The ST25D Dynamic NFC Tag family is ideal to enable intuitive device control. A simple tap is all it takes to wirelessly trigger an interaction from a smartphone or an NFC-enabled device. Suitable for both consumer and industrial applications, the ST25D Dynamic Tag family meets the latest NFC Forum standards and features three series: mainstream, application-specific, and secure.
What is an ST25 Dynamic NFC tag?
A ST25 dynamic NFC tag is a battery-free solution. Combined with an antenna, it operates by harvesting energy from the magnetic field generated by the NFC/RFID reader (such as a smartphone). It acts as a bridge to create wireless interactions between a smartphone and the system. The dynamic tag can be connected to the system either via I2C or PWM interfaces.
Product types
General purpose.
- NFC Forum Type 5
- I2C interface
- Fast transfer more
- Energy harvesting
- Configurable GPO
- Industrial grade
- NFC Forum Type 4
Specific outputs and features.
- NFC Forum Type 5
- Multiple PWM outputs
- TruST25 digital signature
Turnkey security features.
- NFC Forum Type 4
- I2C interface
- Matter commissioning over NFC
- Secure services with crypto graphic functions
Applications
Benefits
- Enhanced user experience through intuitive interactions
- Robust security with hardware and software protection mechanisms
- High data transfers up to 848 kbps in contactless mode
- Reliable data retention enabled by high-performance non-volatile memory
- Improved energy efficiency thanks to multiple flexible interrupt options
- Simplified implementation and reduced BOM with dedicated key features
- Optimized board design supported by a wide range of package options
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Useful information
WHAT IS TruST25 DIGITAL SIGNATURE? This in-house industrialization process ensures die authenticity provided by STMicroelectronics to help fight counterfeiting. 
WHAT IS ENERGY HARVESTING? When an electromagnetic field is detected, the chip transforms the inducted energy into an electrical current to supply the tag IC and the MCU. 
WHAT IS FAST TRANSFER MODE (FTM)? Using a dedicated 256-byte mailbox buffer, the FTM allows fast exchanges between RF and I2C domains, accessible from both. 
WHAT IS GPO? A general-purpose output delivers configurable interrupt capabilities with multiple drive options. 
WHAT IS PWM OUTPUT? Standing for Pulse Width Modulation, it generates variable duty cycles for system control. Commonly used in lightning and power-supply applications... 
WHAT IS MATTER COMMISSIONING OVER NFC? Interoperable way to commission any smart home device with a simple NFC tap compliant with CSA security requirements.