Overview
The ST25R3912-AQWT is a highly integrated NFC initiator and HF reader IC developed by STMicroelectronics. This device is designed to provide optimal RF performance and flexibility, combined with low power consumption, making it ideal for various NFC and RFID applications. It includes an analog front end (AFE) and a highly integrated data framing system, supporting multiple standards such as ISO 18092 (NFCIP-1) initiator, ISO 18092 (NFCIP-1) active target, ISO 14443A and B reader, ISO 15693 reader, and FeliCa™ reader. The ST25R3912-AQWT is particularly suited for infrastructure-side NFC systems and applications requiring directly driven antennas.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 32-pin VFQFPN (5mm x 5mm) with wettable flanks |
| Supply Voltage Range | 2.4V to 5.5V |
| Operating Temperature Range | -40°C to 125°C |
| Frequency | 13.56 MHz or 27.12 MHz crystal with fast start-up |
| Bit Rate | Up to 848 kbit/s PICC to PCD and PCD to PICC framing |
| Interface | 6 Mbit/s SPI with 96 bytes FIFO |
| Antenna Drivers | Two differential low impedance (1 Ohm) antenna drivers |
Key Features
- Supports ISO 18092 (NFCIP-1) Active P2P, ISO14443A, ISO14443B, ISO15693, and FeliCa™
- High bit rate (HBR) up to 848 kbit/s PICC to PCD and PCD to PICC framing
- Inductive sensing - wake-up
- Automatic modulation index adjustment
- AM and PM (I/Q) demodulator channels with automatic selection
- User selectable and automatic gain control
- Transparent and Stream modes to implement MIFARE™ Classic compliant or other custom protocols
- Possibility of driving two antennas in single ended mode
- Low power RC oscillator and wake-up timer
Applications
The ST25R3912-AQWT is suitable for a wide range of applications, including:
- NFC infrastructure systems
- RFID readers and writers
- Public transportation ticketing systems
- Access control systems
- Smart home and IoT devices
- Healthcare and medical devices
Q & A
- What is the operating temperature range of the ST25R3912-AQWT?
The operating temperature range is -40°C to 125°C.
- What is the supply voltage range for the ST25R3912-AQWT?
The supply voltage range is 2.4V to 5.5V.
- What protocols does the ST25R3912-AQWT support?
The device supports ISO 18092 (NFCIP-1), ISO 14443A and B, ISO 15693, and FeliCa™ protocols.
- What is the maximum bit rate supported by the ST25R3912-AQWT?
The maximum bit rate is up to 848 kbit/s PICC to PCD and PCD to PICC framing.
- Does the ST25R3912-AQWT support low power modes?
Yes, it includes a low power RC oscillator and wake-up timer, and supports low power detection techniques.
- What type of antenna drivers does the ST25R3912-AQWT have?
The device has two differential low impedance (1 Ohm) antenna drivers.
- What is the interface speed of the SPI interface on the ST25R3912-AQWT?
The SPI interface operates at 6 Mbit/s with a 96 bytes FIFO.
- Can the ST25R3912-AQWT implement custom protocols?
Yes, it can implement custom protocols using the AFE and framing in the external microcontroller (Stream and Transparent modes).
- What is the package type of the ST25R3912-AQWT?
The package type is 32-pin VFQFPN (5mm x 5mm) with wettable flanks.
- Is the ST25R3912-AQWT RoHS compliant?
Yes, the ST25R3912-AQWT is RoHS compliant with an Ecopack2 grade.
