
industrial automation, smart home.
Product features
 working voltage：DC 2.5-3.6V ；
 physical layer：NA915；
 Transmit power：17.0±1.5dBm(max)；
 Ultra-high reception sensitivity：-135±1dBm(@SF=12)；
 Far away from the effective communication distance ：5Km （Urban road
environment,Non-wilderness environment）；
 Meet LoRaWANTM Specification 1.0.2 standard;
 Internal integration LoRaWANTM protocol stack, support Class A \ Class C
device type;
 Low power consumption: standby current ≤ 2.0 uA;
 UART communication, external interface for the stamp hole, simple
command configuration module parameters.
Product technical parameters
The technical parameters of this module are described below, including the
protocol standard, interface characteristic, mechanical characteristic, DC
characteristic parameter, RF characteristic parameter and environmental
characteristic parameter.
Table 2-1
Module technical parameters
parameter
content
describe
Remarks
TM
LoRaWAN Specification
protocol version
Update time June 2017
1.0.2
physical layer
NA915
Access LoRaWAN gateway,
protocol
net topology
Star
the formation of star star network topology
standard
device type
Class A\Class C
Network access mode
OTAA\ABP
Send addressing mode
broadcast
Do not support Class B
LoRa
modulation mode
data rate
SF12~SF7
Serial interface
2 wire UART
Interface
compatible3.3V TTL\CMOS
The user can configure
characteri
2400\4800\9600\38400\1920
the serial baud rate of
0\115200bps
the transparent mode,
Serial baud rate
-stics
and the command mode is
fixed to 9600 bps.
Main antenna
Stamp hole 50Ω output
interface
Interface package
Stamp hole（2×11pin×
type
2.0mm）
PCBA size
25.5(L) ×22(W) ×3.5（H）mm
Mechanical
properties
Table 2-2
(GB/T1804-c)
DC characteristic parameter
Main
least
representa
crest
value
tive value
value
test condition
parameter
unit
remarks
Guaranteed
working
maximum
2.5
3.3
3.6
voltage
output
power20dBm
working
current
average
normal
current
work,9600Bps
2.4
mA
RTC on
uA
maximum output
135
mA
peak point
current;
Table 2-3
Main
RF characteristic parameters
least
representa
crest
value
tive value
value
test condition
parameter
Working band
unit
est voltage：3.3V
Test temperature： 902.3
914.5
926.8
MHz
room temperature
emission
characterist
Carrier output,PA_BOOST ON,25℃ambient temperature
-ic
remarks
Maximum
PA_BOOST
transmit
output,Power full
18.09
17.33
16.41
dBm
power
load,use 9020A
spectrometer to
second
test
-40
dBm
harmonic
emission
RF maximum
the current
current
transmit power
is related to
120
（RF part）
mA
output,
the antenna
instrument load
environment
Receiving
characterist
PER = 1%,CR = 4/6,CRC ON,Preamble Length = 12,Packet Length = 10
-ics
receiving
SF12
-136
dBm
flatness<0.5
sensitivity
SF7
-123
dBm
dB
13
mA
receive
current
（RF part）
frequency
characterist
frequency stability：15ppm@-40℃~85℃
-ic
Table 2-4
main
Environmental characteristic parameters
least
representa
crest
value
tive value
value
-40
+85
℃
-40
+125
℃
95
TBD
test condition
parameter
unit
working
temperature
Storage
temperature
working
humidity
ESD protect
remarks
3
Product Function Description
This module withthe user board connection, including the serial interface,
reset, wake up, mode control, status output and power supply interface. The
block diagram of the module is shown in Table 3-1.
Table 3-1
3.1
Module application
Functional description
This module integrates the LoRaWANTM protocol stack, which conforms to
LoRaWANTM Specification 1.0.2 issued by LoRa Alliance.It also supports Class
A/Class C device type.From the empty band support, the module features
include:
a）LoRaWAN NA915 application
This module interacts with the user through the serial port.
The module operating mode is designed for transparent mode and
command mode.
The user configures the LoRaWAN network parameter in the command
mode via the AT command (if not configured, the default parameter
configuration will be used).Module in the transparent mode, the user can
configure the parameters by using serial data transceiver, requiring the
module to output detailed information (the remaining data, RSSI, packet size,
the number of retransmission, etc.).After receiving a frame of data, the BUSY
pin is pulled low (busy) until the data transfer is completed (success or
failure).If the transmission fails, the STAT pin is pulled low while the BUSY pin is
high (not busy).The STAT pin returns to the high state when the user writes a
new frame of data or reads the transmission failure message through the
command mode.
For the first time, you need to configure the necessary network parameters
of the module and execute the save command. Then, reset the module (the
module initializes the network with the new parameters) and switch to the
transparent mode.
The module will automatically join the set LoRaWAN network. The user can
determine the status of the STAT pin and enter the command mode to query
the current data transmission results and other details.
The module supports operating mode and sleep mode. The user enters or
exits sleep mode by controlling the WAKE pin. The working mode is
