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AS3911 Datasheet(PDF) 1 Page - ams AG |
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AS3911 Datasheet(HTML) 1 Page - ams AG |
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1 / 149 page  ams Datasheet, Confidential: 2013-Oct [2-03] AS3911 – 1 AS3911 NFC Initiator / HF Reader IC The AS3911 is a highly integrated NFC Initiator / HF Reader IC. It includes 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 14443 A and B reader (including high bit rates) and FeliCa™ reader. Implementation of other standard and custom protocols 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 AS3911 is positioned perfectly for the infrastructure side of the NFC system, where users need optimal 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 AS3911 is alone in the domain of HF Reader ICs in that it contains two differential low impedance (1 Ω) antenna drivers. The AS3911 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. 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 tag using one or more techniques of low power detection of card presence (capacitive, phase or amplitude). The AS3911 is designed to operate from a wide power supply range from 2.4V to 5.5V; peripheral interface IO pins support power supply range from 1.65V to 5.5V. For further understanding in regards to the contents of the datasheet, please refer to the Reference Guide located at the end of the document. General Description |
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