EBYTE E22-900T22DC 868M/915M 22dBm DIP New LoRa Wireless Module User Manual

: June 6, 2024
: ebyte

EBYTE E22-900T22DC 868M/915M 22dBm DIP New LoRa Wireless Module

Overview

Introduction
E22-900T22DC is a wireless module (UART) with multiple transmission modes, working in the 850.125MHz~930.125MHz, (default 868.125MHz). It features LoRa spread spectrum technology, TTL level output, compatible with 3.3V and 5V IO port voltage. E22-900T22DC adopts a new generation of LoRa spread spectrum technology. Compared with the traditional SX1278 solution, it has a longer transmission distance, faster speed, lower power consumption, and smaller size; it supports functions such as air wake-up, wireless configuration, carrier monitoring, automatic relay. communication keys and sub-package length setting. Ebyte provides customized development services on it.

Features

New LoRa spread spectrum modulation technology brings further communication distance and stronger anti-interference ability;
Supports automatic relay network, multilevel relay used in long distance communication, the same area to run multiple network running at the same time;
he communication allows users to set key that cannot be read, greatly improving the user data privacy;
Supports LBT function, before sending channel environmental noise monitoring, can greatly increase the success rate of communication module in harsh environment;
RSSI signal strength indicator function, can be used to assess the signal quality, improve the communication network and distance;
Wireless parameters configuration, sent via wireless instruction packet, or read a wireless remote configuration module parameters;
Air wake up, that is, ultra-low power consumption function, suitable for a battery-powered application solutions;
Supports fixed transmission, radio transmission, channel to monitor;
Deep sleep mode enables 2 ua power consumption;
Global free license ISM 868/915 MHZ band;
Under ideal conditions, the communication distance can be up to 5 km;
Supports parameter electricity saving, electricity again after the module will work according to set good parameters;
Effective watchdog design, once an exception occurs, the module will be in automatic restart, and can continue to work on previous parameter;
0.3 k ~ 62.5 kbps air data rate;
2.3 V to 5.5 V power supply, over 5V power supply can ensure the best performance;
Industry-standard design, support – 40 ~ + 85 ℃ under long time use;
Size and shape are consistent with E32 series module, which can be directly replaced to improve performance and

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.

Specification and parameter

Limit parameter

Main parameter

| Performance|

Remark

---|---|---
Min.| Max.

Power supply（V）

|

0

|

5.5

| Voltage over 5.5V will cause permanent

damage to module

Blocking power（dBm）

|

–

|

10

| Chances of burn is slim when modules are

used in short distance

Operating temperature（℃）| -40| 85| /

Operating parameter

Main parameter

| Performance|

Remark

---|---|---
Min.| Typ.| Max.
Operating voltage（V）| 2.3| 5.0| 5.5| ≥5.0 V ensures output power

Communication level（V）

| |

3.3

| | For 5V TTL,It is recommended to add

level conversion

Operating temperature（℃）| -40| –| 85| Industrial design
Operating frequency（MHz）| 850.125| 868.125| 930.125| Support ISM band
Power

consumpti on

| TX current(mA)| –| 140| –| Instant power consumption
RX current (mA)| –| 11| –|
Sleep current（μA）| –| 2| –| Software is shut down
Max Tx power（dBm）| 21.5| 22.0| 22.5|
Receiving sensitivity（dBm）| -146| -147| -148| Air data rate 0.3kbps
Air data rate（bps）| 0.3k| 2.4k| 62.5k| To control via user’s program
Main parameter| Description| Remark
---|---|---

Distance for reference

|

5000m

| Test condition：clear and open area, antenna gain: 5dBi，

antenna height: 2.5m，air data rate: 2.4kbps

TX length

|

240 Byte

| Can be configured via command as 32/64/128/240 bytes

per packet to transmit

Size and pin definition

No.	Name	Direction	Function

1

| M0| Input

（weak pull-up）

| Work with M1 to decide 4 working modes of module (not suspended, if not used, could be grounded).

2

| M1| Input

（weak pull-up）

| Work with M0 to decide 4 working modes of module (not suspended, if not used, could be grounded).
3| RXD| Input| TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be

configured as open-drain or pull-up input.

4| TXD| Output| TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be
| | | configured as open-drain or push-pull output
---|---|---|---

5

| ****

AUX

| ****

Output

| To indicate module ’ s working status & wakes up the external MCU. During the procedure of self-check initialization, the pin outputs low level. Can be configured as push-pull output (suspending is allowed).

