The ST25R3911B from STMicroelectronics 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).
According to Robin Scholes, field application engineer at Arrow Altech Distribution, 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. Thanks to automatic antenna tuning (AAT) technology, the device is optimised for applications with directly driven antennas. The ST25R3911B also contains two differential low impedance (1 Ω) antenna drivers.
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).
The chip is designed to operate from a wide (2,4 V to 5,5 V) power supply range; peripheral interface I- O pins support a power supply range from 1,65 V to 5,5 V.
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