R

EM4100

Copyright © 2004, EM Microelectronic-Marin SA

1

www.emmicroelectronic.com

Read Only Contactless Identification Device

Description

The EM4100 (previously named H4100) is a CMOS

integrated circuit for use in electronic Read Only RF

Transponders. The circuit is powered by an external coil

placed in an electromagnetic field, and gets its master

clock from the same field via one of the coil terminals. By

turning on and off the modulation current, the chip will send

back the 64 bits of information contained in a factor y pre-

programmed memory array.

The programming of the chip is performed by laser fusing

of polysilicon links in order to store a unique code on each

chip.

The EM4100 has several metal options which are used to

define the code type and data rate. Data rates of 64, 32

and 16 periods of carrier frequency per data bit are

available. Data can be coded as Manchester, Biphase or

PSK.

Due to low power consumption of the logic core, no supply

buffer capacitor is required. Only an external coil is needed

to obtain the chip function. A parallel resonance capacitor

of 74 pF is also integrated.

Features

□

64 bit memory array laser programmable

□

Several options of data rate and coding available

□

On chip resonance capacitor

□

On chip supply buffer capacitor

□

On chip voltage limiter

□

Full wave rectifier on chip

□

Large modulation depth due to a low impedance

modulation device

□

Operating frequency 100 - 150 kHz

□

Very small chip size convenient for implantation

□

Very low power consumption

Applications

□

Logistics automation

□

Anticounterfeiting

□

Access control

□

Industrial transponder

Typical Operating Configuration

Coil1

Coil2

EM4100

L: typical 21.9mH for fo = 125kHz

Fig. 1

Pin Assignment

EM4100

COIL1

COIL2

VDD

VSS

COIL1

Coil terminal / Clock input

COIL2

Coil terminal

Fig. 2