6

| ****

VCC

| ****

Input

| ****

Power supply ：2.3~ 5.5V DC

Connect to MCU

EBYTE E22-900T22DC 868M 915M 22dBm DIP New LoRa Wireless
Module 2

No.	Description （ STM8L MCU ）
1	The UART module is TTL level.
2	For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for

the TXD & AUX pin.

Function description

Fixed transmission

Broadcasting transmission

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

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.

Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the operating mode based on user’s 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 module’s normal work.

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.

Indication of UART output

To wake up external MCU

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. EBYTE E22-900T22DC 868M 915M 22dBm DIP New LoRa
Wireless Module 6

Configuration procedure of module

Only happened when power-on resetting or exiting sleep mode

Notes for AUX

No.	Description

1

| 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.

2

| 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.

3

| 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.

4

| When the user switches to other operating modes from mode 3 (sleep mode) or it’s still in reset process, the module will reset

user parameters, during which AUX outputs low level.

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	0	0	UART and wireless channel are open, transparent
transmission is on	Supports configuration over air via special command
1 WOR mode	0	1	Can be defined as WOR transmitter and WOR receiver	Supports

wake up over air
2 Configuration mode| 1| 0| Users can access the register through the serial port to control the working state of the module|
3 Deep sleep mode| 1| 1| Sleep mode|

Mode switching

1

|

l 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;

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

l 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;

l If the module receives the wireless data and transmits the data through the serial port, it needs to finish transmission before switching the new working mode;

l Therefore, mode switching can only be valid when AUX output is 1, otherwise it will delay switching.

---|---

2

|

l 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;

l Therefore, the general recommendation is to detect the output state of the AUX pin and switch after 2ms when the output is high.

3

|

l When the module is switched from other modes to sleep mode, if the data has not been processed yet;

l 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;

l This saves MCU’s working time and reduces power consumption.

4

|

l 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;

l 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.

5

|

l 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.

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.

Normal mode（Mode 0）

Type

| M0 = 0 ， M1 = 1
---|---

Transmitting

|

Wireless transmitting off

Receiving

|

Wireless receiving off

Configuration

|

Users can access the registers to configure the module’s operation state.

WOR mode（Mode 1）

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.

Configuration mode（Mode 2）

Type

| M0 = 0 ， M1 = 1
---|---

Transmitting

|

Wireless transmitting off

Receiving

|

Wireless receiving off

Configuration

|

Users can access the registers to configure the module’s operation state.

Deep sleep mode（Mode 3）

Type	M0 = 1 ， M1 = 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 AUX.

Register read and write control

Command format
In configuration mode (mode 2: M1 = 1, M0 = 0), the list of supported commands are as follows (only 9600, 8N1 format is supported when)：

No.	Command format	Description

1

|

Set register

| Command: C0+starting address+length+parameters Response: C1+starting address+length+parameters

E.g 1: Channel is 0x09

command starting address length parameter Send: C0 05 01 09

| | Returen: C1 05 01 09

E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate (1.2K).

Send: C0 00 04 12 34 00 61

Return: C1 00 04 12 34 00 61

---|---|---

2

|

Read register

| Command: C1+starting address+parameters Response: C1+starting address+length+parameters

E.g 1：Read channel

command starting address length parameter Send: C1 05 01

Returen: C1 05 01 09

E.g 2: Read module address, network address, serial port and air data rate. Send: C1 00 04

Return: C1 00 04 12 34 00 61

| | Command: C2+starting address+parameters Response: C1+starting address+length+parameters

3

|

Set temporary registers

| E.g 1: Channel is 0x09

command starting address length parameter Send: C2 05 01 09

Returen: C1 05 01 09

| | E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate (1.2K).

Send: C2 00 04 12 34 00 61

Return: C1 00 04 12 34 00 61

| | Command: CF CF + normal command Respond：CF CF + normal respond

5

|

Wireless configuration

| E.g 1: Channel is 0x09

Command head command starting address length parameter Send: CF CF C0 05 01 09

Returen: CF CF C1 05 01 09

| | E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate (1.2K).

Send: CF CF C2 00 04 12 34 00 61

Return: CF CF C1 00 04 12 34 00 61

6

|

Wrong format

|

Wrong format respond: FF FF FF

| | Returen: C1 05 01 09

E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate (1.2K).

