Ebyte E31-400M17S User manual

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
1
E31-400M17S

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
1
Contents
1.Overview..............................................................................................................................................................................2
1.1 Introduction............................................................................................................................................................... 2
1.2 Main Features:........................................................................................................................................................... 2
1.3 Applications...............................................................................................................................................................2
2 Parameters............................................................................................................................................................................3
2.1 Limit Parameters....................................................................................................................................................... 3
2.2 Working Parameters.................................................................................................................................................. 3
3. Sizes and Pins Definition....................................................................................................................................................5
4 User Guide........................................................................................................................................................................... 6
4.1 Notice for Hardware.................................................................................................................................................. 6
4.2 Programming............................................................................................................................................................. 7
5 Electronic Diagram.............................................................................................................................................................. 7
5.1 Circuit Diagram......................................................................................................................................................... 7
6 FAQ..................................................................................................................................................................................... 8
6.1 Communication range is too short.............................................................................................................................8
6.2 Module is easy to damage......................................................................................................................................... 8
6.3 BER (Bit Error Rate) is high..................................................................................................................................... 8
7.1 Reflow Soldering Temperature................................................................................................................................. 9
7.2 Reflow soldering curve..............................................................................................................................................9
8 Models:.............................................................................................................................................................................. 10
9 Antenna Guidance............................................................................................................................................................. 10
9.1 Antenna Recommendation...................................................................................................................................... 10
9.2 Antenna Interface Choosing.................................................................................................................................... 10
10 Revision History.............................................................................................................................................................. 11
About us................................................................................................................................................................................11

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
2
1.Overview
1.1 Introduction
Designed by Ebyte, E31-400M17S is a micro-size(pin pitch:1.27mm) long range RF transceiving
module with 400MHz central frequency(Range:425-450.5MHz); Based on AXSEM's AX5243 RF chip
—a narrow-band multi-channel single-chip, the module has multiple modulation methods such as FSK /
MSK / 4-FSK / GFSK.The module antenna interface is IPEX stamp hole. The Module uses a 26MHz
±1ppm industrial grade high precision low temperature drift active crystal oscillator to ensure the accuracy of wireless frequency,
industrial performance and its stability.
The module is a pure RF transceiving hardware which requires MCU drivers or special SPI tool to configure before being put in
work.
1.2 Main Features:
The measured actual communication distance can reach 2km;
The maximum transmission power is 17dBm (50mW);
Broadband design 400MHz-525MHz, supporting the global license-free ISM 433MHz band;
High receiving sensitivity and high receiving selectivity;
Optional FEC, and automatic channel noise level tracking;
Support multiple modulation modes (FSK / MSK / 4-FSK / GFSK / GMSK / ASK / AFSK / FM / PSK);
Support wireless wake-up;
Support DC 1.8 ~ 3.6V power supply, DC 3.3V-3.6V can guarantee the best performance;
Industrial grade standard design, support long-term use from -40 to +85 °C;
Small size design for easy integration;
Dual antenna interface design (IPX/stamp hole) for easy secondary development and easy integration.
1.3 Applications
Smart home and industrial sensors;
Wireless meter reading (AMR);
Building automation;
Wireless network;
Wireless remote control, drone;
Health care products;
Wireless audio, wireless headset;
Compatible with: Wireless M-Bus, POCSAG, FLEX, KNX, Sigfox, Z-Wave, enocean;

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
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2 Parameters
2.1 Limit Parameters
Main Parameters
Value
Remarks
Min.
Max
Input Voltage(V)
0
3.6
Permanent damage occurred when voltage is over 3.6V
Blocking Power(dBm)
-
10
Low chance to be damaged for short-distance transceiving
Working Temp.(℃)
-40
+85
Industrial Grade
Storage Temp.(℃)
-60
+150
-
2.2 Working Parameters
Main Parameters
Value
Remarks
Mi
n.
Typical
Max.
Working Voltage(V)
1.8
3.3
3.6
DC 3.3V-3.6V can guaranty Max TX power
Tx Electrical Level(V)
-
3.3
-
5V TTL could cause permanent damage
Working Temp(℃)
-40
25
+85
Industrial Grade
Working Frequency Channel(MHz)
400
433
525
Applicable for ISM channel
Power
Consumption
TX Current(mA)
70
80
90
Instantaneous power(could be different due to different Antenna
performance)
RX Current(mA)
12
13
14
Current when module receiving data.
Sleeping Current(μA)
0.05
0.5
1
Deep sleep at ultra low power consumption(low frequency)
Max TX Power(dBm)
16
17
18
-
RX Sensitivity(dBm)
-
-135
-
At 0.1 kbps air rate
Air Rate(kbps)
-120
-121
-122
At 1.2kbps air rate(FSK/FEC)
Air Rate Range
0.1k
-
125
Adjustable by user

