MediaTek LinkIt™ Smart 7688 User Manual Version: 0.9 Beta Release date: October 2015 Specifications are subject to change without notice. © 2015, 2016 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction of this information in whole or in part is strictly prohibited.
MediaTek LinkIt™ Smart 7688 User Manual Document Revision History Revision 0.9 Date October 2015 Description Close Beta © 2015, 2016 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
MediaTek LinkIt™ Smart 7688 User Manual 1. Introduction LinkIt Smart 7688 development platform is an IoT development platform by MediaTek Labs. It enables you to design and create Wi-Fi connected devices for the home, the office and Cloud applications. 1.1. What is MediaTek LinkIt Smart 7688 Development Platform The LinkIt Smart 7688 is an open development platform based on Linux distribution OpenWrt.
MediaTek LinkIt™ Smart 7688 User Manual Interface Count Fast Ethernet Switch 5 I2S 1 PCM 1 PWM 4 SPI 1 I2C 1 UART(Lite) 3 JTAG 1 Table 1 MT7688AN SOC Specification 1.3. LinkIt Smart 7688 LinkIt Smart 7688 is one of the most highly integrated and compact hardware development boards available for IoT prototyping. 1.3.1. Key Features LinkIt Smart 7688’s key features include the following: • Wi-Fi 802.11 b/g/n (2.
MediaTek LinkIt™ Smart 7688 User Manual Figure 1 LinkIt Smart 7688 development board (MPU only) 1.3.2. Buttons The buttons description on LinkIt Smart 7688 and how to use them are described in Table 2.
MediaTek LinkIt™ Smart 7688 User Manual Scenario Button Action Wi-Fi Reset Button (At power up) Press for at least 5 seconds and release Wi-Fi Reset Button (At power up) Press for at least 20 seconds and release removed from the device Upgrades firmware from a USB drive Upgrades boot loader from a USB drive WARNING: Restore to default setting and all user data will be removed from the device Table 2LinkIt Smart 7688 Development board buttons 1.3.3.
MediaTek LinkIt™ Smart 7688 User Manual 1.3.4. Antenna There are two types of antenna support available on LinkIt Smart 7688 development board: 1) Built in Wi-Fi chip antenna and it is the default antenna. 2) I-PEX connector for external antenna. To enable the connector, you’ll need to remove the resistor R233 located on the top left corner of the I-PEX connector, as circled in Figure 2. Figure 2 Removing the resistor to enable I-PEX connector 1.3.5.
MediaTek LinkIt™ Smart 7688 User Manual Approximate Power Consumption Scenario Downloading file to a SD Card via Wi-Fi Downloading a file to a USB Drive via Wi-Fi Downloading a file to flash via Wi-Fi Average 195.1 mA Peak 540.4 mA Average 275.8 mA Peak 569.5 mA Average 304.9 mA Peak 522.4 mA Average 271.3 mA Table 4 Peripherals Power Consumption 1.3.7. Accessories LinkIt Smart 7688’s standard package comes with the development board only.
MediaTek LinkIt™ Smart 7688 User Manual 1.3.8. Breakout Board (TBD) 1.3.9. JTAG You can use JTAG interface to debug MT7688AN. To access JTAG interface, you will need to unsolder resistor R95 and solder it to resistor R3 on the 7688 development board. After you’ve moved the resistor and reboot the device you’ll activate JTAG function. The steps are: 1) Find a group of resistors on the bottom side of LinkIt Smart 7688 (top-right view) as circled in below.
MediaTek LinkIt™ Smart 7688 User Manual 1.3.10. Specifications The key specifications of LinkIt Smart 7688 development boards are shown inTable 5. Category MPU PCB Size Memory Power Source GPIO LinkIt Smart 7688 Spec. Feature Chipset MT7688AN Core MIPS24KEc Clock speed 580MHz Working voltage 3.3V Dimensions 55.7 Flash 32MB RAM 128MB DDR2 USB Power 5V (USB Micro-B) VCC 3.3V (Pin Breakout) Pin Count 22 (MT7688AN) Voltage 3.3v Pin Count 4 (MT7688AN) Voltage 3.3v Max.
