HLK-7688A IoT Home Automation Serial Wireless Module
Product Information
The HLK-MT7688A is a low-cost and low-power consumption IoT
module developed by Hi-Link. It is based on the MT7688AN chipset
and supports the Linux, OpenWRT operating systems, and custom
development. The module is designed for smart devices and cloud
services applications, offering a rich interface and powerful
processors.
Basic Parameters
- High data processing ability
- MCU frequency: 580MHz
- 150M Mbps
- Supports 802.11b/g/n
- 20/40 Channel bandwidth
- Supports 802.11v
- Supports AP, STA, and AP/STA mixed modes
- 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 - Inbuilt powerful PMU
- Supports 16 Multiple BSSID
- Supports multiple security methods: WEP64/128, TKIP, AES, WPA,
WPA2, WAPI - Supports QoS WMM/WMM-PS
Power Specifications (for Japan)
- 802.11b (2412-2472MHz): 6.0mW/MHz
- 802.11b (2484MHz): 6.0mW/MHz
- 802.11g (2412-2472MHZ): 3.0mW/MHz
- 802.11n HT20 (2412-2472MHZ): 1.5mW/MHz
- 802.11n HT40 (2422-2472MHZ): 1.0mW/MHz
Product Usage Instructions
The HLK-MT7688A module can be used in various IoT applications.
It provides a wide range of peripheral interfaces such as SPI, I2C,
I2S, PCM, UART, JTAG, and GPIO for connecting with other devices or
sensors.
Typical Application
The HLK-7688A module can be used in various smart devices or
cloud services applications.
Specification
- Item Model: HLK-7688A
- Chipset: MT7688AN
- Kernel: MIPS24KEc
- Basic frequency: 580MHz
- RAM: DDR2 128MB
- Flash: 32MB
- Temperature: -20°C to 55°C (working), 0°C to 85% non-condensing
(storage) - Humidity: 0% to 85% non-condensing (working and storage)
- Size: Please refer to the product documentation.
Module Pins Definition
The HLK-7688A module has various pins for different functions.
Please refer to the pin definition table provided in the user
manual for detailed information on each pin’s function.
For specific usage instructions and detailed pin mappings,
please consult the HLK-7688A user manual.
HLK-7688A user manual
1.INTRODUCTION
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.
1.1. BASIC PARAMETERS
High data processing abilityMCU 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 interfacesSPI,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 QoSWMMWMM-PS The following power is for Japan.
802.11b (2412-2472MHz): 6.0mW/MHz 802.11b (2484MHz): 6.0 mW/MHz 802.11g (2412-2472MHZ):3.0mW/MHz 802.11n HT20 (2412-2472MHZ): 1.5mW/MHz 802.11n HT40 (2422-2472MHZ): 1.0mW/MHz
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2.1. Typical application
HLK-7688A typical peripheral interfaces
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2.2. Specification
Item Model Chipset Kernel Basic frequency RAM Flash Temperature
Humidity
Size
Parameter HLK-7688A MT7688AN MIPS24KEc
580MHz DDR2 128MB
32MB Environmental temperature-20~55 working0~85%noncondensing Storage 0~85%noncondensing
18mm×32.8mm×2.8mm
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3. MODULE PINS DEFINITION
3.1. DEFAULT PINS DEFINITION
HLK-7688A default definition
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3.2. DEGAULT PINS DEFINITION
Name
PIN function 1 Function 2 Function 3 Function 4
1
GND
2
3.3VD
3
3.3VD
4
GND
5 SPI_CS0
GPIO
Note
REF_CLK0
6
7 PERST_N
8 WDT_RST_N
9 EPHY_LED4 JTAG_RST_N
10 EPHY_LED3 JTAG_CLK
11 EPHY_LED2 JTAG_TMS
12 EPHY_LED1 JTAG_TDI
13 EPHY_LED0 JTAG_TDO
14 PORST_N
15 UART_TXD1
16 UART_RXD1
17 I2S_SDI PCMDRX
18 I2S_SDO PCMDTX
19 I2S_WS
PCMCLK
20 I2S_CLK
PCMFS
21
22
ANT
23
24 I2C_SCLK
25 I2C_SD
26 SPI_CS1
27 SPI_CLK
PWM_CH0 PWM_CH1
GND
3333333333333333333333 3333333333333333333Tim GPIO38 e output GPIO36 PCIe device reset GPIO37 GPIO39 GPIO40 GPIO41 GPIO42 GPIO43
Reset
GPIO45 GPIO46 GPIO0 GPIO1 GPIO2 GPIO3
GND GPIO4 GPIO5 GPIO6 GPIO7
6
28 SPI_MISO
GPIO9
29 SPI_MOSI
GPIO8
30 GPIO0
GPIO11
31 UART_TXD0
GPIO12
32 UART_RXD0
GPIO13
33 WLED_N
GPIO44
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 1All pins are Default function 1.
