FCC ID: 2ALPH-E22400T22S Wireless transceiver module

E22-400T22S User Manual SX1268 434MHz SMD Wireless Module CONTENTS 1. OVERVIEW........................................................................................................................................3 1.1 INTRODUCTION............................................................................................................................................................... 3 1.2 FEATURES........................................................................................................................................................................3 1.3 APPLICATION...................................................................................................................................................................4 1.4 FUNCTION INTRODUCTION...............................................................................................................................................4 2. SPECIFICATION AND PARAMETER..............................................................................................5 2.1 LIMIT PARAMETER............................................................................................................................................................ 5 2.2 OPERATING PARAMETER...................................................................................................................................................5 3 SIZE AND PIN DEFINITION............................................................................................................ 6 4. CONNECT TO MCU.........................................................................................................................8 5 FUNCTION DESCRIPTION.............................................................................................................. 8 5.1 FIXED TRANSMISSION.......................................................................................................................................................8 5.2 BROADCASTING TRANSMISSION........................................................................................................................................9 5.3 BROADCASTING ADDRESS.................................................................................................................................................9 5.4 MONITOR ADDRESS.........................................................................................................................................................9 5.5 RESET............................................................................................................................................................................. 9 5.6 AUX DESCRIPTION........................................................................................................................................................ 10 5.6.1IndicationofUARToutput................................................................................................................................10 5.6.2Indicationofwirelesstransmitting................................................................................................................... 10 5.6.3Configurationprocedureofmodule................................................................................................................11 5.6.4NotesforAUX.................................................................................................................................................... 11 6 OPERATING MODE........................................................................................................................11 6.1 MODE SWITCHING.................................................................................................................... 12 6.2 NORMAL MODEMODE 0........................................................................................................................................12 6.3 WOR MODEMODE 1............................................................................................................................................ 13 6.4 CONFIGURATION MODEMODE 2............................................................................................................................ 13 6.5 DEEP SLEEP MODEMODE 3.................................................................................................................................... 13 7 HARDWARE DESIGN.....................................................................................................................13 8 FAQ.................................................................................................................................................. 14 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 8.1 COMMUNICATION RANGE IS TOO SHORT........................................................................................................................ 14 8.2 MODULE IS EASY TO DAMAGE........................................................................................................................................15 8.3 BER(BIT ERROR RATE) IS HIGH.....................................................................................................................................15 9 PRODUCTION GUIDANCE............................................................................................................15 9.1 REFLOW SOLDERING TEMPERATURE.................................................................................................................................15 9.2 REFLOW SOLDERING CURVE............................................................................................................................................16 10 PACKAGE FOR BATCH ORDER..................................................................................................16 REVISION HISTORY.......................................................................................................................... 17 ABOUT US.......................................................................................................................................... 17 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 1. Overview 1.1 Introduction E22-400T22S is a wireless serial port module (UART) based on SEMTECH's SX1268 RF chip. It has multiple transmission modes, working in the 434MHz, LoRa spread spectrum technology, TTL level output, compatible with 3.3V and 5V IO port voltage. LoRa direct sequence spread spectrum technology will bring longer communication distance, and has the advantages of concentrated power density and strong anti-interference ability. The module has a software FEC forward error correction algorithm, which has high coding efficiency and strong error correction capability. In the case of sudden interference, it can actively correct the interfered data packets, greatly improving reliability and transmission distance. When without FEC, such packets can only be discarded. The module has data encryption. Data transmitted over the air, with randomness, makes data interception meaningless through strict encryption and decryption algorithms. The module reserves multiple IO interfaces to provide custom development services.It supports packet length setting and also supports different real-time and data packets. 1.2 Features Communication distance tested is up to 7km Support the global license-free ISM 434MHz band Support air date rate of 0.3kbps62.5kbps Support new generation LoRa technology based on SX1268 Compared with SX1276, the power consumption of hardware is reduced by 40%,and the power consumption of software is reduced by 35%;

Compared with the SX1276, for the same power consumption, the transmission power is increased by 80%;

