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1.
Introduction
There is an increasing trend towards connecting every imaginable electrical or electronic device
found in the home. For many of these applications developers simply want to add the ability to
remotely control a device — turn on a table lamp, adjust the temperature setting of an air-
conditioner or unlock a door.
The MediaTek MT7681 chipset is designed to fulfil this need.
1.1.
MediaTek MT7681
The MediaTek MT7681 is a compact Wi-Fi System-on-Chip (SoC) with embedded TCP/IP stack for
IoT devices. By adding the MT7681 to an IoT device it can connect to other smart devices or to
cloud applications and services.
Connectivity on the MT7681 is achieved using Wi-Fi, in either Wi-Fi station or access point (AP)
mode.
In Wi-Fi station mode, MT7681 connects to a wireless AP and can then communicate with web
services or cloud servers. A typical use of this option would be to enable a user to control the
heating in their home from a home automation website.
To simplify the connection of an MT7681 chip to a wireless AP in Wi-Fi station mode, the MediaTek
Smart Connection APIs are provided. These APIs enable a smart device app to remotely provision
a MT7681 chip with AP details (SSID, authentication mode and password).
In AP mode, an MT7681 chip acts as an AP, enabling other wireless devices to connect to it directly.
Using this mode, for example, the developer of a smart light bulb could offer users a smartphone
application that enables the bulbs to be controlled from within the home.
To control the device an MT7681 is incorporated into, the chip provides five GPIO pins and one
UART port. In addition PWM is supported in software, for applications such as LED dimming.
A block diagram illustrating the components of the chipset is shown in Figure 1.
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™ Connect 7681 Developer's Guide
Figure 1 Block diagram of the MT7681
© 2015, 2016 MediaTek Inc.
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