Article  Outline 

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.

1.2 Features

• The measured communication distance can reach 3km；

• Maximum transmission power of 20dBm，software multi-level adjustable；

• Supports ISM 868MHz/915MHz band；

• Supports 0.5Kbps～300Kbps transmission rate；

• Supports low power mode, suitable for battery；

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

• Supports 2.6V～3.6V power supply；

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

• IPEX and stamp hole optional，good for secondary development and integration.

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
  

Specification and parameters

2.1 Limit parameter

2.2 Operating paramete

Size and pin definition

Basic circuit

FAQ

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.