Ebyte E49-400m20s 470mhz Smd Module User Manual

EBYTE E49-400M20S 470MHz SMD Module User Manual

Overview

Brief Introduction

E49-400M20S is a cost-effective wireless data transmission module launched by Chengdu Ebyte. It is a pure hardware module based on CMT2300A. E49 400M20S supports a maximum transmit power of 20dBm, and users can set a lower output power to save power consumption. The module works in the 410MHz ~ 510MHz frequency band, covering the commonly used 433MHz and 470MHz frequency bands. Since this module is a pure RF transceiver module, it uses an SPI interface and requires an MCU driver.

Key Features

• The measured communication distance can reach 2.5km;
• The maximum transmit power is 20dBm, and the software can be adjusted in multiple levels;
• Support ISM 433MHz/470MHz frequency band;
• Support data transmission rate from 0.5Kbps to 300Kbps;
• Support low power consumption mode, suitable for battery applications;
• Support GFSK modulation and OOK and (G)MSK;
• Support 2.6V～3.6V power supply;
• Industrial grade standard design, support long-term use at -40～85℃;
• Support stamp hole and IPEX interface, users can choose to use according to their own needs.

Application

• Smart home and industrial sensors, etc.;
• Security system, positioning system;
• Wireless remote control, UAV;
• Wireless game remote control;
• Healthcare products;
• Wireless voice, wireless headset;
• Automotive industry applications

Specification and Parameter

Limit parameter

Table 2-1 Limit parameter table

Working Parameters

Table 2-2 Limit parameter table

Size and pin definition

Image 3-1 Mechanical Dimensions and Pin Definition

Chart 3-1 Pin definition table

Hardware and Software Notice

Hardware Notice

• It is recommended to use a DC stabilized power supply to supply power to the module. The power supply ripple coefficient 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, such as reverse connection may cause permanent damage to the module;
• Please check the power supply to ensure that it is between the recommended power supply voltage, if exceeding the maximum value will cause permanent damage to the module;
• Please check the power supply stability, the voltage cannot fluctuate significantly and frequently;
• When designing the power supply circuit for the module, it is often recommended to reserve more than 30%of the margin, so that the whole machine is conducive to long-term stable work;
• The module should be as far away as possible from the power supply, transformer, high-frequency wiring and other parts with large electromagnetic interference;
• High-frequency digital traces, high-frequency analog traces, and power traces must be avoided under the module. If it is absolutely necessary to pass under the module, it is assumed that the module is soldered to the Top Layer, and copper is laid on the Top Layer of the module contact part (all copper And well grounded), must be close to the digital part of the module and the wiring is on the Bottom Layer;
• Assuming that the module is soldered or placed on the Top Layer, it is also wrong to randomly route on 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 of the module. It is recommended to stay away from the module according to the intensity of the interference. If the situation permits, proper isolation and shielding can be done;
• It is assumed that there are traces with high electromagnetic interference around the module (high-frequency digital, high-frequency analog, and power traces), which will greatly affect the performance of the module. It is recommended to stay away from the module according to the intensity of the interference. Isolation and shielding;
• Try to stay away from the TTL protocol which is also 2.4GHz in some physical layers, for example: USB3.0;
• The antenna installation structure has a great impact on the performance of the module. Make sure that the antenna is exposed, preferably vertically. When the module is installed inside the chassis, you can use high-quality antenna extension cords to extend the antenna to the outside of the chassis;
• The antenna must not be installed inside the metal shell, which will greatly weaken the transmission distance.

Software Notice

• The chip of this module is CMT2300A, and its driving mode is SPI, and users can operate according to the CMT2300AchipDatasheet.
• GPIO1/GPIO2/GPIO3 are general-purpose I/O ports, see CMT2300A Datasheet for details.

Basic Circuit Diagram

Chart 5-1 circuit diagram

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.
• 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.

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 source, the voltage cannot fluctuate too much.
• Please make sure antistatic 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;
• 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;

Guide for Soldering work

Reflow soldering temperature

Reflow soldering curve

Similar Products with CMT2300A

Recommendation for Antennas

The antenna is very important for the RF module, and the antenna performance will have a great impact on the communication system. Therefore, we recommend you below antennas which are suitable for Ebyte modules with excellent performance and reasonable price: Please search the model and see more antenna details on: http://www.ebyte.com/en/product-class.aspx?key=TX

Revision history 

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