Send: C0 00 04 12 34 00 61

Return: C1 00 04 12 34 00 61

2

|

Read register

| Command: C1+starting address+parameters Response: C1+starting address+length+parameters

E.g 1：Read channel

command starting address length parameter Send: C1 05 01

Returen: C1 05 01 09

E.g 2: Read module address, network address, serial port and air data rate. Send: C1 00 04

Return: C1 00 04 12 34 00 61

| | Command: C2+starting address+parameters Response: C1+starting address+length+parameters

3

|

Set temporary registers

| E.g 1: Channel is 0x09

command starting address length parameter Send: C2 05 01 09

Returen: C1 05 01 09

| | E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate (1.2K).

Send: C2 00 04 12 34 00 61

Return: C1 00 04 12 34 00 61

| | Command: CF CF + normal command Respond：CF CF + normal respond

5

|

Wireless configuration

| E.g 1: Channel is 0x09

Command head command starting address length parameter Send: CF CF C0 05 01 09

Returen: CF CF C1 05 01 09

| | E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate (1.2K).

Send: CF CF C2 00 04 12 34 00 61

Return: CF CF C1 00 04 12 34 00 61

6

|

Wrong format

|

Wrong format respond: FF FF FF

Register description

Address	Read or write	Name	Description	Remark
00H	Read/Wr ite	ADDH	ADDH（default 0）	l The module address is high byte

and low byte. Note: When the module address is FFFF, it can be used as the broadcast and monitor address, that is the module will not perform address filtering.
01H| Read/Wr ite| ADDL| ADDL（default 0）

02H

| Read/Wr ite|

NETID

|

NETID（default 0）

| l Network address, used to distinguish the network. When communicating with each other, they should be set to the same.
| | | 7，6，5 UART: Serial port rate（bps）|
---|---|---|---|---
| | | 000: 1200|
| | | 001: 2400|
| | | 010: 4800|
| | | 011: 9600（default）|
| | | 100: 19200|
| | | 101: 38400

110: 57600

|

l For the two modules that communicate with each

| | | 111: 115200| other, the serial port baud rate can be different, and

the verification method can also be different.

03H

|

Read/Wr ite

|

REG0

| 00：8N1（default） 01：8O1

10：8E1

| generally recommended that both parties have the

same baud rate.

———————————–

|

l Both parties must be the same

| | | 2，1，0，air data rate| l The higher the rate, the shorter the distance
| | | 000: 0.3k|
| | | 001: 1.2k|
| | | 010: 2.4k（default）|
| | | 011: 4.8k|
| | | 100: 9.6k|
| | | 101: 19.2k|
| | | 110: 38.4k|
| | | 111: 62.5k|
| | |

7，6： Sub packet setting

00: 240 bytes（default）

01: 128 bytes

10: 64 bytes

11: 32 bytes

5 ：RSSI Ambient noise enable 1: Enable

0: Disable（default）

————————————–

4，3，2 Reserve

————————————–

1，0： Transmitting power

00：22dbm（default） 01：17dbm 10：13dbm 11：10dbm

|

l When the data is smaller than the sub packet length, the serial output of the receiving end is an uninterrupted continuous output.

When the data is larger than the sub packet length, the receiving end serial port will output the sub packet.

04H

|

Read/Wr ite

|

REG1

|

l When enabled, the C0 C1 C2 C3 command can be sent in the transmitting mode or WOR transmitting mode to read the register.

Register 0x00: Current ambient noise rssi Register 0X01: rssi when the data was received last

time.

（Current channel noise is: dBm = -（256 – RSSI））

| | | Command format: C0 C1 C2 C3 + starting address + read length

Returns: C1 + address address + read length + read valid value

E.g: send C0 C1 C2 C3 00 01

Return C1 00 01 rssi

| | | l Power and current are nonlinear, and power efficiency is highest at maximum power.

l The current does not decrease in proportion to the decrease in power.

05H

| Read/Wr ite|

REG2

| Channel control（CH）

0-80 represents a total of 81 channels

|

l Frequency= 850.125 + CH *1M

06H

|

Read/Wr ite

|

REG3

| 7 Enable RSSI 1：Enable

0：Disable（default）

————————————–

6， Fixed point transmission 1：Fixed point transmission mode

0 ： Transparent transmission mode

（default）

5 Enable reply

1：Enable repeater function 0：Disable repeater function

————————————–

4 LBT enable byte (monitor before transmission)

1：Enable 0：Disable（default）

__

3 WOR transceiver control 1：WOR transmitter

The module receiving and transmitting functions are turned on, and a wake-up code is added when transmitting data. Receiving is turned on.

