Description
The e5551 is a contactless R/W-IDentification IC (IDIC)* for general-purpose applications in the 125 kHz
range. A single coil, connected to the chip, serves as the IC’s power supply and bidirectional communication
interface. Coil and chip together form a transponder.

FEATUREs
Low-power, low-voltage operation
Contactless power supply
Contactless read/write data transmission
Radio Frequency (RF): 100 kHz to 150 kHz
264 bit EEPROM memory in 8 blocks of 33 bits
224 bits in 7 blocks of 32 bits are free for user data
Block write protection
Extensive protection against contactless malprogramming of the EEPROM
Anticollision using Answer-On-Request (AOR)
Typical < 50 ms to write and verify a block
Other options set by EEPROM:
       Bitrate [bit/s]: RF/8, RF/16, RF/32, RF/40
               RF/50, RF/64, RF/100, RF/128
       Modulation: BIN, FSK, PSK, Manchester, Biphase
       Other: Terminator mode, Password mode