FCC ID: 2AOFDLSD4WN2L917M90 LoRaWAN System Node (US915)

LSD4WN-2L917M90 User Manual Documentation EditionRev02 Recently updatedMarch 15, 2017 1 Document revision history version revision date revision note 1.0.0 2017-10-30 Initial version 2 Catalogue 1 Summary............................................................................................................................4 2 Product technical parameters......................................................................................5 3 Product Function Description...................................................................................... 8 3.1 Functional description............................................................................................... 8 3.1.1 Command mode............................................................................................ 10 3.1.2 Transparent transmission mode.................................................................... 10 4 Mechanical properties.................................................................................................13 4.1 Product appearance.................................................................................................13 4.1 Module assembly drawing.......................................................................................13 4.2 Module Board PCB Package Dimensions.................................................................14 Interface specification................................................................................................14 5 5.1 Pin definition............................................................................................................14 5.2 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 3 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 voltageDC 2.5-3.6V physical layerNA915 Transmit power17.01.5dBm(max) Ultra-high reception sensitivity-1351dBm(@SF=12) Far away from the effective communication distance5Km 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;

4 Low power consumption: standby current 2.0 uA;

UART communication, external interface for the stamp hole, simple command configuration module parameters. 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 parameter content describe Remarks protocol version Update time June 2017 LoRaWANTM Specification physical layer protocol net topology standard 1.0.2 NA915 Star device type Class A\Class C Network access mode OTAA\ABP Send addressing mode broadcast modulation mode LoRa data rate SF12~SF7 Access LoRaWAN gateway, the formation of star -

star network topology Do not support Class B Serial interface 2 wire UART compatible3.3V TTL\CMOS Interface characteri

-stics Serial baud rate 2400\4800\9600\38400\1920 the serial baud rate of 0\115200bps the transparent mode, The user can configure and the command mode is 5 fixed to 9600 bps. Main antenna interface Stamp hole 50 output Interface package Stamp hole211pin Mechanical properties type PCBA size 2.0mm 25.5(L) 22(W) 3.5Hmm

(GB/T1804-c) Table 2-2 DC characteristic parameter Main parameter test condition least representa crest value tive value value unit remarks working voltage working current average

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2.5 3.3 3.6 V Guaranteed maximum output power20dBm normal current work,9600Bps RTC on maximum output peak point current;

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2.4 2

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3 135 mA uA mA Table 2-3 RF characteristic parameters Main parameter test condition least representa crest value tive value value unit remarks Working band est voltage3.3V Test temperature 902.3 914.5 926.8 MHz room temperature emission characterist Carrier output,PA_BOOST ON,25ambient temperature

-ic 6 PA_BOOST output,Power full 18.09 17.33 16.41 dBm Maximum transmit power second harmonic load,use 9020A spectrometer to test emission RF maximum current transmit power RF part output, instrument load Receiving

-40 120 dBm mA the current is related to the antenna environment characterist PER = 1%,CR = 4/6,CRC ON,Preamble Length = 12,Packet Length = 10

-ics receiving sensitivity receive current RF part frequency SF12 SF7

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-136

-123 13

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dBm dBm mA flatness<0.5 dB characterist frequency stability15ppm@-40~85

-ic main parameter working temperature Storage temperature working humidity ESD protect Table 2-4 Environmental characteristic parameters test condition least representa crest value tive value value unit remarks

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-40

-40 5

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7

+85

+125 95 TBD

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V 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 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 8 include:

aLoRaWAN 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 9 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 mode command mode facilitate debugging Read the status or configuration parameters through the AT command.Some 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 , 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 7 8 9 10 11 12 NMAX 222 222 115 51 51 51 11 3Server 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 LSD4WN-2L917M90 TOP layout Pin22 Pin1 Pin12 Pin11 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. 13 Figure 4-3 Module assembly drawing 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. Interface specification 5 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 Pin functional definition 1 2 3 GND GND P1 Port type default value3 describtion Power Power I/O

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Low 14 Connect the system ground Connect the system ground Extended functionality1, such as GPIO/ADC 4 5 6 7 8 9 10 11 12 13 14 15 P2 P3 GND WAKE STAT NC NC P0 GND VCC I/O I/O Power Input Ouptut NC NC I/O Power Power Low Low

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Float Low

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Low

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NRST Reset PULL-UP Extended functionality1,such as GPIO/ADC Extended functionality1,such as GPIO/ADC Connect the system ground Wake up \ close the module Status indication Floating treatment Floating treatment Extended functionality1,such as GPIO/ADC Connect the system ground System power supply, power supply range of 2.5 ~ 3.6V Reset module, internal weak pull-up, active low.If the user does not use, can float it. 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 18 19 20 21 22 GND TXD RXD GND GND ANT Power Output

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High Connect the system ground The port of transmission(TX) Input High-impendance The port of receiving(RX) Power Power RF

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Connect the system ground Connect the system ground RF export. Note that the use of 50 impedance line Note 1The extended function is used to open the IO operation. Note 2Light blue is the smallest use of the client system Note 3The 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 Reset pin function Inter

-face Pin defin ition I/O describtion remarks high level Module normal operation reset 14 NRST Input 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 Mode control pin function inter face Pin defin ition I/O Describtion remark Mode 16 MODE Input If the module detects a signal contr ol High A high level pulse (rising edge & high level level) is detected to enter and resides in command mode 17 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 Serial interface inter face pin Defin ition 18 TXD 19 RXD 15 BUSY UART I/O Out put Inp ut Out put describtion Remark The port of transmission(TX) The TX signal direction of the module The port of receiving(RX) The RX signal direction of the module Module busy signal output The maximum Module packet size initial High Module is free. specified for ization level Indicates that the the port rate

(reset or WAKE wakeup) user MCU can continue is shown in to write data to the Table 3.2 module. Low Module busy. 18 level Indicates that the user MCU pauses writing data to the module. Data communi High Module is free. cation level Indicates that the phase user MCU can continue to write data to the module. Low Module busy. level Indicates that the user MCU pauses writing data to the module. 7 WAKE Inp ut Module wake up \ sleep High Before sending data, the user must level pull the WAKE pin and wait 10ms to wake up the module 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 Status indicator pin inter face Pin defin ition I/O Describetion If the module is in remark The STAT pin indicates the network specific status exception State High Module network level success low Module is not Connect Network stage outpu 8 STAT Output level network, waiting for t the network success status can be read by a specific AT command Data STATpin indicates the network communic status ation phase High The network status 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 Sleep pin inter face Pin denif ition I/O Describetion Remark If the wake pin is in High Wake up module and the module is Sleep pin 7 WAKE Input level in normal working condition Low level The control module goes to sleep 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 pin niti I/O Describetion Remark inter face on GPIO 11 P0 Output instruction Control the output high or low by the AT + GPIO GPIO GPIO GPIO 3 4 5 P1 Output P2 Output P3 Output Control the output high or low by the AT + GPIO instruction Control the output high or low by the AT + GPIO instruction Control the output high or low by the AT + GPIO instruction 5.3 Typical application circuit User interface: serial port, GPIO, power and so on Antenna interface: 50 stamp hole output Table 5-1 LSD4WN-2L917M90 Typical application circuit instruction 1Bold Trace is required for the system connection (recommended). 2 The green trace of the antenna exit (ANT <-> PIN22) requires 50 22 impedance matching. 3 By default, R1 is 0 . C1, C2 for the empty posted. C4 empty (only reserved). 4R1, C1, C2 parameters of the specific value, determined by the product after the antenna match. 5Antenna 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 users 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