Ebyte E19-915M20S User manual

E19-915M20S User Manual
SX1276 915MHz 100mW SMD Wireless Module

Chengdu Ebyte Electronic Technology Co., Ltd. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 1-1
1. Overview
1.1 Brief introduction
E19-915M20S is a small-sized 915MHz LoRaTM SMD wireless module,based on the original imported RF chip
SX1278 from SEMTECH.
Due to the use of the imported SX1276 as the core of the module, with its
stable and reliable characteristics, it is favored by the majority of users.
Compared with the FSK、GFSK products, it has made great progress in receiving
current, receiving sensitivity, transmitting power, receiving rate range and
anti-interference ability. The module is aimed at smart home, wireless meter
reading, scientific research and medical, and medium and long distance wireless
communication equipment. Since RF performance and component selection are
in accordance with industrial standards, and the product has obtained FCC, CE,
RoHS and other international authoritative certification reports, users do not need to worry about its performance. High
precision 32MHz crystal is used.
Since the module is a pure RF transceiver module, you need to use the MCU driver or a dedicated SPI debug tool.
1.2 Features
Communication distance tested is up to 5km；
Maximum transmission power of 100mW, software multi-level adjustable；
Support the global license-free ISM 915MHz band；
Support air date rate of 0.018kbps~37.5kbp in LoRaTM；
The maximum data transmission rate 300kpbs in FSK mode；
Support multiple modulation methods, LoRaTM/FSK/GFSK/MSK/GMSK/OOK；
Large capacity FIFO, supports 256Byte data buffer；
Support 2.5V~3.6V power supply, power supply over 3.3V can guarantee the best performance；
Industrial grade standard design, support -40 ~ 85 °C for working over a long time；
Stamp hole, good for secndary development and integration.
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.

Chengdu Ebyte Electronic Technology Co., Ltd. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 1-2
2.Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remark
Min.
Max.
Power supply（V）
0
3.6
Voltage over 3.6V 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）
1.8
3.3
3.6
≥3.3 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）
900
915
931
Support ISM band
Power
consumpti
on
TX current（mA）
110
Instant power consumption
RX current（mA）
14
Sleep current （μA）
1.0
Software is shut down
Max Tx power（dBm）
19
20
21
Receiving sensitivity（dBm）
-145
-147
-148
Sensitivity test conditions：
air data rate: 0.3 kbps, Coding rate 4/5,
Spread Spectrum Factor 12.
Air data rate（bps）
1.2
-
300
Kbps
FSK
0.018
-
37.5
Kbps
LoraTM
Main parameter
Description
Remark
Distance for reference
5000m
Test condition：clear and open area, antenna gain: 5dBi，
antenna height: 2.5m，air data rate: 0.3kbps
FIFO
256Byte
Max length transmitted each time
Crystal frequency
32MHz
Modulation
LoRaTM (recommended)
FSK/GFSK/MSK/GMSK/OOK
Package
SMD
Connector
1.27mm
Stamp hole
Communication interface
SPI
0-10Mbps
Size
17.6*25.2 mm
Antenna
Stamp hole
50 ohm impedance

Chengdu Ebyte Electronic Technology Co., Ltd. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 1-3
3.Size and pin definition
Pin No.
Name
Direction
Usage
1
GND
Input
Ground electrode, connected to the power reference ground.
2
DIO5
Input /Output
Configurable IO interface(See more details in SX1278 data sheet
3
DIO4
Input /Output
Configurable IO interface(See more details in SX1278 data sheet
4
DIO3
Input /Output
Configurable IO interface(See more details in SX1278 data sheet
5
DIO2
Input /Output
Configurable IO interface(See more details in SX1278 data sheet
6
DIO1
Input /Output
Configurable IO interface(See more details in SX1278 data sheet
7
DIO0
Input /Output
Configurable IO interface(See more details in SX1278 data sheet
8
RST
Input
Reset
9
NC
--
Not connect
10
GND
Input
Ground electrode, connected to the power reference ground.
11
VCC
Input
Power supply 1.8V-3.6V DC. 3.3V and external ceramic filter
capacitor are recommended.）
12
SCK
Input
SPI clock
13
MISO
Output
Master input slave output
14
MOSI
Input
Master output slave input
15
NSS
Input
Chip select
16
TXEN
Input
Radio frequency switch control, make sure the TXEN pin is in
high level, RXEN pin is in low level when transmitting.
17
RXEN
Input
Radio frequency switch control, Make sure the RXEN pin is in
high level ,TXEN pin is in low level when receiving.
18
GND
Ground electrode, connected to the power reference ground.
19
GND
Ground electrode, connected to the power reference ground.
20
ANT
Output
Antenna
21
GND
Ground electrode, connected to the power reference ground.

