STMicroelectronics ST25R3920B-AQWT

The ST25R3920B-AQWT, produced by STMicroelectronics, is an automotive-grade high-performance NFC universal device. It supports multiple NFC modes, including NFC initiator, NFC target, NFC reader, and NFC card emulation. Designed specifically for Car Connectivity Consortium (CCC) digital key applications, this device facilitates fast product development for car access and start systems, particularly in areas such as door handles or center consoles. It also enables additional functionalities like pairing or NFC card protection combined with a Qi charger. The device is robust, noise-tolerant, and reduces electromagnetic emissions, making it suitable for harsh automotive environments and easier certification processes.

• AEC-Q100 qualified for automotive applications
• Supports NFC initiator, NFC target, NFC reader, and NFC card emulation modes
• EMVCo 3.1a analog and digital compliant
• NFC-A / ISO14443A up to 848 kbit/s, NFC-B / ISO14443B up to 848 kbit/s, NFC-F / FeliCa™ up to 424 kbit/s, and NFC-V / ISO15693 up to 53 kbit/s
• Active and passive peer to peer initiator and target modes up to 424 kbit/s
• Low power NFC active and passive target modes
• Dynamic power output (DPO) and active wave shaping (AWS) for field strength control and reduced over/under-shoots
• Noise suppression receiver (NSR) for 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
• 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
• External communication interfaces: 512-byte FIFO, SPI up to 5 Mbit/s, I2C up to 3.4 Mbit/s

The ST25R3920B-AQWT is primarily designed for automotive applications, particularly for Car Connectivity Consortium (CCC) digital key and car center console systems. It is suitable for use in door handles, center consoles, and other car access/start systems. Additionally, it can be used in applications that require NFC card protection combined with a Qi charger.

1. What are the primary operating modes of the ST25R3920B-AQWT?

   The ST25R3920B-AQWT supports NFC initiator, NFC target, NFC reader, and NFC card emulation modes.

2. What is the supply voltage range for the ST25R3920B-AQWT?

   The supply voltage range is from 2.4 V to 5.5 V.

3. What is the operating temperature range for the ST25R3920B-AQWT?

   The operating temperature range is from -40 °C to +105 °C.

4. Is the ST25R3920B-AQWT AEC-Q100 qualified?

   Yes, the ST25R3920B-AQWT is AEC-Q100 qualified for automotive applications.

5. What NFC protocols does the ST25R3920B-AQWT support?

   The device supports NFC-A / ISO14443A, NFC-B / ISO14443B, NFC-F / FeliCa™, and NFC-V / ISO15693 protocols.

6. What are the key features of the ST25R3920B-AQWT's RF communication capabilities?

   Key features include dynamic power output, active wave shaping, noise suppression receiver, and automatic antenna tuning.

7. Does the ST25R3920B-AQWT support low power modes?

   Yes, it supports low power NFC active and passive target modes.

8. What external communication interfaces does the ST25R3920B-AQWT offer?

   The device offers SPI up to 5 Mbit/s, I2C up to 3.4 Mbit/s, and a 512-byte FIFO.

9. Is the ST25R3920B-AQWT RoHS compliant?

   Yes, it is RoHS compliant with Ecopack2 certification.

10. What is the package type of the ST25R3920B-AQWT?

    The package type is VFQFPN 5X5X1 32L WETTABLE FLANKS.

11. Can the ST25R3920B-AQWT drive multiple antennas?

    Yes, it can drive two independent single-ended antennas.