Real-Time Clock IC (FRTC Series)

FRTC Series Real-Time Clock ICs Overview

Radio-frequency identification (RFID) chips are integrated circuits used in RFID systems for RF signal transmission and reception, data processing, and the storage of identification information. Based on their position and function within the system, RFID chips are generally classified into reader-side chips and chips used in contactless cards or electronic tags.

Reader-side RFID chips establish contactless communication with contactless cards or electronic tags through an RF front end, an external antenna, and an impedance-matching network. They perform essential low-level functions, including carrier modulation, signal demodulation, data encoding and decoding, and error checking.

The NF Series includes the NF522, NF663, and other RFID chips designed primarily for 13.56 MHz contactless reader applications. The NF522 supports reader modes for ISO/IEC 14443 Type A, ISO/IEC 14443 Type B, and ISO/IEC 15693, and provides SPI, I²C, and UART host interfaces.

The chip integrates a 64-byte transmit/receive FIFO, CRC-16 error checking, a programmable timer, interrupt control, and low-power card detection. Together with a microcontroller unit (MCU), an antenna, and an RF impedance-matching circuit, the NF522 can be used to build a contactless RFID reader system.

NF Series RFID chips are suitable for applications including access control and time-and-attendance systems, identity authentication, smart terminals, asset management, industrial identification, and portable reader devices.

System performance—including protocol compatibility, communication speed, power consumption, and effective read/write range—depends on the specific chip model, antenna design, impedance matching, tag characteristics, power-supply conditions, and installation environment. Product selection and circuit design should be based on the official datasheet and technical specifications for the applicable device model.