Description
The EM4056 is a CMOS integrated circuit intended foruse in contactless Read/Write transponders. The user’s configurable 2 kbits EEPROM memory contained in the chip is organised in 125 words of 16 bits, each word can be irreversibly protected against reading or/and writing attempts.
The user can define a password and protect part or all of the memory.

FEATUREs
• 2 kBits EEPROM organized in 125 words of 16 bits
• 3 words of 16 Bits Laser ROM for application number and serial number
• Programmable (OTP) Read and/or Write Protection on every word
• Programmable PIN coverage of the memory (0, 25, 50, 75 or 100 %)
• Power check for EEPROM Write operation
• Reader Talk First communication protocol
• Data transmission performed by Amplitude Modulation (ASK) and Biphase (CDP) coding
• Data rate 2 KBauds (Bit Period = 64 periods of carrier frequency)
• 100 to 150kHz carrier frequency
• Long range Read/Write operations
• Block check of data transmission (CRC)
• Anticollision protocol based on unique ID number(unlimited number of tags)
• PIN Code identification linked with counter of false attempts
• On chip arithmetic operation (addition, comparison of secret and non secret data, etc.)
• 340pF ± 3% on chip Resonant Capacitor
• No external supply buffer capacitance
• On chip Rectifier and Voltage Limiter

APPLICATIONs
• Ticketing
• Hands free Access control
• Prothesis identification
• Prepayment devices
• Manufacturing automation with portable database
• Industrial logistics