Introduction:
NFC stands for Near Field Communication, is by Philips and Sony jointly developed a new short-range wireless communications technology. Not long ago, the number of companies, universities and users jointly established a pan-European alliance to develop NFC open architecture, and to promote their application in the phone. NFC by a non -contact radio frequency identification (RFID) technology integration and interoperability evolved, combined with proximity reader, contactless card and peer functionality on a single chip, can be identified and data with compatible devices within a short distance exchange. This technology was initially RFID technology and network technology simple merger has now evolved into a short-range wireless communications technology , the development trend fairly quickly.
Unlike the RFID , NFC and a bidirectional connection with the identified characteristics, working at 13.56MHz frequency range of effective distance of about 10 cm . NFC technology to promote standardization in ISO 18092, ECMA 340 , and ETSI TS 102 190 framework, but also compatible with the widely used ISO 14443 Type-A, B (hardware only support, software part of the need to develop their own) and Felica standard contactless smart cards infrastructure.
NFC chip installed on the phone, the phone can read information from electronic payment and other NFC devices or tags. NFC short-range interaction greatly simplifies the entire certification process to identify, enable access between electronic devices to each other more direct, more secure and more clearly. Can be quickly and easily via a wireless connection between multiple devices NFC, computers, digital cameras, mobile phones, PDA, etc., thus achieving data exchange and services.
NXP (formerly Philips) vision for the future is to create a place where everybody can be connected anywhere in the world want to information, entertainment and services, NFC technology plays a very important role in this vision. Its intuitive mode of operation, easy to operate for consumers to use, in addition, it incorporates many safety features, making it an ideal choice for payment mechanisms and financial applications.
PN532 Overview:
PN532 is a highly integrated contactless reader chip, which contains the 80C51 microcontroller core (the 8051 user programming it is not, it is used to built-in NFC underlying communication protocol stack), integrated under each 13.56MHz kind of active/passive contactless communication methods and protocols.
PN532 transmission module supports 6 different operating modes:
Reader mode , supports ISO / IEC 14443A / MIFARE? Mechanism
Reader mode FeliCa support mechanisms
Reader mode , supports ISO / IEC 14443B mechanism
Card operating mode , supports ISO 14443A / MIFARE? Mechanism
Card operation mode , FeliCa mechanism
ISO/IEC18092, ECM340 point
PN532 features:
80C51 microcontroller core with 40 kB ROM and 1 kB RAM of
Highly integrated analog circuits, demodulation and decoding response
Connect the antenna output buffer driver through the least amount of external passive components
Integrated RF field detector
Integrated data pattern detector
Supports ISO / IEC 14443A / MIFARE?
Only supports ISO / IEC 14443B in reader mode
In a typical reader mode working distance of more than 50mm, the specific distance determined by the size of the antenna , tuning and power
In NFCIP-1 mode from the high 50mm, depending on the size of the antenna , and the power supply may be tuned
In a typical card operation mode working distance of about 100mm, the distance is determined by the specific antenna size , tuning , and external field strength
In the reader mode, supports Mifare Classic encryption, supports 212 kbit / s and 424 kbit / s data transfer rate of two kinds of higher
Under FeliCa mode, support 106kbit / s, 212kbit / s and 424kbit / s communication baud rate
Integrated RF interface, the transmission rate of NFCIP-1 up to 424kbit / s
Flexible interrupt mode
Low-power mode a hardware power-down mode a software power-down mode
When the device is in power-down mode through I2C, HSU and SPI interface automatically wake
Programmable Timer
Quartz crystal oscillator
2.7V ~ 5.5V power supply
Power supply for external use encryption chip switching function
Control external devices dedicated I / O pins
Used for product testing integrated antenna detector
IC is connected with an external encryption ECMA 373 NFC-WI Interface