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
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Parameters
Value
Remarks
Reference Tranceiving Range
2000m
Conditions: Clear Sky, Antenna Gain 5dBi,
Antenna Height 2.5m, Air rate 1.2kbps
FIFO
256Byte
Max Length for single time transmitting
TCXO Frequency
26MHz
±1ppm
Protocol
GFSK(suggested)
FSK / MSK / 4-FSK / GFSK / GMSK / ASK / AFSK
/FM / PSK
Encapsulation
SMD
/
Interface Type
1.27mm
/
Communication Port
SPI
0-10Mbps
Size
20*14mm
/
Weight
1.35±0.1g
/
Antenna Interfaces
IPEX/Stamp Hole
Stamp hole is suggested not to be connected
when using IPX only, equivalent Impedance is
around 50Ω

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
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3. Sizes and Pins Definition
No.
Name
Type
Functions
1
GND
P
Ground wire, connected to the power reference ground
2
GND
P
Ground wire, connected to the power reference ground
3
GND
P
Ground wire, connected to the power reference ground
4
GND
P
Ground wire, connected to the power reference ground
5
GND
P
Ground wire, connected to the power reference ground
6
NC
-
Suspended Port
7
NC
-
Suspended Port
8
SYSCLK
I/O
Crystal oscillator output；（see details from AX5243 manual）
9
VCC
P
Power supply, range 1.8 ~ 3.6V (additional external ceramic filter capacitor
suggested)
10
GND
P
Ground wire, connected to the power reference ground
11
GND
P
Ground wire, connected to the power reference ground
12
GND
P
Ground wire, connected to the power reference ground
13
TCX0-P
I
The internal TCXO power supply of the module needs to be linked with the 14
pin when the TCXO pin of the AX5243 is enabled.
14
TCX0-EN
I/O
AX5243 external TCXO pin; (see AX5243 manual for details)
15
IRQ
I/O
Transceiver data interrupt; (see AX5243 manual for details)
16
SPI-MISO
O
SPI data output pin; (see AX5243 manual for details)

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
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17
SPI-MOSI
I
SPI data input pin; (see AX5243 manual for details)
18
SPI-CLK
I
SPI clock input pin; (see AX5243 manual for details)
19
SPI-NSS
I
Module chip select pin for starting an SPI communication; (see AX5243
manual for details)
20
GND
P
Ground wire, connected to the power reference ground
21
ANT
A
Antenna interface, stamp hole (50 ohm characteristic impedance)
22
GND
P
Ground wire, connected to the power reference ground
4 User Guide
4.1 Notice for Hardware
It is recommended to use DC stabilized power supply. The power supply ripple factor should be as small as possible, and
the module should be reliably grounded.
Please ensure that the positive and negative poles of the power supply are properly connected. If the reverse connection is
made, the module may be permanently damaged.
Please ensure the power supply voltage is within the working voltage range. If the maximum voltage is exceeded, the
module will be permanently damaged.
Please check the stability of the power supply, and the voltage cannot be fluctuated frequently;
When designing the power supply circuit for the module, it is recommended to reserve more than 30% of the margin to
achieve long-term stable operation of the system;
The installation location of 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 avoid module locations. If the
wiring must pass under the module, assuming that the module is soldered to the Top Layer, the area where the module is in
contact with the Top Layer should be covered with copper (all copper is well grounded), and the area must be close to the digital
part of the module and routed in the Bottom Layer;
If the module is soldered or placed in the Top Layer, it is wrong to randomly route on the Bottom Layer or other layers,
which will affect the spurs and receiving sensitivity of the module to varying degrees;
If there is a device with large electromagnetic interference around the module, it will greatly affect the performance of the
module. It is recommended to maintain the distance from the module according to the strength of the interference. If
circumstances permit, it is recommended to do proper isolation and shielding;
If there are wirings with large electromagnetic interference around the module (such as high frequency digital, high
frequency analog, power line), the performance of the module will be greatly affected. It is recommended to do proper isolation
and shielding;
If the communication line uses 5V level, it must be connected in series with a 1k-5.1k resistor (not recommended, there is
still risk of damage);
Try to keep away from some physical layers as much as possible to avoid electromagnetic interference to other devices;
The antenna installation has a great influence on the performance of the module. Make sure that the antenna is exposed and
preferably vertical. When the module is installed inside the casing, it is recommended to use a good antenna extension cable to
extend the antenna to the outside of the casing;
The antenna must not be installed inside the metal case, which will greatly reduce the transmission distance.

