Ebyte E103-W20 User manual

User Manual
E103-W20 WIFI Module
Based on MediaTek MT7688AN/ MT7628AN

Chengdu Ebyte Electronic Technology Co., Ltd. E103-W02 User Manual
Copyright © 2012–20 2 2 , Chengdu Ebyte Electronic Technology Co., Ltd.
1
Contents
1 Overview .............................................................................................................................................................................3
1.1 Product introduction ................................................................................................................................................. 3
1.2 Features .................................................................................................................................................................... 3
1.3 Application scenarios ............................................................................................................................................... 4
2 Specifications ..................................................................................................................................................................... 4
2.1 Radio Frequency parameters .................................................................................................................................... 4
2.2 Electrical parameters ................................................................................................................................................ 4
2.3 Hardware parameters ................................................................................................................................................5
3 Mechanical Dimensions and Pin Definition .................................................................................................................... 6
Figure 1 : Dimensions of E103-W20(7688) ...................................................................................................................6
Figure 2 : Dimensions of E103-W20(7628) ...................................................................................................................7
4 WiFi Protocol Features ................................................................................................................................................... 10
4.1 802.11b 11M .......................................................................................................................................................... 10
4.2 802.11g 54M .......................................................................................................................................................... 10
4.3 802.11n MCS7(HT20) ........................................................................................................................................... 11
4.4 802.11n_MCS7(HT40) .......................................................................................................................................... 11
5 Mechanical Dimensions and Pin Definition .................................................................................................................. 12
5.1 Acquisition and compilation of secondary development SDK .............................................................................. 12
5.2 Firmware burning ...................................................................................................................................................15
6 Frequently Asked Questions .......................................................................................................................................... 18
6.1 The transmission distance is not ideal ....................................................................................................................18
6.2 Modules are easily damaged .................................................................................................................................. 18
7 Welding Operation Instructions .................................................................................................................................... 19
7.1 Reflow soldering temperature ................................................................................................................................ 19
7.2 Reflow soldering profile .........................................................................................................................................20
8 Antenna Options ..............................................................................................................................................................20
9 Packing details ................................................................................................................................................................. 21
Revision History ................................................................................................................................................................. 22
About us .............................................................................................................................................................................. 22

Chengdu Ebyte Electronic Technology Co., Ltd. E103-W02 User Manual
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Disclaimer and Copyright Notice
Information in this document, including URL addresses for reference, is subject to change without
notice. Documentation is provided "as is" without warranty of any kind, including any warranties of
merchantability, fitness for a particular purpose, or non-infringement, and any warranties referred to
elsewhere in any proposal, specification or sample. No responsibility is assumed in this document,
including any liability for infringement of any patent rights arising out of the use of the information
in this document. This document does not hereby grant, by estoppel or otherwise, any license,
express or implied, to use any intellectual property rights.
The test data obtained in this article are all obtained by the Ebyte laboratory test, and the actual
results may be slightly different. All trade names, trademarks and registered trademarks mentioned
herein are the property of their respective owners and are hereby acknowledged.
Ebyte Electronic Technology Co., Ltd.
Note :
Due to product version upgrade or other reasons, the contents of this manual may be changed. Ebyte Electronic
Technology Co., Ltd. reserves the right to modify the contents of this manual without any notice or prompt. This
manual is only used as a guide . Chengdu Ebyte Electronic Technology Co., Ltd. does its best to provide accurate
information in this manual. However, Chengdu Ebyte Electronic Technology Co., Ltd. does not ensure that the
contents of the manual are completely error-free. All statements in this manual , information and advice do not
create any express or implied warranties.

