Overview
The ST25R3911B-AQFT is a highly integrated High Frequency (HF) reader and Near Field Communication (NFC) initiator IC developed by STMicroelectronics. This component is designed to operate within a wide power supply range of 2.4 V to 5.5 V, making it versatile for various applications. It features an automatic antenna tuning (AAT) system, which optimizes the device for applications with directly driven antennas. The ST25R3911B-AQFT supports multiple NFC and RFID standards, including ISO 14443A and B, ISO 15693, and FeliCa™, making it suitable for a broad range of infrastructure and reader applications.
Key Specifications
| Type | Description |
|---|---|
| Clock Frequency-Max | 13.56 MHz / 27.12 MHz |
| Supply Current | 8.7 mA |
| Supply Voltage | 2.4 V to 5.5 V |
| Package Style | QFN-32 |
| Mounting Method | Surface Mount |
| Temperature Range | -40 °C to 125 °C |
| Interface | 6 Mbit/s SPI with 96 bytes FIFO |
Key Features
- Automatic Antenna Tuning (AAT): Optimizes the device for applications with directly driven antennas.
- Multi-Protocol Support: Supports ISO 14443A and B, ISO 15693, FeliCa™, and NFCIP-1 initiator and active target modes.
- Low Power Detection: Includes a low power capacitive sensor to detect the presence of a card without switching on the reader field.
- High Performance: Features differential low impedance (1 Ohm) antenna drivers and supports Very High Bit Rates (VHBR).
- Flexible Power Supply: Operates from a wide power supply range of 2.4 V to 5.5 V, with IO pins supporting 1.65 V to 5.5 V.
- Integrated A/D Converter: Built-in analog to digital converter for various measurements such as RF amplitude and phase.
Applications
- E-government: Suitable for secure identification and authentication in government applications.
- Access Control: Used in access control systems for secure entry and exit management.
- Payment Systems: Compliant with EMVCo 2.6b standards for secure payment transactions.
- NFC Infrastructure: Ideal for NFC-enabled infrastructure such as public transportation and ticketing systems.
- Ticketing: Used in various ticketing applications requiring secure and efficient data exchange).
Q & A
- What is the operating voltage range of the ST25R3911B-AQFT?
The ST25R3911B-AQFT operates from a wide power supply range of 2.4 V to 5.5 V).
- What are the supported communication protocols?
The device supports ISO 14443A and B, ISO 15693, FeliCa™, and NFCIP-1 initiator and active target modes).
- What is the purpose of the automatic antenna tuning (AAT) system?
The AAT system optimizes the device for applications with directly driven antennas, ensuring optimal RF performance).
- How does the low power detection feature work?
The low power capacitive sensor detects the presence of a card without switching on the reader field, using measurements of capacitance, amplitude, or phase of the signal on the antenna LC tank).
- What is the maximum clock frequency of the ST25R3911B-AQFT?
The maximum clock frequency is 13.56 MHz or 27.12 MHz).
- What is the package style and mounting method of the ST25R3911B-AQFT?
The package style is QFN-32, and the mounting method is surface mount).
- What is the temperature range of the ST25R3911B-AQFT?
The device operates within a temperature range of -40 °C to 125 °C).
- Does the ST25R3911B-AQFT support high bit rates?
Yes, it supports Very High Bit Rates (VHBR)).
- What interface does the ST25R3911B-AQFT use for communication?
The device uses a 6 Mbit/s SPI interface with a 96 bytes FIFO).
- Is the ST25R3911B-AQFT suitable for low power applications?
Yes, it includes several features such as a low power RC oscillator and wake-up timer, making it suitable for low power applications).
