for further information contact your local stmicroelectronics sales office. october 2016 docid029866 rev 1 1/3 st25r3914 ST25R3915 automotive high performanc e reader / nfc initiator with 1 w output power data brief 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 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 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? re ader. implementation of other standard and custom protocols like mifare? classic is possible using the afe and implementing framing in the external microcontroller (stream and transparent modes). the st25r3914/5 are positi oned perfectly for the infrastructure side of the nfc system, where users need optimal rf pe rformance and flexibility combined wit h low power. thanks to automatic antenna tuning technology, the devices are optimized for applications with directly driven antennas. the st25r3914/5 are alone in the domain of hf reader ics as they contain two differential low impedance (1 ohm) antenna drivers. the st25r3914/5 include several features that make them very suited fo r low power applications. they contain a low power capacitive sensor that can be used to detect the presence of a card without switching on the reader field. the presence of a card can also be detected by performing a measurement of amplitude or phase of signal on antenna lc tank, and comparing it to the stored reference. they also contain a low power rc oscillator and wa ke-up timer that can be used to wake up th e system after a defined time period, and to check for the presence of a tag using one or more low power detection techniques (capacitive, phase or amplitude). the st25r3914/5 are designed to operate from a wide (2.4 v to 5.5 v) power supply range; peripheral interface io pins support power supply range from 1.65 v to 5.5 v. qfn32 www.st.com
revision history st25r3914/5 2/3 docid029866 rev 1 1 revision history table 1. document revision history date revision changes 19-oct-2016 1 initial release.
docid029866 rev 1 3/3 st25r3914/5 3 important notice ? please read carefully stmicroelectronics nv and its subsidiaries (?st?) reserve the right to make changes, corrections, enhancements, modifications, and improvements to st products and/or to this document at any time without notice. purchasers should obtain the latest relevant in formation on st products before placing orders. st products are sold pursuant to st?s terms and conditions of sale in place at the time of o rder acknowledgement. purchasers are solely responsible for the choice, selection, and use of st products and st assumes no liability for application assistance or the design of purchasers? products. no license, express or implied, to any intellectual property right is granted by st herein. resale of st products with provisions different from the information set forth herein shall void any warranty granted by st for such product. st and the st logo are trademarks of st. all other product or service names are the property of their respective owners. information in this document supersedes and replaces information previously supplied in any prior versions of this document. ? 2016 stmicroelectronics ? all rights reserved
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