EBYTE E19-868M20S 100mW SMD Wireless Module User Manual
- June 5, 2024
- ebyte
Table of Contents
EBYTE E19-868M20S 100mW SMD Wireless Module
Overview
Brief introduction
E19-868M20S is a small-sized 868MHz LoRaTM SMD wireless module, based on the original imported RF chip SX1276 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.
Features
- The communication distance tested is up to 5km
- The maximum transmission power of 100mW, software multi-level adjustable；
- Support the global license-free ISM 868MH 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 secondary development and integration.
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
|
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| /
Operating parameter
Main parameter
| Performance|
Remark
---|---|---
Min.| Typ.| Max.
Operating voltage（V）| 1.8| 3.3| 3.6| ≥3.3V 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）| 862| 868| 893| 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|
Communication interface| SPI| 0-10Mbps
Size| 17.6*25.2 mm|
Antenna| Stamp hole| 50 ohm impedance
Size and pin definition
| Pin No | Pin item | Pin direction | Pin application |
|---|---|---|---|
| 1 | GND | Input | Ground electrode, connected to the power reference ground |
| 2 | DIO5 | Input/Output | Configurable IO port（Please find more on SX1278 |
datasheet）
3| DIO4| Input/Output| Configurable IO port（Please find more on SX1278
datasheet）
4| DIO3| Input/Output| Configurable IO port（Please find more on SX1278
datasheet）
5| DIO2| Input/Output| Configurable IO port（Please find more on SX1278
datasheet）
6| DIO1| Input/Output| Configurable IO port（Please find more on SX1278
datasheet）
7| DIO0| Input/Output| Configurable IO port（Please find more on SX1278
datasheet）
8| RST| Input| Reset
9| NC| —| Not connect
10| GND| Input| Ground electrode, connected to the power reference ground
11| VCC| Input| Power supply: 1.8~3.6V (3.3V Ceramic filter capacitor is
advised to add)
12| SCK| Input| SPI clock
13| MISO| Output| SPI clock
14| MOSI| Input| SPI clock
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 TXEN pin is in high level, RXEN pin is in
low level when transmitting
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
Basic operation
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.
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 SX1276 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.
Basic application
Basic circuit diagram
FAQ
The 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 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.
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;
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|
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
Reflow soldering curve
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| 17.625.2| Stamp hole
E19-433M30S| SX1278|
433M| 30| 10| SMD| 2537| Stamp hole
E19-915M20S| SX1276|
915M| 20| 5| SMD| 17.625.2| Stamp hole
E19-433M20SC| SX1278|
433M| 20| 5| SMD| 17.6*25.2| Stamp hole
Antenna guidance
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 reasonable price.
Model No.| Type| Frequency
Hz
| Interface| Gain
dBi
| Height| Cable| Function feature
---|---|---|---|---|---|---|---
TX868-XP-100| Sucker|
868M| SMA-J| 3.5| 29cm| 100cm| Sucker antenna, High gain
TX868-JK-20| Rubber|
868M| SMA-J| 3| 200mm| –| Flexible &omnidirectional
|
Rubber
|
868M
|
SMA-J
|
2
|
50mm
|
–
| Short straight
&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 | 2021/1/22 | Parameter correction | Linson |
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