Ebyte E28-2G4M27SX User manual

E28-2G4M27SX User Manual
SX1280 2.4GHz 500mW SPI High-speed LoRa module

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
1
CONTENTS
Chapter 1 Product Overview................................................................................................................................................. 3
1.1 Product Introduction....................................................................................................................................................3
1.2 Features and Functions ............................................................................................................................................... 3
1.3 Application..................................................................................................................................................................4
Chapter 2 Technical Parameters ...............................................................................................................................................4
2.1 Limit parameters......................................................................................................................................................4
2.2 Working parameters................................................................................................................................................. 4
Chapter 3 Mechanical Dimensions and Pin Definition ..................................................................................................... 5
Chapter 4 Basic Operations........................................................................................................................................................5
4.1 Hardware design........................................................................................................................................................ 6
4.2 Software editing......................................................................................................................................................7
Chapter 5 Basic Applications ..................................................................................................................................................... 8
5.1 Basic circuit.............................................................................................................................................................8
Chapter 6 FAQ................................................................................................................................................................................ 9
6.1 Communication range is too short.................................................................................................................9
6.2 Module is easy to damage................................................................................................................................... 9
6.3 Bit error rate is too high...............................................................................................................................9
Chapter 7 Welding Operation Guidance ............................................................................................................................ 10
7.1 Reflow temperature...............................................................................................................................................10
7.2 Reflow soldering curve......................................................................................................................................11
Chapter 8 Related Models....................................................................................................................................................11
Chapter 9 Antenna Guidelines ................................................................................................................................................12
9.1 Antenna recommendation......................................................................................................................................12
Revise History ................................................................................................................................................................................12
About us.........................................................................................................................................................................................13

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
2
Disclaimer and Copyright Notice
Information in this document, including URL addresses for reference, is
subject to change without notice. Documentation is provided "as is" without
warranty of any kind, including any warranties of merchantability, fitness for
a particular purpose, or non-infringement, and any warranties referred to
elsewhere in any proposal, specification or sample. No liability is assumed in
this document, including any liability for infringement of any patent rights
arising out of the use of the information in this document. This document does
not hereby grant, by estoppel or otherwise, any license, express or implied,
to any intellectual property rights.
The test data obtained in this article are all obtained by the Ebyte
laboratory test, and the actual results may be slightly different.
All trade names, trademarks and registered trademarks mentioned herein are
the property of their respective owners and are hereby acknowledged.
The final interpretation right belongs to Chengdu Ebyte Electronic
Technology Co., Ltd.
Notice:
Due to product version upgrade or other reasons, the contents of this manual may be changed. Ebyte
Electronic Technology Co., Ltd. reserves the right to modify the contents of this manual without any notice
or prompt. This manual is only used as a guide. Chengdu Ebyte Electronic Technology Co., Ltd. does its
best to provide accurate information in this manual. However, Chengdu Ebyte Electronic Technology Co.,
Ltd. does not ensure that the contents of the manual are completely error-free. All statements in this
manual, information and advice do not create any express or implied warranties.

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
3
Chapter 1 Product Overview
1.1 Product Introduction
E28-2G4M27SX is a 2.4GHz RF transceiver module designed and
produced by Ebyte Company, with a transmit power of 500mW, SPI
interface, and extremely low current consumption in low-power mode;
the module is a small-volume SMD type (pin spacing 1.27mm) , using
52MHz industrial-grade high-precision low-temperature drift
crystal oscillator to ensure its industrial characteristics and its
stable performance.
Using Semtech's SX1280 radio frequency chip, this chip contains a
variety of physical layers and a variety of modulation methods, such as LoRa, FLRC, GFSK, and is compatible with
Bluetooth protocols; special modulation and processing methods make LoRa and FLRC modulation The transmission distance
has significant Improvement, built-in power amplifier (PA) and low noise amplifier (LNA) on the basis of the original,
so that the maximum transmit power reaches 500mW and the receiving sensitivity is further improved, and the overall
communication stability is compared with no power amplifier and low Noise amplifier products have been greatly improved;
excellent low-power performance, on-chip DC-DC and Time-of-flight make this chip powerful and can be used in smart
homes, security systems, location tracking, wireless ranging, wearable devices, Smart bracelets and health management,
etc. SX1280 supports RSSI, users can realize in-depth secondary development according to their needs, and also
integrates time of flight, which is suitable for ranging function.
E28-2G4M27SX is a pure RF transceiver module, which needs to be driven by MCU or use a dedicated SPI debugging tool.
1.2 Features and Functions
Under ideal conditions, the communication distance can reach 8km;
Built-in PA+LNA, maximum transmit power 500mW;
Compatible with BLE protocol;
Support license-free ISM 2.4GHz frequency band;
Support data transmission rate of 0.595k～2Mbps;
Support multiple modulation modes（GFSK Mode，FLRC Mode，LoRa Mode）;
Support 2.5 ~ 3.6V power supply, more than 3.3V power supply can ensure the best performance;
Adjustable air rate, up to 1.3Mbps under FLRC modulation;
Excellent anti-blocking properties;
Ranging, with Time-of-flight function.