MediaTek LinkIt™ Smart 7688 User Manual Category LinkIt Smart 7688 Spec. Feature • P22, P23,P24 (Shared with on-board flash) • P25 Pin numbers SPI Slave I2S I2C Max. Speed 25 MHz Set count 1 Pin numbers P28, P29, P30, P31 Max. Speed 25 MHz Set Count 1 (MT7688AN) Pin numbers P10, P11, P12, P13 Set Count 1 Pin numbers P20, P21 Speed 120K/400K Set Count UART (Lite) USB Host Communicatio n User Storage (MT7688AN) 3 (MT7688AN) Pin numbers P8, P9, P16, P17, P18, P19 Max.
MediaTek LinkIt™ Smart 7688 User Manual 1.3.11. Pin-out Diagram This pin-out diagram helps you to map the pins on LinkIt Smart 7688 development board to the peripheral devices you want to attach through interfaces such as GPIO, PWM, I2C, I2S, SPI, UART and more. The available pins for LinkIt Smart 7688 HDK are illustrated in the next page. You can also download it from MediaTek Labs website. © 2015, 2016 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc.
MediaTek LinkIt™ Smart 7688 User Manual 1.4. LinkIt Smart 7688 Duo LinkIt Smart 7688 Duo is powered by the same MT7688AN SOC as LinkIt Smart 7688, but adds an extra ATMega32U4 on the development board. This supports additional features including Analog I/O support and Arduino IDE support.
MediaTek LinkIt™ Smart 7688 User Manual 1.4.2. Buttons The buttons description on LinkIt Smart 7688 Duo and how to use them are described in Table 7.
MediaTek LinkIt™ Smart 7688 User Manual Wi-Fi Wi-Fi LED is in orange color and its blink pattern is described in Table 7 . Mode AP Mode Station Mode Status LED blink pattern With client device 3 blinks in 1 second and pause for 0.5 seconds (cycle repeats) Without client device Off Disconnected Off Connecting 2 blinks in 1 second Data transmission Blinking based on the transmitted data package Table 7 Wi-Fi LED blink pattern in LinkIt Smart 7688 Duo 1.4.4.
MediaTek LinkIt™ Smart 7688 User Manual Approximate Power Consumption Scenario Downloading a file to a USB Drive via Wi-Fi Peak 616.6 mA Average 347.5 mA Downloading a file to flash via Wi-Fi Peak 578.5 mA Average 336.3 mA Table 8 Peripherals Power Consumption 1.4.7. Accessories LinkIt Smart 7688 Duo standard package comes with the development board only. The accessories are the same as LinkIt Smart 7688. Please refer to 1.3.7”Accessories” for more information. 1.4.8.
MediaTek LinkIt™ Smart 7688 User Manual Figure 8 Moving a resistor to access JTAG mode 1.4.9. Specifications The key specifications of LinkIt Smart 7688 Duo development board are shown in Table 9. Category MPU MCU PCB Size Memory Power Source GPIO PWM Feature LinkIt Smart 7688 Duo Chipset MT7688AN Core MIPS24KEc Clock speed 580MHz Working voltage 3.3V Chipset ATmega32U4 Core Atmel AVR Clock speed 8MHz Working voltage 3.3V Dimensions 60.
MediaTek LinkIt™ Smart 7688 User Manual Category Feature Maximum Frequency@ Resolution ADC External Interrupts SPI/SPIS I2C USB Host Communicatio n User Storage 31.25kHz@8-bit Timer 0 (4 sets) Pin Count 2MHz@2-bit 122Hz@16-bit Timer 1 & 3 (4 sets) 187.5kHz@8-bit 46.875kHz@10-bit Timer 4 (6 sets) 12 (ATmega32U4) Voltage 3.3v Pin Count 8 (ATmega32U4) Set count 1 (ATmega32U4) Pin numbers S0, S1, S2, S3 Max.
