EM4450

EM4550

Copyright

 2003, EM Microelectronic-Marin SA

1

www.emmicroelectronic.com

1 KBit Read/Write Contactless Identification Device

Description

The EM4450/4550 is a CMOS integrated circuit intended

for use in electronic Read/Write RF Transponders. The

difference between EM4450 and EM4550 is that EM4550

are bumped and has megapads for the two coils. The chip

contains 1 KBit of EEPROM which can be configured by

the user, allowing a write inhibited area, a read protected

area, and a read area output continuously at power on.

The memory can be secured by using the 32 bit password

for all write and read protected operations. The password

can be updated, but never read. The fixed code serial

number and device identification are laser programmed

making every chip unique.

The EM4450/4550 will transmit data to the transceiver by

modulating the amplitude of the electromagnetic field, and

receive data and commands in a similar way. Simple

commands will enable to write EEPROM, to update the

password, to read a specific memory area, and to reset

the logic.

The coil of the tuned circuit is the only external component

required, all remaining functions are integrated in the chip.

Features

1 KBit of EEPROM organized in 32 words of 32 bits

32 bit Device Serial Number (Read Only Laser ROM)

32 bit Device Identification (Read Only Laser ROM)

Power-On-Reset sequence

Power Check for EEPROM write operation

User defined Read Memory Area at Power On

User defined Write Inhibited Memory Area

User defined Read Protected Memory Area

Data Transmission performed by Amplitude Modulation

Two Data Rate Options 2 KBd (Opt64) or 4 KBd (Opt32)

Bit Period = 64 or 32 periods of field frequency

170 pF ± 2% on chip Resonant Capacitor

-40 to +85°C Temperature range

100 to 150 kHz Field Frequency range

On chip Rectifier and Voltage Limiter

No external supply buffer capacitance needed due to

low power consumption

Available in chip form for mass production and PCB and

CID package for samples.

Applications

Ticketing

Automotive Immobilizer with rolling code

High Security Hands Free Access Control

Industrial automation with portable database

Manufacturing automation

Prepayment Devices

Typical Operating Configuration

Coil2

Coil1

EM4450

Typical value of inductance at 125 kHz is 9.6 mH

L

Fig.1