Ebyte E22-400T33S User manual

E22-400T33S User Manual
SX1262 433/470MHz 2W LoRa Wireless Module

CONTENTS
1. OVERVIEW............................................................................................................................................3
1.1 INTRODUCTION ....................................................................................................................................................................................... 3
1.2 FEATURES .................................................................................................................................................................................................3
1.3 APPLICATION ........................................................................................................................................................................................... 4
2. SPECIFICATION AND PARAMETER ............................................................................................ 4
2.1 LIMIT PARAMETER..................................................................................................................................................................................4
2.2 OPERATING PARAMETER ....................................................................................................................................................................... 4
3 SIZE AND PIN DEFINITION ..............................................................................................................5
4. CONNECT TO MCU ............................................................................................................................ 6
5 FUNCTION DESCRIPTION ................................................................................................................7
5.1 FIXED TRANSMISSION ........................................................................................................................................................................... 7
5.2 BROADCASTING TRANSMISSION ......................................................................................................................................................... 7
5.3 BROADCASTING ADDRESS ....................................................................................................................................................................7
5.4 MONITOR ADDRESS ............................................................................................................................................................................... 8
5.5 RESET ........................................................................................................................................................................................................8
5.6 AUX DESCRIPTION ................................................................................................................................................................................ 8
5.6.1 Indication of UART output ..........................................................................................................................................................8
5.6.2 Indication of wireless transmitting ........................................................................................................................................... 8
5.6.3 Configuration procedure of module .......................................................................................................................................10
5.6.4 Notes for AUX ..............................................................................................................................................................................10
6 OPERATING MODE ...........................................................................................................................10
6.1 MODE SWITCHING ............................................................................................................................................................................... 11
6.2 NORMAL MODE（MODE 0）............................................................................................................................................................11
6.3 WOR TRANSMITTING MODE（MODE 1）.....................................................................................................................................12
6.4 CONFIGURATION MODE（MODE 2）..............................................................................................................................................12
6.5 DEEP SLEEP MODE（MODE 3）.......................................................................................................................................................12
7 REGISTER READ AND WRITE CONTROL ............................................................................... 12
7.1 COMMAND FORMAT.............................................................................................................................................................................12
7.2 REGISTER DESCRIPTION ..................................................................................................................................................................... 13
7.3 FACTORY DEFAULT PARAMETER ........................................................................................................................................................16
8 REPEATER NETWORKING MODE ..............................................................................................16

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9 CONFIGURATION INSTRUCTIONS ON COMPUTER ............................................................17
9 HARDWARE DESIGN ........................................................................................................................18
10 FAQ ....................................................................................................................................................... 19
10.1 COMMUNICATION RANGE IS TOO SHORT ......................................................................................................................................19
10.2 MODULE IS EASY TO DAMAGE ....................................................................................................................................................... 19
10.3 BER(BIT ERROR RATE)IS HIGH ..................................................................................................................................................19
11 PRODUCTION GUIDANCE ............................................................................................................19
11.1 REFLOW SOLDERING TEMPERATURE ............................................................................................................................................. 19
11.2 REFLOW SOLDERING CURVE ............................................................................................................................................................20
12 E22 SERIES ......................................................................................................................................... 20
13 ANTENNA RECOMMENDATION................................................................................................ 21
14 PACKAGE FOR BATCH ORDER ................................................................................................. 22
REVISION HISTORY ............................................................................................................................ 22
ABOUT US ................................................................................................................................................22

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1. Overview
1.1 Introduction
E22-400T33S is a wireless serial port module (UART) based on
SEMTECH's SX1262, working at 410.125 ～493.125MHz （default
433.125MHz）, TTL level output, compatible with 3.3V and 5V IO port
voltage.
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. An obvious advantage is that
SX1262 covers wider frequency range.
1.2 Features
SX1262 LoRa chip brings lower power consumption, further communication distance and stronger anti-interference
ability;
Bulit-in PA+LNA, communication distance tested is up to 16 km；
Maximum transmission power of 33dBm, software multi-level adjustable；
The communication allows users to set key that cannot be read, greatly improving the user data privacy;
Wireless parameters configuration, sent via wireless instruction packet, or read a wireless remote configuration
module parameter;
Air wake up, that is, ultra-low power consumption function, suitable for a battery-powered application solutions;
Supports fixed transmission, broadcasting transmission, channel monitoring;
Support deep sleep, the power consumption of the whole module in this mode is about 2uA
Supports the global license-free ISM 433MHz and 470Mhz for global meter reading；
Effective watchdog design, once an exception occurs, the module will be in automatic restart, and can continue to
work on previous parameter;
Supports RSSI for evaluating signal quality, improving communication network, and ranging;
Supports LBT for monitoring channel environmental noise before sending data, and for improving communication.
Supports air date rate of 2.4kbps～62.5kbps；
Supports 3.3V~5.5V power supply, power supply over 4.7 V can guarantee the best performance；
Industrial grade standard design, support -40 ~ 85 °C for working over a long time；
Dual antenna (IPEX and stamp hole) optional, good for secondary development and integration.