Low power consumption for battery supplied applications Support 3.3V~5.5V power supply, power supply over 5.0 V can guarantee the best performance Industrial grade standard design, support -40 ~ 85 C for working over a long time IPEX and stamp hole optional, good for secondary development and integration. Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 3 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 1.3 Application Home security alarm and remote keyless entry Smart home and industrial sensors Wireless alarm security system Building automation solutions Wireless industrial-grade remote control Health care products Advanced Meter Reading Architecture(AMI) Automotive industry applications. 1.4 Function introduction LoRa spread spectrum: LoRa direct sequence spread spectrum technology will bring longer communication distance;

low transmit power density, it is not easy to cause interference to other equipment. High confidentiality, extremely low probability of interception; strong anti-interference ability, strong suppression of co-channel interference and various noises; excellent anti-multipath fading performance. LBT: The module has a Listen before talk (LBT) function. When this function is enabled, the module actively monitors the channel environment noise before transmitting. If the noise exceeds the threshold, it will be sent delayed. This feature can greatly improve the communication success rate of the module in harsh environments. This function can be used for network transmission and anti-collision processing. RSSI: The signal strength indication function. The module supports packet signal strength serial output. Can be used to assess signal quality, improve communication networks, and ranging. The module supports ambient noise signal strength serial output. It can be used to implement LBT functions manually. Wireless configuration: Remotely configure or read wireless module parameters by sending command packets wirelessly. Ultra-low power consumption: the air wake-up function. It is especially suitable for battery-powered applications: when the module is in WOR state, the configuration module WOR monitors the overall power consumption of the adjustable module. The maximum configurable response delay of the module is 4000ms. The average current of the module in this mode is about 2uA. Broadcast monitoring: Set the module address to 0xFFFF, which can monitor the data transmission of the module on the same channel; the transmitted data can be received by the module of any address on the same channel, thus playing the role of broadcasting and monitoring. Forward error correction: The module has FEC forward error correction algorithm, which has high coding efficiency and strong error correction capability. In the case of sudden interference, it can actively correct the interfered data packets, greatly improving reliability and transmission distance. When without FEC, such packets can only be discarded. Deep sleep function: When the module is in sleep mode, mode 3, the wireless receiver is turned off and the micro-controller is in a sleep state; at this time, the power consumption of the whole device is about 2uA. Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 4 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual Watchdog: The module has a built-in watchdog and performs precise time layout. Once an exception occurs, the module will restart within 1 second and continue to work according to the previous parameter settings. Parameter saving: After the user sets the parameters, the module parameters will be saved, the power will not be lost, and the module will work according to the set parameters after power-on. Applicable environment: 434MHz is free frequency band, users can use it directly without application; 434MHz features certain penetration and diffraction ability, suitable for environment with small data volume, long transmission distance and easy to be interfered. 2. Specification and parameter 2.1 Limit parameter Main parameter Power supplyV Blocking powerdBm Operating temperature 2.2 Operating parameter Main parameter Operating voltageV Communication levelV Operating temperature Operating frequencyMHz TX currentmA RX currentmA Power consump tion Sleep current A Max Tx powerdBm Receiving sensitivitydBm Air data ratebps Performance Min. Max. Remark 0

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-40 Performance Typ. 5.0 3.3

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434 133 11 469 10

-147 2.4k 5.5 10 85 Max. 5.5 85

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-148 62.5k Min. 2.3

-40

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-146 0.3k Voltage over 5.5V will cause permanent damage to module Chances of burn is slim when modules are used in short distance

