the as3911b is a highly integrated nfc initiator / hf reader ic. it includes the analog front end (afe) and a highly integrated data framing system for iso18092(nfcip-1)initiator, iso 18092 (nfcip-1) active target, iso 14443 a and b reader (including high bit rates) and felica™ reader. implementation of other standard and custom protocolslike*™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, whereusersneedoptimal rf performance and flexibility combined with low power.
with ams’ unique automatic antenna tuning technology, the device is optimized for applications with directly driven antennas. the as3911b is alone in the domain ofhfreaderics 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 thepresenceofa 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 andcomparingitto stored reference. it also contains a low power rc oscillator and wake-up timer, which can be used to wake the system after a defined time period and check for the presence of a tagusing one ormoretechniques of low power detection of card presence (capacitive, phase or amplitude).
the as3911b is designed to operate from a wide power supply range from 2.4 v to 5.5 v; peripheral interface io pins support power supply rangefrom1.65v to 5.5 v.
applications
the as3911b is suitable for a wide range of applications including:
•  emv payment
•  access control
•  nfc infrastructure
•  ticketing
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