MediaTek LinkIt™ Smart 7688 User Manual 1.4.10. Pin-out Diagram The LinkIt Smart 7688 Duo pin-out diagram is shown in the next page. You can also download LinkIt Smart 7688 Reference Design at MediaTek Labs website. © 2015, 2016 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
MediaTek LinkIt™ Smart 7688 User Manual 1.5. Joining the MediaTek Labs Ecosystem Wearable and Internet of Things are the next wave in the consumer gadget revolution. MediaTek is a key player in this field, combining the best of two worlds —the existing MediaTek ecosystem of phone manufacturers, electronic device manufacturers, and telecom operators with the open, vibrant maker community world.
MediaTek LinkIt™ Smart 7688 User Manual 2. Development Environment 2.1. Operating Systems The following operating systems can be used to access LinkIt Smart 7688 development boards: • Windows XP, 7, 8 and 10 • Mac OS X 10.9 and 10.10 • Linux Ubuntu 14.04 LTS An overview of the OS capabilities is shown in Table 10: Windows Ubuntu Mac X Yes Yes Yes To build bootloader, firmware and C programs No Yes Yes Python, Node.
MediaTek LinkIt™ Smart 7688 User Manual Figure 9 LinkIt Smart 7688 in AP Mode 2.3.2. Station Mode For a network with Wi-Fi access point, LinkIt Smart 7688 acts as a station. Station mode is used when you want to install software from OpenWrt to LinkIt Smart LinkIt Smart 7688 HDK, for example. Figure 10 illustrates how LinkIt Smart 7688 works in a LAN with Wi-Fi AP. Figure 10 LinkIt Smart 7688 in Station Mode 2.4.
MediaTek LinkIt™ Smart 7688 User Manual you’re using Windows 7, you’ll need to install Bonjour printing service to help your computer discover LinkIt Smart 7688 (IP address) when in Station mode on a local area network with a Wi-Fi AP. 2.4.1. Accessing Web UI LinkIt Smart 7688 Web UI allows you to configure system information, upgrade firmware, perform device reset and change between Wi-Fi AP and Client mode and more. The following steps apply to Windows, Mac OS X and Linux.
MediaTek LinkIt™ Smart 7688 User Manual Figure 13 LinkIt Smart 7688 Web UI Sign In 4) Click on the Password field and set a password using at least 6 alphanumeric characters. Note: You must set a password before using SSH to access system console. 2.4.2. Accessing System Console There are two ways to access the system console on LinkIt Smart 7688 development board. They are described as follows: 2.4.3.
MediaTek LinkIt™ Smart 7688 User Manual Figure 14 Using SSH in Windows PuTTY 3) In the PuTTY terminal window that opens, log in with username root and enter the password you set previously in the Web UI, after log in you should see a screen similar to below. For Mac: © 2015, 2016 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
MediaTek LinkIt™ Smart 7688 User Manual Open Terminal. In the Terminal, type ssh root@myLinkIt.local at the command line, hit return and you’ll be prompted to enter the root password. Enter the password you set previously in the Web UI. For Linux: Open Terminal. In the Terminal, type ssh root@myLinkIt.local at the command line, hit return and log in using the password you set previously. For more information on using SSH, please reference here. 2.4.4.
MediaTek LinkIt™ Smart 7688 User Manual Figure 15 Using UART to USB cable to access system console in Windows terminal 4) To exit the system console, click the X on top right of the PuTTY windows. For Mac: 1) Install the driver if needed. Check the cable manufacturer’s website for driver requirements on Mac and installation instructions. 2) Plug-in the cable and connect the cable to LinkIt Smart LinkIt Smart 7688. 3) Open a Terminal session. Applications/Utilities/Terminal.
MediaTek LinkIt™ Smart 7688 User Manual 5) Use the screen utility to connect to the serial port and set the baudrate to 57600. This is because the baudrate of the system console is 57600 by default. For example: $screen /dev/cu.usbserial-XXXXXXXX 57600 6) Now you should be connected to the system console. Press ENTER in the Terminal to bring up the prompt.