Chengdu Ebyte Electronic Technology Co., Ltd. E103-W02 User Manual
Copyright © 2012–20 2 2 , Chengdu Ebyte Electronic Technology Co., Ltd.
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1 Overview
1.1 Product introduction
The E103-W20(7688) and E103-W20(7628) modules are low-cost and low-power IoT modules
based on MediaTek MT7688AN and MT7628AN. This module brings out all the interfaces of
MT7688AN/MT7628AN, supports OpenWrt operating systems and custom development, has rich
interfaces and powerful processors, can be widely used in smart devices or cloud service applications,
etc., and can freely perform two secondary development.
E103-W20(7688) E103-W20(7628)
1.2 Features
Super data processing capability, MCU main frequency up to 580MHz
150M wireless speed
Support 802.11b/g/n mode
20/40 channel bandwidth
802.11v support
Support AP,STA and AP,STA mixed mode
5 10/100M adaptive network ports
1 USB2.0 host interface
Multiple interfacesSPI/SD-XC/eMMC
Rich peripheral interfaces, SPI, I2C, I2S, UART, JTAG, GPIO
Widely used in the Internet of Things
Built-in powerful PMU
Supports 16 Multiple BSSIDs
Support multiple encryption methods WEP64/128, TKIP, AES, WPA, WPA2, WAPI
Support QoS, WMM, WMM-PS
Support OpenWrt 14.07 version for secondary development.

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1.3 Application scenarios
wifi video transmission
wifi audio transmission
router
wifi repeater
Serial port forwarding and other smart home universal modules
Cloud service application
IoT Gateway
2 Specifications
2.1 Radio Frequency parameters
RF parameters
unit
Model
Remark
E103-W20(7688)
E103-W20(7628)
transmit power
dBm
20～24
WiFi protocol
-
IEEE 802.11b/g/n
Ideal Range
Meter
200
Antenna gain 5dBi , in a line of sight
main frequency
MB
580
2.2 Electrical parameters
Electrical parameters
unit
model
Remark
E103-W20(7688)
E103-W20(7628)
working voltage
V
3.3±0.2V
Voltage over 3.5 V will permanently burn
the module
communication level
V
3.3
Voltage over 3.5 V will permanently burn
the module
No-load running current
mA
180±50
Average power consumption
Supply Current Requirements
mA
≥1000
temperature
Operating
temperature
°C
-20 to +5 5 _
Industrial grade
Storage
temperature
-40 to +8 5
humidity
use
%RH
10 to 95(non-condensing)
storage
5～95(non-condensing)

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2.3 Hardware parameters
Hardware parameters
model
Remark
E103-W20(7688)
E103-W20(7628)
chip
MT7688AN
MT7628AN
Flash
32MB
Customizable 16MB/8MB
Memory
DDR2 128MB
Customizable DDR2 256M/64M/32MB
kernel
MIPS24KEc
Packaging method
patch
Antenna interface
IPEX×1
（1T2R 2.4 GHz with
150Mbps PHY data
rate）
IPEX×2
（2T2R 2.4 GHz with
300Mbps PHY data
rate）
Characteristic impedance about 50 ohms
interface
Ethernet
interface
5 10M/100M adaptive
Interfaces supported by factory default firmware 1
WAN, 4 LAN .
UART
3 way
The interfaces supported by the firmware are 2-way
UART with transparent transmission function .
SDIO
1 way
Firmware interface not supported
SPI
1 way
Firmware interface not supported
I2C
1 way
Firmware interface not supported
I2S
1 way
Firmware interface not supported
PWM
1 way
Firmware interface not supported
GPIO
8 or more
Firmware Supported Interfaces Defined Functions
size
34.1*18.7*2.7mm
36.1*18.7*2.7mm
The error size is ±0.1mm
Note: 1. The default firmware of the module is the firmware developed by our company based on Linux; Ethernet, WiFi, UART0 and
UART1 of this firmware have transparent transmission function;
2. The OPENWRT program or the original MTK Linux program can be programmed according to the actual usage.

