EM4170 Datasheet, PDF (1/13 Pages) EM Microelectronic - MARIN SA – 125kHz CRYPTO READ/WRITE Contactless Identification Device

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
• 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
• Anti-counterfeiting
• High security hands-free access control
Typical Operating Configuration
L
COIL1
EM4170
COIL2
Typical value for inductance L is 8mH at fO = 125 KHz
Fig. 1
Copyright  2002, EM Microelectronic-Marin SA
1
www.emmicroelectronic.com