EM MICROELECTRONIC -
MARIN SA
EM4025/EM4125
Read Only Contactless Identification Device
with Anticollision
Features
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Anticollision protocol to identify a number of
transponders (better then 20 tags/s at RF/32, 10
tags/s at RF/64)
55 bit memory array, laser programmable ROM
Two mask programmable data rate options: RF/64 and
RF/32
Data transmission reader to transponder: ASK 100%
(OOK)
Data transmission transponder to reader: ASK,
Manchester Code
On chip resonance capacitor
On chip supply buffer capacitor & voltage limiter
Large Modulation Depth
Operating frequency 100 – 150 kHz
Small chip size convenient for implantation
Description
The EM4025 is a CMOS integrated circuit for use in
electronic Read Only RF Transponders, often known as a
RFID Tag. The circuit is powered by an external coil
placed in an electromagnetic field, and gets its clock via
the coil terminals. The fixed code device identification is
programmed at manufacture by laser fusing of polysilicon
links. The chip starts at power up in a quiet mode.
Downlink Transmission occurs only on command from the
reader, normally as part of the anticollision/arbitration
scheme. A data rate of 64 or 32 periods of the carrier
frequency per data bit is available. Downlink Data is
Manchester Coded. Only an external coil is needed to
obtain the chip function. A parallel resonant capacitor is
integrated.
The EM4125 is the same device but with bumped
enlarged pads. All specified parameters and description
are applicable for the EM4125 device.
Typical Operating Configuration
Typical Applications
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Logistics
Manufacturing Automation
Anti-counterfeiting
Industrial transponder
Tracking and tracing
COIL1
L
COIL2
EM4025
L: typical 20.78 mH value for f
O
= 125 KHz
Fig. 1
Copyright
©
2005, EM Microelectronic-Marin SA
Subject to change without notice
Rev. B, 02/05
Phone: +41.32.755-5111, Fax: +41.32.755-5403
www.emmicroelectronic.com
info@emmicroelectronic.com
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
