Description:
> TK4100 is a CMOS integrated circuit for use in 125KHz read only RFID card.
It is compatible with EM format.
Features:
> 64 bit memory array laser programmable
> Several options of data rate and coding available
> On chip resonance capacitor
> On chip voltage limiter
> Full wave rectifier on chip
> Large modulation depth due to a low impedance modulation device
> Operating frequency 100-150 KHz
> Very small chip size convient for implantation
> Very low power consumption
Operation:
Menchester modeulation coding (Type code, data rate is RF/64). Only if the chip produce at both ends of extermal coil induced voltage >=3.5Vpp and the clock rate is 125Khz , it will start working.NFC CARD

The technology has the advantage of information exchange do not need to have any contact between card and card reader. Card storage capacity generally between 256 b and 72 KB, at present the most popular technology of Legic,, Mifare Desfire, iCode and HID class and so on, also follow ISO14443 kathi Jones from A&B communication protocol chip. Usually used for access control to collect fees, bus, subway, etc. Contactless IC card chip produced by PHILIPS company used by the Mifare one S50 S70 or chips, about 80%, so a lot of people traditionally called contactless IC card "M1 card".combo cards