STMicroelectronics ST25R3916 & ST25R3917 NFC Universal Devices

STMicroelectronics ST25R3916 and ST25R3917 High-Performance NFC Universal Devices support an NFC initiator, NFC target, NFC reader, and NFC card emulation modes, when applicable. Being fully compliant with EMVCo 3.0 analog and digital, these NFC ICs are optimized for POS terminal applications. These devices also enable the fastest EMVCo 3.0 certification cycles possible, even under harsh conditions, with antenna around noisy LCDs. Both devices include an advanced analog front end (AFE) and a highly integrated data framing system for ISO 18092 passive and active initiator. The ST25R3916 and ST25R3917 also have ISO 18092 passive and active target, NFC-A/B (ISO 14443A/B) reader including higher bit rates, NFC-F (FeliCa™) reader, NFC-V (ISO 15693) reader up to 53kbps, and NFC-A / NFC-F card emulation. Special stream and transparent modes of the AFE and framing system can be used to implement other custom protocols in reader or card emulation mode.

The ST25R3916 and ST25R3917 feature high RF output power to directly drive antennas at high efficiency. The SST25R3916 and ST25R3917 include additional features, making them incomparable for low power applications. They contain a low power capacitive sensor to detect the presence of a card without switching on the reader field. Additionally, the presence of a card can still be detected by measuring the amplitude or phase of the antenna signal. They also contain a low power RC oscillator and wake-up timer to automatically wake-up the ST25R3916 or ST25R3917 after a selected time. The user can then check for a presence of a tag using one or more techniques of low power detection of card presence (capacitive, phase or amplitude).

The ST25R3916 and ST25R3917 are designed to operate from a wide power supply range (from 2.4 to 5.5V), and a wide peripheral IO voltage range (from 1.65 to 5.5V). Due to this combination of high RF output power, low power modes, and wide supply range, these devices are perfectly suited for infrastructure NFC applications.

Features

Operating modes
- Reader/writer
- Card emulation
- Active and passive peer-to-peer
Key features
- Dynamic power output (DPO) controls the field strength to stay within given limits
- Active waveshaping (AWS) reduces over and under-shoots
- Noise suppression receiver (NSR) allows reception in a noisy environment
- 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
- 5% to 40% adjustable ASK modulation depth
- 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

RF communication
- EMVCo™ 3.0 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 and NFC-F / FeliCa™ 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
- 512byte FIFO
- Up to 10 Mbit/s serial peripheral interface (SPI)
- I²C with up to 400kbit/s in Fast-mode, 1Mbit/s in Fast-mode Plus, and 3.4Mbit/s in High-speed mode
Electrical characteristics
- 2.4 to 5.5V wide supply voltage range
- 1.65 to 5.5V wide peripheral communication supply range
- Quartz oscillator capable of operating with 27.12MHz crystal with fast start-up