EM MICROELECTRONIC-MARIN SA
V4070
Crypto Contactless Identification Device
Features
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On Chip Crypto-Algorithm
Two Way Authentication protocol
96 bits of Secret-Key in EEPROM (unreadable)
32 bits of fix Device Identification
30 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
200 pF on chip Resonant Capacitor (untrimmed)
-40 to +85°C Temperature range
115 kHz TO 135 kHz Field Frequency
On chip Rectifier and Voltage Limiter
No external supply buffer capacitance needed
due to low power consumption
Typical Operating Configuration
Coil 1
L
V4070
Coil 2
Typical value of inductance at 125 KHz is 8 mH
Figure 1
Description
The V4070 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 Identi-
fication of 32 Bits that can never be modified as well
as 30 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 «10» as when they
are delivered.
The V4070 transmits data to the transceiver by modu-
lating 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 com-
ponent required, all remaining functions are integrated
in the chip.
Pin Assignment
COIL 1
COIL 2
V4070
COIL1
COIL2
coil terminal / clock input
coil terminal
Figure 2
Applications
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High security automotive immobilizer
High security hands-free access control
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EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
