ATA559001-6DSY Atmel, ATA559001-6DSY Datasheet - Page 34

• 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

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ATA5590
After a tag has received a slot command
If the tag receives a new slot command (without the slot repeat, skip slot or slot close command)
the tag calculates if it is now to be active or not.
If the reader detects a collision, it can skip the slot directly by sending a skip slot command.
Then the formerly selected tags calculate a new slot value, rather than set the ID_s flag.
To increase the number of slots, the ATA5590 is able to change to a second arbitration level
which is based on deterministic procedures. Therefore, the ATA5590 is able to operate with sec-
ond level slots without changing the slot number.
The information which is backscattered by the tags is an 8-bit random number, and the contents
of the ID page. Therefore, if the tags are virgin or if the ID is not unique, the reader is able to
identify a collision between tags by observing the random number.
• It takes a random number from the random number generator, which points to a slot number
• After receiving the start command, all tags backscatter their information back to the reader
• If this random slot value matches the slot number which is under control of the reader, the tag
between 0 and 31 on-chip.
during the first slot, independently from the chosen random value. If the tag’s calculated
random value matches the first slot number, it calculates a new one during this slot.
Therefore, the tags in Aloha are always able to backscatter their information two times.
becomes active, enabling the reader to communicate with the tag. If the slot value doesn’t
match, the tag does not answer to any command (mute state). The other operations
(changing status1 or programming) are also blocked.
4817C–RFID–03/07