This part is a kind of semiconductor called A9211B.

Function of this product has ISO/IEC 14443A RFID TAG IC.

Manufacturers : AMIC Technology

Image and pinout :

Some of the text within the PDF file :

A9211B ISO/IEC 14443A RFID TAG IC FEATURE – Compatible with ISO/IEC 14443A Standard – No external power supply required – 13.56MHz operating frequency – Total embedded 2048 bit OTP memory – 100% ASK demodulator – Cascaded two level 7 byte serial number – 106 kbps for high data rate, – Manchester encoding TX data output OTP Memory – 224 x 8 bits of data memory organized in 56 pages – Each page is organized in 4 bytes for one time programming – Data retention up to 10 years – Private 32bits password protected Self destruct function Antenna ANTP Anti-collision RX Demod State Machine CLK TX Data Process Mod Memory Ctrl Encoder ANTM RF Interface Digital Control OTP Figure 1: A9211B Block System Diagram p1 of 15 Ver. 1.0 A9211B ISO/IEC 14443A RFID TAG IC [ ... ]

A9211B PDF Datasheet Download