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
4
1.3 Application
Smart home and industrial sensors, etc;
Security system, positioning system;
Wireless remote control, drone;
Wireless game remote;
Healthcare products;
Wireless voice, wireless headset;
Automotive industry applications.
Chapter 2 Technical Parameters
2.1 Limit parameters
Main parameters
Performance
Remark
Min
Max
Supply voltage (V)
0
3.6
Exceeding 3.6V will permanently burn the module
Blocking power (dBm)
-
10
The probability of burning at close range is
small
Working temperature (℃)
-40
+85
Industrial grade
2.2 Working parameters
Main parameters
Performance
Remark
Min
Typ
Max
Working voltage (V)
2.5
3.3
3.6
≥3.3V can guarantee output power
Communication level (V)
3.3
Risk of burnout with 5V TTL
Working temperature (℃)
-40
-
85
Industrial grade design
Working frequency band (MHz)
2400
2450
2500
Support ISM band
Power
consumption
Emission current (mA)
580
Instantaneous power consumption
Receive current (mA)
14.5
Sleep current (μA)
2.0
software shutdown
Maximum transmit power (dBm)
26
26.5
27
See section 4.2 for details
Receive Sensitivity (dBm)
-130
-131
-132
LoRa receiver sensitivity with CR=4/5
and high sensitivity mode enabled 1
SF12,BW=203kHz
Air Rate
LoRa（bps）
0.595k
-
253.9k
User programmable customization
FLRC（bps）
260k
-
1.3M
User programmable customization
GFSK（bps）
125k
-
2M
User programmable customization

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
5
Main parameters
Description
Remark
Reference Distance
8000m
Clear and open, antenna gain 5dBi, antenna height 2.5 meters,
air rate 1kbps
FIFO
256Byte
The maximum length of a single transmission
Crystal Frequency
52MHz
±10ppm/11pF
Modulation
LoRa(recommend)
GFSK，FLRC，LoRa
Packaging Method
SMD
Interface
1.27mm
Communication Interface
SPI
0～10Mbps
Dimensions
15*20mm
Antenna Interface
IPEX/PCB
Equivalent impedance is about 50Ω
Chapter 3 Mechanical Dimensions and Pin Definition
Pin
Number
Pin item
Pin
Orientation
Application
1
VCC
Power supply, range 2.5~3.6V (recommended to add external ceramic filter
capacitor)
2
GND
Ground wire, connected to the power reference ground

