Ebyte E32-900T30D User manual

E32-900T30D User Manual
SX1276 868MHz/915MHz DIP Wireless Module

Chengdu Ebyte Electronic Technology Co., Ltd E32-900T30D User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 1
Contents
DISCLAIMER......................................................................................................................................3
FEATURES............................................................................................................................................................................4
1.OVERVIEW.......................................................................................................................................5
1.1 INTRODUCTION..............................................................................................................................................................5
2.SPECIFICATION AND PARAMETER......................................................................................... 5
2.1 LIMIT PARAMETER......................................................................................................................................................... 5
2.2 OPERATING PARAMETER................................................................................................................................................ 6
3 SIZE AND PIN DEFINITION.........................................................................................................7
4 CONNECT TO MCU........................................................................................................................8
5 FUNCTION DESCRIPTION...........................................................................................................9
5.1 FIXED TRANSMISSION....................................................................................................................................................9
5.2 BROADCASTING TRANSMISSION.................................................................................................................................... 9
5.3 BROADCASTING ADDRESS............................................................................................................................................. 9
5.4 MONITOR ADDRESS..................................................................................................................................................... 10
5.5 RESET..........................................................................................................................................................................10
5.6 AUX DESCRIPTION...................................................................................................................................................... 10
5.6.1 Indication of UART output................................................................................................................................... 10
5.6.2 Indication of wireless transmitting...................................................................................................................... 11
5.6.3 Configuration procedure of module..................................................................................................................... 11
5.6.4 Notes for AUX...................................................................................................................................................... 11
6 OPERATING MODE.....................................................................................................................12
6.1 MODE SWITCH.............................................................................................................................................................12
6.2 NORMAL MODE (MODE 0)........................................................................................................................................... 13
6.3 WAKE-UP MODE (MODE 1)...........................................................................................................................................13
6.4 POWER-SAVING MODE (MODE 2)................................................................................................................................. 14
6.5 SLEEP MODE (MODE 3)................................................................................................................................................ 14
7 COMMAND FORMAT..................................................................................................................14
7.1 DEFAULT PARAMETERS................................................................................................................................................ 15
7.2 READING OPERATING PARAMETERS.............................................................................................................................15

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7.3 READING VERSION NUMBER........................................................................................................................................15
7.4 RESET COMMAND........................................................................................................................................................15
7.5 PARAMETER SETTING COMMAND................................................................................................................................ 15
8 BASIC OPERATION..................................................................................................................... 17
8.1 HARDWARE DESIGN.....................................................................................................................................................17
9 FAQ.................................................................................................................................................. 18
9.1 COMMUNICATION RANGE IS TOO SHORT......................................................................................................................18
9.2 MODULE IS EASY TO DAMAGE.....................................................................................................................................19
9.3 BER(BIT ERROR RATE)IS HIGH..................................................................................................................................19
10 PRODUCTION GUIDANCE...................................................................................................... 19
10.1 REFLOW SOLDERING TEMPERATURE..........................................................................................................................19
10.2 REFLOW SOLDERING CURVE......................................................................................................................................20
REVISION HISTORY...................................................................................................................... 20
ABOUT US......................................................................................................................................... 20

Chengdu Ebyte Electronic Technology Co., Ltd E32-900T30D 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.

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Features
Advanced LoRa modulation, with the advantage of long-distance anti-interference;
Under ideal conditions, the communication distance can reach 8km, and the transmission distance is better than
traditional GFSK;
Fixed-point transmission, broadcast transmission, channel monitoring;
FEC forward error correction to improve communication stability;
Air wake-up (ultra-low power consumption), suitable for battery applications;
Adopt industrial-grade active temperature-compensated crystal oscillator to ensure its stability and consistency;
The maximum transmit power is 30dBm, and the software is multi-level adjustable；
Support 868/915MHz EU general frequency band;
The data transmission rate of 0.3k～19.2kbps;
3.3~5.5V power supply, power supply greater than 3.3V can guarantee the best performance;
Industrial-grade standard design, supporting long-term use at -40～+85℃;
IPEX/stamp hole interface for easy connection of coaxial cable or external antenna.