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Remark 5.0 V ensures output power For 5V TTL, it may be at risk of burning down Industrial design Support ISM band Instant power consumption Software is shut down Air data rate is 2.4kbps Controlled via users programming Main parameter Description Remark Distance for reference TX length 7000m 240 Btye Test conditionclear and open area, antenna gain: 5dBi antenna height: 2.5mair data rate: 2.4kbps Can be configured via command as 32/64/128/240 Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 5 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual bytes per packet to transmit Buffer Modulation Communication interface Package Connector Size Antenna 1000 Btye GFSK LoRa UART SMD 1.27mm 16 * 26 mm IPEX/stamp hole 50 ohm impedance 3 Size and pin definition No. Name Direction Function 1 2 3 GND GND GND Ground Ground Ground Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 6 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 GND M0 M1 RXD TXD AUX VCC GND NC GND NC NC NC NC NC GND GND ANT GND Ground Input Work with M1 to decide 4 working modes of module (not suspended, if not weak pull-up used, could be grounded). Input Work with M0 to decide 4 working modes of module (not suspended, if not weak pull-up used, could be grounded). Input Output TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be configured as open-drain or pull-up input. TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be configured as open-drain or push-pull output To indicate module s working status & wakes up the external MCU. Output During the procedure of self-check initialization, the pin outputs low level. Can be configured as push-pull output (suspending is allowed). Power supply 2.3~ 5.2V DC Ground Ground Ground Ground Antenna Ground Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 7 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 4. Connect to MCU No. 1 2 The UART module is TTL level. DescriptionSTM8L MCU For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin. 5 Function description 5.1 Fixed transmission Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 8 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 5.2 Broadcasting transmission 5.3 Broadcasting address For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;

When module is the transmitter (transparent transmission), all modules under channel 0x04 will receive the data, the purpose of broadcast is realized. 5.4 Monitor address For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;

When module A is the receiver, it can receive the data sent from all modules under channel 0x04, the purpose of monitor is realized. 5.5 Reset When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the operating mode based on users parameters. During the process, the AUX remains low level. After the process completed, the AUX outputs high level and starts to work as per the operating mode combined by M1 and M0. Therefore, users need to wait the AUX rising edge as the start of modules normal work. Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 9 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 5.6 AUX description AUX Pin can be used as indication for wireless send & receive buffer and self-check. It can indicate whether there are data that are not sent yet via wireless way, or whether all wireless data has been sent through UART, or whether the module is still in the process of self-check initialization. 5.6.1 Indication of UART output To wake up external MCU 5.6.2 Indication of wireless transmitting Buffer (empty): the internal 1000 bytes data in the buffer are written to the RFIC (Auto sub-packaging). When AUX=1, the user can input data less than 1000 bytes continuously without overflow. Buffer (not empty): when AUX=0, the internal 1000 bytes data in the buffer have not been written to the RFIC completely. If the user starts to transmit data at this circumstance, it may cause overtime when the module is waiting for the user data, or transmitting wireless sub package.When AUX = 1, it does not mean that all the UART data of the module have been transmitted already, perhaps the last packet of data is still in transmission. Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 10 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 5.6.3 Configuration procedure of module Only happened when power-on resetting or exiting sleep mode 5.6.4 Notes for AUX No. 1 2 3 4 Description For function 1 & function 2 mentioned above, the priority should be given to the one with low level output, which means if it meets each of any low level output condition, AUX outputs low level, if none of the low level condition is met, AUX outputs high level. When AUX outputs low level, it means the module is busy & cannot conduct operating mode checking. Within 1ms since AUX outputs high level, the mode switch will be completed. After switching to new operating mode, it will not work in the new mode immediately until AUX rising edge lasts for 2ms . If AUX stays on the high level, the operating mode switch can be effected immediately. When the user switches to other operating modes from mode 3 (sleep mode) or its still in reset process, the module will reset user parameters, during which AUX outputs low level. 6 Operating mode There are four operating modes, which are set by M1 and M0, the details are as follows:

Mode(0-3) M1 M0 Description Remark 0 Normal mode 1 WOR mode 2 Configuration mode 3 Deep sleep mode 0 0 1 1 0 1 0 1 UART and wireless transmission is on channel are open, transparent Supports configuration over air via special command Can be defined as WOR transmitter and WOR receiver Supports wake up over air Users can access the register through the serial port to control the working state of the module Sleep mode Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 11 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 6.1 Mode switching No. Remark Users can combine M1 and M0 with high and low levels to determine the operating mode. Two GPIOs of the MCU can be used to control mode switching;

After changing M1 and M0: If the module is idle, after 1ms, it can start working according to the new mode;

If the serial port data of the module has not been transmitted through the wireless, the new working mode can be switched after the transmission is completed;

If the module receives the wireless data and transmits the data through the serial port, transmission before switching the new working mode;

