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EBYTE E49-900M20S Product Manual Guide

Article  Outline 

E49-900M20S Overview

  1.1 E49-900M20S  Brief introduction

   1.2 Features

  1.3 Appliacation

Specification and parameters

  2.1 Limit parameter

  2.2 Operating parameter

size and pin definition

Basic circuit


E49-900M20S Overview

1.1 E49-900M20S  Brief introduction

E49-900M20S is a cost-effective wireless data transmission module launched by Chengdu Ebyte. It is A pure hardware module based on CMT2300A.

E49-900M20S Supports the maximum transmission power of 20dBm,users can set a lower output power , thus saving power consumption.The module works in the 850MHz ~ 930MHz frequency band, including the commonly used 868MHz and 915MHz frequency band.Since this module is a pure RF transceiver module, using SPI interface, needs MCU driver.

ebyte E49-900M20S

1.2 Features

  • The measured communication distance can reach 3km

  • Maximum transmission power of 20dBmsoftware multi-level adjustable

  • Supports ISM 868MHz/915MHz band

  • Supports 0.5Kbps300Kbps transmission rate

  • Supports low power mode, suitable for battery

  • Supports GFSK modulation mode, OOK & (G)MSK

  • Supports 2.6V3.6V power supply

  • Industrial grade standard design, support -40 ~ 85 °C for working over a long time

  • IPEX and stamp hole optionalgood for secondary development and integration.

E49-900M20S long transmission distance.jpg

1.3 Application

  • Smart home and industrial sensors;

  • Security, positioning system;

  • Wireless remote control, UAV;

  • Wireless game remote control;

  • Healthcare products;

  • Wireless voice, wireless headset;

  • Car industry

E49-900M20S application.jpg

Specification and parameters

2.1 Limit parameter

e49 Limit parameters.jpg

2.2 Operating parametee49 operating parameters.jpg

Size and pin definition

e49 pin.jpg

Basic circuit

e49 basic circuit.jpg


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;ea 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.

Module is easy to damage

  • Please check the power supply source, ensure it is between recommends, voltage higher than the maximum will damage the module;

  • Please check the stability of power source, the voltage cannot fluctuate too much;

  • Please make sure anti-static 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.

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;

  • SPI clock waveform is not standard, check whether there is interference on the SPI line, SPI bus wiring should not be too long;

  • 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.