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1. Overview
1.1 Introduction
E32-900T30D is a wireless serial port module (UART) based
on SEMTECH’s SX1276 RF chip. It has multiple transmission
modes, working in the 862MHz~931MHz, LoRa spread spectrum
technology, TTL output.
SX1276 features LoRa™,which will bring longer
communication distance, and has the advantages of concentrated
power density, meanwhile it has a very strong confidentiality.The
modules of 30dBm transmitting power adopt industrial grade
crystal oscillators to ensure the stability and consistency with air data rate 2.4kps. It is widely applied in utility meters,
IoT renovation, smart home, etc. The modules feature data encryption and compression.
E32-900T30D strictly follows design standards of FCC, CE, CCC and meets various RF certification requirements
for exporting.
1.2 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.
2. Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remarks
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

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2.2 Operating parameter
Main parameter
Performance
Remark
Min
Typ.
Max.
Operating voltage（V）
3.3
5.0
5.5
≥5.5 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）
862
868
931
Support ISM band
Power
consumpti
on
Transmitting current [mA]
650
Instant power consumption
Receiving current [mA]
25
Turn-off current [μA]
5
Software is shut down
Max Tx power（dBm）
30
Receiving sensitivity（dBm）
-145
-147
-148
Air data rate is 2.4kbps
Main parameter
Description
Remark
Distance for reference
8km
Test condition：clear and open area, antenna gain: 5dBi，
antenna height: 2.5m，air data rate: 2.4kbps
TX length
58 Byte
Maximum capacity of single package, automatic
sub-packing after exceeding.
Buffer
512 Byte
Modulation
LoRa™
Communication interface
TTL
@3.3V
Package
DIP
Connector
DIP
1*7*2.54mm spacing
Size
24* 43 mm
Antenna
SMA-K
50 ohm impedance

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3 Size and pin definition
No.
Name
Direction
Function
1
M0
Input
（weak pull-up）
With M1, the four working modes of the module can be determined (it
cannot be suspended, and it can be grounded if it is not used).
2
M1
Input
（weak pull-up）
With M0, the four working modes of the module can be determined (it
cannot be suspended, and it can be grounded if it is not used).
3
RXD
Input
TTL UART input ,Connect to external TXD output pins; Can be configured
as drain open circuit or pull up input, see parameter Settings
4
TXD
Output
TTL UART output, Connect to external RXD input pin; Can be configured as
drain open circuit or push - pull output, see parameter Settings
5
AUX
Output
Used to indicate the working status of the module; The user wakes up the
external MCU and outputs low level during self-test initialization; Can be
configured as drain open output, or push-pull output, see parameter Settings
(can be suspended)
6
VCC
Input
Positive reference of module power supply, voltage range: 3.3v ~ 5.5V DC

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7
GND
Input
Ground
8
Fix hole
9
Fix hole
10
Fix hole
4 Connect to MCU
No.
Description（STM8L MCU）
1
The UART module is TTL level.
2
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.

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5 Function description
5.1 Fixed transmission
5.2 Broadcasting transmission
5.3 Broadcasting address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;

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When module is the transmitter (transparent transmission), all modules under channel 0x04 will receive the data, the
purpose of broadcast is realized.
5.4 Monitor address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
When module A is the receiver, it can receive the data sent from all modules under channel 0x04, the purpose of
monitor is realized.
5.5 Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the
operating mode based on user’s parameters. During the process, the AUX remains low level. After the process
completed, the AUX outputs high level and starts to work as per the operating mode combined by M1 and M0.
Therefore, users need to wait the AUX rising edge as the start of module’s normal work.
5.6 AUX description
AUX Pin can be used as indication for wireless send & receive buffer and self-check.
It can indicate whether there are data that are not sent yet via wireless way, or whether all wireless data has been
sent through UART, or whether the module is still in the process of self-check initialization.
5.6.1 Indication of UART output
To wake up external MCU

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5.6.2 Indication of wireless transmitting
Buffer (empty): the internal 512 bytes data in the buffer are written to the RFIC (Auto sub-packaging).
When AUX=1, the user can input data less than 512 bytes continuously without overflow. Buffer (not empty): when
AUX=0, the internal 512 bytes data in the buffer have not been written to the RFIC completely. If the user starts to
transmit data at this circumstance, it may cause overtime when the module is waiting for the user data, or
transmitting wireless sub package.
When AUX = 1, it does not mean that all the UART data of the module have been transmitted already, perhaps the
last packet of data is still in transmission.
5.6.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode
5.6.4 Notes for AUX
No.
Description