Chengdu Ebyte Electronic Technology Co., Ltd. E103-W02 User Manual
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3 Mechanical Dimensions and Pin Definition
Figure 1 : Dimensions of E103-W20(7688)

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Figure 2 : Dimensions of E103-W20(7628)
No
pin name
pin type
Pin function description
function by default
1
MDI_RP_P0
I/O
PORT0 network signal receiving positive
WAN port, please leave it empty
2
MDI_RN_P
0
I/O
PORT0 network signal receive negative
3
MDI_TP_P0
I/O
PORT0 network signal sending is
positive
4
MDI_TN_P
0
I/O
PORT0 network signal sending negative
5
MDI_TP_P1
I/O
PORT0 network signal sending is
positive
LAN1 port, please leave it empty
6
MDI_TN_P
1
I/O
PORT1 network signal sending negative
7
MDI_RP_P1
I/O
PORT1 network signal receiving positive
8
MDI_RN_P
I/O
PORT1 network signal receive negative

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1
9
MDI_RP_P2
I/O
PORT2 network signal reception is
positive
LAN2 port, please leave it empty
10
MDI_RN_P
2
I/O
PORT2 network signal receive negative
11
MDI_TP_P2
I/O
PORT2 network signal sending is
positive
12
MDI_TN_P
2
I/O
PORT2 network signal send negative
13
MDI_TP_P3
I/O
PORT3 network signal sending is
positive
LAN3 port, please leave it empty
14
MDI_TN_P
3
I/O
PORT3 network signal send negative
15
MDI_RP_P3
I/O
PORT3 network signal reception is
positive
16
MDI_RN_P
3
I/O
PORT3 network signal receive negative
17
MDI_RP_P4
I/O
PORT4 network signal reception is
positive
LAN4 port, please leave it empty
18
MDI_RN_P
4
I/O
PORT4 network signal receive negative
19
MDI_TP_P4
I/O
PORT4 network signal sending is
positive
20
MDI_TN_P
4
I/O
PORT4 network signal send negative
twenty
one
USB_DP
I/O
USB data positive
undefined, please leave blank
twenty
two
USB_DM
I/O
USB data negative
undefined, please leave blank
twenty
three
GND
P
land
ground
twenty
four
GND
P
land
System power supply( it is recommended to
increase the capacitor at the power supply end )
25
3.3VD
P
3.3V input, recommended supply
current >=1000mA
26
3.3VD
P
27
GND
P
land
28
SPI_CS0
I/O
SPI bus chip select signal 0
undefined, please leave blank
29
REF_CLKO
I/O
Reference clock output
undefined, please leave blank
30
PERST_N
I/O
PCIe device reset output
Undefined, please leave it in the air, cannot be
pulled down
31
WDT_RST_
N
I/O
watchdog timeout reset
32
EPHY_LED
4
I/O
PORT4 LED active low
LAN4 network port light
33
EPHY_LED
3
I/O
PORT3 LED active low
LAN3 network port light

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34
EPHY_LED
2
I/O
PORT2 LED active low
LAN2 network port light
35
EPHY_LED
1
I/O
PORT1 LED active low
LAN1 network port light
36
EPHY_LED
0
I/O
PORT0 LED active low
WAN port light
37
PORT_N
I/O
CPU reset, active low
Reset input, please leave it open
38
UART_TXD
1
O
Serial port 1 data transmission
Serial port 1 output, please leave it in the air if it is
not used, and cannot be pulled down
39
UART_RXD
1
I
Serial port 1 data reception
Serial port 1 input, please leave it in the air
40
I2S_SDI
I/O
I2S data input
undefined, please leave blank
41
I2S_SDO
I/O
I2S data output
Undefined, please leave it in the air, cannot be
pulled up
42
I2S_WS
I/O
I2S channel selection, 0: left, 1: right
undefined, please leave blank
43
I2S_CLK
I/O
I2S data bit clock
undefined, please leave blank
44
GND
P
land
ground
45
ANT
P
Antenna RF interface, not connected by
default
If you need to connect this pin, you need to remove
the antenna base and replace it with a 0 ohm
resistor
46
GND
P
land
ground
47
I2C_SCLK
I/O
I2C bus clock
undefined, please leave blank
48
I2C_SD
I/O
I2C bus data
undefined, please leave blank
49
SPI_CS1
I/O
SPI chip select signal 1
undefined, please leave blank
50
SPI_CLK
I/O
SPI clock signal
Undefined, please leave it in the air, cannot be
pulled up
51
SPI_MISO
I/O
SPI bus data master input slave output
Undefined, please leave it in the air, cannot be
pulled down
52
SPI_MOSI
I/O
SPI bus data master out slave in
Undefined, please leave it in the air, cannot be
pulled up
53
GPIO0
I/O
General purpose input and output
interface
undefined, please leave blank
54
UART_TXD
0
O
Serial port 0 data output
Serial port 0 output, please leave it in the air, do not
pull up
55
UART_RXD
0
I
Serial 0 data input
Serial port 0 input, please leave it in the air
56
WLED_N
I/O
WIFI LED, active low
When there is a WIFI signal, the WIFI LED flashes
and can be left floating
Note: I-input; O-output; I/O-digital I/O; P-power. IO port drive current 8mA.