0：WOR receiver（default）

The module is unable to transmit data and works in WOR monitoring mode. The monitoring period is as follows (WOR cycle), which can save a lot of power.

—————————————

2，1，0，WOR cycle

000：500ms

001：1000ms

010：1500ms 011：2000ms（default） 100：2500ms

101：3000ms

110：3500ms

111：4000ms

|

l When enabled, the module receives wireless data and it will follow an RSSI strength byte after output via the serial port TXD

.—————————————

l The module recognizes the first three bytes of the serial data as: address high + address low + channel and takes it as the wireless transmitting target.

l After the reply function is enabled, if the target address is not the module itself, the module will forward it once.

l In order to prevent data return-back, it is recommended to use it in conjunction with the fixed point mode. That is: the target address is different from the source address.

—————————————-

l When enabled, wireless data will be monitored before it is transmitted, which can avoid interference to a certain extent, but may cause data delay.

—————————————-

l Valid only for mode 1.

l After the WOR receiver receives the wireless data and outputs it through the serial port, it will wait for 1000ms before entering the WOR again. Users can input the serial port data and return it via the wireless during this period. Each serial byte will be refreshed for 1000ms. Users must transmit the first byte within 1000ms.

———————————————

l Valid only for mode 1.

l Period T = (1 + WOR) * 500ms, maximum 4000ms, minimum 500ms

l The longer the WOR monitoring interval period, the lower the average power consumption, but the greater the data delay

l Both the transmitter and the receiver must be the same (very important).

---|---|---|---|---

07H

|

Write

|

CRYPT_ H

| Key high byte (default 0）| l Write only, read returns 0

l Used for user encryption to avoid intercepting airborne wireless data by similar modules.

l The module will internally use these two bytes as a calculation factor to transform and encrypt the over-the-air wireless signal.

08H

|

Write

|

CRYPT_ L

|

Key low byte (default 0)

80H~

86H

| Read only| PID| Product information 7 bytes| l Product information 7 bytes

Factory default parameter

Model No.| Frequency| Address| Channel| Air data rate| Baud rate| Parity format| Power
---|---|---|---|---|---|---|---

E22-900T22DC

|

868.125MHz

|

0x0000

|

0x12

|

2.4kbps

|

9600

|

8N1

|

22dbm

Repeater networking mode

No.	Description
1	After setting the repeater mode by configuration, switch to the normal mode

and the repeater starts working.
2| In the repeater mode, ADDH, ADDL are no longer used as the module address, but is correspondingly paired with the NETID. If the data of one of the networks is received, it is forwarded to another network. The network ID of the repeater itself is invalid.
3| In repeater mode, the repeater module cannot transmit and receive data, and cannot perform low-power operation.
4| The user enters the other mode from mode 3 (sleep mode) or during the reset process, the module resets the user parameters during which the AUX outputs low level.

Repeater networking rules:

Forwarding rules, the repeater can forward data in both directions between two NETIDs.
In repeater mode, ADDH\ADDL is no longer used as the module address, and it is used as a NETID forwarding pairing flag.
Figure:
Primary repeater
- “Node 1” NETID is 08.
- “Node 2” NETID is 33.
  Primary repeater 1‘s ’ADDH\ADDL are 08，33. So the signal sent by node 1 (08) can be forwarded to node 2 (33) At the same time, node 1 and node 2 have the same address, so the data transmitted by node 1 can be received by node 2.
- Secondary repeater
  Secondary repeater’s ADDH\ADDL are 33，05. Therefore, Repeater 2 can forward the data of Repeater 1 to the network NETID: 05. Thus node 3 and node 4 can receive node 1 data. Node 4 outputs data normally, and node 3 has a different address than node 1, so no data is output.
- Two-way repeater
  As shown in the figure: the data sent by node 1, the nodes 2, 4 can receive the data sent by node 2, 4, and node 1 can also receive it.

