rf IDEAS BDG-EM4102FOB EM4102 Keyfob

This Keyfob has the EM4102 (previously named H4102). The EM4102 (previously named H4102) is a CMOS integrated circuit for use in electronic Read Only RF Transponders. The circuit is powered by an external coil placed in an electromagnetic field, and gets its master clock from the same field via one of the coil terminals. By turning on and off the modulation current, the chip will send back the 64 bits of information contained in a factor programmed memory array. 

The programming of the chip is performed by laser fusing of polysilicon links in order to store a unique code on each chip.