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4 WiFi Protocol Features
4.1 802.11b 11M
802.11b Transmit(Conductive)
Item
Condition
Min.
Typ.
Max.
Unit
Frequency Range
Channel 1
Channel 13
Tx Power Level
DQPS
K
18
20
twenty two
dBm
Frequency Tolerance
-15
0
15
ppm
Spectral Mask
11MHz→22MHz
40
dBr
>22MHz
53
dBr
Modulation Accuracy
All Data Rate
15
%
802.11b Receiver(Conductive)
Item
Condition
Min.
Typ.
Max.
Unit
Frequency Range
Channel 1
Channel 13
Min. Input
11Mbps PER<8%
-91.5
-89.5
-87.5
dBm
4.2 802.11g 54M
802.11g Transmit(Conductive)
Item
Condition
Min.
Typ.
Max.
Unit
Frequency Range
Channel 1
Channel 13
Tx Power Level
OFD
M
15
17
19
dBm
Frequency Tolerance
-15
0
15
ppm
Modulation Accuracy
All Data Rate
-31
-28
%
802.11g Receiver(Conductive)
Item
Condition
Min.
Typ.
Max.
Unit
Frequency Range
Channel 1
Channel 13
Min. Input
54Mbps PER<10%
-78.0
-76.0
-74.0
dBm

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4.3 802.11n MCS7(HT20)
802.11n_HT20 Transmit(Conductive)
Item
Condition
Min.
Typ.
Max.
Unit
Frequency Range
Channel 1
Channel 13
Tx Power Level
OFDM
15
17
19
dBm
Frequency Tolerance
-15
0
15
ppm
Modulation Accuracy
All Data Rate
-31
-28
dB
802.11n_HT20 Receiver(Conductive)
Item
Condition
Min.
Typ.
Max.
Unit
Frequency Range
Channel 1
Channel 13
Min. Input
MCS7
PER<10%
-76.5
-74.5
-72.5
dBm
4.4 802.11n_MCS7(HT40)
802.11n_HT40 Transmit(Conductive)
project
condition
minimum
Typical
maximum
unit
Frequency Range
Channel 1
Channel 13
Tx Power Level
OFDM
15.0
17.0
19.0
dBm
Frequency Tolerance
-15
0
15
ppm
Modulation Accuracy
All Data Rate
-31
-28
dB
802.11n_HT40 Receiver(Conductive)
Item
Condition
Min.
Typ.
Max.
Unit
Frequency Range
Channel 1
Channel 13
Min. Input
MCS7
PER<10%
-76.5
-74.5
-72.5
dBm

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5 Mechanical Dimensions and Pin Definition
5.1 Acquisition and compilation of secondary development SDK
The module is factory-burned with the basic firmware of openwrt version 14.07. We provide this version of the openwrt
SDK for developers to use. Since compiling the source code needs to download some foreign packages, it is easy to make
mistakes during the compiling process, and there may be some environmental problems, so we provide the configured
source code in the form of a virtual machine image, and the compilation can be successful directly.
（1）Compile the virtual machine on Baidu network disk(using vmware virtual machine)
Link: https://pan.baidu.com/s/1V-HEIY1E2oa41sJcs6Gbgw?pwd=ct04
Extraction code: ct04
（2）After downloading, there are two compressed files in 7zip format. After selecting these two files, use 7zip to
extract them to the current location.
(3) Use vmware to open ubuntu
Virtual machine username: luke password: luke
Virtual machine version 14.1.1
(4) When opening the virtual machine, the mouse may not be available. You can set it in vmware's
Edit->Preferences->Input->Mouse Optimized for Games to always