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1
For function 1 & function 2 mentioned above, the priority should be given to the one with low level output, which means if
it meets each of any low level output condition, AUX outputs low level, if none of the low level condition is met, AUX
outputs high level.
2
When AUX outputs low level, it means the module is busy & cannot conduct operating mode checking. Within 1ms since
AUX outputs high level, the mode switch will be completed.
3
After switching to new operating mode, it will not work in the new mode immediately until AUX rising edge lasts for
2ms . If AUX stays on the high level, the operating mode switch can be affected immediately.
4
When the user switches to other operating modes from mode 3 (sleep mode) or it’s still in reset process, the module will
reset user parameters, during which AUX outputs low level.
6 Operating mode
There are four operating modes, which are set by M1 and M0, the details are as follows:
Mode（0-3）
M0
M1
Mode introduction
Remark
0 Normal
0
0
UART and wireless channel are open, transparent
transmission is on
The receiver must work in
mode 0 or mode 1
1 Wake up
1
0
UART and wireless channel are open, the only
difference with mode 0 is that before transmitting data,
increasing the wake up code automatically, so that it can
awake the receiver under mode 3.
The receiver could be 0,1 or 2
2 Power
saving
0
1
UART close, wireless is under air-awaken mode, after
receiving data, UART open and send data.
Transmitter must be mode 1,
unable to transmit in this
mode.
3 Sleep
1
1
sleep mode, receiving parameter setting command is
available.
More details on parameter
specification.
6.1 Mode switch
The user can decide the operating mode by the combination of M1 and M0. The two GPIO of MCU can be used to
switch mode. After modifying M1 or M0, it will start to work in new mode 1ms later if the module is free. If there
are any serial data that are yet to finish wireless transmitting, it will start to work in new mode after the UART
transmitting finished. After the module receives the wireless data & transmits the data through serial port, it will
start to work in new mode after the transmitting finished. Therefore, the mode-switch is only valid when AUX
outputs 1, otherwise it will delay.
For example, in mode 0 or mode 1, if the user inputs massive data consecutively and switches operating mode at the
same time, the mode-switch operation is invalid. New mode checking can only be started after all the user’s data
process completed. It is recommended to check AUX pin out status and wait 2ms after AUX outputs high level
before switching the mode.
If the module switches from other modes to stand-by mode, it will work in stand-by mode only after all the
remained data process completed. The feature can be used to save power consumption. For example, when the
transmitter works in mode 0, after the external MCU transmits data “12345”, it can switch to sleep mode
immediately without waiting the rising edge of the AUX pin, also the user’s main MCU will go dormancy

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immediately. Then the module will transmit all the data through wireless transmission & go dormancy 1ms later
automatically, which reduces MCU working time & save power.
Likewise, this feature can be used in any mode-switch. The module will start to work in new mode within 1ms after
completing present mode task, which enables the user to omit the procedure of AUX inquiry and switch mode
swiftly. For example, when switching from transmitting mode to receiving mode, the user MCU can go dormancy
before mode-switch, using external interrupt function to get AUX change so that the mode-switch can be realized.
This operation is very flexible and efficient. It is totally designed on the basis of the user MCU’s convenience, at the
same time the work load and power consumption of the whole system have been reduced and the efficiency of
whole system is largely improved.
6.2 Normal mode (mode 0)
When M1 = 0 & M0 = 0, module works in mode 0
Transmitting
The module can receive the user data via serial port, and transmit wireless data package of 58 bytes. When the data
inputted by user is up to 58 byte, the module will start wireless transmission. During which the user can input data
continuously for transmission.
When the required transmission bytes are less than 58 bytes, the module will wait 3-byte time and treat it as data
termination unless continuous data inputted by user. Then the module will transmit all the data through wireless
channel.
When the module receives the first data packet from user, the AUX outputs low level.
After all the data are transmitted into RF chip and transmission start , AUX outputs high level.
At this time, it means that the last wireless data package transmission is started, which enables the user to input another
512 bytes continuously. The data package transmitted from the module working in mode 0 can only be received by the
module working in mode 0 or 1.
Receiving
The wireless receiving function of the module is on, the data packet transmitted from the module working in mode 0 &
mode 1 can be received.
After the data packet is received, the AUX outputs low level, 5ms later the module starts to transmit wireless data
through serial port TXD pin.
After all the wireless data have been transmitted via serial port, the AUX outputs high level.
6.3 Wake-up mode (mode 1)
When M1 = 0 & M0 = 1, module works in mode 1
Transmitting
The condition of data packet transmission & AUX function is the same as mode 0. The only difference is that the
module will add preamble code before each data packet automatically. The preamble code length depends on the
wake-up time set in the user parameters. The purpose of the preamble code is waking up the receiving module
works in mode 2. Therefore, the data package transmitted from mode 1 can be received by mode 0, mode1 and
mode 2.
Receiving
The same as that in mode 0.