Therefore, mode switching can only be valid when AUX output is 1, otherwise it will delay switching. it needs to finish For example, users continuously inputs a large amount of data and simultaneously performs mode switching. At this time, the switching mode operation is invalid; the module will process all the user data before performing the new mode detection;

Therefore, the general recommendation is to detect the output state of the AUX pin and switch after 2ms when the output is high. When the module is switched from other modes to sleep mode, if the data has not been processed yet;

The module will process these data (including receiving and sending) before entering sleep mode. This feature can be used for fast sleep, which saves power; for example, the transmitter module works in mode 0, the user transmits the serial port data "12345", and then does not have to wait for the AUX pin to be idle (high level), and can directly switch to sleep mode. And the user's main MCU immediately sleeps, the module will automatically transmit the user data through the wireless, and automatically enters sleep within 1ms;

This saves MCU's working time and reduces power consumption. Similarly, any mode switching can use this feature. After the module processes the current mode event, it will automatically enter the new mode within 1ms; thus eliminating the need for the user to query AUX and achieve the purpose of fast switching;

For example, switching from the transmit mode to the receive mode; the user MCU can also enter sleep before the mode switch, and use the external interrupt function to acquire the AUX change, thereby performing mode switching. This operation mode is very flexible and efficient, and is designed according to the user's MCU's operation convenience, and can reduce the workload of the entire system as much as possible, improve system efficiency, and reduce power consumption. 1 2 3 4 5 6.2 Normal modeMode 0 Type M0 = 0M1 = 0 Transmitting Users can input data through the serial port and the module will start wireless transmission. Receiving The module wireless receiving function is turned on, and after receiving the wireless data, it will be output through the serial port TXD pin. Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 12 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 6.3 WOR modeMode 1 Type M0 = 1M1 =0 Transmitting When defined as a transmitting party, a preamble is automatically added before transmitting. Receiving It can receive data normally, the receiving function is the same as mode 0. 6.4 Configuration modeMode 2 Type M0 = 0M1 = 1 Transmitting Wireless transmitting off Receiving Wireless receiving off Configuration Users can access the registers to configure the module's operation state. 6.5 Deep sleep modeMode 3 Type M0 = 1M1 = 1 Transmitting Unable to transmit wireless data Receiving Unable to receive wireless data Note When from the sleep mode to other modes, the module will reconfigure the parameters. During the configuration process, AUX will remain low; After configuration,it outputs high level, we suggest that user test rising edge T_BUSY. 7 Hardware design It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small as possible, and the module needs to be reliably grounded. Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse connection may cause permanent damage to the module Please check the power supply to ensure it is within the recommended voltage otherwise when it exceeds the maximum value the module will be permanently damaged Please check the stability of the power supply, the voltage can not be fluctuated frequently When designing the power supply circuit for the module, it is often recommended to reserve more than 30%

Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 13 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual of the margin, so the whole machine is beneficial for long-term stable operation. The module should be as far away as possible from the power supply, transformers, high-frequency wiring and other parts with large electromagnetic interference. High-frequency digital routing, high-frequency analog routing, and power routing must be avoided under the module. If it is necessary to pass through the module, assume that the module is soldered to the Top Layer, and the copper is spread on the Top Layer of the module contact part(well grounded), it must be close to the digital part of the module and routed in the Bottom Layer Assuming the module is soldered or placed over the Top Layer, it is wrong to randomly route over the Bottom Layer or other layers, which will affect the module's spurs and receiving sensitivity to varying degrees It is assumed that there are devices with large electromagnetic interference around the module that will greatly affect the performance. It is recommended to keep them away from the module according to the strength of the interference. If necessary, appropriate isolation and shielding can be done Assume that there are traces with large electromagnetic interference (high-frequency digital, high-frequency analog, power traces) around the module that will greatly affect the performance of the module. It is recommended to stay away from the module according to the strength of the interference.If necessary, appropriate isolation and shielding can be done. If the communication line uses a 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is still a risk of damage) Try to stay away from some physical layers such as TTL protocol at 2.4GHz , for example: USB3.0 The mounting structure of antenna has a great influence on the performance of the module. It is necessary to ensure that the antenna is exposed, preferably vertically upward. When the module is mounted inside the case, use a good antenna extension cable to extend the antenna to the outside The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly weakened. 8 FAQ 8.1 Communication range is too short The communication distance will be affected when obstacle exists. Data lose rate will be affected by temperature, humidity and co-channel interference. The ground will absorb and reflect wireless radio wave, so the performance will be poor when testing near ground. Sea water has great ability in absorbing wireless radio wave, so performance will be poor when testing near the sea. The signal will be affected when the antenna is near metal object or put in a metal case. Power register was set incorrectly, air data rate is set as too high (the higher the air data rate, the shorter the distance). The power supply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the transmitting power. Due to antenna quality or poor matching between antenna and module. Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 14 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 8.2 Module is easy to damage Please check the power supply source, ensure it is 2.0V~3.6V, voltage higher than 3.6V will damage the module. Please check the stability of power source, the voltage cannot fluctuate too much. Please make sure antistatic measure are taken when installing and using, high frequency devices have electrostatic susceptibility. Please ensure the humidity is within limited range, some parts are sensitive to humidity. Please avoid using modules under too high or too low temperature. 8.3 BER(Bit Error Rate) is high There are co-channel signal interference nearby, please be away from interference sources or modify frequency and channel to avoid interference;