EBYTE E22-900T22DC 868M 915M 22dBm DIP New LoRa Wireless Module
8

Configuration instructions on computer

The following figure shows the E22-900T22DC configuration host computer display interface, the user can switch to the command mode through M0M1, and quickly configure and read the parameters on computer.
In the configuration on computer, the module address, frequency channel, network ID, and key are all in decimal mode. The range of values of each parameter is:
- Network address: 0-65535
- Frequency channel: 0-80
- Network ID: 0-255
- Key: 0-65535
When the user configures the repeater mode using the host computer, special attention must be paid. Since the parameters are in decimal mode in the host computer, the module address and network ID need to be converted into hexadecimal. For example, if the network ID input by the transmitting end A is 02, and the network ID input by the receiving end B is 10, when the repeater end R sets the module address, the hexadecimal value 0X020A is converted into the decimal value 522 as the repeater end R. Module address. That is, the module address value of the repeater terminal R is 522 at this time.

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% 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.

FAQ

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.

Module is easy to damage

Please check the power supply source, ensure it is in right range, voltage higher than max value 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.

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;

12 Production guidance

Reflow soldering temperature

Profile Feature	Curve characteristics	Sn-Pb Assembly	Pb-Free Assembly
Solder Paste	Solder paste	Sn63/Pb37	Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）	Min preheating temp.	100℃	150℃
Preheat temperature max (Tsmax)	Mx preheating temp.	150℃	200℃
Preheat Time (Tsmin to Tsmax)(ts)	Preheating time	60-120 sec	60-120 sec
Average ramp-up rate(Tsmax to Tp)	Average ramp-up rate	3℃/second max

Time 25℃ to peak temperature

| Time to peak temperature for

25℃

|

max 6 minutes

|

max 8 minutes

Reflow soldering curve

E22 series

Model No.

| ****

Core IC

| Frequency

Hz

| Tx power

dBm

| Distance

km

| ****

Package

| Size

mm

| ****

Interface

---|---|---|---|---|---|---|---
E22-900T22S| SX1262| 868M 915M| 22| 7| SMD| 1626| UART
E22-230T22S| SX1262| 230M| 22| 7| SMD| 1626| UART
E22-400T22S| SX1268| 430M 470M| 22| 7| SMD| 1626| UART
E22-400M30S| SX1268| 433M 470M| 30| 12| SMD| 2438.5| SPI
E22-900M30S| SX1262| 868M 915M| 30| 12| SMD| 2438.5| SPI
E22-900M22S| SX1262| 868M 915M| 22| 6.5| SMD| 1420| SPI
E22-400M22S| SX1268| 433M 470M| 22| 6.5| SMD| 1420| SPI
E22-230T30S| SX1262| 230M| 30| 10| SMD| 40.525| UART
E22-400T30S| SX1268| 430M 470M| 30| 10| SMD| 40.525| UART
E22-900T30S| SX1262| 868M 915M| 30| 10| SMD| 40.525| UART

Antenna recommendation

The antenna is an important role in the communication process. A good antenna can largely improve the communication system. Therefore, we recommend some antennas for wireless modules with excellent performance and reasonable price.

Model No.

|

Type

| Frequency

Hz

|

Interface

| Gain

dBi

|

Height

|

Cable

|

Function feature

---|---|---|---|---|---|---|---

TX868-XPL-100

| Sucker

antenna

|

868M

|

SMA-J

|

3.5

|

29cm

|

100cm

|

Sucker antenna, High gain

TX868-JK-20

| Rubber

antenna

|

868M

|

SMA-J

|

3

|

200mm

|

–

|

Flexible &omnidirectional

TX868-JZ-5

| Rubber

antenna

|

868M

|

SMA-J

|

2

|

50mm

|

–

| Short straight

&omnidirectional

TX915-XPL-100

| Sucker

antenna

|

915M

|

SMA-J

|

3.5

|

25cm

|

100cm

|

Sucker antenna, High gain

TX915-JK-20

| Rubber

antenna

|

915M

|

SMA-J

|

3

|

210mm

|

–

|

Flexible &omnidirectional

TX915-JK-11

| Rubber

antenna

|

915M

|

SMA-J

|

2.5

|

110mm

|

–

|

Flexible &omnidirectional

TX915-JZ-5

| Rubber

antenna

|

915M

|

SMA-J

|

2

|

50mm

|

–

| Short straight

&omnidirectional

Package for bulk order

EBYTE E22-900T22DC 868M 915M 22dBm DIP New LoRa
Wireless Module 11

Revision history

Version	Date	Description	Issued by
1.00	2021-4-2	Initial version	Linson

About us
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
Official hotline :028-61399028
Web: www.ebyte.com
Address: , Building B5, Mould Industrial Park, 199# Xiqu Ave, High-tech Zone, Chengdu, 611731, Sichuan, China