Ebyte E19 Series Manuale utente

E19-900M20S2 User Manual

SX1276 868/915MHz 100mW SPI SMD RF Module

Chengdu Ebyte Electronic Technology Co., Ltd. E19-900M20S2 User Manual

Contents

Disclaimer...............................................................................................................................................................................3

1 Introduction..........................................................................................................................................................................4

1.1 Brief Introduction..................................................................................................................................................... 4

Features...........................................................................................................................................................................4

1.2 Applications.............................................................................................................................................................. 4

2 Specification and parameter.................................................................................................................................................5

2.1 Limit parameter.........................................................................................................................................................5

2.2 Operating Parameter................................................................................................................................................. 5

3 Size and pin definition......................................................................................................................................................... 7

4 Basic operation.................................................................................................................................................................... 8

4.1 Hardware Design...................................................................................................................................................... 8

4.2 Programming............................................................................................................................................................ 9

5 Programme Diagram............................................................................................................................................................9

5.1 Connection for Programming................................................................................................................................... 9

6 FAQ....................................................................................................................................................................................10

6.1 Communication range is too short.......................................................................................................................... 10

6.2 Module is easy to damage.......................................................................................................................................10

6.3 BER(Bit Error Rate) is high....................................................................................................................................10

7 Soldering Guide................................................................................................................................................................. 11

7.1 Reflow Soldering Temperature............................................................................................................................... 11

7.2 Reflow Soldering Curve......................................................................................................................................... 11

E19 Series Modules.............................................................................................................................................................. 12

9 Antenna Recommendation.................................................................................................................................................12

9.1 Recommendation.................................................................................................................................................... 12

Revision history.................................................................................................................................................................... 13

About us................................................................................................................................................................................13

Chengdu Ebyte Electronic Technology Co., Ltd. E19-900M20S2 User Manual

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. E19-900M20S2 User Manual

1 Introduction

1.1 Brief Introduction

E19-900M20S2 is an ultra-small 915MHz SMD LoRaTM wireless

module independently developed based on the SX1276 produced by Semtech in

the United States. It uses an industrial-grade high-precision 32MHz crystal

oscillator.

Because the original imported SX1276 is the core of the module, its

stability has won unanimous praise from users, and there is no need to worry

about compatibility. Because of its advanced LoRaTM modulation technology,

its anti-jamming performance and communication distance are far beyond the

current FSK and GFSK modulation products. This module is mainly aimed at smart home, wireless meter reading,

scientific research and medical treatment, and medium and long-distance wireless communication equipment. Radio

frequency performance and component selection are in accordance with industrial standards.

Since this module is a pure radio frequency transceiver module, it needs to be driven by MCU or a dedicated SPI

debugging tool.

Features

Ultra-small size, only 15*15mm;

Under ideal conditions, the communication distance can reach 5km;

The maximum transmission power is 100mW, and the software is multi-level adjustable;

Support the global license-free ISM 868/915MHz frequency band;

Support the data transmission rate of 0.018kbps～37.5kbps in LoRaTM mode;

Support data transmission rate up to 300kbps in FSK mode;

Support multiple modulation modes LoRaTM/FSK/GFSK/MSK/GMSK/OOK;

Large FIFO capacity, support 256Byte data buffer;

Support 2.3V~3.6V power supply, power supply greater than 3.3V can guarantee the best performance;

Industrial standard design, supporting long-term use at -40～+85℃;

The stamp hole is convenient for users to develop and integrate.

1.2 Applications

Smart home and industrial sensors, etc.;

Security system, positioning system;

Wireless remote control, UAV;

Wireless game remote control;

Healthcare products;

Wireless voice, wireless headset;

Automotive industry applications.

Chengdu Ebyte Electronic Technology Co., Ltd. E19-900M20S2 User Manual

2 Specification and parameter

2.1 Limit parameter

The main parameters

Value

Remark

Min.

Max.

Power supply voltage (V)

3.6

Over 3.6V will permanently burn the module

Blocking power (dBm)

It is less likely to burn when used at close

range

Working temperature (℃)

-40

+85

Industrial grade

2.2 Operating Parameter

The main parameters

Value

Remark

Min.

Typical

Max.

