NFC/RFID tag for embedded devices
Using the NFC/RFID tag doesn’t require a host microcontroller as the tag combines a wireless NFC/RFID interface with an I²C interface. Designers can now collect vital system data from portable devices even when the main energy source on the master device is not functional, the RFID chip being powered by the reader’s RF field.
Enabling wireless, contactless data collection between a host and slave device, the chisp integrates a proven SHA-256 cryptographic engine for symmetric challenge-and-response authentication based on a secret key for data downloads. The MAX66242’s I²C interface port can operate as a master port or a slave port for secure data exchanges.
The IC comes with multiple memory programmable options which let a user configure a secure master/slave system and set usage limits using the EEPROM emulation mode to create nonresettable counters. Designers can also use the MAX66242 to set up easy and intuitive WiFi or Bluetooth connections as a means to securely storing the pairing codes. It then provides security for access control, asset tracking, system alert/wakeup, and authentication of medical sensors for the secure transfer of personal data.
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