STMicroelectronics ST25R3920B Automotive NFC Reader
STMicroelectronics ST25R3920B Automotive NFC Reader is a high-performance NFC universal device supporting NFC initiator, NFC target, NFC reader, and NFC card emulation modes. Designed for CCC (Car Connectivity Consortium) digital key applications, the ST25R3920B enables fast product development for car access and start applications. The device also enables additional functionality, like pairing or NFC card protection combined with a Qi charger. Being very robust and noise tolerant while at the same time reducing electromagnetic emission, the device works even under harsh conditions, enabling an easier certification.
The ST25R3920B includes an advanced analog front end (AFE) and a highly integrated data framing system for ISO18092 passive and active initiator, ISO 18092 passive and active target, NFC-A/B (ISO14443A/B) reader including higher bit rates, NFC-F (FeliCa™) reader, NFC-V (ISO15693) reader up to 53kbps, and NFC-A/NFC-F card emulation. Special stream and transparent modes of the AFE and framing system are used to implement other custom protocols in the reader or card emulation modes.
The ST25R3920B features high RF power with dynamic power output to directly drive antennas at high efficiency, achieving large interaction distance even with small antenna sizes common in door handles. The device also includes energy-saving features, making it ideal for low-power applications. The ST25R3920B offers low power card detection by measuring the amplitude or phase of the antenna signal while reducing power consumption to a minimum.
The ST25R3920B is designed to operate from a 2.6V to 5.5V wide power supply range and a wide 1.65V to 5.5V peripheral IO voltage range.
The STMicroelectronics ST25R3920B Automotive NFC Reader is offered in a VFQFPN32 package with wettable flanks for easy Automated Optical Inspection (AOI). This device is AEC-Q100 qualified for use in automotive applications.
Features
- AEC-Q100 qualified
- Operating modes
- Reader/writer
- Card emulation
- Active and passive peer to peer
- RF communication
- EMVCo® 3.1a analog and digital compliant
- NFC-A/ISO14443A up to 848kbit/s
- NFC-B/ISO14443B up to 848kbit/s
- NFC-F/FeliCa up to 424kbit/s
- NFC-V/ISO15693 up to 53kb/s
- NFC-A/ISO14443A (106kbit/s) and NFC-F/FeliCa (212/424kbit/s) card emulation
- Active and passive peer-to-peer initiator and target modes, up to 424kbit/s
- Low-level modes to implement MIFARE Classic® compliant or other custom protocols
- External communication interfaces
- 512-byte FIFO
- Serial peripheral interface (SPI) up to 5Mbit/s
- I2C with up to 400 kbit/s in Fast-mode, 1Mbit/s in Fast-mode Plus, and 3.4Mbit/s in High-speed mode
- Electrical characteristics
- Wide supply voltage and ambient temperature range
- 2.6V to 5.5V from -40°C to +105°C
- 2.4V to 5.5V from -20°C to +105°C
- Wide peripheral communication supply range, from 1.65V to 5.5V
- Quartz oscillator capable of operating with 27.12MHz crystal with fast start-up
- Key features
- Dynamic power output (DPO) controls the field strength to stay within given limits
- Active wave shaping (AWS) reduces over-and under-shoots
- Noise suppression receiver (NSR) allows reception in noisy environments
- Automatic antenna tuning (AAT) via variable capacitor
- Integrated EMVCo 3.1a compliant EMD handling
- Automatic gain control and squelch feature to maximize SNR
- Low power NFC active and passive target modes
- Adjustable ASK modulation depth, from 0 to 82%
- 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
- Package information
- 5.0mm x 5.0mm VFQFPN32 package with exposed pad
- Wettable flanks for AOI
- 0.5mm pitch
Applications
- Vehicle access
- Vehicle starting
- NFC card protection on center console Qi chargers
- Phone pairing and data transfer
- Consumable authentication
- In-vehicle payment
Videos
Application Example
Related Products
STMicroelectronics ST25R3920 Automotive NFC Reader
AEC-Q100 qualified Near Field Communication IC, designed for CCC digital key applications.
STMicroelectronics ST25R High Performance NFC/RFID Readers
HF and NFC reader solutions that reduce design complexity and cost.
Complete Your Design
STMicroelectronics Standard Products
A broad range of drop-in replacements for general-purpose analog ICs, discretes, and serial EEPROMs.