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
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4.2 Programming
This module is developed based on AX5243, and its driving method is completely equivalent to AX5243. Users can operate in
full accordance with AX5243 user manual;
IRQ function can be disconnected and use SPI query to obtain the interrupt status, but it is recommended to use the external
interrupt of the microcontroller.
After the sleep mode is configured on the AX5243, it is recommended to re-initialize the power configuration table.
5 Electronic Diagram
5.1 Circuit Diagram
Via R1 and R2, Module TCXO power can be choosed either from the external microcontroller or enabling AX5243

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
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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.
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.
6.2 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.
6.3 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;
The clock waveform on the SPI is not standard: Check whether there is interference on the SPI line or the SPI bus
line should not be too long.

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
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7 Soldering Guidance
7.1 Reflow Soldering Temperature
Profile Feature
Curve characteristics
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Solder paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min (Tsmin)
Min preheating temp.
100℃
150℃
Preheat temperature max (Tsmax)
Mx preheating temp.
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
Preheating time
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
Average ramp-up rate
3℃/second max
3℃/second max
Liquidous Temperature (TL)
Liquid phase temp.
183℃
217℃
Time(tL)Maintained Above(TL)
Time below liquid phase
line
60-90 sec
30-90 sec
Peak temperature(Tp)
Peak temp.
220-235℃
230-250℃
Average ramp-down rate(Tp to Tsmax)
Average ramp-down rate
6℃/second max
6℃/second max
Time 25℃ to peak temperature
Time to peak temperature
for 25℃
6 minutes max
8 minutes max
7.2 Reflow soldering curve

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
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8 Models:
Model
Chip
Freq. Range
Power
Tested
Communicating
Range
Size
Encapsulation
Communicating
Interface
Hz
dBm
km
mm
E31-433T17S3
AX5243
425-450.5MHz
17
3
26*16
SMD
TTL
E31-433T30S
AX5243
425-450.5MHz
30
8
40.5*25
SMD
TTL
E31-400M17S
AX5243
400-525MHz
17
3
20*14
SMD
SPI
9 Antenna Guidance
9.1 Antenna Recommendation
Antenna lays an important role in the communication process. Inferior antennas often have a great negative impact on the
communication system. Therefore, we recommend below antennas which are compliant with our wireless modules and have excellent
performance and reasonable price.
Model
Type
Freq.
Gain
Size
Feeder
Length
Interface
Features
Hz
dBi
mm
cm
TX2400-PCB-5010
FPC antenna
2.4G
2.0
10x50
-
IPEX
Flexible FPC soft antenna
TX2400-JZ-3
Plastic Antenna
2.4G
2.0
30
-
SMA-J
Ultra short straight, omnidirectional antenna
TX2400-JZ-5
Plastic Antenna
2.4G
2.0
50
-
SMA-J
Ultra short straight, omnidirectional antenna
TX2400-JW-5
Plastic Antenna
2.4G
2.0
50
-
SMA-J
Fixed bending, omnidirectional antenna
TX2400-JK-11
Plastic Antenna
2.4G
2.5
110
-
SMA-J
Foldable, omnidirectional antenna
TX2400-JKD-20
Plastic Antenna
2.4G
3.0
200
-
SMA-J
Foldable, omnidirectional antenna
TX2400-XPL-150
Sucker Antenna
2.4G
3.5
150
150
SMA-J
Small suction antenna, cost-effective
9.2 Antenna Interface Choosing
The module has two antenna interface modes: IPX and stamp hole. When using the IPEX interface, it is recommended not to connect
that the stamp hole interface.

Chengdu Ebyte Electronic Technology Co.,Ltd E31-400M17S User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
11
10 Revision History
Version
Date
Description
Issued by
1.0
2019-08-15
Initial version
--
1.1
2019-8-20
Error correction
Lyl
About us
Website: www.ebyte.com Sales: [email protected] Support: [e-mail]
Tel: [phone] Ext. 812 Fax: [phone]
Address: Innovation Center B333~D347, 4# XI-XIN road,High-tech district (west), Chengdu, Sichuan, China