ST25R3914 ST25R3915 Automotive high performance HF reader / NFC initiator with 1 W output power supporting AAT Data brief Description The ST25R3914/5 are highly integrated NFC initiators / HF reader ICs for automotive applications, AEC-Q100 grade 1 qualified, including the analog front end (AFE) and a highly QFN32 / VFQFPN32 integrated data framing system for ISO 18092 (NFCIP-1) initiator, ISO 18092 (NFCIP-1) active target, ISO 14443A and B reader (including high Features bit rates), ISO 15693 reader and FeliCa reader. Implementation of other standard and custom AEC-Q100 qualified protocols like MIFARE Classic is possible using ISO 18092 (NFCIP-1) Active P2P the AFE and implementing framing in the external microcontroller (Stream and Transparent modes). ISO14443A, ISO14443B, ISO15693 and FeliCa The ST25R3914/5 are positioned perfectly for the infrastructure side of the NFC system, where Support HBR up to 848 kbit/s PICC to PCD and users need optimal RF performance and flexibility PCD to PICC framing combined with low power. Capacitive sensing - Wake-up Thanks to automatic antenna tuning (AAT) Automatic antenna tuning system providing technology, the devices are optimized for tuning of antenna LC tank (ST25R3914 only) applications with directly driven antennas. The Automatic modulation index adjustment ST25R3914/5 are alone in the domain of HF AM and PM (I/Q) demodulator channels with reader ICs as they contain two differential low automatic selection impedance (1 ) antenna drivers. Up to 1 W in case of differential output The ST25R3914/5 include several features that make them very suited for low power applications. User selectable and automatic gain control They contain a low power capacitive sensor that Transparent and Stream modes to implement can be used to detect the presence of a card MIFARE Classic compliant or other custom without switching on the reader field. The protocols presence of a card can also be detected by Possibility of driving two antennas in single performing a measurement of amplitude or phase ended mode of signal on antenna LC tank, and comparing it to the stored reference. They also contain a low Oscillator input capable of operating with power RC oscillator and wake-up timer that can 13.56 MHz or 27.12 MHz crystal with fast be used to wake up the system after a defined start-up time period, and to check for the presence of a 6 Mbit/s SPI with 96 bytes FIFO tag using one or more low power detection Wide supply voltage range from 2.4 V to 5.5 V techniques (capacitive, phase or amplitude). Wide temperature range: -40 C to 125 C The ST25R3914/5 are designed to operate from a ST25R3914: VFQFPN32, 5 mm x 5 mm wide (2.4 V to 5.5 V) power supply range package with wettable flanks peripheral interface IO pins support power supply range from 1.65 V to 5.5 V. ST25R3915: QFN32, 5 mm x 5 mm package June 2019 DB3075 Rev 2 1/3 For further information contact your local STMicroelectronics sales office. www.st.com INACTIVE - INACTIVE - INACTIVERevision history ST25R3914/5 1 Revision history Table 1. Document revision history Date Revision Changes 19-Oct-2016 1 Initial release. 25-Jun-2019 2 Updated document title, Features and Description. 2/3 DB3075 Rev 2 INACTIVE - INACTIVE - INACTIVE