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STMicroelectronics ST25DV-I2C Dynamic NFC Tags

Dynamic NFC/I2C tag ICs combine long range with high-speed data transfer

STMicroelectronics’ ST25DV-I2C series of dynamic tag ICs have dual NFC/RFID and I2C bus interfaces, to provide for untethered interaction between an external NFC smartphone or reader, and a host device’s microcontroller or applications processor.

Compliant with the ISO 15693 communication standard, the ST25DV-I2C NFC/RFID tags support data exchange over an extended wireless communication range at a frequency of 13.56MHz. This capability may be used, for instance, for in-the-box programming of electronic equipment at the point of production. Fast Transfer Mode operation, enabled by a half-duplex 256-byte buffer, also enables software updates in the field via any NFC-enabled mobile device. The ST25DV-I2C dynamic tags are compatible with any existing RFID infrastructure, with no additional investment required.

The ST25DV-I2C NFC tag series complies with the specifications of the NFC Forum Type 5 standard as well as ISO 15693. It also features a large EEPROM capacity of 4kbits, 16kbits or 64kbits, with multiple 64-bit passwords offering enhanced data-protection capabilities. Mutual authentication between the host and the reader or smartphone can be implemented by coupling the ST25DV-I2C with an STM32 microcontroller that supports the Secure Boot/Secure Firmware Update (SBSFU) service.

The STMicroelectronics ST25DV-I2C tags are suitable for use in industrial applications, offering high write-cycle endurance of 1 million cycles at 25°C, and 40 years’ data retention.

ST25DV-I2C Features
  • Interrupt pin configurable on multiple RF events
  • Supply-voltage range: 1.8V-5.5V
  • Energy-harvesting via Analog Output pin to power external components
  • Maximum temperature:
    • 125°C for SO8N and TSSOP8 packages
    • 105°C at the RF interface
ST25DV-I2C Applications
  • Smart meters
  • IoT devices
  • Professional products
  • Consumer devices
  • Industrial equipment
  • Battery-powered products
  • Electronic shelf labels

Development Boards

This ST25DV-DISCOVERY demonstration kit consists of a ST25DV04K NFC interface tag embedded on a daughtercard using a Class 5 antenna, and an STM32 processor driving a motherboard. Dedicated application software is stored in Flash memory.

The X-NUCLEO-NFC04A1 expansion board, based on an ST25DV04K NFC interface tag, and featuring a 54mm diameter circular antenna, can be used in combination with the STM32 NUCLEO boards, thus offering more flexibility in the development process.