Item specifics
Description
ST25R3920B-AQWT Product Overview
The ST25R3920B-AQWT is an automotive-grade high-performance NFC universal device from STMicroelectronics, specifically designed for CCC (Car Connectivity Consortium) digital key applications. The ST25R3920B-AQWT supports multiple operating modes including NFC initiator, NFC target, NFC reader/writer, and NFC card emulation, making it suitable for car access and start applications in door handles and center consoles. The ST25R3920B-AQWT is housed in a VFQFN-32 package (5×5mm, 0.5mm pitch), is AEC-Q100 Grade 2 qualified, and operates over a temperature range of -40℃ to +105℃ with a supply voltage of 2.6V to 5.5V.
ST25R3920B-AQWT Core Features
The ST25R3920B-AQWT integrates an advanced analog front end (AFE) and a highly integrated data framing system supporting multiple NFC protocols. The ST25R3920B-AQWT supports NFC-A/ISO14443A and NFC-B/ISO14443B reader modes (up to 848 kbit/s), NFC-F/FeliCa™ reader mode (up to 424 kbit/s), NFC-V/ISO15693 reader mode (up to 53 kbit/s), as well as NFC-A and NFC-F card emulation modes.
The ST25R3920B-AQWT features advanced capabilities: Dynamic Power Output (DPO) controls field strength within given limits; Active Wave Shaping (AWS) reduces over- and undershoots; Noise Suppression Receiver (NSR) enables reception in noisy environments; Automatic Antenna Tuning (AAT) via variable capacitor; Integrated EMVCo® PCD L1 v3.2a-compliant EMD handling; Adjustable ASK modulation depth (0 to 82%); I2C (up to 3.4 Mbit/s) and SPI (up to 5 Mbit/s) communication interfaces; and a 512-byte FIFO buffer.
ST25R3920B-AQWT Applications
The ST25R3920B-AQWT is widely used in automotive digital key systems: keyless entry in door handles, keyless start in center consoles, Qi wireless charging NFC card protection, and smartphone pairing and data transfer. The ST25R3920B-AQWT can also be used in EMVCo 3.1a-compliant contactless payment terminals, ISO14443/ISO15693 general-purpose NFC devices, FeliCa™ readers/writers, and other general NFC applications.
ST25R3920B-AQWT Key Advantages
Automotive-Grade Qualification for Reliability： The ST25R3920B-AQWT is AEC-Q100 Grade 2 qualified with an operating temperature range of -40℃ to +105℃, suitable for harsh automotive environments. The ST25R3920B-AQWT features excellent noise immunity and reduced electromagnetic emissions, simplifying the certification process even under harsh conditions.
High Output Power for Extended Interaction Range： The ST25R3920B-AQWT delivers up to 1.6W output power. Combined with outstanding receiver sensitivity, the ST25R3920B-AQWT achieves maximum communication range even with small antennas commonly used in space-constrained locations like door handles.
Dynamic Power Output & Active Wave Shaping： The ST25R3920B-AQWT features DPO technology that automatically adjusts output power based on antenna detuning caused by different antenna sizes and distances, keeping transmit power within NFC Forum safety limits. The ST25R3920B-AQWT also features AWS technology that helps meet CCC digital key requirements for signal overshoot and undershoot limits.
Low-Power Card Detection： The ST25R3920B-AQWT features low-power card detection by measuring antenna signal amplitude or phase to detect cards or phones while minimizing power consumption.
Heartbeat Protection Algorithm： The ST25R3920B-AQWT features ST's proprietary Heartbeat protection algorithm, which protects NFC cards in Qi wireless charging applications by distinguishing between NFC cards and phones in card emulation mode.
Comprehensive Software Ecosystem Support： The ST25R3920B-AQWT comes with ST's advanced NFC software library (RFAL), fully compliant with NFC Forum CR13 requirements, including CCC code and phone OEM requirements.
