125KHz RFID Card

TK4100 proximity card is a CMOS integrated circuit for use in 125KHz read only RFID cards.It is compatible with EM format. The circuit is powered by external coil in an alternating magnetic field, and via one of coil terminal to get its clock from this field.The other coil terminal turns on and off the modulation current, the chip will send back the 64 bits of information contained in the factory pre-programmed memory array.