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New Type-5 NFC Tags with Dynamic Message Content and Anti-Tamper


Devices include 64-bit encrypted password with failed-attempt counter, as well as digital-signature services to verify die authenticity


Uniquely combining NFC Type-5 properties with augmented NDEF (NFC Data Exchange Format) and tamper detection, STMicroelectronics’ ST25TV512C and ST25TV02KC tags let developers leverage NFC contactless communication in new and imaginative ways for applications in consumer engagement, brand recognition, supply-chain management, and access control.

Click for Larger Image - New Type-5 NFC Tags with Dynamic Message Content and Anti-Tamper The ISO/IEC 15693-compliant NFC Type-5 tags1 respond both to smartphones and 13.56MHz long-range RFID readers and allow native exchange of NDEF messages without a mobile app. Moreover, Augmented NDEF allows dynamically updated information such as tamper status or a personalized URL to be added to NDEF messages. Up to six different attributes can be configured to append to the message including a Unique Tap Code (UTC) that makes messages unique and dynamic at each tap of the tag.

With the added benefit of tamper detection in the ST25TV02KC-T variant, use cases that need to verify the integrity of assets can leverage the enhanced flexibility of Augmented NDEF communication. All devices feature state-of-the-art protection services, which include a 64-bit encrypted password with failed-attempt counter for data safety, TruST25™ digital-signature services to verify die authenticity, and untraceable and kill modes to protect user privacy.

Developers working with the ST25TV512C and ST25TV02KC tags can deliver high-quality solutions to market quickly, taking advantage of ST’s established ST25 ecosystem that includes extensive software libraries, example applications, and reference implementations.

Building on ST’s experience in NFC technology, the tags deliver advantages such as extended communication range with superior reliability. In addition, retaining the same chip capacitance as the previous product generation helps to simplify the design of the antenna. The tags operate from -40°C to 85°C and integrate a configurable EEPROM with 60-year data retention, which is the highest value available among major NFC suppliers.

Features of the ST25TV512C NFC Type 5 / RFID tag IC include:

  • Contactless interface
    • Compliant with ISO/IEC 15693
    • NFC Forum Type 5 tag certified by the NFC Forum
    • Supports all ISO/IEC 15693 modulations, coding, subcarrier modes, and datarates up to 26 Kbit/s
    • Single block reads and writes, multiple block reads
    • Internal tuning capacitance: 23 pF
  • Memory
    • Up to 2560 bits (320 bytes) of EEPROM
    • Accessible by blocks of four bytes
    • Write time from RF: typical 5 ms per block
    • Data retention: 60 years at 55°C
    • Minimum endurance: 100k write cycles
    • 3-digit unique tap code
    • Augmented NDEF (contextual automatic NDEF message)
  • Data protection
    • User memory configurable in one or two areas:
      • in single area mode, access protectable by one 64-bit password
      • in flexible dual area mode, access protectable by two 32-bit passwords
    • System configuration: access protected by a 32-bit password
    • Permanent write lock of specific user area blocks
    • Temporary write lock at user area level
    • Permanent write lock of specific system configuration blocks
  • Product identification and protection
    • Password features: cover coding, recovery, failed attempt counter
    • Tamper detection capability with memorization of open/resealed events
    • TruST25™ digital signature
  • Privacy
    • Configurable kill mode for permanent deactivation of the tag
    • Untraceable mode with configurable responsiveness
  • Temperature range
    • From - 40 to 85 °C

More information on the ST25TV512C NFC Type 5 / RFID tag IC is available on the ST Web site at STMicroelectronics ST25TV512C product page.

1 NFC Type 5 is the NFC-RFID crossover technology that enables both long-range communication with dedicated reader hardware and short-range interaction with a smartphone.


The company's Web site address is www.st.com.
[Reprinted with kind permission from STMicroelectronics - Release Date, 25th January, 2021]