ATA559001-6DSY Atmel, ATA559001-6DSY Datasheet - Page 46

• 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

7. Elements of the Link
7.1
46
Forward Link
ATA5590
As the tag normally works in a very noisy environment, the link must support techniques to
achieve a high signal to noise ratio (SNR), and low bit error rates (BER). Therefore, the default
link supports
Additionally, the link is protected by 2 kinds of CRC:
When using classic commands (read, program), the 16-bit CRC is used during the forward and
return link. For group and anticollision commands, the 16-bit CRC is used only one time.
Short commands are based only on the 2-bit command CRC plus the 16-bit return link CRC
The forward link supports long and short commands. If the header was correctly received,
ATA5590 is able to receive and to decode the following stream of the reader. After it has
received the 8-bit command code, ATA5590
Additionally, ATA5590 supports two temporary commands (skip_slot and repeat_arb). After
receiving these codes, ATA5590 checks the conditions. If the commands are enabled, the stor-
ing mechanism of the 6-bit command frame is skipped. Therefore, ATA5590 backscatters an
answer based on the command which was received before. Temporary commands have the
same length as short commands, also including the 2-bit command CRC.
• PR-ASK for generating a system clock (notch)
• Synchronous return link controlled by notch signals generated by the reader
• Different coding styles for the return link
• 2-bit CRC for each command byte
• 16-bit CRC frame over all data
• Stores the 6 bits of the command frame in a command register, and
• Checks the two bits of the command CRC
– ASK technique with m
BER and SNR values which are achievable with PR-ASK
0.8 is also supported, but this technique does not support
4817C–RFID–03/07