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6.4 Power-saving mode (mode 2)
When M1 = 1 & M0 = 0, module works in mode 2
Transmitting
UART is closed, the module cannot receive any serial port data from outside MCU.
Hence the function of wireless transmission is not available for the module working in this mode.
Receiving
In mode 2, it is required the data transmitter works in mode 1.
The wireless module monitors the preamble code at regular time.
Once it gets the preamble code, it will remain as receiving status and waiting for the completion of receiving the
entire valid data package.
Then the AUX outputs low level, 5ms later the serial port is open to transmit received wireless data through TXD.
Finally, AUX outputs high level after process completed.
The wireless module stays in “power-saving – monitoring” working status (polling).
By setting different wake-up time, the module will have different receiving response delay (2s in maximum) and
average power consumption (30uA in minimum).
The user needs to achieve a balance between communication delay time & average power consumption.
6.5 Sleep mode (mode 3)
When M1=1, M0=1, module works in mode 3
Transmitting
N/A
Receiving
N/A
Parameter
setting
This mode can be used for parameter setting. It uses serial port 9600 & 8N1 to set module working parameters through
specific instruction format. (pls refer to parameters setting for details)
Notes
When the mode changes from stand-by mode to others, the module will reset its parameters, during which the AUX
keeps low level and then outputs high level after reset completed. It is recommended to check the AUX rising edge for
user.
7 Command format
In sleep mode（Mode 3：M1=1, M0=1）, it supports below instructions on list.
(Only support 9600 and 8N1 format when setting)
No.
Instruction
format
Illustration
1
C0+working
parameters
C0 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in total and
must be sent in succession, ( Save the parameters when power-down ).
2
C1+C1+C1
( Save the parameters when power-down )
3
C2+working
parameters
Three C1 are sent in hexadecimal format. The module returns the saved parameters and
must be sent in succession.
4
C3+C3+C3
C2 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in total and
must be sent in succession. ( Do not save the parameters when power-down )
5
C4+C4+C4
Three C3 are sent in hexadecimal format. The module returns the version information
and they must be sent in succession.

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7.1 Default parameters
Default parameter values：：C0 00 00 1A 17 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting power
E32-900T30D
868MHz
0x0000
0x06
2.4kbps
9600
8N1
1W
7.2 Reading operating parameters
Instruction format
Description
C1+C1+C1
In sleep mode（M0=1，M1=1），
User gives the module instruction (HEX format): C1 C1 C1,
Module returns the present configuration parameters.
For example, C0 00 00 1A 17 44.
7.3 Reading version number
Instruction format
Description
C3+C3+C3
In sleep mode
（M0=1，
M1=1） ,User gives the module instruction (HEX format): C3 C3 C3,Module
returns its present version number, for example C3 00 45 0A 14 0B XX YY. The third bytes means
frequency. 45 here means frequency 900MHZ, 0x14 means 20dBm power; xx is the version
number and yy refers to the other module features.
7.4 Reset command
Instruction format
Description
C4+C4+C4
In sleep mode（M0=1，M1=1）,
User gives the module instruction (HEX format): C4 C4 C4, the module resets for one time.
During the reset process, the module will conduct self-check, AUX outputs low level. After reset
completing, the AUX outputs high level, then the module starts to work regularly which the
working mode can be switched or be given another instruction.
7.5 Parameter setting command
No.
Item
Description
Remark
0
HEAD
Fix 0xC0 or 0xC2, it means this frame data is control command
Must be 0xC0 or 0xC2
C0: Save the parameters when power-down
C2: Do not save the parameters when
power-down
1
ADDH
High address byte of module
（the default 00H）
00H-FFH