Working voltage (V)

2.3

3.3

3.6

≥3.3V can guarantee output power

Communication level (V)

3.3

Using 5V TTL is risky to burn

Working temperature (℃)

-40

+85

Industrial design

Working frequency (MHz)

862

915

931

Support ISM frequency band

Power

Consumptio

Emission current (mA)

135

Instantaneo

us power

consumptio

Instantaneous power consumption

Receiving current (mA)

12.6

Sleep current (μA)

2.0

Software shutdown

Max TX power（dBm）

18.5

Receiving sensitivity（dBm）

-145

-147

-148

The sensitivity test condition is airspeed

0.3kbps,

Coding rate 4/5, spreading factor 12

Air data rate

（bps）

LoRa（bps）

0.018

37.5

User programmable customization

GFSK（bps）

1.2

300

User programmable customization

Chengdu Ebyte Electronic Technology Co., Ltd. E19-900M20S2 User Manual

The main parameters

Value

Remark

Reference distance

5000m

Clear and open, antenna gain 5dBi, antenna height 2.5 meters,

air rate 1kbps

FIFO

256Byte

Maximum length of single transmission

Crystal frequency

32MHz

Modulation

LoRa

(recommended)

FSK, GFSK, MSK, GMSK, LoRa TM, OOKTM

Packaging method

SMD

Interface method

1.27mm

Communication Interface

SPI

0～10Mbps

Dimensions

15*15mm

Antenna interface

Stamp hole

Equivalent impedance is about 50Ω

Chengdu Ebyte Electronic Technology Co., Ltd. E19-900M20S2 User Manual

3 Size and pin definition

Pin No.

Item

Direction

Description

GND

Ground wire, connected to the power reference ground

GND

Ground wire, connected to the power reference ground

GND

Ground wire, connected to the power reference ground

GND

Ground wire, connected to the power reference ground

DIO0

Input/Output

Configurable general IO port (see SX1276 manual for details)

DIO1

Input/Output

Configurable general IO port (see SX1276 manual for details)

DIO2

Input/Output

Configurable general IO port (see SX1276 manual for details)

DIO3

Input/Output

Configurable general IO port (see SX1276 manual for details)

Internal use of the module (this pin cannot be connected to any electrical network in the circuit design)

DIO5

Input/Output

Configurable general IO port (see SX1276 manual for details)

GND

Ground wire, connected to the power reference ground

GND

Ground wire, connected to the power reference ground

VCC

Power supply, range 2.3～3.6V (recommended 3.3V, recommended to add ceramic filter capacitor)

SCK

Input

SPI clock input pin

MISO

Output

SPI data output pin

MOSI

Input

SPI data input pin

NSS

Input

Module chip select pin, used to start a SPI communication, active low

RST

Input

Chip reset trigger input pin, active low

GND

Ground wire, connected to the power reference ground

GND

Ground wire, connected to the power reference ground

ANT

antenna

GND

Ground wire, connected to the power reference ground

Chengdu Ebyte Electronic Technology Co., Ltd. E19-900M20S2 User Manual

4 Basic operation

4.1 Hardware Design

It is recommended to use a DC stabilized power supply to supply power to the module. The power ripple coefficient

should be as small as possible, and the module must 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 it is within the recommended power supply voltage. If it exceeds the

maximum value, it will cause permanent damage to the module;

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, and the whole machine is conducive to long-term stable operation;

The module should be as far away as possible from power supply, transformer, high frequency wiring and other

parts with large electromagnetic interference;

High-frequency digital wiring, high-frequency analog wiring, and power wiring must avoid the bottom of the

module. If it is necessary to pass under the module, assume that the module is soldered to the Top Layer, and the top

layer of the contact part of the module is covered with copper (all copper And well grounded), it must be close to

the digital part of the module and routed in the Bottom Layer;

Assuming that the module is soldered or placed on the Top Layer, it is also wrong to randomly route the 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 components with large electromagnetic interference around the module, it will greatly

affect the performance of the module. According to the intensity of the interference, it is recommended to stay away

from the module. If the situation permits, proper isolation and shielding can be done;

Assuming that there are large electromagnetic interference traces (high-frequency digital, high-frequency analog,

power traces) around the module, it will greatly affect the performance of the module. According to the intensity of

the interference, it is recommended to stay away from the module. 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 part of the physical layer that is also 2.4GHz TTL protocol, such as USB3.0;

The antenna installation structure has a great impact on the performance of the module. Make sure that the antenna

is exposed, preferably vertically upward. When the module is installed inside the case, a high-quality antenna

extension cable can be used to extend the antenna to the outside of the case;

The antenna must not be installed inside the metal shell, which will greatly reduce the transmission distance.

Chengdu Ebyte Electronic Technology Co., Ltd. E19-900M20S2 User Manual

4.2 Programming

DIO0, DIO1, DIO2, DIO3, and DIO5 are general-purpose I/O ports, which can be configured into multiple

functions. Refer to the SX1276 manual for details.

When the module is sending, the DIO4 pin of SX1276 is set low, when the module is receiving, the DIO4 pin of

SX1276 is set high, which requires the customer to write software to control

The SPI communication rate should not be set too high, usually 1Mbps is recommended;

The register configuration can be reinitialized when the chip is idle for higher stability.

5 Programme Diagram

5.1 Connection for Programming

Chengdu Ebyte Electronic Technology Co., Ltd. E19-900M20S2 User Manual

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.

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