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FAQ
1. What is ST25R3920B-AQWT?
The ST25R3920B-AQWT is an automotive-grade, high-performance NFC reader IC from STMicroelectronics. The ST25R3920B-AQWT is a highly integrated NFC universal device that supports multiple modes including NFC initiator, target, reader, and card emulation.
2. What are the key specifications of ST25R3920B-AQWT?
Frequency: The ST25R3920B-AQWT operates at 13.56 MHz
Supported Protocols: The ST25R3920B-AQWT supports ISO 14443A/B, FeliCa, ISO 15693, MIFARE, etc.
Interfaces: The ST25R3920B-AQWT provides I2C (up to 3.4 Mbit/s) and SPI (up to 5 Mbit/s)
Supply Voltage: The ST25R3920B-AQWT operates from 2.6V to 5.5V
Operating Temperature: The ST25R3920B-AQWT works from -40°C to +105°C
3. What package does ST25R3920B-AQWT use?
The ST25R3920B-AQWT comes in a VFQFPN-32 package (5mm x 5mm). The ST25R3920B-AQWT package features wettable flanks for easy Automated Optical Inspection (AOI).
4. What applications is ST25R3920B-AQWT suitable for?
The ST25R3920B-AQWT primary application is in automotive digital key systems, installed in door handles or the center console for keyless entry and start. The ST25R3920B-AQWT is also used for NFC card protection during Qi wireless charging and Bluetooth pairing.
5. What development tools support ST25R3920B-AQWT?
ST provides middleware (STSW-ST25RFAL002) to accelerate ST25R3920B-AQWT application development. An antenna matching tool (STSW-ST25R004) is also available to simplify ST25R3920B-AQWT antenna design. For hardware prototyping, the X-NUCLEO-NFC08A1 shield can be used with the ST25R3920B-AQWT.
6. What is the operating temperature range of ST25R3920B-AQWT?
As an automotive-grade chip, the ST25R3920B-AQWT is AEC-Q100 qualified and operates across a temperature range of -40°C to +105°C.
7. What are the key features of ST25R3920B-AQWT?
Robust Noise Immunity: The ST25R3920B-AQWT features a Noise Suppression Receiver (NSR) for stable operation in noisy environments.
Smart Antenna Tuning: The ST25R3920B-AQWT supports Dynamic Power Output (DPO) and Automatic Antenna Tuning (AAT) for optimal read range and efficiency.
Exclusive Heartbeat Protection: The ST25R3920B-AQWT protects NFC cards during wireless charging.
Low-Power Wake-Up: The ST25R3920B-AQWT supports inductive low-power wake-up for key detection.
8. What communication protocols and standards does ST25R3920B-AQWT support?
The ST25R3920B-AQWT supports a wide range of NFC protocols and standards:
NFC-A / ISO14443A: The ST25R3920B-AQWT supports up to 848 kbit/s
NFC-B / ISO14443B: The ST25R3920B-AQWT supports up to 848 kbit/s
NFC-F / FeliCa™: The ST25R3920B-AQWT supports up to 424 kbit/s
NFC-V / ISO15693: The ST25R3920B-AQWT supports up to 53 kbit/s
The ST25R3920B-AQWT is compliant with EMVCo® 3.1a standard
The ST25R3920B-AQWT supports low-level modes for MIFARE Classic® or other custom protocols
9. What are the alternative models for ST25R3920B-AQWT?
Within the same family, the ST25R3916B/ST25R3917B are also high-performance NFC reader ICs. Additionally, third-party sources list CR95HF-VMD5T and ST25R3918-AQWT as potential alternatives or similar parts to the ST25R3920B-AQWT.
10. What peripheral interfaces does ST25R3920B-AQWT support?
Main Communication Interfaces: The ST25R3920B-AQWT provides I2C (Fast-mode Plus up to 1 Mbit/s, High-speed mode up to 3.4 Mbit/s) and SPI (up to 5 Mbit/s).
Antenna Interface: The ST25R3920B-AQWT is capable of driving two independent single-ended antennas.
Data Buffer: The ST25R3920B-AQWT features a 512-byte FIFO buffer.