Ebyte E49-900M20S User manual

成都亿佰特电子科技有限公司 E49-900M20S 产品规格书
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
E49-900M20S User manual
868MHz/915MHz SMD wireless modules

成都亿佰特电子科技有限公司 E49-900M20S 产品规格书
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
1
Contents
Disclaimer....................................................................................................................................................................... 2
Chapter 1 Introduction.................................................................................................................................................... 3
1.1 Brief introduction..............................................................................................................................................3
1.2 Features.............................................................................................................................................................3
1.3 Application........................................................................................................................................................3
Chapter 2 Specification and parameters............................................................................................................ 4
2.1 Limit parameter.................................................................................................................................................4
2.2 Operating parameter......................................................................................................................................... 4
Chapter 3 Size and pin definition................................................................................................................................... 5
Chapter 4 Basic operation...............................................................................................................................................6
4.1 Hardware design............................................................................................................................................... 6
4.2 Programming.................................................................................................................................................... 6
Chapter 5 Basic application............................................................................................................................................ 7
5.1 Basic circuit...................................................................................................................................................... 7
6 FAQ..............................................................................................................................................................................8
6.1 Communication range is too short....................................................................................................................8
6.2 Module is easy to damage................................................................................................................................ 8
6.3 BER(Bit Error Rate) is high............................................................................................................................. 8
7 Welding instruction................................................................................................................................................... 9
7.1 Reflow soldering temperature.......................................................................................................................... 9
7.2 Reflow soldering curve.....................................................................................................................................9
8 Related products........................................................................................................................................................ 10
9 Antenna guide............................................................................................................................................................ 10
9.1 Antenna recommendation............................................................................................................................... 10
Revision history............................................................................................................................................................ 11
About us........................................................................................................................................................................ 11

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
2
Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
3
Chapter 1 Introduction
1.1 Brief introduction
E49-900M20S is a cost-effective wireless data transmission
module launched by Chengdu Ebyte. It is A pure hardware module based
on CMT2300A.
E49-900M20S Supports the maximum transmission power of
20dBm, users can set a lower output power , thus saving power
consumption.The module works in the 850MHz ~ 930MHz frequency
band, including the commonly used 868MHz and 915MHz frequency
band.
Since this module is a pure RF transceiver module, using SPI
interface, needs MCU driver.
1.2 Features
The measured communication distance can reach 2.5km；
Maximum transmission power of 20dBm，software multi-level adjustable；
Supports ISM 868MHz/915MHz band；
Supports 0.5Kbps～300Kbps transmission rate；
Supports low power mode, suitable for battery；
Supports GFSK modulation mode, OOK & (G)MSK；
Supports 2.6V～3.6V power supply；
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.
1.3 Application
Smart home and industrial sensors;
Security, positioning system;
Wireless remote control, UAV;
Wireless game remote control;
Healthcare products;
Wireless voice, wireless headset;
Car industry.

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
4
Chapter 2 Specification and parameters
2.1 Limit parameter
Chart 2-1 limit paremeters
Main parameters
Performance
Remark
Min
Max
Power supply（V）
0
3.6
Voltage over 3.6V will cause permanent
damage to module
Operating temperature（℃）
-40
+85
Industrial-grade
2.2 Operating parameter
Chart 2-2 Operating parameters
Main parameters
Performance
Remark
Min
Type
Max
Power supply（V）
1.8
3.3
3.6
Voltage over 3.6V will cause permanent
damage to module
Communication level（V）
-
3.3
-
For 5V TTL, it may be at risk of burning
down
Operating temperature（℃）
-40
-
+85
Industrial grade
Operating frequency（MHz）
850
868
930
-
Power
Consump
- tion
TX current（mA）
-
75
-
@TX power 20dBm
RX current（mA）
-
8.5
-
-
Sleep current（nA）
300
300
800
-
Max TX power（dBm）
-
20
-
-
Receiving sensitivity（dBm）
-116
-117
-118
@Air data rate is 1.2kbps
Main parameters
Description
Remark
Reference distance
3km
Test condition：clear and open area, antenna height: 2.5m，air
data rate 2.4kbps
Crystal Oscillator
26MHz
-
Package
SMT
-
Communication interface
SPI
-
Size
20*14mm
-
Antenna
IPEX/stamp
hole
50 ohm impedance
Weight
1.2±0.1g
-