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2
ADDL
Low address byte of module
（the default 00H）
00H-FFH
3
SPED
7
6
UART parity bit
UART mode can be different between
communication parties
0
0
8N1 (default)
0
1
8O1
1
0
8 E1
1
1
8N1 (equal to 00)
5
4
3
TTL UART baud rate（bps）
UART baud rate can be different between
communication parties
The UART baud rate has nothing to do
with wireless transmission parameters &
won’t affect the wireless transmit / receive
features.
0
0
0
1200
0
0
1
2400
0
1
0
4800
0
1
1
9600 (default)
1
0
0
19200
1
0
1
38400
1
1
0
57600
1
1
1
115200
2
1
0
Air data rate（bps）
The lower the air data rate, the longer the
transmitting distance, better
anti-interference performance and longer
transmitting time
The air data rate must keep the same for
both communication parties.
0
0
0
0.3k
0
0
1
1.2k
0
1
0
2.4k (default)
0
1
1
4.8k
1
0
0
9.6k
1
0
1
19.2k
1
1
0
19.2k (same to 101)
1
1
1
19.2k (same to 101)
General Specifications
4
CHAN
7
6
5
reserved
Write 0
Communication channel
00H-45H, correspond to 862~931MHz
4-0, channel (862M + CHAN*1M), default 06H（868MHz）
5
OPTI
ON
7
Fixed transmission enabling bit（similar to MODBUS）
In fixed transmission mode, the first three
bytes of each user's data frame can be used
as high/low address and channel. The
module changes its address and channel
when transmit. And it will revert to
original setting after complete the process.
0
Transparent transmission mode
1
Fixed transmission mode
6
IO drive mode (default 1)
This bit is used to the module internal
pull-up resistor. It also increases the
level’s adaptability in case of open drain.
But in some cases, it may need external
pull-up resistor.
1
TXD and AUX push-pull outputs, RXD pull-up inputs
0
TXD、AUX open-collector outputs, RXD open-collector
inputs

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5
4
3
wireless wake-up time
The transmit & receive module work in
mode 0, whose delay time is invalid & can
be arbitrary value.
The transmitter works in mode 1 can
transmit the preamble code of the
corresponding time continuously.
When the receiver works in mode 2, the
time means the monitor interval time
(wireless wake-up). Only the data from
transmitter that works in mode 1 can be
received.
0
0
0
250ms (default)
0
0
1
500ms
0
1
0
750ms
0
1
1
1000ms
1
0
0
1250ms
1
0
1
1500ms
1
1
0
1750ms
1
1
1
2000ms
2
FEC switch
After turn off FEC, the actual data
transmission rate increases while
anti-interference ability decreases. Also the
transmission distance is relatively short.
Both communication parties must keep on
the same pages about turn-on or turn-off
FEC.
0
Turn off FEC
1
Turn on FEC (default)
1
0
Transmission power (approximation)
The external power must make sure the
ability of current output more than 1A and
ensure the power supply ripple within 100mV.
Low power transmission is not
recommended due to its low power supply
efficiency.
0
0
30dBm (default)
0
1
27dBm
1
0
24dBm
1
1
21dBm
For example: The meaning of No.3 "SPED" byte:
The binary bit of the byte
7
6
5
4
3
2
1
0
Configures by user
0
0
0
1
1
0
1
0
Meaning
UART parity bit 8N1
UART baud rate is 9600
Air data rate is 2.4k
Corresponding hexadecimal
1
A
Note: When the module communicates with other E32 modules, pay attention to the communication channel to be
consistent. For example, the starting frequency of the E32 915 series is 900Mhz. To communicate with this module, the
value of the register (CHAN) numbered 4 should be 0x35.
8 Basic operation
8.1 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.；

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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
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.
9 FAQ
9.1 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).

Chengdu Ebyte Electronic Technology Co., Ltd E32-900T30D User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 19
The power supply low voltage under room temperature is lower than recommended value, the lower the voltage, the
lower the transmitting power.
Due to antenna quality or poor matching between antenna and module.
9.2 Module is easy to damage
Please check the power supply source, ensure it is in right range.
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.
9.3 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;
10 Production guidance
10.1 Reflow soldering temperature
Profile Feature
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）
100℃
150℃
Preheat temperature max (Tsmax)
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
3℃/second max
3℃/second max
Liquidous Temperature (TL)
183℃
217℃
Time（tL）Maintained Above（TL）
60-90 sec
30-90 sec
Peak temperature（Tp）
220-235℃
230-250℃
Average ramp-down rate（Tp to Tsmax）
6℃/second max
6℃/second max
Time 25℃ to peak temperature
max 6 minutes
max 8 minutes