Overview
The ST25R3920-AQWT, produced by STMicroelectronics, is an automotive-grade high-performance NFC universal device. It is designed to support various NFC modes, including initiator, target, reader, and card emulation. This device is particularly suited for Car Connectivity Consortium (CCC) digital key applications and can be integrated into car access and start systems, such as door handles or center consoles. The ST25R3920-AQWT is robust, noise tolerant, and reduces electromagnetic emissions, making it ideal for harsh automotive environments. It also supports additional functionalities like pairing, NFC card protection, and integration with Qi chargers.
Key Specifications
| Specification | Details |
|---|---|
| Operating Modes | Reader/writer, Card emulation, Active and passive peer to peer |
| RF Communication | NFC-A / ISO14443A up to 848 kbit/s, NFC-B / ISO14443B up to 848 kbit/s, NFC-F / FeliCa™ up to 424 kbit/s, NFC-V / ISO15693 up to 53 kbit/s |
| Card Emulation | NFC-A / ISO14443A and NFC-F / FeliCa™ |
| Communication Interfaces | SPI up to 5 Mbit/s, I2C up to 3.4 Mbit/s in High-speed mode, 512-byte FIFO |
| Supply Voltage | 2.6 to 5.5 V from -40 °C to +105 °C, 2.4 to 5.5 V from -20 °C to +105 °C |
| Peripheral IO Voltage | From 1.65 to 5.5 V |
| Operating Temperature | -40 °C to +105 °C |
| Package | VFQFPN 5X5X1 32L WETTABLE FLANKS |
| Qualification | AEC-Q100 grade 2 |
Key Features
- Dynamic power output (DPO) to control field strength
- Active wave shaping (AWS) to reduce over- and under-shoots
- Noise suppression receiver (NSR) for reception in noisy environments
- Automatic antenna tuning (AAT) via variable capacitor
- Integrated EMVCo 3.0 compliant EMD handling
- Automatic gain control and squelch feature to maximize SNR
- Low power capacitive and inductive card detection
- Low power NFC active and passive target modes
- Adjustable ASK modulation depth from 5 to 40%
- Integrated regulators to boost system PSRR
- AM/PM and I/Q demodulator with baseband channel summation or automatic channel selection
- Possibility to drive two independent single-ended antennas
- Measurement of antenna voltage amplitude and phase, RSSI, on-chip supply and regulated voltages
Applications
The ST25R3920-AQWT is primarily designed for automotive applications, particularly for CCC digital key systems. It can be used in various car access and start systems such as door handles, center consoles, and other automotive environments where NFC functionality is required. Additionally, it can be integrated into systems that require pairing, NFC card protection, and compatibility with Qi chargers.
Q & A
- What are the primary operating modes of the ST25R3920-AQWT?
The ST25R3920-AQWT supports reader/writer, card emulation, and active and passive peer to peer modes. - What are the supported NFC protocols?
The device supports NFC-A / ISO14443A, NFC-B / ISO14443B, NFC-F / FeliCa™, and NFC-V / ISO15693 protocols. - What is the maximum data rate for NFC-A and NFC-B protocols?
The maximum data rate for NFC-A and NFC-B protocols is up to 848 kbit/s. - What communication interfaces are available?
The device features SPI up to 5 Mbit/s, I2C up to 3.4 Mbit/s in High-speed mode, and a 512-byte FIFO. - What is the operating temperature range of the ST25R3920-AQWT?
The operating temperature range is from -40 °C to +105 °C. - Is the ST25R3920-AQWT AEC-Q100 qualified?
Yes, the ST25R3920-AQWT is AEC-Q100 grade 2 qualified. - What is the package type of the ST25R3920-AQWT?
The package type is VFQFPN 5X5X1 32L WETTABLE FLANKS. - What are some key features of the ST25R3920-AQWT?
Key features include dynamic power output, active wave shaping, noise suppression receiver, and automatic antenna tuning. - Can the ST25R3920-AQWT drive multiple antennas?
Yes, it can drive two independent single-ended antennas. - What is the purpose of the low power capacitive and inductive card detection?
The low power capacitive and inductive card detection allows for card presence detection while minimizing power consumption.
