Overview
The ST25R3912-AWLT, produced by STMicroelectronics, is a highly integrated NFC initiator and HF reader IC. It is designed to operate in a wide range of applications, particularly on the infrastructure side of NFC systems, where optimal RF performance and flexibility combined with low power consumption are crucial. The device includes an analog front end (AFE) and a highly integrated data framing system, supporting various NFC and RFID standards such as ISO 18092 (NFCIP-1), ISO 14443A and B, ISO 15693, and FeliCa™. It is optimized for applications with directly driven antennas and features two differential low impedance (1 Ohm) antenna drivers, making it unique in the domain of HF reader ICs.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage Min | 2.4 V |
| Supply Voltage Max | 5.5 V |
| Operating Temperature Min | -40 °C |
| Operating Temperature Max | 125 °C |
| Output Power | Up to 1 W (differential output) |
| Communication Standards | ISO 18092 (NFCIP-1), ISO 14443A and B, ISO 15693, FeliCa™ |
| Bit Rate | Up to 848 kbit/s PICC to PCD and PCD to PICC framing |
| Interface | 6 Mbit/s SPI with 96 bytes FIFO |
| Package | VFQFPN32 (5 mm x 5 mm), WLCSP (3.0 mm x 2.8 mm) |
| ECCN US | EAR99 |
| ECCN EU | NEC |
Key Features
- Supports ISO 18092 (NFCIP-1) Active P2P, ISO 14443A and B, ISO 15693, and FeliCa™
- High bit rate (HBR) up to 848 kbit/s PICC to PCD and PCD to PICC framing
- Inductive sensing and wake-up capabilities
- 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
- Oscillator input capable of operating with 13.56 or 27.12 MHz crystal with fast start-up
- Low power RC oscillator and wake-up timer
Applications
The ST25R3912-AWLT is primarily designed for payment applications and other infrastructure-side NFC systems. It is suitable for use in various environments where optimal RF performance, flexibility, and low power consumption are essential. This includes but is not limited to:
- Payment terminals
- Public transportation systems
- Access control systems
- Smart home devices
- Industrial automation
Q & A
- What is the ST25R3912-AWLT?
The ST25R3912-AWLT is a highly integrated NFC initiator and HF reader IC produced by STMicroelectronics.
- What are the supported communication standards?
The device supports ISO 18092 (NFCIP-1), ISO 14443A and B, ISO 15693, and FeliCa™.
- What is the output power of the ST25R3912-AWLT?
The device can output up to 1 W in differential mode.
- What are the operating temperature ranges for the ST25R3912-AWLT?
The operating temperature range is from -40 °C to 125 °C.
- What interface does the ST25R3912-AWLT use?
The device uses a 6 Mbit/s SPI interface with a 96 bytes FIFO.
- Is the ST25R3912-AWLT RoHS compliant?
No, the ST25R3912-AWLT is not flagged as RoHS compliant.
- What are the available packages for the ST25R3912-AWLT?
The device is available in VFQFPN32 (5 mm x 5 mm) and WLCSP (3.0 mm x 2.8 mm) packages.
- How does the ST25R3912-AWLT detect the presence of a card?
The presence of a card can be detected by measuring the amplitude or phase of the signal on the antenna LC tank and comparing it to a stored reference.
- What are the power supply voltage ranges for the ST25R3912-AWLT?
The device operates from a wide power supply range of 2.4 to 5.5 V, with peripheral interface IO pins supporting a range from 1.65 to 5.5 V.
- Where can I find additional documentation and support for the ST25R3912-AWLT?
Additional datasheets, footprints, and schematics can be found on the STMicroelectronics website and through authorized distributors such as Newark Electronics, element14, and Avnet America.
