Zhejiang Lierda Internet of Things technology LSD4WN2L917M90 User Manual

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LSD4WN-2L917M90

User Manual

Documentation Edition：Rev02

1 Summary

LSD4WN-2L917M90 is a LoRaWAN End Node module developed by Lierda

Technology Group.This module integrates the LoRaWAN

which conforms to LoRaWAN

Specification 1.0.2 standard issued by LoRa

protocol stack,

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 LoRaWAN

 Internal integration LoRaWAN

device type;

Specification 1.0.2 standard;

protocol stack, support Class A \ Class C

 Low power consumption: standby current ≤ 2.0 uA;

 UART communication, external interface for the stamp hole, simple

command configuration module parameters.

parameter

content

protocol

standard

describe

Remarks

protocol version

LoRaWANTMSpecification

1.0.2

Update time June 2017

physical layer

NA915

net topology

Star

Access LoRaWAN gateway,

the formation of star -

star network topology

device type

Class A\Class C

Do not support Class B

Network access mode

OTAA\ABP

Send addressing mode

broadcast

modulation mode

data rate

SF12~SF7

Interface

characteri

-stics

Serial interface

2 wire UART

compatible3.3V TTL\CMOS

Serial baud rate

2400\4800\9600\38400\1920

0\115200bps

The user can configure

the serial baud rate of

the transparent mode,

and the command mode is

2 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

LoRa

fixed to 9600 bps.

Main antenna

interface

Stamp hole 50Ω output

Mechanical

properties

Interface package

type

Stamp hole（2×11pin×

2.0mm）

PCBA size

.5(L) ×22(W) ×3.5（H）mm

(GB/T1804-c)

Main

parameter

test condition

least

value

representa

tive value

crest

value

unit

remarks

working

voltage

2.5

3.3

3.6

Guaranteed

maximum

output

power20dBm

working

current

average

current

normal

work,9600Bps

2.4

RTC on

-23

peak point

current;

maximum output

--135

Main

parameter

test condition

least

value

representa

tive value

crest

value

unit

remarks

Working band

est voltage：3.3V

Test temperature：

room temperature

MHz

emission

characterist

-ic

Table 2-2 DC characteristic parameter

Table 2-3 RF characteristic parameters

902.3

Carrier output,PA_BOOST ON,25℃ambient temperature

914.5

926.8

Maximum

transmit

power

PA_BOOST

output,Power full

load,use 9020A

spectrometer to

test

18.09

dBm

second

harmonic

-40

dBm

emission

current

（RF part）

RF maximum

transmit power

output,

instrument load

120

the current

is related to

the antenna

environment

Receiving

characterist

-ics

PER = 1%,CR = 4/6,CRC ON,Preamble Length = 12,Packet Length = 10

receiving

sensitivity

SF12

-136

dBm

flatness<0.5

SF7

-123

dBm

receive

current

（RF part）

-13-

frequency

characterist

-ic

frequency stability：15ppm@-40℃~85℃

main

parameter

test condition

least

value

representa

tive value

crest

value

unit

remarks

working

temperature

-40-+85

℃

Storage

temperature

-40-+125

℃

working

humidity

-5-95%

ESD protect

---

TBD

17.33 16.41

Table 2-4 Environmental characteristic parameters

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 Module application

3.1 Functional description

This module integrates the LoRaWANTMprotocol stack, which conforms to

LoRaWANTMSpecification 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.

work mode

description

transparent

transmission

mode

Forward user data. You can choose the details of the output, etc., to

facilitate debugging

command mode

Read the status or configuration parameters through the AT command.Some

parameters need to use the save instruction and reset to take effect.

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

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

packet may change dynamically.

N（MAX）

222

115

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

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.

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 LSD4WN-2L917M90 TOP layout

Pin22 Pin1

Pin12

Table 4-2 LSD4WN-2L917M90 BOT layout

4.1 Module assembly drawing

The module assembly diagram is shown in Figure 4-3 (in mm) and the left

view is Top View.

Pin11

Figure 4-3 Module assembly drawing

functional

definition

Port type

default value3describtion

GND

Power-Connect the system ground

GND

Power-Connect the system ground

3P1I/O

Low

Extended functionality1, such as GPIO/ADC

4.2 Module Board PCB Package Dimensions

Please design motherboard module PCB package according to Figure 4-2,

our company can provide the module PCB packaging.

