Design of universal radio frequency card reader/writer module based on FM1712
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Radio frequency card (contactless IC card) is a new technology developed in recent years. Compared with traditional contact IC card and magnetic card, the contactless IC card developed by radio frequency identification technology has successfully solved the problems of passive and contactless, and is a major breakthrough in the field of electronic devices. Its high security and confidentiality as well as its simple use have made it a rising star in various fields.
Introduction
The contactless radio frequency card reader introduced in this article is developed based on the single-chip microcomputer AT89C51CC01 and the FM1712 embedded reader chip. It can complete all the reading, writing and control operations of Mifare cards, and can be easily embedded in other systems (such as access control, public transportation, attendance, etc.) to become a part of the user system.
1 Introduction to FM1712 chip
FM1712 series is a dedicated chip for contactless card readers. It is manufactured using 0.6 micron CMOS EEPROM technology, and can support typeA and typeB contactless communication protocols at 13.56 MHz frequency, as well as the encryption algorithm of Mifare standard, and is compatible with Philips' RC500, RC530, and RC531 card reader chips.
The transmitter inside FM1712 can drive a short-range antenna (up to 10 cm) without adding active circuits, and its receiving part provides a solid and effective demodulation and decoding circuit for receiving ISO14443 compatible response signals. The digital part can also process ISO14443 frames and error detection parity CRC. The FM1712 chip only needs a small amount of peripheral circuits to work. It supports 6 microprocessor interfaces, and its digital circuit has two voltage working modes: TTL and CMOS.
基于FM1712的通用射频卡读写模块设计.pdf
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