NXP – I2C-enabled RFID tag provides secure wireless link between external devices and any MCU


The UCODE I2C from NXP Semiconductors, which contains two contactless RFID interfaces, a wired I2C interface and a large user memory, enables a new range of applications by providing an RFID bridge to a standard microcontroller.

Examples of the applications enabled by the provision of an RFID link to an embedded MCU include wireless and powerless product configuration. In shelf-life applications, it can take into account parameters such as temperature, humidity and shock from data supplied by sensors.

Each UHF front-end can be enabled or disabled independently via RF or I2C. Independent antennas let the IC support different read-range requirements, and can increase customer privacy because read ranges can be switched. The set-up also makes it easier to design omnidirectional antennas.

The 3,328-bit user memory, accessible via RF or I2C, can be used for software downloads, product information, advanced product configuration management or data storage. The memory offers 20-year data retention and 50,000 cycles of write endurance. It can be read- and write-protected.

Advanced features for managing product configuration and theft deterrence increase security. For example, the device can be set to deactivate after a certain number of uses, and product functions can be managed by simply uploading the configuration. The device can be locked throughout the supply chain, and only be activated after purchase at the point of sale.


  • Best-in-class RF sensitivity
  • Up to 160-bit EPC
  • 96-bit TID, including 48-bit serial number
  • Complies with EPCglobal 1.2.0 RFID standard
  • Interrupt output


  • Electronic serialisation
  • Provisioning
  • Return management
  • Customisation at the end of the supply chain
  • Firmware downloads
  • Counterfeit protection and authentication
  • Sensor applications
  • Electronic shelf labels