Ebyte E49-900T20S User manual

E49-900T20S User Manuel
868MHz/915MHz SMD Wireless Module

Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
CONTENTS
DISCLAIMER......................................................................................................................................3
1. OVERVIEW..................................................................................................................................... 4
1.1 INTRODUCTION..............................................................................................................................................................4
1.2 FEATURES...................................................................................................................................................................... 4
2. SPECIFICATION AND PARAMETER........................................................................................ 5
2.1 LIMIT PARAMETER......................................................................................................................................................... 5
2.2 OPERATING PARAMETER................................................................................................................................................ 5
3. SIZE AND PIN DEFINITION........................................................................................................6
4. RECOMMENDED WIRING DIAGRAM.....................................................................................7
5. FUNCTION DESCRIPTION..........................................................................................................8
5.1 MODULE RESET............................................................................................................................................................. 8
5.2 AUX DETAILED EXPLANATION...................................................................................................................................... 8
5.2.1 Wireless receiving indication................................................................................................................................. 8
5.2.2 Wireless transmission indication........................................................................................................................... 8
5.2.3 Reset and exit sleep mode...................................................................................................................................... 9
5.2.4 AUX Precautions................................................................................................................................................... 9
5.2.5 Detailed explanation of fixed-point mode.............................................................................................................. 9
5.2.6 Broadcast transmission....................................................................................................................................... 10
5.2.7 Broadcast address................................................................................................................................................ 10
5.2.8 Monitor Address.................................................................................................................................................. 11
6. OPERATING MODE.................................................................................................................... 11
6.1 MODE SWITCHING....................................................................................................................................................... 11
6.2 TRANSMISSION MODE（MODE0）..............................................................................................................................12
6.3 RSSI MODE（MODE1）.............................................................................................................................................12
6.4 SETTING MODE（MODE2）....................................................................................................................................... 13
6.5 SLEEP MODE（MODE3）........................................................................................................................................... 13
6.6 FAST COMMUNICATION TEST...................................................................................................................................... 13
7. COMMAND FORMAT.................................................................................................................14
7.1 DEFAULT PARAMETERS...............................................................................................................................................15

Chengdu Ebyte Electronic Technology Co., Ltd E49-900T20S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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7.2 READING OPERATING PARAMETER..............................................................................................................................15
7.3 READING VERSION NUMBER READING........................................................................................................................ 15
7.4 PARAMETER SETTING INSTRUCTION............................................................................................................................15
8. HARDWARE DESIGN................................................................................................................. 18
9.1 COMMUNICATION RANGE IS TOO SHORT......................................................................................................................19
9.2 MODULE IS EASY TO DAMAGE.....................................................................................................................................19
9.3 BER(BIT ERROR RATE)IS HIGH..................................................................................................................................19
10. WELDING OPERATION GUIDANCE....................................................................................20
10.1 REFLOW SOLDERING TEMPERATURE.........................................................................................................................20
10.2 REFLOW SOLDERING CURVE..................................................................................................................................... 20
13 BATCH PACKAGING................................................................................................................ 21
REVISION HISTORY...................................................................................................................... 21
ABOUT US......................................................................................................................................... 21

Chengdu Ebyte Electronic Technology Co., Ltd E49-900T20S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
3
Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

Chengdu Ebyte Electronic Technology Co., Ltd E49-900T20S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
1. Overview
1.1 Introduction
E49-900T20S is an ultra-high cost-effective wireless module launched by
Chengdu Ebyte. It has 4 operating modes. Each transmission mode has its own
characteristics and can be applied to various application scenarios. E49-900T20S
can perfectly support industrial-grade applications, and undergoes rigorous testing
at the factory to ensure its industrial reliability and batch consistency.
The E49-900T20S supports a maximum transmission power of 20dBm. Users
can set a lower output power to save power consumption. The module works at
868-915MHz, with TTL level output, and is compatible with 3.3V. The module has data encryption function. The data
transmitted by the module in the air is random. Through strict encryption and decryption algorithms, the data interception
is meaningless, the probability of interference is reduced, and the reliability and transmission efficiency are improved.
Besides, it is a low-cost wireless serial transceiver module.
1.2 Features
The measured communication distance can reach 2.5km;
Maximum transmit power is 100mW, software can be adjusted in multiple stages;
The global license-free ISM 868MHz/915MHz;
Data transmission rate :1.2Kbps～200Kbps;
Low power consumption mode, suitable for battery application;
Advanced ultra-narrowed GFSK modulation;
2.6V~5.5V power supply;
Industrial-grade standard design, support long-term use of -40 ~ 85°C;
Support stamp hole and IPEX interface, users can choose to use according to their needs.
1.3 Application Scenario
Wearable devices;
Security system, Positioning system;
Wireless remote control, unmanned drone;
Health care product；
Wireless voice, wireless headphones;
Automobile industry application.

