Shenzhen Hi-Link Electronic Co.,Ltd
HLK-7688A user manual
１
1. INTRODUCTION.......................................................................................................................................................... ３
1.1. BASIC PARAMETER.................................................................................................................................................３
2. DIAGRAM..................................................................................................................................................................... ４
2.1. TYPICAL APPLICATION.......................................................................................................................................... ５
2.2. SPECIFICATIONS...................................................................................................................................................... ６
3. ELECTRICAL CHARACTERISTICS...........................................................................................................................６
3.1. INLUT VOLTAGE...................................................................................................................................................... ６
3.2. RF PERFORMANCE..................................................................................................................................................７
3.2.1. 802.11B 11M............................................................................................................................................................ ７
3.2.2. 802.11G 54M............................................................................................................................................................ ７
3.2.3. 802.11N MCS7(HT20)............................................................................................................................................. ８
3.2.4. 802.11N_MCS7(HT40)............................................................................................................................................ ８
4. MODULE PINS DEFINITION......................................................................................................................................９
4.1. DEFAULT PINS DEFINITION.................................................................................................................................. ９
4.2. DEGAULT PINS DEFINITION..................................................................................................................................９
２
1.INTRODUCTION
1.1. BASIC PARAMETERS
High data processing ability，MCU frequency 580MHz
150M Mbps
Support 802.11b/g/n
20/40 Channel bandwidth
Support 802.11v
Support AP,STA and AP,STA mixed
Five 10/100M ETH PORT
1 USB2.0 Host interface port
Interface SPI/SD-XC/eMMC
Rich peripheral interfaces，SPI,I2C,I2S,PCM,UART,JTAG,GPIO
Widely used in IOT
Inbuilt powerful PMU
Support 16 Multiple BSSID
Support multiple security methods WEP64/128, TKIP, AES, WPA, WPA2, WAPI
Support QoS，WMM，WMM-PS
Support Linux 2.6.36 SDK，OpenWrt 3.10
HLK-MT7688A based on MT7688AN is a low cost and low power consumption IOT module developed by
Hi-Link.The module supports Linux, OpenWRT operating system and custom development. It could be widely
applied to smart devices or cloud services application with its rich interface and powerful processors.
３
2. Diagram
40MHz
IPEX Connector
OR
External Antenna
3.3V
MT7688AN
DDR2(128MB)
SPI Flash(32MB)
HLK-7688 structure
４
2.1. Typical application
HLK-7688A typical peripheral interfaces
５
2.2. Specification
Item Parameter
working：0~85%（noncondensing
）
Storage： 0~85%（noncondensing
3. ELECTRONICAL CHARACTERISTICS
3.1. Input voltage
Model HLK-7688A
Chipset MT7688AN
Kernel MIPS24KEc
Basic frequency 580MHz
RAM DDR2 128MB
Flash 32MB
Temperature Environmental temperature：-20℃~55℃
Humidity
）
Size 18mm×32.8mm×2.8mm
Typical
Item Function MIN Voltage（V）
voltage（V）
VBAT Power voltage 3 3.3 3.6
Max voltage
（V）
６
I/O I/O voltage 3 3.3 3.6
3.2. RF PERFORMANCE
3.2.1. 802.11b 11M
3.2.2. 802.11g 54M
802.11b Transmit (Conductive)
Item Condition Min. Typ. Max. Unit
Frequency Range Channel 1 Channel 11
Tx Power Level DQPSK 14 20 16 dBm
Frequency Tolerance -15 0 15 ppm
11MHz→22MHz 40 dBr
Spectral Mask
＞22MHz 53 dBr
Modulation Accuracy All Data Rate 15 %
802.11b Receiver (Conductive)
Item Condition Min. Typ. Max. Unit
Frequency Range Channel 1 Channel 11
Min. Input 11Mbps PER<8% -91.5 -89.5 -87.5 dBm
802.11g Transmit (Conductive)
Item Condition Min. Typ. Max. Unit
Frequency Range Channel 1 Channel 11
Tx Power Level OFDM 9 17 11 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 11
７
Min. Input 54Mbps PER<10% -78.0 -76.0 -74.0 dBm
3.2.3. 802.11n MCS7(HT20)
3.2.4. 802.11n_MCS7(HT40)
802.11n_HT20 Transmit (Conductive)
Item Condition Min. Typ. Max. Unit
Frequency Range Channel 1 Channel 11
Tx Power Level OFDM 9 17 11 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 11
Min. Input MCS7 PER<10% -76.5 -74.5 -72.5 dBm
802.11n_HT40 Transmit (Conductive)
Item
Frequency Range Channel 1 Channel 11
Tx Power Level OFDM 5.0 17.0 8.0 dBm
Frequency Tolerance -15 0 15 ppm
Modulation Accuracy All Data Rate -31 -28 dB
Condition
Min.
Typ. Max.
