MT7628 Users Manual

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Guangzhou Elementary Charge Communication Technology Co., LTD

Guangzhou Elementary Charge Communication Technology Co., LTD

Overview
This document mainly introduces the electrical characteristics,
mechanical dimensions, pin definition and development supporting
resources of the syq-mt7628/7688 WIFI module.

Supporting Development Board Version.
The development board version which is compatible with this module
is as follows, and the corresponding development board can be purchased
to speed up the development process.
Name
DYQ-MT76X8
YDH-MT76X8KIT
LDS_MT76X8

Version
V1.1
V1.2
V1.0

Applicable Scenario
This module is suitable for many scenarios, such as the following
scenario.
 routing product
 DTU
 IOT
 Wireless communication
 WiFi AP

A Revision History
The revision record accumulates a description of each document
update.The latest version of the document contains updates to all previous
versions of the document.
Data
2017-09-30
2017-10-17
2017-11-06
2018-02-06
2018-04-02

Version
V1.0
V1.1
V1.2
V1.3
V1.4

Instructions
First release
Modify part error
Add some content
Modify part error
Increase rf parameters

Guangzhou Elementary Charge Communication Technology Co., LTD

Directory
1、INSTRUCTIONS..........................................................................................................1
1.1 INTRODUCTION OF THE MODULE................................................................................ 1
1.2 MAIN

APPLICATION AREAS........................................................................................ 1

1.3 FEATURES............................................................................................................... 1
1.4 DIAGRAM.................................................................................................................2
1.5 BASIC PARAMETER................................................................................................... 3
2、MODULE DEFINITION................................................................................................7
2.1 PIN DEFINITION.....................................................................................................7

2.2 Package Dimensions...................................................................................10
2.3 Development Kit.........................................................................................11

Guangzhou Elementary Charge Communication Technology Co., LTD

1、Instructions
1.1 Introduction Of The Module
The syq-mt7628/7688 WIFI module is a low-cost and low-power iot module
based on MT7628/7688.The module supports Linux operating system,
OpenWRT,LEDE and custom development, is the integration of 802.11 b/g/n
WIFI solution, can be widely applied to intelligent devices and the
application of cloud services, including cable, wireless cameras, hard,
routers, wireless speakers, wireless AP storage, etc.

1.2 Main application areas
 IOT
 WiFi intelligent household
 WiFi intelligent household
 Industrial control
 Consumer electronics
 Wireless camera
 Hard AP
 Router
 Wireless speaker
 Wireless storage
 WiFi hotspot
 WiFi mobile power supply
 Wired network to WiFi.

1.3 Features
This module adopts MT7628NN/7688AN scheme, small size and stable
performance.The main features are as follows.
（1）Super small volume, length and width is only 55mm x 38mm.
（2）2.0mm pin interface for easy installation.
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Guangzhou Elementary Charge Communication Technology Co., LTD
（3）Optional ceramic antenna and i-pex interface.
（4）3.3V single power supply.
（5）Wired & wireless router scheme.
（6）Support 802.11b /g/n protocol, maximum 300/150mbps.
（7）Wired support 1WAN and 4LAN, 10M/100M self-adaptive.
（8）Moderate RF power consumption.
（9）Onboard 32-256mb DDR2 memory, 8-32mb FLash.
（10）480Mbps high-speed USB interface.
（11）3 UART (UART0 for system Debug).
（12）TCP turns the serial port.
（13）Sd-xc, eMMC, PCM, IIS digital audio interface (192K/24bits),
IIC communication interface, PWM, SPI master/slave.
（14）GPIO.

1.4 Diagram

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Guangzhou Elementary Charge Communication Technology Co., LTD

1.5 Basic Parameter
classification

Wireless
parameters

parameter
Wireless rate

150Mbps OR 300Mbps

Frequency range

2.4GHz-2.4835GHz

Wireless standards

IEEE 802.11b/g/n

Wireless options

I-pex connector OR onboard
ceramic antenna.

Hardware
parameters

Board level
software

impedance

50Ω

Chipset

MT7628/MT7688

Kernel

MIPS24KEc

Basic frequency

580MHz

RAM

DDR2 32MB,64MB,128MB,256MB

Flash

8MB,16MB,32MB

Data interface

UART、IIS、IIC、SPI、PWM、GPIO

size

55mmX38mm

Custom development

Provide SDK for customer
secondary development.

