Ebyte E28-2G4M12 Series Manuel utilisateur

E28-2G4M12XX User Manual

SX1280 2.4GHz SMD Wireless Module

Chengdu Ebyte Electronic Technology Co., Ltd.

Manual

E28-2G4M12S User

E28-2G4M12XX User Manual .............................................................................................................................................. 1

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

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

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

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

2. Specification and parameter ...................................................................................................................................... 4

2.1 Limit parameter ....................................................................................................................................................... 4

3. Size and pin definition ........................................................................................................................................................5

4. Basic operation ................................................................................................................................................................... 7

4.1 Hardware design ...................................................................................................................................................... 7

4.2 Software editing .......................................................................................................................................................7

5. Basic application ...............................................................................................................................................8

5.1 Basic circuit diagram ............................................................................................................................................... 8

6. FAQ .................................................................................................................................................................................... 8

6.1 Communication range is too short ...........................................................................................................................8

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

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

7. Production guidance ....................................................................................................................................... 10

7.1 Reflow soldering temperature ............................................................................................................................... 10

9.2 Antenna selection .................................................................................................................................................. 12

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

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

Chengdu Ebyte Electronic Technology Co., Ltd.

Manual

E28-2G4M12S User

1-2

1. Overview

1.1 Brief introduction

E28-2G4M12S/SX is a 2.4GHz bluetooth module designed by Chengdu Ebyte,with long distance and ultra-low

power consumption. E28-2G4M12XX is small-sized SMD module(pin spacing 1.27mm),built-in PCB antenna and

IPEX antenna. High precision 52MHz crystal is used.

Based on the original imported RF chip SX1278 from SEMTECH,The IC SX1280 features multiple physical

layers and various modulating methods such as LoRa, FLRC and GFSK, the special modulating methods and

processing ways enable longer operating range under LoRa and FLRC modulating methods, and the GFSK method

covers BLE protocol. The outstanding ultra-low power consumption and the DC-DC and Time-of-Flight on chip make

the chip much more capable for smart home, security system, tracking and locating, wireless distance measuring,

wearable electronics, smart bracelet and health management & etc. SX1280 supports RSSI,users need to conduct a

secondary development based on their own demands;SX1280 also integrates time of flight for ranging functions.

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 3km；



Maximum transmission power of 18mW, software multi-level adjustable；



Compatible with BLE protocol；



Support the global license-free ISM 2.4GHz band；



Support air date rate of 0.476kbps～2Mbps；



Support multiple modulation methods, (GFSK Mode ，FLRC Mode，LoRa Mode)；



Large capacity FIFO, supports 256Byte data buffer；



Support 1.8V~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；



IPEX and PCB antenna optional, good for secondary development and integration；



The air data rate is adjustable, the maximum air data rate is up to 1.3 Mbps in FLRC mode；



Excellent anti-blocking properties；



Ranging, with Time-of-flight function.

1.3 Application



Home security alarm and remote keyless entry；



Smart home and industrial sensors；



Wireless alarm security system；

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Manual

E28-2G4M12S User

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

Building automation solutions；



Wireless industrial-grade remote control；



Health care products；



Advanced Meter Reading Architecture(AMI)；

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Manual

E28-2G4M12S User

1-4



Automotive industry applications.

2.Specification and parameter

2.1 Limit parameter

Main parameter

Model

Remark

E28-2G4M12S

E28-2G4M12SX

Power supply（V）

0～3.6

Voltage over 3.6V will cause permanent

damage to module

Blocking power（dBm）

Chances of burn is slim when modules are

used in short distance

Operating temperature（℃）

-40～+85

2.2 Operating parameter

Main parameter

Model

Remark

E28-2G4M12S

E28-2G4M12SX

Operating voltage（V）

1.8～3.6

≥3.3 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）

2400～2500

Support ISM band

Power

consumpti

TX current（mA）

Instant power consumption

RX current（mA）

Sleep current （μA）

2.0

Software is shut down

Max Tx power（dBm）

12～14

Receiving sensitivity（dBm）

-128～-130

air data rate:595kbps

Air data rate

LoRa24（bps）

0.595k～253.9k

Programming

FLRC（bps）

260k

1.3M

Programming

FSK（bps）

125k～2M

Programming

Main parameter

Description

Remark

Model

E28-2G4M12S

E28-2G4M12SX

Distance for reference

3000m

Test condition：clear and open area, antenna gain:

5dBi，antenna height: 2.5m，air data rate: 595kbps

FIFO

256Byte

Max length transmitted each time

Crystal frequency

52MHz

Modulation

LoRaTM

(recommen

ded)

LoRaTM

(recomm

ended)

GFSK Mode ，FLRC Mode，

LoRa Mode

Package

SMD

Connector

1.27mm

IPEX/PCB

Chengdu Ebyte Electronic Technology Co., Ltd.

Manual

E28-2G4M12S User

1-5

3.Size and pin definition

THE SIZE OF E28-2G4M12S

THE SIZE OF E28-2G4M12SX

Communication

interface

SPI

0-10Mbps

Size

24* 15*0.8

17.8*15

*0.8 mm

Antenna

Stamp hole

/IPEX

IPEX

weight

1.6±0.1g

1.1±0.1g

Chengdu Ebyte Electronic Technology Co., Ltd.

Manual

E28-2G4M12S User

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Pin No

Pin item

Pin direction

Pin application

VCC

Power supply: 1.8~3.6V (Ceramic filter capacitor is advised to add)

GND

Ground, connecting to power supply reference ground

MISO_TX

Output

SPI data output pin,can be used as UART transmitting pin

MOSI_RX

Input

SPI data input pin,can be used as UART receiving pin

SCK_RTSN

Input

SPI clock input pin,can be used as UART request transmitting pin

NSS_CTS

Input

Module chip selection pin, used to start a SPI communication; and can be used as

UART clearing transmitting pin(refer to SX1280 Datasheet)

GND

Ground, connecting to power supply reference ground

GND

Ground, connecting to power supply reference ground

NRESET

Input

Chip reset initiation input pin, valid under low level, built-in 50k pull-up resistor

BUSY

Output

Status indication (refer to SX1280 Datasheet)

DIO1

Input / Output

Configurable IO port（Please find more on SX1280 datasheet）

DIO2

Input / Output

Configurable IO port（Please find more on SX1280 datasheet）

DIO3

Input / Output

Configurable IO port（Please find more on SX1280 datasheet）

GND

Ground, connecting to power supply reference ground

Chengdu Ebyte Electronic Technology Co., Ltd.

Manual

E28-2G4M12S User

1-7

4.Basic operation

4.1 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.

4.2 Software editing



This module is based on SX1280,same drive way as SX1280,user can refer to SX1280 datasheet.

Chengdu Ebyte Electronic Technology Co., Ltd.

Manual

E28-2G4M12S User

1-8



DIO is general I/O port，see more in SX1280 datasheet.



GDO 2 is generally configurated as IRQ function, IRQ pin can also be disconnected. The SPI query mode can be

used to obtain the interrupt status. However, it is recommended to use the external interrupt of the MCU.



After SX1280 restores IDLE mode or configures sleep mode, it is recommended that the power configuration

table be reinitialized.

5.Basic application

5.1 Basic circuit diagram

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.

Chengdu Ebyte Electronic Technology Co., Ltd.

Manual

E28-2G4M12S User

1-9



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.

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