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WiFi LED
FCC Caution: Any C hanges or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. 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. FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment .This equipment should be installed and operated with minimum distance 20cm between the radiator& your body. When the module used in devices requiring additional RF exposure compliance information (e.g., MPE evaluation or SAR testing). OEM antegrators Installation Manual List of applicable FCC rules This module has been tested and found to comply with part 15.247 requirements for Modular Approval. The input voltage to the module should be nominally 3.3V DC, typical value 3.3V DC and the ambient temperature of the module should not exceed 55 Limited module procedures N/A Trace antenna designs N/A Antenna The module of HLK-7688A has one antenna port and the antenna gain as below: 2.4G Wi-Fi: 2.89dBi, Antenna cable loss: 0.5dB The external antenna is Dipole Antenna. Label and compliance information When the module is installed in the host device, the FCC ID label must be visible through a window on the final device or it must be visible when an access panel, door or cover is easily reamoved. If not, a second label must be placed on the outside of the final device that contains the following text: Contains Transmitter Module FCC ID: 2BBXW-7688, the FCC ID can be used only when all FCC ID compliance requirements are met.
Information on test modes and additional testing requirements a)The modular transmitter has been fully tested by the module grantee on the required number of channels, modulation types, and modes, it should not be necessary for the host installer to re-test all the available transmitter modes or settings. It is recommended that the host product manufacturer, installing the modular transmitter, perform some investigative measurements to confirm that the resulting composite system does not exceed the spurious emissions limits or band edge limits (e.g., where a different antenna may be causing additional emissions). b)The testing should check for emissions that may occur due to the intermixing of emissions with the other transmitters, digital circuitry, or due to physical properties of the host product (enclosure). This investigation is especially important when integrating multiple modular transmitters where the certification is based on testing each of them in a stand-alone configuration. It is important to note that host product manufacturers should not assume that because the modular transmitter is certified that they do not have any responsibility for final product compliance. c)If the investigation indicates a compliance concern the host product manufacturer is obligated to mitigate the issue. Host products using a modular transmitter are subject to all the applicable individual technical rules as well as to the general conditions of operation in Sections 15.5, 15.15, and 15.29 to not cause interference. The operator of the host product will be obligated to stop operating the device until the interference has been corrected.
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Additional testing, Part 15 Subpart B disclaimer The final host / module combination need to be evaluated against the FCC Part 15B criteria for unintentional radiators in order to be properly authorized for operation as a Part15 digital device. The host integrator installing this module into their product must ensure that the final composite product complies with the FCC requirements by a technical assessment or evaluation to the FCC rules, including the transmitter operation and should refer to guidance in KDB 996369. For host products with certified modular transmitter, the frequency range of investigation of the composite system is specified by rule in Sections 15.33(a)(1) through (a)(3), or the range applicable to the digital device, as shown in Section 15.33(b)(1), whichever is the higher frequency range of investigation. When testing the host product, all the transmitters must be operating. The transmitters can be enabled by using publicly available drivers and turned on, so the transmitters are active. In certain conditions it might be appropriate to use a technology-specific call box (test set) where accessory devices or drivers are not available. When testing for emissions from the unintentional radiator, the transmitter shall be placed in the receive mode or idle mode, if possible. If receive mode only is not possible then, the radio shall be passive (preferred) and/or active scanning. In these cases, this would need to enable activity on the communication BUS (i.e., PCIe, SDIO, USB) to ensure the unintentional radiator circuitry is enabled. Testing laboratories may need to add attenuation or filters depending on the signal strength of any active beacons (if applicable) from the enabled radio(s). See ANSI C63.4, ANSI C63.10 and ANSI C63.26 for further general testing details.
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