Overview
The ST25R3911-BQFT is a high-performance HF reader and NFC initiator IC developed by STMicroelectronics. This component is designed to support a wide range of NFC and RFID standards, including ISO 14443, ISO 15693, FeliCa, and NFCIP-1. It is particularly suited for infrastructure applications where optimal RF performance and flexibility are crucial, combined with low power consumption.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | 32-VFQFN Exposed Pad |
| Frequency | 13.56 MHz |
| Standards | FeliCa, ISO 14443, MIFARE, NFC, ISO 15693 |
| Interface | SPI |
| Voltage Supply | 2.4 V ~ 5.5 V |
| Operating Temperature | -40°C ~ 125°C |
| RoHS Status | Lead free / RoHS Compliant |
| Moisture Sensitive | Yes |
| Packing Type | Tape and Reel |
Key Features
- Highly integrated NFC Initiator / HF reader IC with analog front end (AFE) and data framing system.
- Supports VHBR (3.4 Mbit/s PICC to PCD framing) and automatic antenna tuning (AAT) technology.
- Includes two differential low impedance (1 Ohm) antenna drivers.
- Low power capacitive sensor for card presence detection without switching on the reader field.
- Low power RC oscillator and wake-up timer for periodic card presence detection.
- 96-byte FIFO for data handling.
- 4-wire Serial Peripheral Interface (SPI) for communication with external microcontroller.
Applications
- E-government
- Access control
- Payment systems (EMVCo 2.6b)
- NFC infrastructure
- Ticketing
Q & A
- Q: What are the main standards supported by the ST25R3911-BQFT?
A: The ST25R3911-BQFT supports FeliCa, ISO 14443, MIFARE, NFC, and ISO 15693 standards. - Q: What is the operating voltage range of the ST25R3911-BQFT?
A: The operating voltage range is from 2.4 V to 5.5 V. - Q: What is the package type of the ST25R3911-BQFT?
A: The package type is 32-VFQFN Exposed Pad. - Q: Is the ST25R3911-BQFT RoHS compliant?
A: Yes, the ST25R3911-BQFT is RoHS compliant. - Q: What is the purpose of the automatic antenna tuning (AAT) technology in the ST25R3911-BQFT?
A: The AAT technology optimizes the device for applications with directly driven antennas. - Q: How does the ST25R3911-BQFT detect card presence at low power?
A: It uses a low power capacitive sensor, phase measurement, or amplitude measurement to detect card presence. - Q: What is the role of the RC oscillator and wake-up timer in the ST25R3911-BQFT?
A: They are used to schedule periodic card presence detection and wake up the system after a defined time period. - Q: What interface does the ST25R3911-BQFT use for communication with an external microcontroller?
A: It uses a 4-wire Serial Peripheral Interface (SPI). - Q: What is the operating temperature range of the ST25R3911-BQFT?
A: The operating temperature range is from -40°C to 125°C. - Q: What are some typical applications of the ST25R3911-BQFT?
A: Typical applications include e-government, access control, payment systems, NFC infrastructure, and ticketing.
