The ST25R3916B, ST25R3917B, and ST25R3919B (hereafter referred to as ST25R39xxB) are high-performance NFC universal devices. They support NFC initiator, NFC target, NFC reader, and NFC card emulation modes when applicable.

Designed to be compliant with EMVCo PCD L1 3.2a analog and digital, these devices are optimized for POS terminal applications. They enable fast EMVCo certification cycles, even under harsh conditions, with antenna around noisy LCD displays.

The ST25R3916B device includes an advanced analog front end (AFE) and a highly integrated data framing system for ISO18092 passive and active initiator, ISO18092 passive and active target, NFC-A/B (ISO14443A/B) reader including higher bit rates, NFC-F (FeliCa™) reader, NFC-V (ISO15693) reader up to 53 kbps, and NFC-A / NFC-F card emulation. The ST25R3917B and ST25R3919B provides a reduced feature set compared to the ST25R3916B.

Special stream and transparent modes of the AFE and framing system is used to implement other custom protocols in reader or card emulation mode.

The ST25R39xxB feature high RF output power to directly drive antennas at high efficiency.

The ST25R39xxB include additional features, making them incomparable for low-power applications. The presence of a card is detected by performing a measurement of 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 ST25R39xxB after a selected time period and check for a presence of a tag using one or more techniques of low power detection of card presence (phase or amplitude).

The ST25R39xxB are designed to operate from a wide power supply range (2.6 to 5.5 V from -40 °C to +105 °C, 2.4 to 5.5 V from -20 °C to +105 °C), and a wide peripheral IO voltage range (from 1.65 to 5.5 V).

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.

• Operating modes
  • Reader/writer
  • Card emulation
  • Active and passive peer to peer
• RF communication
  • EMVCo^® PCD L1 3.2a 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
  • NFC-V/ISO15693 up to 53 kbit/s
  • NFC-A/ISO14443A (106 kbit/s) and NFC-F/FeliCa™ (212/424 kbit/s) card emulation
  • Active and passive peer to peer initiator and target modes, up to 424 kbit/s
  • Low-level modes to implement MIFARE Classic^®-compliant or other custom protocols
• Key characteristics
  • Dynamic power output (DPO) controls the field strength to stay within given limits
  • Active wave shaping (AWS) reduces over- and undershoots
  • Noise suppression receiver (NSR) allows reception in a noisy environment
  • Automatic antenna tuning (AAT) via variable capacitor
  • Integrated EMVCo^® PCD L1 3.2a-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
• External communication interfaces
  • 512-byte FIFO
  • Serial peripheral interface (SPI) up to 10 Mbit/s
  • I2C with up to 400 kbit/s in Fast-mode, 1 Mbit/s in Fast-mode Plus, and 3.4 Mbit/s in High-speed mode
• Electrical characteristics
  • Wide supply voltage and ambient temperature range (2.6 to 5.5 V from -40 °C to +105 °C, 2.4 to 5.5 V from -20 °C to +105 °C)
  • Wide peripheral communication supply range from 1.65 to 5.5 V
  • Quartz oscillator capable of operating with 27.12 MHz crystal with fast startup