ST25R3920-AQWT STMicroelectronics

ST25R3920 Automotive high performance NFC reader for CCC digital key and car center console Datasheet - production data 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 VFQFPN32 (5x5 mm) modes Adjustable ASK modulation depth, from 5 to 40% Features Integrated regulators to boost system PSRR AEC-Q100 qualified AM/PM and I/Q demodulator with Operating modes baseband channel summation or automatic Reader/writer channel selection Card emulation Possibility to drive two independent single Active and passive peer to peer ended antennas Measurement of antenna voltage amplitude RF communication and phase, RSSI, on-chip supply and EMVCo 3.0 analog and digital compliant regulated voltages NFC-A / ISO14443A up to 848 kbit/s External communication interfaces NFC-B / ISO14443B up to 848 kbit/s 512-byte FIFO NFC-F / FeliCa up to 424 kbit/s Serial peripheral interface (SPI) up to NFC-V / ISO15693 up to 53 kb/s 5 Mbit/s NFC-A / ISO14443A and NFC-F / FeliCa I2C with up to 400 kbit/s in Fast-mode, card emulation 1 Mbit/s in Fast-mode Plus, and 3.4 Mbit/s Active and passive peer to peer initiator in High-speed mode and target modes, up to 424 kbit/s Electrical characteristics Low level modes to implement MIFARE Wide supply voltage and ambient Classic compliant or other custom temperature range (2.6 to 5.5 V from -40 C protocols to +105 C, 2.4 to 5.5 V from -20 C to Key features +105 C) Dynamic power output (DPO) controls the Wide peripheral communication supply field strength to stay within given limits range, from 1.65 to 5.5 V Active wave shaping (AWS) reduces over- Quartz oscillator capable of operating with and under-shoots 27.12 MHz crystal with fast start-up Noise suppression receiver (NSR) allows reception in noisy environment Automatic antenna tuning (AAT) via variable capacitor August 2021 DS13261 Rev 6 1/151 This is information on a product in full production. www.st.comContents ST25R3920 Contents 1 Applications . 11 2 Description 12 2.1 System diagram 13 2.2 Block diagram 15 2.2.1 Transmitter . 15 2.2.2 Receiver . 16 2.2.3 Phase and amplitude detector 16 2.2.4 Automatic antenna tuning (AAT) 16 2.2.5 A/D converter . 16 2.2.6 Capacitive sensor . 16 2.2.7 External field detector 17 2.2.8 Quartz crystal oscillator . 17 2.2.9 Power supply regulators 17 2.2.10 POR and bias 17 2.2.11 RC oscillator and Wake-up timer 17 2.2.12 TX encoding 18 2.2.13 RX decoding . 18 2.2.14 FIFO 18 2.2.15 Control logic 18 2.2.16 Host interface . 18 2.2.17 Passive target memory . 18 2.2.18 P2RAM . 18 3 Pin and signal description . 19 4 Application information . 21 4.1 Power-on sequence . 21 4.2 Operating modes . 21 4.2.1 Transmitter . 21 4.2.2 Receiver . 24 4.2.3 Antenna tuning 29 4.2.4 Capacitive sensor . 29 4.2.5 Wake-up mode 31 2/151 DS13261 Rev 6