Shenzhen Hi-Link Electronic Co.
1. INTRODUCTION.......................................................................................................................................................... ３ 1.1. BASIC PARAMETER.................................................................................................................................................３ 2. DIAGRAM...................................................................................................................................................................
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 ability，MCU frequency 580MHz 150M Mbps Support 802.11b/g/n 20/40 Channel bandwidth Support 802.
2. Diagram Ethernet UART 3.
2.1.
2.2. Specification Item Parameter Model HLK-7688A Chipset MT7688AN Kernel MIPS24KEc Basic frequency 580MHz RAM DDR2 128MB Flash 32MB Temperature Environmental temperature：-20℃~55℃ working：0~85%（noncondensing ） Humidity Storage： 0~85%（noncondensing ） Size 18mm×32.8mm×2.8mm 3. ELECTRONICAL CHARACTERISTICS 3.1. Input voltage Item VBAT Function Typical Max voltage voltage（V） （V） 3.3 3.
I/O I/O voltage 3 3.3 3.6 3.2. RF PERFORMANCE 3.2.1. 802.11b 11M 802.11b Transmit (Conductive) Item Condition Frequency Range Tx Power Level Min. Typ. Channel 1 DQPSK Frequency Tolerance Max. Unit Channel 11 14 20 16 dBm -15 0 15 ppm 11MHz→22MHz 40 dBr ＞22MHz 53 dBr All Data Rate 15 % Spectral Mask Modulation Accuracy 802.11b Receiver (Conductive) Item Condition Frequency Range Min. Input Min. Typ. Channel 1 11Mbps PER<8% -91.5 Max. Unit Channel 11 -89.5 -87.
Min. Input 54Mbps PER<10% -78.0 -76.0 -74.0 dBm Max. Unit 3.2.3. 802.11n MCS7(HT20) 802.11n_HT20 Transmit (Conductive) Item Condition Frequency Range Tx Power Level Typ. Channel 1 OFDM Frequency Tolerance Modulation Accuracy Min. Channel 11 9 17 11 dBm -15 0 15 ppm -31 -28 dB Max. Unit All Data Rate 802.11n_HT20 Receiver (Conductive) Item Condition Frequency Range Min. Input Min. Typ. Channel 1 MCS7 PER<10% -76.5 Channel 11 -74.5 -72.5 dBm 3.2.4. 802.
Frequency Range Min. Input Channel 1 MCS7 PER<10% -76.5 Channel 11 -74.5 4. MODULE PINS DEFINITION 4.1. DEFAULT PINS DEFINITION HLK-7688A default definition 4.2. DEGAULT PINS DEFINITION ９ -72.
Name （function PIN 1） Function 2 Function 3 Function 4 1 GND 2 3.3VD 3 3.
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_
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.
