ST25R3917 NFC and EMVCo Reader

STMicroelectronics' ST25R3917 are high-performance NFC universal devices supporting NFC passive initiator and reader mode. Being fully compliant with EMVCo 3.0 analog and digital, this NFC IC is optimized for POS terminal applications and enables 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 initiator, NFC-A/B (ISO 14443A/B) reader including higher bit rates, NFC-F (FeliCa™), reader and NFC-V (ISO 15693) reader up to 53 kbps. 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 ST25R3917 feature high RF output power to directly drive antennas at high efficiency. The ST25R3917 includes additional features, making them incomparable for low power applications. The presence of a card can be detected by measuring the amplitude or phase of the antenna signal. The ST25R3917 also contains a low-power RC oscillator and wake-up timer to automatically wake-up the IC after a selected 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 ST25R3917 is designed to operate from a wide power supply range (from 2.4 V to 5.5 V) and a wide peripheral IO voltage range (from 1.65 V to 5.5 V).

Features

• Operating modes
  • Reader/writer
  • Passive peer-to-peer initiator
• RF communication
  • 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 kb/s
  • Passive peer-to-peer initiator mode, up to 424 kbit/s
  • Low-level modes to implement MIFARE® classic compliant or other custom protocols
• Hardware features
  • Dynamic power output (DPO) controls the field strength to stay within given limits
  • Active wave shaping (AWS) reduces over- and under-shoots
  • Noise suppression receiver (NSR) allows reception in noisy environments
  • Integrated EMVCo compliant EMD handling
  • Automatic gain control and squelch feature to maximize SNR
  • Low power inductive card detection
  • Adjustable ASK modulation depth, from 5% to 40%
  • 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, driver current, RSSI, on-chip supply, and regulated voltages
  • Up to 1.6 W differential output power from internal LDO
• 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 range: 2.4 V to 5.5 V
  • Wide peripheral communication supply range: 1.65 V to 5.5 V
  • Wide temperature range: -40°C to +125°C
  • Quartz oscillator capable of operating with 27.12 MHz crystal with fast start-up