ATA559001-6DSY Atmel, ATA559001-6DSY Datasheet - Page 42

• Manufacturer Part Number: ATA559001-6DSY
• Description: RF Wireless Misc UHF (1k bit r/w anti-collision)
• Manufacturer: Atmel

Specifications of ATA559001-6DSY

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.13
4.13.1
4.13.2
4.13.3
4.13.4
42
Application-specific Selection Procedures
ATA5590
Initialization of Virgin Tags Out of a Group of Tags
One Tag is in the RF Field
Several Tags are in the RF Field
Moving Tags in the Field
ATA5590 supports two possibilities for communication with virgin tags. During Aloha, the tags
calculate a slot number which is independent from the memory contents. If only one tag back-
scatters during a slot, this tag can be programmed.
In the case of deterministic procedures, the reader shall send a command which enables an
arbitration over a random value. Based on this random value, the reader can isolate each tag.
After separation, the reader is able to program the tags with a unique number (Tag_ID or
item-linked information).
Once the tag IC is ready for operation, the reader can send a first command to the tag to start
communication.
If the situation is stable (the tags are not moving), the reader can send a wake-up command first
to get an initial impression of how many tags are in the field.
Then the reader determines which kind of selection procedure it wants to use, or it can decide
that there is a need first for a pre-selection.
Pre-selection can be based on an AFI mechanism or can be based on some portion of the mem-
ory contents. Each anticollision mechanism supports the feasibility of operating with or without
pre-selection, as does each read or program command.
The reader is also free to chose to operate using anticollision commands, a combination of
Aloha and deterministic procedures, or a combination of both.
Notes:
If there is a possibility of tags arriving in the field (because the tags are moving), then it is recom-
mended to operate with pre-selection. At the end of the communication (with the selected tags),
the reader can send a wake-up command to all tags not pre-selected to be sure that it has iden-
tified all tags in the RF field which can participate (ID_s = 0).
1. The deterministic selection process supported by ATA5590 is able to address each bit position
2. Deterministic arbitration is not limited by block or page borders of the EEPROM.
of the EEPROM during the arbitration process.
4817C–RFID–03/07