Wireless type

AP/STA/AP+STA

Encryption type

WEP64/WEP128

Security mechanism

WEP/WAP-PSK/WPA2-PSK/AES

This module supports onboard ceramic antenna and external
antenna.When customers use a built-in antenna, note:
（1）keep the antenna away from the metal, at least 10mm spacing with the
surrounding high components.
（2）the antenna part shall not be covered by metal shell, and the plastic
shell shall be kept at least 10mm.

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Guangzhou Elementary Charge Communication Technology Co., LTD
1.6 Electric Parameter
Item

condition

Min

Typ

Max

Unit

Operating temperature

-20

55

℃

Storage Temperature

-45

125

℃

Maximum welding

IPC/JEDEC

℃

J-STD-020

temperature
Operating voltage

2.97

Arbitrary I/O voltage

0

Electrostatic discharge

3.3

3.62

V

3.3

V

TAMB=25℃

2

KV

TAMB=25℃

2

KV

(human model)
Electrostatic discharge
(charging device model)

1.7 RF Parameter
1.7.1 802.11b 11M
802.11b Transmit (Conductive)
Item

Condition

Frequency

Min

Typ

Channel 1

Max

Unit

Channel 11

Range
Tx Power

DQPSK

15.5

16

16.5

dBm

-1

0

1

ppm

Level
Frequency
Tolerance
MaskErr

0

5.12

%

EVM

-45

-20

dB

Max

Unit

802.11b Receiver (Conductive)
Item
Frequency

Condition

Min

Typ

Channel 1

Range
4

Channel 11

Guangzhou Elementary Charge Communication Technology Co., LTD
Min. Input 11Mbps PER<8%

-91.5

-89.5

-87.5

dBm

Max

Unit

1.7.2 802.11g 54M
802.11g Transmit (Conductive)
Item

Condition

Frequency

Min

Typ

Channel 1

Channel 11

Range
Tx Power

OFDM

15.5

16

16.5

dBm

-1

0

1

ppm

Level
Frequency
Tolerance
MaskErr

0

5.12

%

EVM

-45

-20

dB

Max

Unit

802.11g Receiver (Conductive)
Item

Condition

Frequency

Min

Typ

Channel 1

Channel 11

Range
Min. Input 54Mbps PER<8%

-78.0

-76.0

-74.0

dBm

Max

Unit

1.7.3 802.11n MCS7(HT20)
802.11n_HT20 Transmit (Conductive)
Item

Condition

Frequency

Min

Typ

Channel 1

Channel 11

Range
Tx Power

OFDM

15.5

16

16.5

dBm

-1

0

1

ppm

5.12

%

Level
Frequency
Tolerance
MaskErr

0
5

Guangzhou Elementary Charge Communication Technology Co., LTD
EVM

-45
802.11n_HT20

Item

Condition

Frequency

-27

dB

Max

Unit

Receiver (Conductive)
Min

Typ

Channel 1

Channel 11

Range
Min. Input

MCS7 PER<10%

-76.5

-74.5

-72.5

dBm

Max

Unit

1.7.1 802.11n_MCS7(HT40)
802.11n_HT40 Transmit (Conductive)
Item

Condition

Frequency

Min

Typ

Channel 1

Channel 11

Range
Tx Power

DQPSK

15.5

16

16.5

dBm

-1

0

1

ppm

Level
Frequency
Tolerance
MaskErr

0

5.12

%

EVM

-45

-27

dB

Max

Unit

802.11n_HT40 Receiver (Conductive)
Item

Condition

Frequency

Min

Typ

Channel 1

Channel 11

Range
Min. Input

MCS7 PER<10%

-76.5

-74.5

6

-72.5

dBm

Guangzhou Elementary Charge Communication Technology Co., LTD

2、Module Definition

After the power supply, the voltage supply is normally blue, and the
red light indicates that the WIFI startup is successful, that is, the
system starts normally, and the green light corresponds to GPIO0 (GPIO
mode is GPIO11) according to the system software setting.