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
5
Chapter 3 Size and pin definition
figure 3-1 Size and pin definition
Chart 3-1 pin definition
Pin No.
Item
Direction
Description
1
GND
-
Ground
2
GND
-
Ground
3
GND
-
Ground
4
GND
-
Ground
5
GPIO1
DI/O
Configurable multi-function IO port（see CMT2300A manual for details）
6
GPIO2
DI/O
Configurable multi-function IO port（see CMT2300A manual for details）
7
GPIO3
DI/O
Configurable multi-function IO port（see CMT2300A manual for details）
8
VCC
-
Power supply +3.3V
9
GND
-
Ground
10
GND
-
Ground
11
SCLK
DI
SPI clock pin
12
SDIO
DI/O
SPI data pin
13
CSB
DI
SPI register accesser
14
FCSB
DI
SPI FIFO accesser
15
GND
-
Ground
16
GND
-
Ground
17
ANT
-
RF module stamp hole interface，impedance 50Ω
18
GND
-
Ground

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
6
Chapter 4 Basic operation
4.1 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 that between the recommended supply voltage, if exceeding the
maximum, the module will be permanently damaged;
Please check the stability of the power supply. Voltage can 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 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;
Bottom Layer 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;
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.
4.2 Programming
The core of this module is CMT2300A，its driving method is SPI，the user can operate according to the
CMT2300A chip manual；
GPIO1/GPIO2/GPIO3 are general IO port, see CMT2300A manual for details；

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
7
Chapter 5 Basic application
5.1 Basic circuit
Figure 5-1 circuit

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
8
6 FAQ
6.1 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.
6.2 Module is easy to damage
Please check the power supply source, ensure it is between recommends, voltage higher than the maximum will
damage the module;
Please check the stability of power source, the voltage cannot fluctuate too much;
Please make sure anti-static 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.
6.3 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;
SPI clock waveform is not standard, check whether there is interference on the SPI line, SPI bus wiring should not
be too long;
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.

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
9
7 Welding instruction
7.1 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℃
Time（tL）Maintained Above（TL）
60-90 sec
30-90 sec
Peak temperature（Tp）
220-235℃
230-250℃
Aveage ramp-down rate（Tp to Tsmax）
6℃/second max
6℃/second max
Time 25℃ to peak temperature
6 minutes max
8 minutes max
7.2 Reflow soldering curve

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
10
8 Related products
Product No.
Chip
Frequency
Tx power
Distance
Size
Package
Interface
Hz
dBm
km
mm
E49-400M20S
CMT2300A
410~510MHz
20
2.5
20*14
SMT
SPI
E49-400M20S4
CMT2300A
410~510MHz
20
2.5
16*16
SMT
SPI
E49-400M30S
CMT2300A
410~510MHz
30
5.5
24*38.5
SMT
SPI
9 Antenna guide
9.1 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
Gain
Size
Cable
Interface
Function feature
Hz
dBi
mm
cm
TX868-JZLW-15
Rubber
antenna
868M
3
165
-
IPEX-1
Rubber
antenna,Omni-directional
antenna
TX915-JZLW-15
Rubber
antenna
915M
3
165
-
IPEX-1
Rubber
antenna,Omni-directional
antenna
TX915-FPC-4510
flexible
antenna
915M
2
130
-
IPEX
flexible antenna

Chengdu Ebyte Electronic Technology Co.,Ltd. E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
11
Revision history
Version
Date
Description
Issued by
1.0
2021-5-31
Initial version
Linson
About us
Technical support: suppo[email protected]
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