Ebyte Lora sx-1276 1w User manual

User Manual

General introduction

LoRa SX-1276 1W module is a small-sized Sub 1GHz LoRaTM SMD wireless module designed by Chengdu Ebyte, based on the original

imported RF chip SX1278/SX1276 from SEMTECH, supporting LoRa Spread spectrum technology, which brings longer transmission

distance and has the advantages of concentrated power density and strong anti-interference.

The 30dBm module with PA(power amplifier) and low-noise amplifier enhanced the communication stability and communication

distance; The 20dBm module integrated the industrial crystal oscillator, accuracy is less than 10ppm, with stable batch production, and

widely used for utilities, IOT transformation and smart home,

The related RF parameters can get through the domestic and overseas certification, such as FCC, CE, RoHs etc., satisfying export

demand.

Model No.

RF IC

Operating

Frequency

Transmitting Power

Communication

distance

Packaging

Antenna type

MHz

dBm

LoRa SX-1276

1W module

SX1276

902~928

10.0

SMD

Stamp hole

/IPEX

LoRa SX-1276 1W module series module is a hardware platform. Without any program, users need to conduct the secondary

development.

SX127X RF Module                                                                                                                                                                                        User Manual of E19 Series Modules 
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co.,Ltd 

 
Contents 
GENERAL INTRODUCTION................................................................................................................................................................ 1 
TECHNICAL PARAMETERS ...................................................................................................................................................... 3 
1 GENERAL PARAMETERS.........................................................................................................................................................................................3 
2 ELECTRICAL PARAMETERS .....................................................................................................................................................................................3 
2.1 Transmitting current ................................................................................................................................................................................3
 
2.2 Receiving current......................................................................................................................................................................................3
 
2.3 Turn-off current........................................................................................................................................................................................3
 
2.4 Supply voltage...........................................................................................................................................................................................3
 
2.5 Communication level...............................................................................................................................................................................4
 
3 RF PARAMETERS ...................................................................................................................................................................................................4 
3.1 Transmitting Power..................................................................................................................................................................................4
 
3.2 Receiving sensitivity.................................................................................................................................................................................4
 
3.3 Recommended Frequency.....................................................................................................................................................................4
 
4 TESTED DISTANCE .................................................................................................................................................................................................5 
PIN DEFINITION................................................................................................................................................................................. 5 
USAGE ..................................................................................................................................................................................................... 6 
REMARK .......................................................................................................................................................................................... 6 
PRODUCTION GUIDANCE .............................................................................................................................................................. 7 
1 REFLOW TEMPERATURE........................................................................................................................................................................................7 
2 REFLOW GRAPH....................................................................................................................................................................................................7 
FAQ.......................................................................................................................................................................................................... 7 
1 THE COMMUNICATION DISTANCE IS TOO CLOSE ................................................................................................................................................7 
2 THE MODULE CAN BE DAMAGED EASILY ..............................................................................................................................................................8 
IMPORTANT STATEMENT .............................................................................................................................................................. 8 
ABOUT US .............................................................................................................................................................................................. 9

1. Technical parameters

1.1 General parameters

Model No.

Size

Net WT

Operating temp.

Operating humidity

Storage temp.

LoRa SX-1276

1W module

SX1276

25.0*40.0 mm

5.2±0.1g

-40 ~ 85℃

10% ~ 90%

-40 ~ 125°C

1.2 Electrical parameters

1.2.1 Transmitting current

Model No.

Min

Typ

Max

Unit

Remark

LoRa SX-1276 1W

module

570.4

620.0

682.0

● When designing current supply circuit, 30% margin is

recommended to be remained so as to ensure long-term

stable operation of the whole module;

● The current at the instant of transmitting may be high,

but the total energy consumed may be lower due to very

short transmitting time;

● When using external antenna, the impedance matching

degree at different frequency points between antenna

and module may affect the transmitting current value at

different levels.

1.2.2 Receiving current

Model No.

