NTAG I2C Plus
The NXP NTAG I2C Plus is an NFC tag IC, with 1k bytes (NT3H2111) or 2k bytes (NT3H2211) EEPROM user memory, 64 bytes SRAM buffer, operating at 13.56 MHz, under ISO/IEC 14443-A NFC Forum Type 2 Tag (Certification ID: 58514).
NFC + I2C bridge, 1K/2K EEPROM, energy harvesting
Full Specifications
| Manufacturer | NXP |
|---|---|
| Frequency Category | NFC |
| Frequency | 13.56 MHz |
| Protocol | ISO/IEC 14443-A, NFC Forum Type 2 Tag (Certification ID: 58514) |
| Memory | 1k bytes (NT3H2111) or 2k bytes (NT3H2211) EEPROM user memory, 64 bytes SRAM buffer |
| Interface | RF (contactless NFC), I2C slave (up to 400 kHz) |
| Temperature Range | -40°C to +105°C |
| Form Factor | XQFN8 (SOT902-3, 1.6x1.6x0.5mm), TSSOP8 (SOT505-1), SO8 (SOT96-1) |
| Security | 32-bit password protection, ECC-based originality signature, configurable memory access control, negative authentication attempt limiting |
Engineering Brief
The NTAG I2C Plus (NT3H2111/2211) is a second-generation NFC-I2C bridge IC combining a passive NFC Forum Type 2 Tag interface (ISO/IEC 14443-A) with a contact I2C slave interface. It features 1K or 2K bytes of EEPROM, a 64-byte SRAM buffer for pass-through data transfer, and energy harvesting capability providing up to 5mA at 2V from the NFC field. Enhanced security includes 32-bit password protection, ECC-based originality signature, configurable memory access control from both interfaces, and field detection output for event signaling and synchronization.
Typical Applications
Standards & Compliance
Frequently Asked Questions
What memory sizes are available for the NTAG I2C Plus?
The NTAG I2C Plus is available in two variants: NT3H2111 with 1K bytes (1024 bytes) and NT3H2211 with 2K bytes (2048 bytes) of EEPROM user memory. Both variants include a 64-byte SRAM buffer for pass-through communication between the NFC and I2C interfaces.
Can the NTAG I2C Plus power a microcontroller from NFC field energy?
Yes, the NTAG I2C Plus features energy harvesting capability that provides up to 5mA at 2V from the NFC RF field. This power can be used to supply low-power microcontrollers or sensors when an NFC reader is in proximity.
What is the difference between NTAG I2C and NTAG I2C Plus?
The NTAG I2C Plus is the second-generation version with enhanced security features including ECC-based originality signature, negative authentication attempt limiting, and improved configurable memory access control from both NFC and I2C interfaces.
What security features does the NTAG I2C Plus offer?
The NTAG I2C Plus includes 32-bit password protection, ECC-based originality signature for product authentication, configurable memory access control from both NFC and I2C interfaces, and negative authentication attempt limiting to prevent brute-force attacks.
How fast is the I2C interface on the NTAG I2C Plus?
The NTAG I2C Plus operates as an I2C slave device supporting speeds up to 400 kHz (Fast-mode I2C). This allows efficient communication with microcontrollers and other I2C master devices.
What is the 64-byte SRAM buffer used for in NTAG I2C Plus?
The 64-byte SRAM buffer enables pass-through data transfer between the NFC RF interface and the I2C interface, allowing real-time bidirectional communication without writing to EEPROM. This is useful for dynamic data exchange and sensor readings.
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Cross-manufacturer alternatives
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