2.1 Pin Definition

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Guangzhou Elementary Charge Communication Technology Co., LTD
Pin

Name

Type

Note

1

GPIO0

I/O

GPIO,Connect to green light

2

*UART_TX0

O

UART0 send，3.3V cmos level

UART_RX0

I

UART0 receive,Internal
pull-down 10K resistance.

3

3.3V cmos level
4

RXIP0

I/O

WAN RX+

5

RXIN0

I/O

WAN RX-

6

TXOP0

I/O

WAN TX+

7

TXON0

I/O

WAN TX-

8

TXOP1/PWM_CH0

I/O

LINK0 TX+/PWM

9

TX0N1/PWM_CH1

I/O

LINK0 TX-/PWM

10

RXIP1/UART_TXD2

I/O

LINK0 口 RX+/UART2

11

RXIN1/UART_RXD2

I/O

LINK0 口 RX-/UART2

12

RXIP2/SD_D7/GPIO18

I/O

LINK1 口 RX+/SD data7

13

RXIN2/SD_D6/GPIO19

I/O

LINK1 口 RX-/SD data6

14

TXOP2/SD_D5/GPIO20

I/O

LINK1 口 TX+/SD data5

15

TXON2/SD_D4/GPIO21

I/O

LINK1 口 TX-/SD data4

TXOP3SD_WP

I

LINK2 口 TX+/SD write

16

protection
17

TXON3/SD_CD

I

LINK2 口 TX-/SD Detection

18

RXIP3/SD_D1

I/O

LINK2 口 RX+/SD data1

19

RXIN3/SD_D0

I/O

LINK2 口 RX-/SD data0

20

RXIP4/SD_CLK

O

LINK3 口 RX+/SD clock

21

RXIN4/SD_CMD

I/O

LINK3 口 RX-/SD command

22

TXOP4/SD_D3

I/O

LINK3 口 TX+/SD data3

23

TXON4/SD_D2

I/O

LINK3 口 TX-/SD data2

24

GND

Power

Power Ground

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Guangzhou Elementary Charge Communication Technology Co., LTD
25

USB_DP

I/O

USB2.0 D+

26

USB_DM

I/O

USB2.0 D-

DC3V3

Power

27

Power (Need ripple small,
current is big) use DC-DC
chip

DC3V3

Power

28

Power (Need ripple small,
current is big) use DC-DC
chip

29

GND

Power

Power Ground

30

*PERST_N

I/O

PCIe device reset

31

REF_CLKO

I/O

CLKOUT

32

WPS_RST_BUTTON

I/O

WatchDog reset

33

CPURST_N

I/O

System reset

GPIO39

I/O

The default is LINK3 status

34

indication.
GPIO40

I/O

The default is LINK2 status

35

indication.
GPIO41

I/O

The default is LINK1 status

36

indication.
GPIO42

I/O

The default is LINK0 status

37

indication.
GPIO43

I/O

The default is WAN status

38

indication.
39

WLED_N

O

WIFI status indicator

*UART_TX1

O

UART1 send

40

3.3V cmos level
UART_RX1

I

UART1 receive

41

3.3V cmos level
42

I2S_SDI

I
9

I2S data input

Guangzhou Elementary Charge Communication Technology Co., LTD
43

*I2S_SDO

O

I2S data output

I2S_WS

O

I2S Audio interface ADC left

44

/ right clock
45

I2S_CLK

O

I2S Bit Clock

46

I2C_SCLK

O

I2C Clock

47

I2C_SD

I/O

I2C Data

48

*SPI_CS1

I

49

SPI_MISO

I

SPI_CS0

O

SPI Chip Selection(default

50

selection)
51

*SPI_CLK

O

52

*SPI_MOSI

O

The red signal with the prefix "red" is used for the system startup
configuration, and the external non-driver is not pulled down, which will
cause the startup to fail.
For more details on multiplexing, check out the Datasheet.

2.2 Package Dimensions

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Guangzhou Elementary Charge Communication Technology Co., LTD
The pin spacing is 2.0mm. When the client designs PCB, clients can
contact our company to provide packaging, which can provide the schematic
diagram of AD, PADS, Orcad, Allergo and PCB packaging.

2.3 Development Kit
The Elementary Charge Communication Technology

provides

dyq-mt76x8 , ydh-mt76x8 kit and lds-mt76x8 evaluation and development kit
for customers to quickly become familiar with the products and develop
in-depth application.

11

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