subdivided into two sub-modes.The user selects the sub-mode through the
MODE pin, and the working sub-mode is defined as shown in Table 3-1.
Table 3-1
Work mode of module
work mode
description
transparent
Forward user data. You can choose the details of the output, etc., to
transmission
facilitate debugging
mode
Read the status or configuration parameters through the AT command.Some
command mode
parameters need to use the save instruction and reset to take effect.
3.1.1 Command mode
In the command mode, the user can send AT commands through the serial
port to access the module. The client sends an instruction to the module,
which parses the received command and returns a command response frame
indicating the execution result of the received command.2 完成后,再处理这个模
式切换请求。
3.1.2 Transparent transmission mode
In transparent transfer mode, the module forwards user data directly.If you
turn on the ADR mechanism of the LoRaWAN network, a simple flow control
mechanism is introduced in order to ensure the reliability and integrity of the
data transmission because the maximum data length of each empty port
10
packet may change dynamically.
1)、Flow control mechanism
The user determines the length of a frame of data. When the serial port
exceeds the 2-byte transmission time does not receive the new serial data data
or reaches the FIFO storage limit, it is judged that one frame of data
transmission is completed.It immediately pull down the BUSY pin (busy) and
the serial port is received and the sending operation is performed. After the
transmission is complete (successful or failed), the BUSY pin is re-pulled high,
and if the WAKE pin is still high, re-enable the module's serial port reception.
2)、Physical subcontracting mechanism
The actual physical packetization is determined by Network Server, and the
user can query the response parameters via the AT command or request
detailed information to obtain the packet case.
In general, the maximum load value N corresponding to different rates is
shown in Table 3-2.
Table 3-2
The maximum load value corresponding to the different rates
SF
N（MAX）
222
222
115
10
51
11
51
12
51
11
3）、Server response
According to LoRaWAN network Class A operating characteristics, for any
packet of data, the user server can give a response. If the module receives the
user server data, it will immediately output through the serial port. Therefore,
due to the reason for the data frame packet, the user's one frame of data may
receive a number of response packets.
12
4
Mechanical properties
4.1
Product appearance
Product physical map as shown in 4-1 and 4-2,
the EUI and S \ N, etc. in
the labelfor reference only and specific to the actual subject.The label of the
small black spots identified as the module Pin1:
Table 4-1
Pin22
Pin1
Pin12
Pin11
Table 4-2
4.1
LSD4WN-2L917M90 TOP layout
LSD4WN-2L917M90 BOT layout
Module assembly drawing
The module assembly diagram is shown in Figure 4-3 (in mm) and the left
view is Top View.
13
Figure 4-3
4.2
Module assembly drawing
Module Board PCB Package Dimensions
Please design motherboard module PCB package according to Figure 4-2,
our company can provide the module PCB packaging.
Interface specification
5.1
Pin definition
All I \ O ports are CMOS compatible with TTL. The module pin functions are
shown in Table 5-1:
Table 5-1
Pin definition
functional
Pin
Port type
default value
describtion
definition
GND
Power
Connect the system ground
GND
Power
Connect the system ground
P1
I/O
Low
Extended functionality , such as GPIO/ADC
14
1
P2
I/O
Low
Extended functionality ,such as GPIO/ADC
P3
I/O
Low
Extended functionality ,such as GPIO/ADC
GND
Power
Connect the system ground
WAKE
Input
Float
Wake up \ close the module
STAT
Ouptut
Low
Status indication
NC
NC
Floating treatment
10
NC
NC
Floating treatment
11
P0
I/O
Low
Extended functionality ,such as GPIO/ADC
12
GND
Power
Connect the system ground
13
VCC
Power
System power supply, power supply range of
2.5 ~ 3.6V
Reset module, internal weak pull-up, active
14
NRST
Reset
PULL-UP
low.If the user does not use, can float it.
15
BUSY
Output
Low
Module busy signal output
Operating mode control, according to the
16
MODE
Input
Low
user control level, the internal automatic
pull\ down
17
GND
Power
Connect the system ground
18
TXD
Output
High
The port of transmission(TX)
19
RXD
Input
High-impendance
The port of receiving(RX)
20
GND
Power
Connect the system ground
21
GND
Power
Connect the system ground
22
ANT
RF
RF export. Note that the use of 50Ω
impedance line
Note 1：The extended function is used to open the IO operation.
Note 2：Light blue is the smallest use of the client system
Note 3：The default value indicates that the user has not configured any of
the modules after the first power-on.
15
5.2
Hardware interface description
When using the LSD4WN-2L917M90 module for hardware design,
according to the practical application, it is necessary to select and design the
interface and its peripheral circuit.
The LSD4WN-2L917M90 module application interface includes the
following:

