srf66v01st Infineon Technologies Corporation, srf66v01st Datasheet - Page 8

• Manufacturer Part Number: srf66v01st
• Description: Intelligent 1 Kbit Eeprom With Contactless Interface Compliant To
• Manufacturer: Infineon Technologies Corporation

2.3
The system consists of a contactless label with an antenna and the PJM Light chip attached and a contactless
PJM reader together with an antenna. The label antenna is a simple coil made with a few turns. Contactless labels
are passive - meaning that they are powered by the field generated by the reader. Data is exchanged with data
rates up to 424 kbit/s.
An intelligent anticollision function enables the operation of more than one label in the field simultaneously. The
anticollision algorithm selects each label individually and ensures that the execution of a transaction with a
selected label is performed without data corruption caused by other labels.
Figure 4
2.4
The PJM Light has to be seen as a part of a label-interrogator system. It features reliable high-speed identification
with multiple tags simultaneously present within the reader operating volume.
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•
Differentiation between application groups can be achieved via a user defined Application Group Identifier stored
in chip memory. This ensures rapid identification of tags in open systems where there is no control over the
population of tags within a reader. Selecting one group of tags with a specific Application Group Identifier leaves
all tags from other application groups silent, therefore reducing the total number of tags communicating with the
reader which improves the read rate and reliability. If required, readers can command all present tags to reply
irrespective of their application group.
At chip manufacture a unique Specific Identifier (SID) is stored in the memory of the chip which allows individual
tags to be identified and addressed when multiple tags are simultaneously present within a reader.
Short Product Information
The readers can identify over 32,000 tags all simultaneously present within the reader even when the tags are
closely stacked.
An example identification rate is 150 tags in 100 ms.
System Description
Contactless System Description
Chip Features
(ISO/IEC18000-3 Mode 2 Reader)
Host System
Identification Terminal
µC
Antenna
Circuitry
Analog
8 / 10
Energy
Clock
Data
SRF 66V01ST
Contactless_System.vsd
PJM Light
PJM Light
SRF 66V01ST PJM Light
SRF 66V01ST
PJM Light
2009-02-26