Min

Typ

Max

Unit

Remark

LoRa SX-1276 1W

module

21.2

23.0

25.3

● The current consumed when the RF chip is only working

at receiving mode is called as receiving current，the

tested receiving current may be higher for some RF chips

with communication protocol or the developers have

loaded their own protocol to the whole module.

● The current at pure receiving mode will be mA level, the

users have to realize µA level receiving current through

firmware development.

1.2.3 Turn-off current

Model No.

Min

Typ

Max

Unit

Remark

LoRa SX-1276 1W

module

1.5

3.0

4.5

µA

●The turn-off current means the current consumed when

CPU, RAM, Clock and some registers remain operating while

SoC is at very low power consumption status.

●The turn-off current is always lower than the current

consumed when the power supply source of the whole

module is at no-load status.

1.2.4 Supply voltage

Model No.

Min

Typ

Max

Unit

Remark

SX127X RF Module User Manual of E19 Series Modules

LoRa SX-1276 1W

module

3.3

3.5

5.5

V DC

●If the voltage is at maximum value for long time, the

module may be damaged;

● The power supply pin has certain surge-resistance ability,

but the potential pulse higher than the maximum power

supply voltage;

● The power supply voltage is recommended to be higher

than 3.0V, if the voltage is lower than 3.0V, the RF

parameters will be affected at different degrees.

1.2.5 Communication level

Model No.

Min

Typ

Max

Unit

Remark

LoRa SX-1276 1W

module

1.8

3.3

3.6

V DC

●If the communication level is higher than the allowed

maximum value, the module may be damaged;

●Although the communication level can be switched with

various methods, the power consumption of the whole

module will be affected at great degree.

1.3 RF parameters

1.3.1 Transmitting Power

Model No.

Min

Typ

Max

Unit

Remark

LoRa SX-1276 1W

module

29.6

30.0

30.5

dBm

●Due to the error of the materials, each LRC component

has ±0.1% error, so error accumulation will occur since

multiple LRC components are used in the whole RF circuit,

and the transmitting currents will be different at different

modules;

●The power consumption can be lowered by lowering

the transmitting power, but the efficiency of the internal PA

will be decreased by lowering transmitting power due to

various reasons;

●The transmitting power will be lowered by lowering the

power supply voltage.

1.3.2 Receiving sensitivity

Model No.

Min

Typ

Max

Unit

Remark

LoRa SX-1276 1W

module

-147.2

-148.0

-149.2

dBm

●The current sensitivity is tested under the Coding rate of

4/5 and spread spectrum factor of 12

●Due to the error of the materials, each LRC component

has ±0.1% error, so error accumulation will occur since

multiple LRC components are used in the whole RF circuit,

and the transmitting currents will be different at different

modules;

●The receiving sensitivity will be reduced and range will be

shortened while increasing the air data rate.

1.3.3 Recommended Frequency

Model No

Min

Typ

Max

Unit

Remark

SX127X RF Module User Manual of E19 Series Modules

LoRa SX-1276 1W

module

900.0

915.0

931.0

MHz

●It ensures that the performance of the module can reach

the standard if it works in recommended operating

frequency.

●It is recommended to avoid the crowded frequencies, such

as 433.0MHz, 868.0MHz, 915MHz and other integer

frequencies.

1.4 Tested distance

Model No

Min

Typ

Max

Unit

Remark

LoRa SX-1276 1W

module

9000

10000

11000

● The external antenna used is of 5dBi gain and vertical

polarization;

● The interval between each data packet is 2s, sending 100

packets with 30 bytes in each packet, the range at data lose

rate of lower than 5% is valid range;

● In order to obtain meaningful and reproduceable results,

we conducted the tests under in clear weather with little

electromagnetic interference at suburb areas；

● Distance may be shorter with interference or obstacles.

2. Pin definition

2.1.2 LoRa SX-1276 1W module

Pin No.

Name

Direction

Usage

GND

Ground electrode, connected to the power reference ground.

DIO5

Input/Output

Configurable IO port（Please find more on SX127X datasheet）.

DIO4

Input/Output