GENERAL DESCRIPTION
AS3911B NFC Initiator / HF Reader IC Implementation of other standard and custom protocols like MIFARE™ Classic1 is possible through using the AFE and implementing framing in the external microcontroller (Stream and Transparent modes). Compared with concurrent NFC devices designed with the mobile phone in mind, the AS3911B is positioned perfectly for the infrastructure side of the NFC system, where users need optimal RF performance and flexibility combined with low power. The AS3911B is alone in the domain of HF Reader ICs in that it contains two differential low impedance (1Ω) antenna drivers. The AS3911B includes several features, which make it incomparable for low power applications. It contains a low power capacitive sensor, which can be used to detect the presence of a card without switching on the reader field. Additionally, 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 stored reference.
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