External power

Reset

Mode control

UART interface

Module status indicator

Sleep control

Extended GPIO
5.2.1 External power
Users in the use of this module, the first need to ensure that the external
power supply sufficient power supply capacity, and the power supply area
needs to be strictly controlled between 2.5V ~ 3.6V. Higher than the module
power supply range, will cause the module's main chip is damaged. Lowering
than the module power supply range will affect the RF circuit work,so it can
not guarantee the maximum output power.
16
5.2.2 Reset
The user supplies the module NRST pin with a low pulse of at least 1ms (or
directly pulls down) and will reset the module. You need to wait for a reset
delay time of 150ms after module reset to ensure that the module system
initialization is complete. The module reset pin function is shown in Table 5-2:
Table 5-2
Inter
defin
Pin
-face
reset
Reset pin function
I/O
describtion
remarks
ition
14
NRST
Input
high
Module normal
level
operation
low
Module remains reset
level
(reset MCU)
After the module is
reset, the user needs
to wait for the reset
delay time to operate
the module.
5.2.3 Mode control
The module has two modes of operation in which the user selects the
mode through the MODE pin. If the user does not know the module's current
operating mode, the user can read the status of the pin to get. Table 5-3 shows
the function of the module mode control pin.
Table 5-3
inter
defin
Pin
face
Mode
Mode control pin function
I/O
Describtion
Input
If the module detects a signal：
ition
16
MODE
contr
High
A high level pulse (rising edge & high
ol
level
level) is detected to enter and
resides in command mode
17
remark
Low
A low level pulse (falling edge & low
level
level) is detected to enter and
resides in the transparent mode
5.2.4 UART interface
Module provides a UART interface, combined with custom software flow
control to complete the serial communication. The default serial port is set to
9600N81 and the external interface level is 3.3V TTL \ CMOS level.The user
pulls the WAKE pin each time the data is sent. Wait 10ms after the wake-up
module (so that the module is ready to serial port, etc.). The user pulls down
the WAKE pin, and the module goes into sleep mode. The serial interface
functions are shown in Table 5-4:
Table 5-4
inter
Serial interface
Defin
pin
face
I/O
describtion
Remark
The port of transmission(TX)
The TX signal
ition
Out
18
TXD
direction of
put
the module
The port of receiving(RX)
The RX signal
Inp
19
RXD
direction of
ut
the module
Module busy signal output
The maximum
UART
packet size
Module
15
initial
High
Module
free.
specified for
Out
ization
level
Indicates that the
the port rate
put
(reset
user MCU can continue
is shown in
or WAKE
to write data to the
Table 3.2
wakeup)
module.
is
BUSY
Low
18
Module
busy.
level
Indicates that the
user
MCU
pauses
writing data to the
module.
Data
communi
High
Module
cation
level
Indicates that the
phase
is
free.
user MCU can continue
to write data to the
module.
Low
level
Module
busy.
Indicates that the
user
MCU
pauses
writing data to the
module.
Module wake up \ sleep
High
Before sending data, the user must
level
pull the WAKE pin and wait 10ms to
Inp
wake up the module
WAKE
ut
low
Module enters sleep mode
level
5.2.5 Module status indication
The STAT pin of the module currently defines two functions：
（1） The module first joins the network operation when it first accesses
the LoRaWAN network. During the JOIN process, the STAT pin is always held
low until the module successfully joins the network. STAT output at this time
19
high, the module can normally handle the user's serial data. The user now can
through a specific AT command to further obtain detailed status information.
Note: In the search network process, the user at this time through a specific
AT command to further obtain detailed status information. After the user query
is complete, the transparent mode is switched immediately.
（ 2 ） After the module accesses the LoRaWAN network, the module
dynamically updates the network status of the module. The status change is
output via the STAT pin. If the module is operating abnormally, the STAT pin is
output low. The user can now through a specific AT command to further obtain
detailed status information.
Table 5-6 shows the status indication pin functions：
Table 5-6
inter
Status indicator pin
defin
Pin
face
I/O
Describetion
remark
If the module is in
The
ition
STAT pin indicates the network