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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.
2. Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remark
Min.
Max.
Power supply（V）
3.3
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
/
2.2 Operating parameter
Main parameter
Performance
Remark
Min.
Typ.
Max.
Operating voltage（V）
3.3
5.0
5.5
≥4.7 V ensures output power
Communication level（V）
-
3.3
-
For 5V TTL, it may be at risk of burning
down
Operating temperature（℃）
-40
-
85
Industrial design
Operating frequency（MHz）
410.125
-
493.125
Support ISM band
Power
consumpti
on
TX current（mA）
850
1000
1200
Instant power consumption 33dbm
RX current（mA）
11
13
15
Sleep current （μA）
-
2
-
Software is shut down
Max Tx power（dBm）
32
33
34
Receiving sensitivity（dBm）
-126
-128
-130
Air data rate is 2.4kbos
Air data rate（bps）
2.4k
2.4k
62.5k
Controlled via user’s programming
Main parameter
Description
Remark
Distance for reference
16km
Test condition：clear and open area, antenna gain: 5dBi，

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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
Buffer
1000 Byte
Modulation
LoRa
Communication interface
UART
TTL level
Package
SMD
Connector
2.54mm
Size
25*40.5mm
Antenna
IPEX/stamp hole
50 ohm impedance
3 Size and pin definition
No.
Name
Direction
Function
1
GND
Input
Module ground
2
VCC
Input
Power supply ：3.3~ 5.5V DC
3
AUX
Output
Used to indicate the working status of the module; the user wakes up the
external MCU, and the Output is low during the power-on self-test
initialization Level; (can be left floating)
4
TXD
Output
TTL serial port output，connect to external RXD Input pin；
5
RXD
Input
TTL serial port input, connect to external TXD output pin
6
M1
Input（weak
pull-up）
work with M0, to define 4 working mode(not floated,connect to ground
when not using )
7
M0
Input（weak
pull-up）
work with M1, to define 4 working mode(not floated,connect to ground
when not using )
11
ANT
Output
Antenna, 50ohm impedance

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12
GND
-
fixed orifice
13
GND
-
fixed orifice
14
GND
-
fixed orifice
18
PB0
Input/Output
NC pins for future development, no need to connect
19
PB1
Input/Output
NC pins for future development, no need to connect
20
PB3
Input/Output
NC pins for future development, no need to connect
21
+3.3V
Input
Power pin when loading program(floated, no need to connect)
22
SWIM
Input
SWIM pin when loading program(floated, no need to connect)
23
GND
Input
Ground pin when loading program(floated, no need to connect)
24
RESET
Input
Reset pin when loading program(floated, no need to connect)
4. Connect to MCU
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.

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5 Function description
5.1 Fixed transmission
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

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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 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.
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 256 bytes data in the buffer are written to the RFIC (Auto sub-packaging). When AUX=1, the user
can input data less than 256 bytes continuously without overflow. Buffer (not empty): when AUX=0, the internal 256 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

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data of the module have been transmitted already, perhaps the last packet of data is still in transmission.

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5.6.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode
5.6.4 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.
5
Due to the characteristics of the LoRa modulation method, the information transmission delay is much longer than that of FSK.
It is recommended that customers do not transmit large amounts of data at low airspeeds, so as to avoid communication
abnormalities caused by data loss due to data accumulation.
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
0
0
UART and wireless channel are open, transparent transmission
is on
Support over-the-air configuration via
special command
1 WOR transmitting
mode
0
1
Can be defined as WOR transmitter and WOR receiver
Support wake up over air
2 Configuration mode
1
0
Users can access the registers through the serial port to control
the working status of the module
3 Deep sleep mode
1
1
Module enters sleep mode

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6.1 Mode switching
No.
Remark
1
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, it needs to finish transmission
before switching the new working mode;
Therefore, mode switching can only be valid when AUX output is 1, otherwise it will delay switching.
2
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.
3
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.
4
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.
5
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.
6.2 Normal mode（Mode 0）
Type
M0 = 0，M1 = 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.

