STMicroelectronics ST25R3915 NFC / HF RFID reader IC

AEC-Q100 grade 1 qualified, including the analog front end (AFE) and a highly integrated data framing system for ISO 18092 (NFCIP-1) initiator, ISO 18092 (NFCIP-1) active target, ISO 14443A and B reader (including high bit rates) and FeliCa™ reader. Implementation of other standard and custom protocols like MIFARE™ Classic is possible using the AFE and implementing framing in the external microcontroller.Added Automatic Antenna Tuning for direct Antenna drive. The ST25R3914/5 are alone in the domain of HF reader ICs as they contain two differential low impedance (1 Ohm) antenna drivers.

Key features

• Automatic antenna tuning system
• AEC-Q100 qualified
• Transparent and Stream modes to implement MIFARE™ Classic
• Wide supply voltage range from 2.4 V to 5.5 V

Additional features

• AEC-Q100 qualified
• ISO 18092 (NFCIP-1) Active P2P
• ISO14443A, ISO14443B and FeliCa™
• Support HBR up to 848 kbit/s PICC to PCD and PCD to PICC framing
• Capacitive sensing - Wake-up
• Automatic antenna tuning system providing tuning of antenna LC tank (ST25R3914 only)
• Automatic modulation index adjustment
• AM and PM (I/Q) demodulator channels with automatic selection
• Up to 1 W in case of differential output
• User selectable and automatic gain control
• Transparent and Stream modes to implement MIFARE™ Classic compliant or other custom protocols
• Possibility of driving two antennas in single ended mode
• Oscillator input capable of operating with 13.56 MHz or 27.12 MHz crystal with fast start-up
• 6 Mbit/s SPI with 96 bytes FIFO
• Wide supply voltage range from 2.4 V to 5.5 V
• Wide temperature range: -40° C to 125° C
• QFN32, 5 mm x 5 mm package

Applications

• Car access control
• Personal settings
• Diagnostics