EM MICROELECTRONIC -
MARIN SA
EM4056
2KBIT Read/Write with ANTICOLLISION
Contactless Identification Device
Description
The EM4056 is a CMOS integrated circuit intended for
use 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.
Serial and identification numbers are laser programmed
during IC manufacturing. A reserved application
numbering may be made available and customer specific
on request.
The EM4056 transmits its data towards the reader by
amplitude modulation of the magnetic field and receives
the commands from the reader in a similar way.
Simple set of commands allow the dialogue between the
EM4056 and the reader. Read and write commands
access directly to an address of memory.
The EM4056 has a built-in anticollision protocol which
allows an unlimited number of transponders in the reader
field to dialogue simultaneously.
The transmission antenna is the only external element
required, all the other elements are integrated on chip.
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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
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Ticketing
Hands free Access control
Prothesis identification
Prepayment devices
Manufacturing automation with portable database
Industrial logistics
Features
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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
Typical Operating Configuration
C2
L
C1
EM4056
Typical value for inductance L is 4.78mH at f
O
= 125 KHz
Fig. 1
Copyright
©
2005, EM Microelectronic-Marin SA
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www.emmicroelectronic.com
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
