钥匙链的话卡，身份证、智能卡的无线射频识别

Key chain card rfid tag em4100 em marin: Read Only Contactless Identification Device Description The EM4100 (previously named H4100) 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 y pre-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. The EM4100 has several metal options which are used to define the code type and data rate. Data rates of 64, 32 and 16 periods of carrier frequency per data bit are available. Data can be coded as Manchester, Biphase or PSK. Due to low power consumption of the logic core, no supply buffer capacitor is required. Only an external coil is needed to obtain the chip function. A parallel resonance capacitor of 74 pF is also integrated. Features 64 bit memory array laser programmable Several options of data rate and coding available On chip resonance capacitor On chip supply buffer 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 convenient for implantation Very low power consumption Applications Logistics automation Anticounterfeiting Access control Industrial transponder