ST25R3911B-DISCO ST25R3911B RFID Reader 13.56MHz Evaluation Board

ST25R3911B-DISCO ST25R3911B RFID Reader 13.56MHz Evaluation Board

Technical Datasheet

The ST25R3911B is a highly integrated NFC Initiator / HF reader IC, 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), ISO 15693 reader 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 is positioned perfectly for the infrastructure side of the NFC system, where users need optimal RF performance and flexibility combined with low power.

The ST25R3911B includes several features that make it very suited for low power applications. It contains 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. It also contains a low power RC oscillator and wake-up timer that can be used to wake up the 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).

Features

• Based on ST25R3911B HF reader / NFC initiator with 1.4 W output power, supporting VHBR and AAT
• STM32L476RET6 32-bit microcontroller with 512 kB of Flash memory
• 105mm x 52mm, 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 RF field and the protocol used to communicate