Poor power supply may cause messy code. Make sure that the power supply is reliable. The extension line and feeder quality are poor or too long, so the bit error rate is high;

9 Production guidance 9.1 Reflow soldering temperature Profile Feature Curve characteristics Sn-Pb Assembly Solder Paste Preheat Temperature min Tsmin Preheat temperature max (Tsmax) Preheat Time (Tsmin to Tsmax)(ts) Solder paste Min preheating temp. Mx preheating temp. Sn63/Pb37 100 150 Pb-Free Assembly Sn96.5/Ag3/Cu0.5 150 200 Preheating time 60-120 sec 60-120 sec Average ramp-up rate(Tsmax to Tp) Average ramp-up rate 3/second max 3/second max Liquidous Temperature (TL) Liquid phase temp. TimetLMaintained AboveTL Time below liquid phase line Peak temperatureTp Peak temp. 183 60-90 sec 220-235 217 30-90 sec 230-250 Aveage ramp-down rateTp to Tsmax Aveage ramp-down rate 6/second max 6/second max Time 25 to peak temperature Time to peak temperature for 25 max 6 minutes max 8 minutes Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 15 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 9.2 Reflow soldering curve 10 Antenna recommendation The antenna is an important role in the communication process. A good antenna can largely improve the wireless modules with excellent communication system. Therefore, we recommend some antennas for performance and reasonable price. Model No. Type TX433-JK-20 Rubber antenna Frequency Hz Interface Gain dBi Height Cable 434M SMA-J 3 210mm

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Function feature Flexible

&omnidirectional Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 16 Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S User manual 11 Package for batch order Revision history Version 1.00 1.10 1.20 1.21 1.30 Date 2018-01-08 2018-04-16 2018-05-24 2018-07-20 2018-10-23 About us Description Initial version Content updated Content updated Model name revised Model No. split Issued by huaa huaa Huaa Huaa Huaa Technical support: support@cdebyte.com Documents and RF Setting download link: www.ebyte.com Thank you for using Ebyte products! Please contact us with any questions or suggestions: info@cdebyte.com

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Fax: 028-64146160 ext. 821 Web: www.ebyte.com Address: Innovation Center D347, 4# XI-XIN Road,Chengdu, Sichuan, China Copyright 20122018Chengdu Ebyte Electronic Technology Co.,Ltd. 17 FCC Statement 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. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. FCC Radiation Exposure Statement This modular complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. This modular must be installed and operated with a minimum distance of 20 cm between the radiator and user body. If the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains Transmitter Module FCC ID: 2ALPH-E22400T22S Or Contains FCC ID: 2ALPH-E22400T22S When the module is installed inside another device, the user manual of the host must contain below warning statements;

1. 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.

(2) This device must accept any interference received, including interference that may cause undesired operation. 2. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. The devices must be installed and used in strict accordance with the manufacturer's instructions as described in the user documentation that comes with the product. IP EX antenna port dont connect to all circuit and permanent disable function in device with FCC ID:

2ALPH-E22400T22S