specific
status
exception
High
Module network
status
level
success
can be
low
Module is not
read by a
level
network, waiting for
specific
the network success
AT
Connect
Network
State
stage
outpu
STAT
Output
command
Data
STATpin indicates the network
communic
status
ation
High
The network status
phase
level
of the module is
20
normal
Low
The network status
level
of the module is
abnormal
5.2.6 Sleep control
In order to meet the low-power application scenarios, the user can make
module enter the sleep state by pulling down the sleep pin WAKE and keeping
it for at least 5ms when the user does not need to use it. In the sleep state, the
module will not carry out any data operations, but will still save the network
information. The user can wake up the module by pulling the WAKE pin high
for at least 5ms. Wake up after the normal data can be carried out.Sleep
control is shown in Table 5-7:
Table 5-7
inter
Sleep pin
denif
Pin
face
I/O
Describetion
Remark
ition
If the wake pin is in
High
Wake up module and the module is
level
in normal working condition
Low level
The control module goes to sleep
Sleep
WAKE
Input
pin
5.2.6 Extended GPIO
Module provides P0-P3 extended GPIO port, the user can now AT + GPIO
instruction, control the designated GPIO port output high \ low. To extend the
21
GPIO description, as shown in Table 5-8:
Table 5-8
Extended
GPIO
defi
inter
pin
niti
I/O
Describetion
Remark
face
on
Control the output high or low by the AT + GPIO
GPIO
11
P0
Output
instruction
Control the output high or low by the AT + GPIO
GPIO
P1
Output
instruction
Control the output high or low by the AT + GPIO
GPIO
P2
Output
instruction
Control the output high or low by the AT + GPIO
GPIO
P3
Output
instruction
5.3
Typical application circuit
User interface: serial port, GPIO, power and so on
Antenna interface: 50Ω stamp hole output
Table 5-1
LSD4WN-2L917M90
Typical application circuit
instruction：
1：Bold Trace is required for the system connection (recommended).
2 ： The green trace of the antenna exit (ANT <-> PIN22) requires 50 Ω
22
impedance matching.
3 ： By default, R1 is 0 Ω . C1, C2 for the empty posted. C4 empty (only
reserved).
4、R1, C1, C2 parameters of the specific value, determined by the product
after the antenna match.
5、Antenna layout design, please refer to our company "RF PCB LAYOUT
design rules (for sub-1GHZ and Bluetooth module) _WSN_160824".
5.3.1 Antenna design proposal
Antenna design is directly related to the product's communication
performance. Different terminals according to the antenna size, cost,
performance will choose different types of antenna. Short-range antenna in
the more common PCB antenna, chip (ceramic) antenna, spring antenna, whip
antenna and so on. When selecting an antenna, it is important to consider the
following important parameters: radiation changes in different directions
around the antenna, antenna efficiency, bandwidth required for antenna
operation, and power to be supplied to the antenna. Among them, the
antenna bandwidth is typically defined as a frequency range in which the
reflected wave is below -10 dB or VSWR is less than 2, the antenna reflection
power is less than 10%.
Currently for LoRa table applications, our company mainly provides dipole antenna.
23
Important Notes:
1. Welcome to use the products of the Lierda Technology Co., Ltd.. Before
using the products of our company, please read this warning first. If you have already
used the product which indicates that you have read and accepted the warning.
Using the product indicates that you have read and accepted this warning.
2. The final interpretation and modification of all the information provided to
this tool are reserved. No more notification will be given if the information were
updated.
FCC Statement
Any Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
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.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment .
This equipment should be installed and operated with minimum distance 20cm
between the radiator& your body.
FCC Label Instructions:
The outside of final products that contains this module device must display a label
referring to the enclosed module. This exterior label can use wording such as:
"Contains Transmitter Module FCC ID: 2AOFDLSD4WN2L917M90 or Contains
FCC ID: 2AOFDLSD4WN2L917M90" , Any similar wording that expresses the same
meaning may be used.
24

---

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