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
6
3
MISO_TX
Output
SPI data output pin; can also be used as UART transmit pin (see SX1280 manual
for details)
4
MOSI_RX
Input
SPI data input pin; can also be used as a UART receive pin (see SX1280 manual
for details)
5
SCK_RTSN
Input
SPI clock input pin; can also be used as a UART request to transmit pin
(see SX1280 manual for details)
6
NSS_CTS
Input
Module chip select pin, used to start an SPI communication; also used for
UART clear transmit pin (See SX1280 manual for details)
7
GND
Ground wire, connected to the power reference ground
8
RX_EN
Input
LNA control pin, active high
9
TX_EN
Input
PA control pin, active high
10
GND
Ground wire, connected to the power reference ground
11
NRESET
Input
Chip reset trigger input pin, active low, built-in pull-up resistor 50K
12
BUSY
Output
Used for status indication (see SX1280 manual for details)
13
DIO1
Input/Output
Configurable general-purpose IO ports (see SX1280 manual for details)
14
DIO2
Input/Output
Configurable general-purpose IO ports (see SX1280 manual for details)
15
DIO3
Input/Output
Configurable general-purpose IO ports (see SX1280 manual for details)
16
GND
Ground wire, connected to the power reference ground
Chapter 4 Basic Operations
4.1 Hardware design
It is recommended to use a DC regulated power supply to supply power to the module, the power supply
ripple coefficient should be as small as possible, and the module should be grounded reliably;
Please pay attention to the correct connection of the positive and negative poles of the power supply,
such as reverse connection may cause permanent damage to the module;
Please check the power supply to ensure that it is between the recommended power supply voltages.
If it exceeds the maximum value, the module will be permanently damaged;
Please check the stability of the power supply, the voltage should not fluctuate greatly and
frequently;
When designing the power supply circuit for the module, it is often recommended to reserve more than
30% of the margin, so that the whole machine can work stably for a long time;
The module should be kept as far away as possible from the power supply, transformer, high-frequency
wiring and other parts with large electromagnetic interference;
High-frequency digital traces, high-frequency analog traces, and power traces must avoid the
underside of the module. If it is absolutely necessary to pass under the module, assuming that the
module is soldered on the Top Layer, lay copper on the Top Layer of the contact part of the module.
Copper and well grounded), must be close to the digital part of the module and routed on the Bottom
Layer;

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
7
Assuming that the module is soldered or placed on the Top Layer, it is also wrong to arbitrarily
route wires on the Bottom Layer or other layers, which will affect the stray and receiving sensitivity
of the module to varying degrees;
Assuming that there are devices with large electromagnetic interference around the module, it will
also greatly affect the performance of the module. It is recommended to stay away from the module
according to the intensity of the interference. If the situation allows, appropriate isolation and
shielding can be done;
Assuming that there are traces with large electromagnetic interference around the module
(high-frequency digital, high-frequency analog, power traces), the performance of the module will
also be greatly affected. It is recommended to stay away from the module according to the intensity
of the interference. Proper isolation and shielding;
If the communication line uses 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 TTL protocols whose physical layer is also 2.4GHz, such as USB3.0;
The antenna installation structure has a great influence on the performance of the module. Make sure
that the antenna is exposed, preferably vertically upward. When the module is installed inside the
casing, a high-quality antenna extension cable can be used to extend the antenna to the outside of
the casing;
The antenna must not be installed inside the metal shell, which will greatly reduce the transmission
distance.
4.2 Software editing
This module is SX1280+PA+LNA, its driving mode is completely equivalent to SX1280, users can operate
according to the SX1280 chip manual;
GDO0 is a general-purpose I/O port, see SX1280 manual;
GDO2 is generally configured as an IRQ-like function, or it can be disconnected. The SPI query method
can be used to obtain the interrupt status, but it is recommended to use the external interrupt of
the microcontroller for connection;
After the SX1280 is restored to IDLE mode or configured in sleep mode, it is recommended to
re-initialize the power configuration table.
It is recommended to set the power output parameter of SX1280 to 0dBm. At this time, the module can
output power of 27dBm. When the output power of SX1280 is increased, the current will increase, and
the power will not increase significantly.

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
8
Chapter 5 Basic Applications
5.1 Basic circuit