Chengdu Ebyte Electronic Technology Co., Ltd. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 4-4
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 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. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 4-5
4.2 Software editing
SX1278/SX1276+PA+LNA，same drive way as SX1278/SX1276，user can refer to SX1278/SX1276 datasheet.
DIO0、DIO1、DIO2、DIO3、DIO4、DIO5 are configurable I/O ports for various application，see more in SX12786
datasheet. It can be floated when not used.
RST、TXEN、RXEN must be connected,among which RST control chip reset，TXEN, RXEN are for controlling RF
switch.
Make it ground well with large space for grounding and small power ripple. Filter capacitor is necessary and make
sure it is close to pin VCC and GND.
SPI communication rate should not be set too high, usually around 1Mbps.
In transmitting，set TXEN as high communication level，RXEN pin is low level; In receiving, set RXEN as high
communication level,TXEN is low level; Before powering off, set TXEN、RXEN as low level.
Re-initialize register configuration when the chip is idle for higher stability.
5.Basic application
5.1 Basic circuit diagram

Chengdu Ebyte Electronic Technology Co., Ltd. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 4-6
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 2.0V~3.6V, voltage higher than 3.6V will damage the module.
Please check the stability of power source, the voltage cannot fluctuate too much.
Please make sure antistatic measure are taken when installing and using, high frequency devices have electrostatic
susceptibility.
Please ensure the humidity is within limited range, some parts are sensitive to humidity.
Please avoid using modules under too high or too low temperature.
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;
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;
7 Production guidance
7.1 Reflow soldering temperature

Chengdu Ebyte Electronic Technology Co., Ltd. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 4-7
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
3℃/second max
Liquidous Temperature (TL)
Liquid phase temp.
183℃
217℃
Time（tL）Maintained Above（TL）
Time below liquid phase line
60-90 sec
30-90 sec
Peak temperature（Tp）
Peak temp.
220-235℃
230-250℃
Aveage ramp-down rate（Tp to Tsmax）
Aveage ramp-down rate
6℃/second max
6℃/second max
Time 25℃ to peak temperature
Time to peak temperature for
25℃
max 6 minutes
max 8 minutes
7.2 Reflow soldering curve

Chengdu Ebyte Electronic Technology Co., Ltd. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 4-8
8.E19 Series
Model No.
IC
Frequency(Hz)
Tx power
(dBm)
Test distance
km
Package
Antenna
Model No.
E19-433M20S2
SX1278
433M
20
5
SMD
15 * 15
Stamp hole
E19-915M30S
SX1276
915M
30
10
SMD
25 * 40
Stamp hole /IPEX
E19-868M30S
SX1276
868M
30
10
SMD
25 * 40
Stamp hole /IPEX
E19-868M20S
SX1276
868M
20
5
SMD
17.6*25.2
Stamp hole
E19-433M30S
SX1278
433M
30
10
SMD
25*37
Stamp hole
E19-915M20S
SX1276
915M
20
5
SMD
17.6*25.2
Stamp hole
E19-433M20SC
SX1278
433M
20
5
SMD
17.6*25.2
Stamp hole
9 Antenna guidance
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
Hz
Interface
Gain
dBi
Height
Cable
Function feature
TX915-XP-100
Sucker
915M
SMA-J
3.5
25cm
100cm
Sucker antenna, High gain
TX915-JK-20
Rubber
915M
SMA-J
3
210mm
-
Flexible &omnidirectiona
TX915-JK-11
Rubber
915M
SMA-J
2.5
110mm
-
Flexible &omnidirectiona
TX915-JZ-5
Rubber
915M
SMA-J
2
50mm
-
Flexible &omnidirectional
Revision history
Version
Date
Description
Issued by
1.00
2017/10/16
Initial version
huaa
1.10
2018/5/23
Content updated
huaa
1.20
2018/9/21
Model No. split
Huaa
1.30
2019/8/15
Content updated
Lyl

Chengdu Ebyte Electronic Technology Co., Ltd. E19-915M20S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd. 4-9
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