Unit
802.11n_HT40 Receiver (Conductive)
Item Condition Min. Typ. Max. Unit
８
Frequency Range Channel 1 Channel 11
4. MODULE PINS DEFINITION
4.1. DEFAULT PINS DEFINITION
4.2. DEGAULT PINS DEFINITION
Min. Input MCS7 PER<10% -76.5 -74.5 -72.5 dBm
HLK-7688A default definition
９
１０
PIN
Name
（function
1）
Function 2
Function 3
Function 4
GPIO
Note
1
GND
2
3.3VD
3
3.3VD
4
GND
5
SPI_CS0
6
REF_CLK0
GPIO38
3333333333333333333333
3333333333333333333Tim
e output
7
PERST_N
GPIO36
PCIe device reset
8
WDT_RST_N
GPIO37
9
EPHY_LED4
JTAG_RST_N
GPIO39
10
EPHY_LED3
JTAG_CLK
GPIO40
11
EPHY_LED2
JTAG_TMS
GPIO41
12
EPHY_LED1
JTAG_TDI
GPIO42
13
EPHY_LED0
JTAG_TDO
GPIO43
14
PORST_N
Reset
15
UART_TXD1
PWM_CH0
GPIO45
16
UART_RXD1
PWM_CH1
GPIO46
17
I2S_SDI
PCMDRX
GPIO0
18
I2S_SDO
PCMDTX
GPIO1
19
I2S_WS
PCMCLK
GPIO2
20
I2S_CLK
PCMFS
GPIO3
21
GND
22
ANT
23
GND
24
I2C_SCLK
GPIO4
25
I2C_SD
GPIO5
26
SPI_CS1
GPIO6
27
SPI_CLK
GPIO7
１１
28
SPI_MISO
GPIO9
29
SPI_MOSI
GPIO8
30
GPIO0
GPIO11
31
UART_TXD0
GPIO12
32
UART_RXD0
GPIO13
33
WLED_N
GPIO44
WiFi LED
34
MDI_RP_P0
GPIO24
35
MDI_RN_P0
GPIO23
36
MDI_TP_P0
GPIO22
37
MDI_TN_P0
GPIO21
38
MDI_TP_P1
SPIS_CS
PWM_CH0
GPIO14
39
MDI_TN_P1
SPIS_CLK
PWM_CH1
GPIO15
40
MDI_RP_P1
SPIS_MISO
UART_TXD2
GPIO16
41
MDI_RN_P1
SPI_MOSI
UART_RXD2
GPIO17
42
MDI_RP_P2
eMMC_D7
PWM_CH0
GPIO18
43
MDI_RN_P2
eMMC_D6
PWM_CH1
GPIO19
44
MDI_TP_P2
UART_TXD2
eMMC_D5
PWM_CH2
GPIO20
45
MDI_TN_P2
UART_RXD2
eMMC_D4
PWM_CH3
GPIO21
46
MDI_TP_P3
SD_WP
eMMC_WP
GPIO22
47
MDI_TN_P3
SD_CD
eMMC_CD
GPIO23
48
MDI_RP_P3
SD_D1
eMMC_D1
GPIO24
49
MDI_RN_P3
SD_D0
eMMC_D0
GPIO25
50
MDI_RP_P4
SD_CLK
eMMC_CLK
GPIO26
51
MDI_RN_P4
SD_CMD
eMMC_CMD
GPIO28
52
MDI_TP_P4
SD_D3
eMMC_D3
GPIO29
53
MDI_TN_P4
SD_D2
eMMC_D2
GPIO27
54
USB_DP
55
USB_DM
56
GND
Note ：
1，All pins are Default function 1.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users
must follow the specific operating instructions for satisfying RF exposure compliance.
Note 1: This module certified that complies with RF exposure requirement under mobile or fixed condition, this
module is to be installed only in mobile or fixed applications.
A mobile device is defined as a transmitting device designed to be used in other than fixed locations and to
generally be used in such a way that a separation distance of at least 20 centimeters is normally maintained
between the transmitter's radiating structure(s) and the body of the user or nearby persons. Transmitting devices
designed to be used by consumers or workers that can be easily re-located, such as wireless devices associated
with a personal computer, are considered to be mobile devices if they meet the 20 centimeter separation
requirement.
A fixed device is defined as a device is physically secured at one location and is not able to be easily moved to
another location.
Note 2: Any modifications made to the module will void the Grant of Certification, this module is limited to OEM
installation only and must not be sold to end-users, end-user has no manual instructions to remove or install the
device, only software or operating procedure shall be placed in the end-user operating manual of final products.
Note 3: Additional testing and certification may be necessary when multiple modules are used.
Note 4: To ensure compliance with all non-transmitter functions the host manufacturer is responsible for ensuring
compliance with the module(s) installed and fully operational. For example, if a host was previously authorized as
an unintentional radiator under the Declaration of Conformity procedure without a transmitter certified module
and a module is added, the host manufacturer is responsible for ensuring that the after the module is installed and
operational the host continues to be compliant with the Part 15B unintentional radiator requirements. Since this
may depend on the details of how the module is integrated with the host, Shenzhen HaiLingKe Electronic co., Ltd.
shall provide guidance to the host manufacturer for compliance with the Part 15B requirements.
Note 5: FCC ID label on the final system must be labeled with “Contains FCC ID: 2AD56HLK-7688A” or
“Contains transmitter module FCC ID: 2AD56HLK-7688A”.
FCC Warning
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
NOTE: Any changes or modifications to this unit not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
The OEM integrator is still responsible for the FCC compliance requirement of the end product, which integrates this
module.
１２
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