for further information contact your local stmicroelectronics sales office. june 2017 docid030293 rev 2 1/5 ST25R3911B-DISCO discovery kit fo r the st25r3911b high performance hf reader / nfc initiator data brief features ? based on st25r3911b high performance hf reader / nfc initiator with 1.4 w output power, supporting vhbr and aat ? iso 18092 (nfcip-1) active p2p ? iso14443a, iso14443b and felica? ? iso15693 ? supports vhbr (3.4 mbit/s picc to pcd framing, 6.8 mbit/s afe and pcd to picc framing) ? up to 1.4 w output power with differential antenna ? possibility of driving two antennas in single ended mode ? inductive and capacitive wake-up ? automatic antenna tuning system ? dpo (dynamic power output) ? user selectable and automatic gain control ? transparent and stream modes to implement mifare? classic compliant or other custom protocols ? 6 mbit/s spi ? wide supply voltage range (from 2.4 v to 5.5 v) ? qfn32, 5 mm x 5 mm package ? stm32l476ret6 32-bit microcontroller with 512 kb of flash memory ? 105 mm x 52 mm, two turns antenna etched on the pcb, and associated vhbr tuning circuit ? micro-usb connector for communication with the host pc and board powering ? six leds indicating the presence of the rf field and of the protocol used to communicate www.st.com
description ST25R3911B-DISCO 2/5 docid030293 rev 2 1 description the ST25R3911B-DISCO is a ready-to-use kit featuring the st25r3911b, an highly integrated hf reader / nfc initiator ic. the ST25R3911B-DISCO can be operated as iso18092 (nfcip-1) active and passive initiator, iso18092 (nfcip-1) active target, iso 14443a and b reader including very high bit rates (vhbr), long range iso15693 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 (stream and transparent modes). the ST25R3911B-DISCO addresses a wide range of applications such as access control, ticketing, industrial, medical and consumer, where users need optimal rf performance and flexibility combined with low power consumption. the ST25R3911B-DISCO kit, whose block diagram is shown in figure 1 , allows the user to exploit several features of the st25r3911b. it contains a low power capacitive sensor that can be used for ultra-low power wakeup without switching on the reader field. traditi onal inductive wakeup with the choice of amplitude or phase measurement can be used as well. the automatic antenna tuning (aat) technology enables operation close to metallic parts and/or in changing environments. the availabl e software visually di splays the impact of aat, thus enabling an easy evaluation of the feature. figure 1. functional block diagram 6 7 5 % ' , 6 & 2 8 6 % + r v w 3 & 1 r w h e r r n 0 6 9 6 3 , 6 7 0 / $ q w h q q d 6 7 5 %
docid030293 rev 2 3/5 ST25R3911B-DISCO hardware configuration 5 2 hardware configuration the ST25R3911B-DISCO board can be con nected via usb with a pc, and used as a general purpose hf reader / nfc initiator. the additional uart and i2c host interfaces (see figure 2 ) can be used to integrate the board directly into an existing setup. a graphical user interface (gui) can be downloaded from the nfc pages on www.st.com , it enables easy communication with the board and allows the user to explore the st25r3911b features. the board is configured to support iso14443a/b, iso15693, felica? and ap2p communication. by default a vhbr compatible matching is po pulated, this matching makes it possible to achieve bit rates up to 3.4 mbps. to maximize performance in applications where such very high bit rates are not needed an alternative nfc forum matching is available. to switch to the nfc forum matching the user only needs to exchange the components listed in table 1 . this matching doubles the q-factor, thus increasing the read range up to 10% when operating at bit rates up to 848 kbps (hbr). operation at bit rates of 1.6 mbps or higher is not possible with the nfc forum matching. figure 2. position of main bl ocks on ST25R3911B-DISCO board table 1. matching variants component vhbr matching nfc forum matching c404 keep populated use c404_nfcf c410 use c410_nfcf r401 use r401_nfcf r402 use r402_nfcf
revision history ST25R3911B-DISCO 4/5 docid030293 rev 2 3 revision history table 2. document revision history date revision changes 08-feb-2017 1 initial release. 26-jun-2017 2 updated image on cover page.
docid030293 rev 2 5/5 ST25R3911B-DISCO 5 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. ? 2017 stmicroelectronics ? all rights reserved
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