Ebyte E10-433MS User manual

E10-433MS User Manual
SI4438 433MHz 100mW SMD Wireless Module

Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
1
Contents
Disclaimer.............................................................................................................................................................................. 2
1 Overview............................................................................................................................................................................. 3
1.1 Brief introduction........................................................................................................................................................... 3
1.2 Feature...................................................................................................................................................................... 3
1.3 Application................................................................................................................................................................3
2 Specification and parameter............................................................................................................................................. 4
2.1 Limit parameter.........................................................................................................................................................4
2.2 Operating parameter................................................................................................................................................. 4
3 Size and pin definition....................................................................................................................................................... 5
4. Basic operation..................................................................................................................................................................6
4.1 Hardware design....................................................................................................................................................... 6
4.2 Software editing........................................................................................................................................................7
5 Basic application..........................................................................................................................................................8
5.1 Basic circuit diagram................................................................................................................................................ 8
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...................................................................................................................................9
7 Production guidance.......................................................................................................................................................... 9
7.1 Reflow soldering temperature...................................................................................................................................9
Revision history...................................................................................................................................................................12
About us............................................................................................................................................................................... 12

Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
2
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. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
3
1 Overview
1.1 Brief introduction
E10-433MS is small SMD wireless module working at
433MHz developed based on chip SI4438 from Silicon Labs.
Due to the use of the imported SI4438 as the core of the
module, its stability has been well received by users, and
compatibility is not a concern. The module is aimed at smart home,
wireless meter reading, scientific research and medical, and medium
and long distance wireless communication equipment. Since RF
performance and component selection are in accordance with
industrial standards, and the product has obtained FCC, CE, RoHs
and other international authoritative certification reports, users do
not need to worry about its performance. With its stable and reliable
characteristics, it is favored by the majority of users. Compared with the old products, it has made great progress in
receiving current, receiving sensitivity, transmitting power, receiving rate range and anti-interference ability. High
precision 26MHz crystal is used.
Since the module is a pure RF transceiver module, you need to use the MCU driver or a dedicated SPI debug tool.
1.2 Feature
Communication distance tested is up to 2km
Maximum transmission power of 100mW, software multi-level adjustable；
Support the global license-free ISM 433MHz band；
Support air date rate of 1.2kbps～1000kbps；
Support multiple modulation methods, (G)FSK, 4(G)FSK, (G)MSK，OOK ；
Support 64/128 byte Transceiver Data Register (FIFO)
Support 2.5V~3.6V power supply, power supply over 3.3 V can guarantee the best performance；
Industrial grade standard design, support -40 ~ 85 °C for working over a long time；
SMA connector, good for connecting external antenna..
1.3 Application
Home security alarm and remote keyless entry；
Smart home and industrial sensors；
Wireless alarm security system；
Building automation solutions；
Wireless industrial-grade remote control；
Health care products；
Advanced Meter Reading Architecture(AMI)；
Automotive industry applications.

Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
4
2 Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remark
Min.
Max.
Power supply（V）
0
3.6
Voltage over 3.6V 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）
1.8
3.3
3.6
≥3.3 V ensures output power
Communication level（V）
3.3
For 5V TTL, it may be at risk of burning
down
Operating temperature（℃）
-40
-
85
Industrial design
Operating frequency（MHz）
425
433
525
Support ISM band
Power
consumpti
on
TX current（mA）
83
Instant power consumption
RX current（mA）
16
Sleep current （μA）
0.6
Software is shut down
Max Tx power（dBm）
19
20
21
Receiving sensitivity（dBm）
-121
-122
-124
Air data rate is 1kbps
Air data rate（bps）
0.123k
-
1M
Controlled via user’s programming
Main parameter
Description
Remark
Distance for reference
2000m
Test condition：clear and open area, antenna gain: 5dBi，antenna
height: 2.5m，air data rate: 1kbps
FIFO
64Byte
Max length transmitted each time
Crystal frequency
26MHz
Modulation
GFSK
(recommended)
(G)FSK, 4(G)FSK, (G)MSK，OOK
Package
SMD
Connector
1.27mm
Stamp hole
Communication interface
SPI
0-10Mbps
Size
14.5 * 18.5 mm

Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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Antenna
SMA-K
50 ohm impedance
3 Size and pin definition

Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
6
No.
Name
Direction
Function
1
GND
Ground
2
VCC
Power supply ：1.8~ 3.6 V DC, 3.3V is recommended
3
GPIO0
output
GPIO（see more from SI4438 datasheet）
4
GPIO1
output
GPIO（see more from SI4438 datasheet）
5
IRQ
output
SPI interrupt request
6
SCK
input
Serial Clock Input
7
MISO
output
SPI master output slave input
8
MOSI
input
SPI master input slave output
9
nSEL
input
SPI Chip select for starting SPI communication
10
SDN
Shutdown Input Pin. It is low level when working
(See SI4438 manual for more details)
11
ANT
Antenna
12
GND
Ground
4. Basic operation
4.1 Hardware design
It is recommended to use a DC stabilized power supply. The power supply ripple factor 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. Reverse
connection may cause permanent damage to the module；
Please check the power supply to ensure it is within the recommended voltage otherwise when it exceeds the
maximum value the module will be permanently damaged；
Please check the stability of the power supply, the voltage can not be fluctuated frequently；
When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the
margin, so the whole machine is beneficial for long-term stable operation.；
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 be avoided under the
module. If it is necessary to pass through the module, assume that the module is soldered to the Top Layer, and the
copper is spread on the Top Layer of the module contact part(well grounded), it must be close to the digital part of
the module and routed in the Bottom Layer；
Assuming the module is soldered or placed over the Top Layer, it is wrong to randomly route over 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

Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
7
affect the performance. It is recommended to keep them away from the module according to the strength of the
interference. If necessary, appropriate isolation and shielding can be done；
Assume that there are traces with large electromagnetic interference (high-frequency digital, high-frequency analog,
power traces) around the module that will greatly affect the performance of the module. It is recommended to stay
away from the module according to the strength of the interference.If necessary, appropriate isolation and shielding
can be done.
If the communication line uses a 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is
still a risk of damage)；
Try to stay away from some physical layers such as TTL protocol at 2.4GHz , for example: USB3.0；
The mounting structure of antenna has a great influence on the performance of the module. It is necessary to ensure
that the antenna is exposed, preferably vertically upward. When the module is mounted inside the case, use a good
antenna extension cable to extend the antenna to the outside；
The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly
weakened.
4.2 Software editing
GPIO0 \ GPIO1 \ GPIO2 \ GPIO3 are configurable I/O ports for various application ，see more in SI4438
datasheet.It can be floated when not used.
IRQ pin can also be disconnected. The SPI query mode can be used to obtain the interrupt status. However, it is
recommended to use the external interrupt of the MCU.
SPI communication rate should not be set too high, usually around 1Mbps.
Please refer to “Operating Modes and Timing” for SI4438 status switch，the switch between TX and RX should be
through Ready, can not be switched directly.
Re-initialize register configuration when the chip is idle for higher stability.
For controlling GPIO2 ,GPIO3 externally，pin status is as follows：
In tx mode：GPIO2 = 0; GPIO3 = 1;
In rx mode：GPIO2 = 1; GPIO3 = 0;
If the SI4438 is required to control itself, the mode of the configuration pins can be as follows when
the program is initialized:
SI44XX_GPIO_CONFIG( 0, 0, 32|0x40, 33|0x40, 0, 0, 0 );

Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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5 Basic application
5.1 Basic circuit diagram
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

Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MS User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
9
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;
7 Production 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℃
Aveage ramp-down rate（Tp to Tsmax）
Aveage ramp-down rate
6℃/second max
6℃/second max
Time 25℃ to peak temperature
Time to peak temperature for
25℃
max 6 minutes
max 8 minutes