EBYTE E19-915M30S SX1276 915MHz 1W SMD Wireless Module User Manual

EBYTE E19-915M30S SX1276 915MHz 1W SMD Wireless Module

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Overview

Brief introduction

Due to the use of the imported SX1276 as the core of the module, with PA and LNA its sensitivity and stability are largely improved when tx power is 1W. Compared with the FSK、GFSK products, it has made great progress in anti- interference ability and communication distance. The module is aimed at smart homes, wireless meter reading, scientific research and medicine, 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

• Communication distance tested is up to 10km；
• The maximum transmission power of 1W, 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~5.5V power supply, power supply over 5.0V can guarantee the best performance；
• Industrial grade standard design, support -40 ~ 85 °C for working over a long time；
• IPEX and Stamp hole, are 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

|

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| /

Operating parameter

Main parameter

| Performance|

Remark

---|---|---
Min.| Typ.| Max.
Operating voltage（V）| 3.3| 5.0| 5.5| ≥5.0 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）|  | 630|  | Instant power consumption
RX current（mA）|  | 23|  |
Sleep current （μA）|  | 3.0|  | Software is shut down
Max Tx power（dBm）| 28.5| 30| 30|

Receiving sensitivity（dBm）

|

-146

|

-148

|

-150

| 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

|

10000m

| 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| 25.0*40.0 mm|
Antenna| Stamp hole/IPX| 50 ohm impedance

Size and pin definition

datasheet）
3| DIO4| Input/Output| Configurable IO port（Please find more on SX1276 datasheet）
4| DIO3| Input/Output| Configurable IO port（Please find more on SX1276 datasheet）
5| DIO2| Input/Output| Configurable IO port（Please find more on SX1276 datasheet）
6| DIO1| Input/Output| Configurable IO port（Please find more on SX1276 datasheet）
7| DIO0| Input/Output| Configurable IO port（Please find more on SX1276 datasheet）
8| RST| Input| Reset
9| GND| –| Ground electrode, connected to the power reference ground.
10| GND| –| Ground electrode, connected to the power reference ground.
11| VCC| –| Power supply: 4.75~5.5V (Ceramic filter capacitoris 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 pinis in high level, RXEN pin is

in low level when transmitting.

17

| ****

RXEN

| ****

Input

| Radio frequency switch control, make sure the TXEN pinis in high level, RXEN pin is

in low level when transmitting

18| GND| –| Ground electrode, connected to the power reference ground
19| ANT| –| Antenna
20| GND| –| Ground electrode, connected to the power reference ground
21| GND| –| Ground electrode, connected to the power reference ground
22| 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. The 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 fluctuate 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 the 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 driveway as SX1278/SX1276， user can refer to SX1278/SX1276 datasheet.
• DIO0、DIO1、DIO2、DIO3、DIO4、DIO5 are configurable I/O ports for various applications， 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. A filter capacitor is necessary and makes 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 an obstacle exists.
• Data lose rate will be affected by temperature, humidity, and co-channel interference.
• The ground will absorb and reflect wireless radio waves, so the performance will be poor when testing near the ground.
• Seawater has a great ability in absorbing wireless radio waves, so performance will be poor when testing near the sea.
• The signal will be affected when the antenna is near a metal object or put in a metal case.
• The power register was set incorrectly, the 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.

The 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 the power source, the voltage cannot fluctuate too much.
• Please make sure antistatic measures are taken when installing and using, high-frequency devices have electrostatic susceptibility.
• Please ensure the humidity is within a limited range, some parts are sensitive to humidity.
• Please avoid using modules under too high or too low temperatures.

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;
• The 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

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
---|---|---|---|---|---|---|---
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

Antenna selection

• Stamp hole（default）
• IPEX

Package for batch order

Revision history

About us Website: www.ebyte.com Sales: info@cdebyte.com Support: support@cdebyte.com Tel: +86-28-61399028 Ext. 812 Fax: +86-28-64146160 Address: Innovation Center B333~D347, 4# XI-XIN road, High-tech district (west), Chengdu, Sichuan, China

References

• 串口服务器_数传电台_4G DTU_遥控开关_LoRa/ZigBee/WiFi/蓝牙模块-成都亿佰特电子科技有限公司官网

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