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6.3 WOR transmitting mode（Mode 1）
Type
M0 = 1，M1 =0
Transmitting
Wireless data transmitting is enabled
Receiving
Wireless data receiving is enabled
6.4 Configuration mode（Mode 2）
Type
M0 = 0，M1 = 1
Transmitting
Wireless transmitting off
Receiving
Wireless receiving off
Configuration
Users can access the registers through the serial port to control the working status of the module
6.5 Deep sleep mode（Mode 3）
Type
M0 = 1，M1 = 1
Transmitting
Unable to transmit wireless data
Receiving
Unable to receive wireless data
Note
When entering other modes from sleep mode, the module will reconfigure parameters. During the configuration process, AUX
remains low; After completion, it outputs a high level, so it is recommended that the user detect the rising edge of AUX.
7 Register read and write control
7.1 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)：

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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
(2.4K).
Send: C0 00 04 12 34 00 61
Return: C1 00 04 12 34 00 61
2
Read register
Command: C1+starting address+ length
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
3
Set temporary
registers
Command: C2+starting address+parameters
Response: C1+starting address+length+parameters
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
(2.4K).
Send: C2 00 04 12 34 00 61
Return: C1 00 04 12 34 00 61
5
Wireless
configuration
Command: CF CF + normal command
Respond：CF CF + normal respond
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
(2.4K).
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
7.2 Register description
Address
Read or
write
Name
Description
Remark
00H
Read/Wr
ite
ADDH
ADDH（default 0）
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）

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02H
Read/Wr
ite
NETID
NETID（default 0）
Network address, used to distinguish the network.
When communicating with each other, they should
be set to the same.
03H
Read/Wr
ite
REG0
7，6，5 UART: Serial port rate（bps）
000: 1200
001: 2400
010: 4800
011: 9600（default）
100: 19200
101: 38400
110: 57600
111: 115200
---------------------------------------
4，3：Serial parity bit
00：8N1（default）
01：8O1
10：8E1
11：8N1（equal to 00）
-----------------------------------
2，1，0，air data rate
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
For the two modules that communicate with each
other, the serial port baud rate can be different, and
the verification method can also be different.
When transmitting large packets continuously, users
need to consider the data blocking caused by the
same baud rate, and data may even be lost. It is
generally recommended that both parties have the
same baud rate.
---------------------------------------
Both parties must be the same
The higher the rate, the shorter the distance
04H
Read/Wr
ite
REG1
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
00：33dbm（default）
01：30dbm
10：27dbm
11：241dbm
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.
--------------------------------------------
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 =-RSSI/2）
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
----------------------------------
Power and current are nonlinear, and power
efficiency is highest at maximum power.
The current does not decrease in proportion to the
decrease in power.

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05H
Read/Wr
ite
REG2
Channel control（CH）
0-83 represents a total of 84 channels
Frequency= 410.125 + 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
When enabled, the module receives wireless data
and it will follow an RSSI strength byte after output
via the serial port TXD
.---------------------------------------
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.
---------------------------------------
After the reply function is enabled, if the target
address is not the module itself, the module will
forward it once.
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.
----------------------------------------
When enabled, wireless data will be monitored
before it is transmitted, which can avoid interference
to a certain extent, but may cause data delay.
----------------------------------------
Valid only for mode 1.
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.
---------------------------------------------
Valid only for mode 1.
Period T = (1 + WOR) * 500ms, maximum 4000ms,
minimum 500ms
The longer the WOR monitoring interval period, the
lower the average power consumption, but the
greater the data delay
Both the transmitter and the receiver must be the
same (very important).
07H
Write
CRYPT_
H
Key high byte (default 0）
Write only, read returns 0
Used for user encryption to avoid intercepting
airborne wireless data by similar modules.
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
Product information 7 bytes

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7.3 Factory default parameter
Factory default parameters：C0 00 00 62 00 17
Model No.
Frequency
Address
Channel
Air data rate
Baud rate
Parity format
Power
E22-400T33S
410.125～
493.125MHz
0x0000
0x17
2.4kbps
9600
8N1
33dbm
8 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:
1. Forwarding rules, the repeater can forward data in both directions between two NETIDs.
2. In repeater mode, ADDH\ADDL is no longer used as the module address, and it is used as a NETID forwarding pairing flag.
Figure:
1Primary 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.
②Secondary 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.
3Two-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.

Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T33S User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
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9 Configuration instructions on computer
The following figure shows the E22-400T33S 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

Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T33S User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
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Frequency channel: 0-83
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.
9 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.

Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T33S User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
19
10 FAQ
10.1 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.
10.2 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.
10.3 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;
11 Production guidance
11.1 Reflow soldering temperature
Profile Feature
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）
100℃
150℃
Preheat temperature max (Tsmax)
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
3℃/second max
3℃/second max
Liquidous Temperature (TL)
183℃
217℃