R
EM MICROELECTRONIC -
MARIN SA
EM4122
Read-only UHF RFID IC
Description
The chip is used in passive UHF read-only transponder
applications. It is powered up by an RF beam transmitted
by the reader, which is received and rectified to generate
a supply voltage for the chip. A pre-programmed code is
transmitted to the reader by varying the amount of energy
that is reflected back to the reader. It implements a
robust and fast anti-collision protocol. The chip is
frequency independent and can be used for RF coupled
applications where reading ranges in excess of 10 m and
reading rates of 120 tags per second at 256 kbit/s can be
attained.
The chip is backscattering data using load modulation.
Therefore the reader should be able to detect ASK and
PSK modulated carrier.
Features
Factory programmed 64 bit ID number
High data rate: Up to 256 kbit/s
Frequency independent: Typically used at 869
MHz, 902 - 960 MHz (versions 001 to 099),
2.45 GHz (versions 101 to 199)
On-chip oscillator
On-chip rectifier
Low voltage operation - down to 1.0 V at
ambient temperature
Low power consumption
Low cost
-40
°
to +85
°
C operating temperature range
Typical Applications
The chip is ideal for applications where long range,
high-speed item identification is required:
Supply chain management
Tracking and tracing
Access control
Asset control
Licensing
Auto-tolling
Animal tagging
Sports event timing
Benefits
Anti-collision suited to flux monitoring
Very low consumption
High backscatter amplitude
Designed for ease of antenna attachment
Typical Operating Configuration
A
EM4122
V
ss
Fig. 1
UHF transponders can be implemented using an
EM4122 chip and an open dipole antenna.
Copyright
©
2005, EM Microelectronic-Marin SA
1
www.emmicroelectronic.com
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
