NFC A vs NFC B vs NFC F-Difference between NFC-A,NFC-B,NFC-F
This NFC tutorial covers following sub topics:
How NFC Works NFC Modulation and coding NFC Tag vs NFC Reader NFC Tag Types NFC-A,NFC-B,NFC-F difference between bluetooth,wifi,RFID and NFC NFC Tools and Equipments
As we know NFC is widely used across the globe for short range communication with low data rate applications. It stands for Near Field Communication technology. There are various modes by which NFC compliant devices can communicate. There are different types of NFC tags developed for various applications. In order to communicate, there should exist signalling protocol. This signalling protocol will help two devices to communicate and exchange information. There are three signalling modes defided in NFC referred as NFC-A, NFC-B and NFC-F. This page describes difference between NFC-A, NFC-B and NFC-F. At the start of communication, both the initiator and target will communicate the technology to be used as signalling protocol. The same has been outlined below.
The signalling type NFC-A is based on ISO/IEC 14443A. It is similar to RFID type A. In the type-A based communication delay encoding (miller encoding) technique is employed along with AM modulation. Here binary data is transmitted with the data rate of about 106 Kbps using type A communication. Here binary signal must change from 0 % to 100 % to distinguish between binary 1 and binary 0 data informations.
The signalling type NFC-B is based on ISO/IEC 14443B. It is similar to RFID type B. Here manchester encoding technique is employed. Here instead of 100%, AM modulationat 10% is used. This convention is used to distinguish between binary 1 and 0. 10% change from 90% for binay 0 (i.e. low) and 100% for binary 1 ( i.e high) is used.
In manchester coding zero cross over happens in the bit period used to represent both 0 and 1. Here a low to high transition represents binary 0 bit and high to low transition represents binary 1 bit. It is recommended to have the zero cross over in the middle of the bit period.
The signalling type NFC-F is based on FeliCA JIS X6319-4. It is the faster form of RFID communication. It is alse known as FeliCa. It is the technology most popularly used in Japan. It is used for variety of applications such as creadit card or debit card based payments, subway ticketing for access control to the trains, personal identification at the office and residential flats etc.
Refer NFC basics article which covers NFC (Near Field Communication) basics including NFC operation modes, NFC frequency, NFC data rates, NFC tag types, NFC applications and NFC signalling types and more.
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