EM MICROELECTRONIC
- MARIN SA
EM4170
125kHz CRYPTO READ/WRITE Contactless Identification Device
Description
The EM4170 is a CMOS integrated circuit intended for
use in electronic Read/Write RF Transponders. The chip
contains an implementation of a crypto-algorithm with 96
Bits of user configurable secret-key contained in
EEPROM. It also provides a unique Device Identification
of 32 bits that can never be modified as well as 94 bits of
freely programmable USER-MEMORY. Bits 15 and 14
of word 1 are used as Lock-Bits. The memory can only
be accessed for writing or erasing if these two bits have
the contents "x0" as when they are delivered.
The memory can be unlocked by using the PIN-code
command. In that case, the lock-bits are reset from the
value "x1" to the value "x0".
The EM4170 transmits data to the transceiver by
modulating the amplitude of the electromagnetic field,
and receives data and commands in a similar way.
The coil of the tuned circuit is the only external
component required, all remaining functions are
integrated in the chip.
Features
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On Chip Crypto-Algorithm
Two Way Authentication
96 bits of Secret-Key in EEPROM (unreadable)
32 bits of fix Device Identification
32 bits of PIN code (unreadable)
94 bits of USER_MEMORY (UM) with read access
(OTP)
Secret-Key programmable via CID-Interface
Lock-Bits to inhibit programming
Data Transmission performed by Amplitude
Modulation
Bit Period = 32 periods of carrier frequency
200pF on chip Resonant Capacitor (untrimmed)
-40 to +85°C Temperature range
100 kHz to 150 kHz Field Frequency
On chip Rectifier and Voltage Limiter
No external supply buffer capacitance needed due
to low power consumption
Typical Applications
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Anti-counterfeiting
High security hands-free access control
Typical Operating Configuration
COIL1
L
COIL2
EM4170
Typical value for inductance L is 8mH at f
O
= 125 KHz
Fig. 1
Copyright
2002, EM Microelectronic-Marin SA
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www.emmicroelectronic.com
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