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
9
Chapter 6 FAQ
6.1 Communication range is too short
When there is a straight-line communication obstacle, the communication distance will be correspondingly
attenuated;
Temperature, humidity, and co-channel interference will increase the communication packet loss rate;
The ground absorbs and reflects radio waves, and the test effect close to the ground is poor;
Seawater has a strong ability to absorb radio waves, so the seaside test effect is poor;
If there is a metal object near the antenna, or is placed in a metal shell, the signal attenuation will be very
serious;
The power register is set incorrectly, and the air rate is set too high (the higher the air rate, the closer the
distance);
The low voltage of the power supply at room temperature is lower than the recommended value, and the
lower the voltage, the lower the output power;
The antenna used is poorly matched with the module or the quality of the antenna itself is faulty.
6.2 Module is easy to damage
Please check the power supply to ensure that it is between the recommended power supply voltages. If it
exceeds the maximum value, the module will be permanently damaged;
Please check the stability of the power supply, the voltage should not fluctuate greatly and frequently;
Please ensure anti-static operation during installation and use, and high-frequency components are
electrostatically sensitive;
Please ensure that the humidity during installation and use should not be too high, and some components
are humidity-sensitive devices;
If there is no special requirement, it is not recommended to use it at too high or too low temperature.
6.3 Bit error rate is too high
There is co-frequency signal interference nearby, stay away from the interference source or modify
the frequency and channel to avoid interference;
The clock waveform on the SPI is not standard, check whether there is interference on the SPI line,
and the SPI bus line should not be too long;
If the power supply is not ideal, it may also cause garbled characters. Be sure to ensure the
reliability of the power supply;
Poor quality or too long extension lines and feeder lines will also cause a high bit error rate.

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
10
Chapter 7 Welding Operation Guidance
7.1 Reflow temperature
Profile Feature
Curve feature
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Solder paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）
Minimum preheat
temperature
100℃
150℃
Preheat temperature max (Tsmax)
Maximum preheat
temperature
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
Preheat time
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
Average rate of ascent
3℃/second max
3℃/second max
Liquidous Temperature (TL)
Liquidus temperature
183℃
217℃
Time（tL）Maintained Above（TL）
Time above liquidus
60-90 sec
30-90 sec
Peak temperature（Tp）
Peak temperature
220-235℃
230-250℃
Aveage ramp-down rate（Tp to Tsmax）
Average rate of descent
6℃/second max
6℃/second max
Time 25℃ to peak temperature
Time from 25°C to peak
temperature
6 minutes max
8 minutes max

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
11
7.2 Reflow soldering curve
Chapter 8 Related Models
Model
IC
Frequency
Power
Distance
Size
Package
Interface
Hz
dBm
km
mm
E28-2G4T12S
SX1280
2.4G
12.5
3
17.5*28.7
SMD
TTL
E28-2G4M27S
SX1280
2.4G
27
8
15*26.5
SMD
SPI
E28-2G4M20S
SX1280
2.4G
20
6
15*26.5
SMD
SPI
E28-2G4M12S
SX1280
2.4G
12.5
3
25*14
SMD
SPI

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
12
Chapter 9 Antenna Guidelines
9.1 Antenna recommendation
Antennas play an important role in the communication process, and often inferior antennas will have a great
impact on the communication system. Therefore, our company recommends some antennas as antennas with
excellent performance and reasonable price for our wireless modules.
Model
Type
Frequency
Gain
Size
Feeder
Interface
Features
Hz
dBi
mm
cm
TX2400-NP-5010
FPC
2.4G
2.0
10x50
-
IPEX
Flexible FPC Soft Antenna
TX2400-JZ-3
Rubber
2.4G
2.0
30
-
SMA-J
Ultra-short straight,
omnidirectional antenna
TX2400-JZ-5
Rubber
2.4G
2.0
50
-
SMA-J
Ultra-short straight,
omnidirectional antenna
TX2400-JW-5
Rubber
2.4G
2.0
50
-
SMA-J
Fixed bent, omnidirectional
antenna
TX2400-JK-11
Rubber
2.4G
2.5
110
-
SMA-J
Bendable glue stick,
omnidirectional antenna
TX2400-JK-20
Rubber
2.4G
3.0
200
-
SMA-J
Bendable glue stick,
omnidirectional antenna
TX2400-XPL-150
Sucker
2.4G
3.5
150
150
SMA-J
Small suction cup antenna,
cost-effective
Revise History
Version
Revision Date
Revision Notes
Operator
1.0
2021-11-15
Initial Version
Linson

Chengdu Ebyte Electronic Technology Co., Ltd. E28-2G4M27SX
User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
13
About us
Hotline：[phone] Tel：[phone]
Support：[e-mail]
Website：https://www.cdebyte.com
Address：Building B5, No. 199, West District Avenue, High-tech West
District, Chengdu City, Sichuan Province