MediaTek LinkIt™ Smart 7688 User Manual root@myLinkIt:/# 7) You’re ready to make changes to the LinkIt Smart 7688 system through this console. 8) To exit the system console, type a + k, and y. 2.4.5. Upgrading Firmware This section describes how to upgrade the firmware on both LinkIt Smart 7688 development boards (same firmware). You can choose from one of the following two ways to upgrade firmware: Using Web UI: 1) Sign in the LinkIt Smart 7688 Web UI.
MediaTek LinkIt™ Smart 7688 User Manual Note: Performing firmware upgrade will remove all user data from the development board. Using USB drive : 1) Save the firmware file (lks7688.img) in the root directory of a USB drive. You can download the latest firmware from MediaTek Labs website. 2) Plug the USB drive to LinkIt Smart 7688.
MediaTek LinkIt™ Smart 7688 User Manual 1) Sign in the Web UI 2.4.1” Accessing Web UI” and click the Reset button under Factory Reset, as shown in Figure 18. Figure 18 Factory Reset using LinkIt Smart 7688 Web UI Using the Wi-Fi Reset button After LinkIt Smart 7688 is boot up (power LED solid on, Wi-Fi LED), press the Wi-Fi Reset button for at least 20 seconds and release. Please see Figure 1 for Wi-Fi Reset button locations.
MediaTek LinkIt™ Smart 7688 User Manual Figure 11 Connecting LinkIt Smart 7688 to a computer 3) Click the Wi-Fi icon on your computer and connect to an access point named LinkIt_Smart_7688, as shown in Figure 12. Figure 12 Connecting to LinkIt Smart 7688 AP 4) Open a web browser and type http://myLinkIt .local in the URL box. The Web UI page opens as shown in Figure 13. © 2015, 2016 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc.
MediaTek LinkIt™ Smart 7688 User Manual Figure 13 LinkIt Smart 7688 Web UI Sign In 5) Click on the Password field and set a password using at least 6 alphanumeric characters. Note: You must set a password before using SSH to access system console. 1) Accessing System Console” ): In this example, the following AP is used: # # # # # # # AP SSID: MyAP Encryption type: PSK2 Password: 12345678 uci set wireless.sta.ssid=MyAP uci set wireless.sta.encryption=psk2 uci set wireless.sta.
MediaTek LinkIt™ Smart 7688 User Manual Figure 19 LinkIt Smart 7688 in Station mode connected to a Wi-Fi AP Using Web UI Open a browser and type in myLinkIt.local. Please see 2.4.1”Accessing Web UI” if you’ve not signed in before. 1) Click Network button on upper right as shown in Figure 20 Figure 20 Change networking setting in Web UI 2) Select the station mode and click the Refresh button or downward arrow on the right to find the AP to connect to.
MediaTek LinkIt™ Smart 7688 User Manual Figure 21 Changing to Station mode in Web UI 3) A message window will pop up letting you know the device is connecting to the AP you’ve selected. 4) Notice the Wi-Fi LED, it should blink once a second, this indicates LinkIt Smart 7688 is in Station mode. 5) To change LinkIt Smart 7688 back to AP mode, press the Wi-Fi Reset button for at least 5 seconds and release. When you see three short blinks on Wi-Fi LED, it is in AP mode. 2.4.11.
MediaTek LinkIt™ Smart 7688 User Manual Figure 22 System Information in LinkIt Smart 7688 Web UI 2.5. Accessing the USB drive and the SD card When a USB drive or SD card is inserted into LinkIt Smart 7688, they can be accessed under /Media/SD* or /Media/USB* (The device name displayed varies depending on the number of drives you use and the number of partitions available on the USB drive or SD card).
MediaTek LinkIt™ Smart 7688 User Manual Federal Communication Commission Interference Statement 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. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
MediaTek LinkIt™ Smart 7688 User Manual the FCC ID can not be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization. End Product Labeling This transmitter module is authorized only for use in device where the antenna may be installed such that 20 cm may be maintained between the antenna and users.
