Ebyte E19-868M20S User Manual

E19-868M20S User Manual

SX1276 868MHz 100mW SMD Wireless Module

Chengdu Ebyte Electronic Technology Co., Ltd. E19-868M20S User Manu al

1. Overview................................................................................................................................................................................................2

1.1 Brief introduction ......................................................................................................................................................................2

1.2 Features .......................................................................................................................................................................................2

1.3 Application .................................................................................................................................................................................2

2.Spec ification and parameter ................................................................................................................................................................3

2.1 Limit parameter .........................................................................................................................................................................3

2.2 Operating para meter .................................................................................................................................................................3

3.Size and pin definition ..........................................................................................................................................................................4

4. Basic operation .....................................................................................................................................................................................5

4.1 Hardware design ................................................................................................................................................................5

4.2 Software ed iting ........................................................................................................................................................................6

5.Basic application .........................................................................................................................................................................6

5.1 Basic circuit diagram ................................................................................................................................................................6

6.FA Q..........................................................................................................................................................................................................7

6.1 Communication range is too short .........................................................................................................................................7

6.2 Module is easy to damage........................................................................................................................................................7

6.3 BER(Bit Error Rate) is high ....................................................................................................................................................7

7.Production guidance..............................................................................................................................................................................7

7.1 Reflow soldering te mperature .................................................................................................................................................7

7.2 Reflow soldering curve ............................................................................................................................................................8

8. E19 Ser ies ..............................................................................................................................................................................................9

9. Antenna guidance .................................................................................................................................................................................9

9.1 Antenna recommendation ........................................................................................................................................................9

Revision history ..................................................................................................................................................................................... 10

About us .................................................................................................................................................................................................. 10

Chengdu Ebyte Electronic Technology Co., Ltd. E19-868M20S User Manu al

1. Overview

1.1 Brief introduction

E19-868M20S is a s mall-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 us ers.

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 , us ers 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 transmiss ion 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 trans miss ion 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 bes t performance；  Industrial grade standard design, support -40 ~ 85 °C for working over a long time；  Stamp hole, good for s econdary development and integration.

1.3 Application

 Home security alarm and remote keyless entry；  Smart home and industrial sens ors；  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. E19-868M20S User Manu al

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

≥3.3V 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）

-

630

-

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

Lora

TM

Main parameter

Description

Remark

Distance for reference

5000m

Test condition：clear and open area, antenna gain: 5dBi，antenna height : 2.5m，air data rate: 0.3kbp s

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

Chengdu Ebyte Electronic Technology Co., Ltd. E19-868M20S User Manu al

3.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 sup p ly: 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

Chengdu Ebyte Electronic Technology Co., Ltd. E19-868M20S User Manu al

16

TXEN

Input

Radio frequency switch control, make sure the TXEN pin is in high level, RXEN p in is in low level when transmitting.

17

RXEN

Input

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

4. Basic operation

4.1 Hardware design

 It is recommended to use a DC stabilized power supply. The power s upply ripple factor is as small as possible, and

the module needs to be reliably grounded.；

 Please pay attention to the correct connection of the pos itive 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

maximu m 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 s upply circuit for the module, it is often recommended to reserve more than 30% of the

margin, s o the whole machine is beneficial for long -term s table operation.；

 The module should be as far away as possible from the power supply, trans formers, 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 neces s ary 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；

 As suming 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 s purs and receiving sens itivity 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；

 As sume 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 s tay

away from the module according to the strength of the interference.If necessary, appropriate isolation and shielding

can be done.

 If the communication line us es a 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is

still a risk of damage)；

 Try to s tay away from some phys ical layers such as TTL protocol at 2.4GHz , for example: USB3.0；

Chengdu Ebyte Electronic Technology Co., Ltd. E19-868M20S User Manu al

 The mounting structure of antenna has a great influence on the performance of the module. It is necessary to ens ure

that the antenna is exposed, preferably vertically upward. When the module is mounted inside the cas e, us e a good

antenna extension cable to extend the antenna to the outside；

 The antenna must not be installed ins ide the metal case, which will caus e the transmission distance to be greatly

weakened.

4.2 Software editing

 SX1278/SX1276+PA+LNA，s ame drive way as SX1278/SX1276，us er can refer to SX1278/SX1276 datas heet.  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 us ed.

 RST、TXEN、RXEN must be connected,among which RST control chip reset，TXEN, RXEN are for controlling

RF s witch.

 Make it ground well with large space for grounding and small power ripple. Filter capacitor is necess ary and make

sure it is clos e to pin VCC and GND.

 SPI communication rate should not be set too high, usually around 1Mbps.  In trans mitting，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, s et 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. E19-868M20S User Manu al

6.FAQ

6.1 Communication range is too short

 The communication distance will be affected when obs tacle exists.  Data lose rate will be affected by temperature, humidity and co-channel interference.  The ground will abs orb and reflect wireless radio wave, s o the performance will be poor when tes ting near groun d.  Sea water has great ability in abs orbing wireless radio wave, so performance will be poor when tes ting 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 s upply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the

trans mitting 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 s ource, the voltage cannot fluctuate too much.  Please make sure antistatic measure are taken when installing and us ing, high frequency devices have electrostatic

susceptibility.

 Please ensure the humidity is within limited range, some parts are sensitive to humidity.  Please avoid us ing modules under too high or too low temperature.

6.3 BER(Bit Error Rate) is high

 There are co-channel signal interference nearby, pleas e be away from interference sources or modify frequency and

channel to avoid interference;

 Poor power supply may caus e 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. E19-868M20S User Manu al

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

Average ramp-up rate(Tsmax to Tp)

Average ramp-up rate

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

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. E19-868M20S User Manu al

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 s ystem. 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

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

TX868-JZ-5

Rubber

868M

SMA-J

2

50mm

-

Short straight &omnidirectional

Chengdu Ebyte Electronic Technology Co., Ltd. E19-868M20S User Manu al

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

About us

Technical support: s upport@cdebyte.com Documents and RF Setting download link: www.ebyte.com Thank you for us ing Ebyte products ! Please contact us with any questions or suggestions: info@cdebyte.com

------------------- -- -- --- -- -- -- --- ----------------------------- -- -- --- -- -- --- -- ----------------Fax: 028-64146160 ext. 821 Web: www.ebyte.com Address: Innovation Center D347, 4# XI-XIN Road,Chengdu, Sichuan, China

Ebyte E19-868M20S User Manual

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Frequently Asked Questions

User Manual