Reference Design Maxim MAXREFDES143

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Detailed Description

The hardware includes a peripheral module representing a protected sensor node monitoring operating temperature and remaining life of a filter (simulated through ambient light sensing) and an mbed shield representing a controller node responsible for monitoring one or more sensor nodes. The design is hierarchical with each controller node communicating data from connected sensor nodes to a web server that maintains a centralized log and dispatches notifications as necessary. The mbed shield contains a Wi-Fi module, a DS2465 coprocessor with 1-Wire master function, an LCD, LEDs, and pushbuttons. The protected sensor node contains a DS28E15 authenticator, a DS7505 temperature sensor, and a MAX44009 light sensor. The mbed shield communicates to a web server by the onboard Wi-Fi module and to the protected sensor node with I²C and 1-Wire. The MAXREFDES143 is equipped with a standard shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The simplicity of this design enables rapid integration into any star-topology IoT network requiring the heightened security with low overhead provided by the SHA-256 symmetric-key algorithm.

Note: Programming the MAXREFDES143 requires a separate purchase of a MAX32600MBED development platform or equivalent Arduino Form Factor platform.

Features

• SHA-256 authentication
• Unique secret for each node in the system
• DeepCover secure key storage
• 1-Wire/I²C/Wi-Fi interfaces
• Example source code
• mbed shield equivalent to Arduino form factor pinout
• Pmod-compatible protected sensor node
• Competitive Advantages
  • Crypto-strong authentication
  • No need for secure key storage memory on processor
  • Low overhead performance for signed data between the web server and the mbed platform
• Applications
  • Authentication of Internet of Things (IoT) device nodes
  • Data authentication at all levels from sensor node to web server
  • Protect industrial applications from counterfeiting
  • Track product lifetime with smart notifications
  • Invalidate unsafe industrial sensor nodes

There are notifications to the user through the web server when intervention is required such as when it is time to change the consumable being monitored (i.e., the protected sensor node), a filter in this case, or if an unsafe consumable (i.e., counterfeit sensor node) is installed.

The simplicity of this design enables rapid integration into any star-topology IoT network requiring the heightened security with low overhead provided by the SHA-256 symmetric-key algorithm.

Reference Design Schematic Diagram