5 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

4P2I/O

Low

Extended functionality1,such as GPIO/ADC

5P3I/O

Low

Extended functionality1,such as GPIO/ADC

GND

Power-Connect the system ground

WAKE

Input

Float

Wake up \ close the module

STAT

Ouptut

Low

Status indication

9NCNC

Floating treatment

10NCNC

Floating treatment

11P0I/O

Low

Extended functionality1,such as GPIO/ADC

GND

Power-Connect the system ground

VCC

Power

System power supply, power supply range of

2.5 ~ 3.6V

NRST

Reset

PULL-UP

Reset module, internal weak pull-up, active

low.If the user does not use, can float it.

BUSY

Output

Low

Module busy signal output

MODE

Input

Low

Operating mode control, according to the

user control level, the internal automatic

pull\ down

GND

Power-Connect the system ground

TXD

Output

High

The port of transmission(TX)

RXD

Input

High-impendance

The port of receiving(RX)

GND

Power-Connect the system ground

GND

Power-Connect the system ground

ANTRF-

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.

5.2 Hardware interface description

 External power

 Reset

 Mode control

 UART interface

 Module status indicator

 Sleep control

 Extended GPIO

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:

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.

5.2.2 Reset

Inter

-face

defin

ition

I/O

describtion

remarks

reset14NRST

Input

high

level

Module normal

operation

low

level

Module remains reset

(reset MCU)

After the module is

reset, the user needs

to wait for the reset

delay time to operate

the module.

inter

face

defin

ition

I/O

Describtion

remark

Mode

contr

MODE

Input

If the module detects a signal：

High

level

A high level pulse (rising edge & high

level) is detected to enter and

resides in command mode

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 Reset pin function

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 Mode control pin function

Low

level

A low level pulse (falling edge & low

level) is detected to enter and

resides in the transparent mode

5.2.4 UART interface

inter

face

Defin

ition

I/O

describtion

Remark

UART

TXD

Out

put

The port of transmission(TX)

The TX signal

direction of

the module

RXD

Inp

The port of receiving(RX)

The RX signal

direction of

the module

BUSY

Out

put

Module busy signal output

Module

initial

ization

(reset

or WAKE

wakeup)

High

level

Module is free.

Indicates that the

user MCU can continue

to write data to the

module.

Low

Module busy.

The maximum

packet size

specified for

the port rate

is shown in

Table 3.2

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 Serial interface

level

Indicates that the

user MCU pauses

writing data to the

module.

Data

communi

cation

phase

High

level

Module is free.

Indicates that the

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.

WAKE

Inp

Module wake up \ sleep

High

level

Before sending data, the user must

pull the WAKE pin and wait 10ms to

wake up the module

low

level

Module enters sleep mode

（1） The module first joins the network operation when it first accesses

5.2.5 Module status indication

The STAT pin of the module currently defines two functions：

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

high, the module can normally handle the user's serial data. The user now can

inter

face

defin

ition

I/O

Describetion

remark

State

output8

STAT

Output

If the module is in

Connect

Network

stage

STAT pin indicates the network

status

High

level

Module network

success

low

level

Module is not

network, waiting for

the network success

Data

communic

ation

phase

STATpin indicates the network

status

High

level

The network status

of the module is

The

specific

exception

status

can be

read by a

specific

command

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 Status indicator pin

normal

Low

level

The network status

of the module is

abnormal

5.2.6 Sleep control

inter

face

denif

ition

I/O

Describetion

Remark

Sleep

WAKE

Input

If the wake pin is in

High

level

Wake up module and the module is

in normal working condition

Low level

The control module goes to sleep

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 Sleep 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

GPIO description, as shown in Table 5-8:

inter

face

defi

nitionI/O

Describetion

Remark

GPIO11P0

Output

Control the output high or low by the AT + GPIO

instruction

GPIO3P1

Output

Control the output high or low by the AT + GPIO

instruction

GPIO4P2

Output

Control the output high or low by the AT + GPIO

instruction

GPIO5P3

Output

Control the output high or low by the AT + GPIO

instruction

Table 5-8 Extended GPIO

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

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.

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.

Zhejiang Lierda Internet of Things technology LSD4WN2L917M90 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Summary

2 Product technical parameters

3 Product Function Description

3.1 Functional description

3.1.1 Command mode

3.1.2 Transparent transmission mode

4 Mechanical properties

4.1 Product appearance

4.1 Module assembly drawing

4.2 Module Board PCB Package Dimensions

5 Interface specification

5.1 Pin definition

5.2 Hardware interface description

5.2.1 External power

5.2.2 Reset

5.2.3 Mode control

5.2.4 UART interface

5.2.5 Module status indication

5.2.6 Sleep control

5.2.6 Extended GPIO

5.3 Typical application circuit

5.3.1 Antenna design proposal

Important Notes: