XingxunThe Ci522 RF chip from Zhongke Xingxun is an 848Kbit/s ISO 14443A compliant MIFARE SPI chip. It is a QFN-16-EP(3x3) package RF chip, with a RoHS compliant construction. It is a member of the Ci5x2 family of RF chips, which are designed for applications such as contactless payment, loyalty programs, or access control systems. The Ci522 can act as a base station for one or more slaves, with up to 4kbits of data storage per slave. The communication speed is 848Kbit/s, and it supports MIFARE SPI interface. The chip features a fast wake-up time, which helps reduce power consumption. It is also optimized for anti-collision and reliable communication. Its QFN-16-EP(3x3) package makes it ideal for use in handheld devices, RFID cards, PC cards, watchbands, and other small form-factor products.