This part is a kind of semiconductor called PCF7941.

Function of this product has Security Transponder and RISC Controller.

Manufacturers : Philips

Image and pinout :

Some of the text within the PDF file :

Philips Semiconductors Preliminary Information Product Profile Security Transponder and RISC Controller, STARC lite Features • Compatible with Security Transponder, PCF7936AS. • RISC Programmable Keyless Entry features • 384 Bit EEPROM • 16-Pin SO package Transponder • 64/32 bit mutual authentication calculation unit • 32 bit unique device identification number • 48 t bit Secre Key • Fast mutual authentication (39 ms) • EEPROM read/write protection capability • Excellent 5 sensitivity in read and write mode (3 µT) RISC Controller • Advanced 8-bit RISC architecture • 4 Kbyte ROM, 64 Byte RAM • On-chip < RC oscillator ( ±10%) • Short instruction execution time (as fast as 1µs) • 11 I/O ports, general purpose • Code hopping based on tr [ ... ]

PCF7941 PDF Datasheet Download