NTAG I²C Plus 2K: NFC Forum Type 2 Tag with I²C Interface

NTAG_I2C

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The NTAG I2C plus combines a passive NFC interface with a contact I2C interface. Designed to be an enabler for NFC in home-automation and consumer applications, this connected NFC tag is a fast, cost effective way to add tap-and-go connectivity to just about any electronic device.

These devices maintain full backward compatibility with first-generation NTAG I2C while adding advanced features for password protection, a full memory-access configuration from both interfaces, and an originality signature for protection against cloning.

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Product Details

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Block Diagram

Contactless and contact system

Contactless and contact system
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Features

Key features

  • Pass-through mode
    • Up to 40 kbit/s using 64 byte SRAM buffer
  • Energy harvesting
    • Up to 15 mW
    • Wake up host with field detect pin
  • Password protection
    • 32-bit password to restrict access to EEPROM and SRAM
  • Originality signature
    • 32-byte elliptic curve based originality signature to protect cloning

NFC interface

  • Interoperability
    • Fully ISO/IEC 14443 A compliant
    • Fully NFC Forum Type 2 Tag compliant
    • One to one backward compatible to NTAG I2C
  • Uniqueness
    • 7-byte Unique Identifier (according to ISO/IEC 14443-3)
    • GET_VERSION command for easy identification of chip type and supported features
    • 32-byte originality signature
  • ISO/IEC 14443 and NFC Forum Type 2 Tag features
    • Operating distance up to 100 mm
    • True anti-collision
    • 4-byte write operation in < 4.8 ms to EEPROM and < 0.8 ms to SRAM
    • 64-byte write operation (FAST_WRITE) in < 6.1ms to SRAM

I2C interface

  • Features
    • I2C target interface supports up to 400 kHz
    • 16-byte write operation in < 4.5 ms to EEPROM and < 0.4 ms to SRAM
    • This device may be used as standard I2C EEPROM or I2C SRAM

Security

  • NFC Forum Type 2 Tag features
    • 7-byte Unique Identifier
    • One time programmable Capability Container
    • Read-only locking
  • Special features
    • Elliptic curve based originality signature
    • 32-bit password protection
    • Protected data can be safeguarded against a limited number of negative password authentication attempts
    • Access restriction from an I2C perspective
    • Pass-through and mirror mode operations may be password protected

Memory

  • Built-in memory
    • 1912 or 888-bytes freely available user memory area
    • 64-bytes SRAM
  • Specification
    • 20 years of data retention
    • 500.000 write cycles

Connection Modes

Direct Power Source

Direct Power Source

Alternatively, the power harvested by the NTAG I2C tag chip can also be applied directly as a source of power for devices requiring less energy, such as low power microcontrollers, sensors, and indicators.

Energy Harvesting

Energy Harvesting

The NTAG I2C tag chip’s energy harvesting capability and Field Detect (FD) functions work together to help support power management. Upon application of the RF field to the antenna, the FD output asserts low, and the energy harvested by the NTAG I2C tag chip from the RF field is output (VOUT) to a Power Management Unit (PMU) (1). The PMU distributes received power to both the NTAG I2C tag chip and the microcontroller (2), which allows the I2C bus to become active (3), enabling communication.

Pass-through Mode using SRAM (Device-Powered Mode)

Pass-through Mode using SRAM (Device-Powered Mode)

For data transfer after communication has been initiated, the on-chip, 64-byte SRAM preserves EEPROM access limits by supporting a data pass-through option. In this case, data flows from the NFC interface through an SRAM buffer to the I2C serial bus interface or vice versa. The NTAG I2C tag chip operates as a modem when in this mode.

Data Transfer Mode using EEPROM (Passive/Static Mode)

Data Transfer Mode using EEPROM (Passive/Static Mode)

When manufacturers embed the NTAG I2C tag chip into products, users can download information via the RF interface to those products even when they are not receiving power, because the NTAG I2C tag chip acts as a connection between the user’s NFC-enabled mobile device and the sealed and packaged product.

With a power to the device off, the contactless NFC interface can still operate, receiving data that the NTAG I2C tag chip stores in nonvolatile EEPROM memory. Later, when the device has power, the microprocessor can access the previously written data via the I2C serial bus interface. Similarly, the microprocessor can write data to the EEPROM while powered for later access via the NFC interface whether or not the device has power.

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