Chengdu Ebyte Electronic Technology Co., Ltd E49-900T20S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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2. Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remark
Min.
Max.
Power supply（V）
0
5.5
Voltage over 5.5V will cause permanent
damage to module
Blocking power（dBm）
-
10
Chances of burn is slim when modules
are used in short distance
Operating temperature（℃）
-40
85
2.2 Operating parameter
Main parameter
Performance
Remark
Min.
Typ.
Max.
Operating voltage（V）
2.6
5
5.5
Over 5.5V will permanently damage
module
Communication level（V）
3.3
For 5V TTL, it may be at risk of burning
down
Operating temperature（℃）
-40
-
80
Industrial design
Operating frequency（MHz）
850
868
930
Support ISM band
Power
consumption
TX current（mA）
97.9
Instant power consumption
RX current（mA）
12.04
Sleep current（μA）
1.3
Software is shut down
Max Tx power（dBm）
-
-
20.0
Receiving sensitivity（dBm）
-114
-115
-116
Air data rate is1.2kbps
Air data rate（bps）
1.2k
2.4k
200k
Controlled via user’s programming
Main parameter
Description
Remark
Distance for reference
2500m
Test condition：clear and open area, antenna gain:
5dBi,antenna height:2.5m，air data rate:1.2kbps
FIFO
54 Byte
Maximum capacity of single transmission, auto-sub-packing
when exceeding
Cache capacity
500 Byte
Modulation
GFSK
Communication interface
UART serial port
Package
SMD
Connector
1.27mm
Size
26*16mm
Antenna
IPEX/Stamp hole
50 ohm impedance

Chengdu Ebyte Electronic Technology Co., Ltd E49-900T20S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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3. Size and pin definition
No.
Name
Direction
Function
1
GND
Module ground wire
2
GND
Module ground wire
3
GND
Module ground wire
4
GND
Module ground wire
5
M0
Input（pull up when
it’s weak）
Cooperate with M1 to determine 4 operating modes of the module(can be lifted
floating, the module contains pull-up resistor）
6
M1
Input
（pull up when
it’s weak）
Cooperate with M0 to determine 4 operating modes of the module(can be lifted
floating, the module contains pull-up resistor）
7
RXD
Input
TTL serial input, connect to external TXD output pin;
8
TXD
Output
TTL serial input, connect to external RXD output pin;
9
AUX
Output
Used to indicate the working status of the module; the user wakes up the external
MCU and outputs a low level during the power-on self-test initialization
10
VCC
Module power supply positive reference, voltage range: 2.6V ~ 5.5V DC
11
GND
Module ground wire
12
NC
13
GND
Module ground wire
14
NC
15
NC

Chengdu Ebyte Electronic Technology Co., Ltd E49-900T20S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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16
NC
17
NC
18
NC
19
GND
Module ground wire
20
GND
Module ground wire
21
ANT
antenna
22
GND
Module ground wire
4. Recommended wiring diagram
No.
Brief introduction of connection between the module and the single-chip microcomputer (the above picture uses
STM8L single-chip microcomputer as an example)
1
The wireless serial port module is TTL level, please connect with MCU with TTL level.
2
Some 5V microcontrollers may require 4 ~ 10K pull-up resistors on the TXD and AUX pins of the module.

Chengdu Ebyte Electronic Technology Co., Ltd E49-900T20S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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5. Function description
5.1 Module reset
After the module is powered on, AUX will immediately output a low level and perform a hardware self-test and set
the operating mode according to user parameters. In this process, AUX is kept at a low level, outputs a high level after
completion, and starts to work normally according to the working mode composed of M1 and M0. Therefore, users need
to wait for the rising edge of AUX as the starting point for the normal operation of the module.
5.2 AUX detailed explanation
AUX is used for wireless sending and receiving buffer indication and self-inspection indication.
It indicates whether the data of the module that has not been transmitted through the wireless, or whether it has
received wireless data that has not been transmitted through the serial port, or the module is in the process of initial
self-test.
5.2.1 Wireless receiving indication
After receiving the valid wireless data, the module will immediately pull AUX low and start the serial port to output
data and then pull up AUX after the data output is completed.
5.2.2 Wireless transmission indication
After receiving the serial port data, the module will immediately pull down AUX and start sending data wirelessly
and after all the data is sent, pull up AUX.

Chengdu Ebyte Electronic Technology Co., Ltd E49-900T20S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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5.2.3 Reset and exit sleep mode
Only when resetting and exiting sleep mode
5.2.4 AUX Precautions
The function 1 and function 2 mentioned above have low output priority, that is, if any output low condition is met,
AUX outputs a low level; when all low level conditions are not met, AUX outputs a high level.
When the AUX output is low, it indicates that the module is busy, and the operating mode detection will not be
performed; when the AUX output is high, the mode switching will be completed.
When the user enters other modes from mode 3 (sleep mode) or during the reset process, the module will reset the user
parameters, during which AUX outputs low level.
5.2.5 Detailed explanation of fixed-point mode