User's Manual

UM2252
Component description
DocID030806 Rev 2
11/26
4 Component description
4.1 ST25R3911B device
The ST25R3911B-AQFT is a highly integrated NFC initiator/HF reader IC embedding:
 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)
 FeliCa™ reader
The implementation of other standard and custom protocols (like MIFARE™ Classic) is
possible by using the AFE and implementing framing in the external microcontroller
(Stream and Transparent modes).
4.2 Schematic diagrams
4.2.1 USB connectivity and power supply
The X-NUCLEO-NFC05A1 expansion board can be connected via Arduino
®
UNO R3
connectors to the STM32 Nucleo board.
A green LED indicates if the 5 V supply is present on the X-NUCLEO-NFC05A1 expansion
board.
The six status LEDs are controlled via MCU.
Additional components are placed for the 5 V supply filtering.
Several solder jumpers enable an alternative connection of SCLK_MCU and /SS_MCU to
the STM32 MCU.