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(5) The source code of Mtk Openwrt comes with the virtual machine, /home/luke/MtkOpenwrt, which already has
the default configuration and can be compiled directly
luke@ub:~$ cd MtkOpenwrt
luke@ub:~$ make V=s
(6) Openwrt configuration compilation
There is already a default configuration in the SDK, which meets the basic functions of routing. Customers can
also customize the configuration according to their own needs.
Command: make menuconfig

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The WIFI driver is configured under MTK Properties-> Drivers --->kmod-mt7628
If you need STA function, you can choose: AP-Client Support
Notice:
Kmod-mt7628sta cannot be used, please do not select it, if you need sta function, please select ap-client support under
kmod-mt7628 driver
Use the command make V= s
The compilation results are saved in the bin/ramips/ directory
Generate firmware name: openwrt-ramips-mt7628-mt7628-squashfs-sysupgrade.bin

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5.2 Firmware burning
(1) Burn through the openwrt web page
①After the module is powered on, connect to the module's wifi, and then enter 192.168.10.1 in the browser to enter
the openwrt web configuration interface
②Enter the password root to log in, then enter the System-->Backup/Flash Firmware option, and select the file to
be updated at the Flash new firmware image.
③After selecting, click Flash image
④Enter the verification, click proceed to start burning

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⑤Wait about a minute or so, the module indicator lights up and the programming is complete
(2) Use uboot to burn
Using uboot to burn requires the module to be connected to the network cable, and the module and the computer are
in the same network segment
①When the development board is powered on, enter "6" to enter the web page to burn
②Enter the IP address in the above picture in the browser, you can jump to the burning interface; here you can
choose to burn uboot, openwrt firmware, factory parameters

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③Here is an example of upgrading openwrt, first select the bin file we need to burn, then click update firmware to
start the upgrade , and close the webpage after the upgrade.

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6 Frequently Asked Questions
6.1 The transmission distance is not ideal
When there is a straight-line communication obstacle, the communication distance will be correspondingly attenuated;
Temperature, humidity, and co-channel interference will increase the communication packet loss rate;
The ground absorbs and reflects radio waves, and the test effect close to the ground is poor;
Seawater has a strong ability to absorb radio waves, so the seaside test effect is poor;
If there is a metal object near the antenna, or placed in a metal shell, the signal attenuation will be very serious;
The power register is set incorrectly, and the air rate is set too high(the higher the air rate, the closer the distance);
The low voltage of the power supply at room temperature is lower than the recommended value, and the lower the voltage, the
lower the output power;
Poor matching of the antenna and the module or the quality of the antenna itself.
6.2 Modules are easily damaged
Please check the power supply to ensure that it is between the recommended supply voltages, if exceeding the maximum value
will cause permanent damage to the module;
Please check the stability of the power supply, the voltage should not fluctuate greatly and frequently;
Please ensure anti-static operation during installation and use, and high-frequency components are electrostatically sensitive;
Please ensure that the humidity during installation and use should not be too high, and some components are humidity-sensitive
devices;
If there is no special requirement, it is not recommended to use it at too high or too low temperature.

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7 Welding Operation Instructions
7.1 Reflow soldering temperature
Profile Feature
Curve feature
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
solder paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min(Tsmin)
Minimum preheat
temperature
100℃
150℃
Preheat temperature max(Tsmax)
maximum preheat
temperature
150℃
200℃
Preheat Time(Tsmin to Tsmax)(ts)
Preheat time
60-120sec
60-120sec
Average ramp-up rate(Tsmax to Tp)
average rate of ascent
3℃/second max
3℃/second max
Liquidous Temperature(TL)
liquidus temperature
183℃
217℃
Time(tL)Maintained Above(TL)
time above liquidus
60-90sec
30-90 sec
Peak temperature(Tp)
peak temperature
220-235℃
230-250℃
Aveage ramp-down rate(Tp to Tsmax)
average rate of descent
6℃/second max
6℃/second max
Time 25℃to peak temperature
Time from 25°C to peak
temperature
6 minutes max
8 minutes max