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參數(shù)資料
| 型號： | ATA555814M01-PP |
| 廠商： | Atmel Corp. |
| 英文描述： | 1 kbit R/W IDIC with Deterministic Anticollision |
| 中文描述： | 1千比特讀/寫的確定性防撞投資業(yè)務 |
| 文件頁數(shù)： | 21/42頁 |
| 文件大?。?/td> | 557K |
| 代理商： | ATA555814M01-PP |
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21
4681C–RFID–09/05
ATA5558 [Preliminary]
b) The interrogator can detect whether any tag is present.
If no SOF pattern is returned then there is no tag present within the detection group so the
process continues with (a).
c) The interrogator checks the tag responses bit-wise within the anticollision loop.
If one or more active tags are within range, the interrogator will sequentially scan the Tag ID
bits from the most significant through to the least significant bits. Each time slot corresponds
to a particular Tag ID bit position. All tags reply simultaneously with dual pattern modulated
data, the response signals being superimposed on one another. A damped signal will thus
overwrite a non-damped signal so that a logical
1
Tag ID bit will prevail over a logical
0
bit.
d) The interrogator checks and eliminates tags.
If the interrogator detects a Tag ID logical
1
bit, it acknowledges reception by broadcasting a
gap in the field signal. This can be monitored and evaluated by all tags within the detection
group. Otherwise a Tag ID logical
0
bit induces no reaction from the interrogator.
On observing an acknowledge gap, any individual tag can, by checking the state of it’s own
current Tag ID bit, deduce whether it should remain in the current anticollision detection loop
(Tag ID bit =
1
) or whether it should eliminate itself from the detection group (Tag ID bit =
0
).
Eliminated tags will be muted and fall back into the READY state where they take no further
part in the current detection loop. They remain in this state until the next anticollision loop is
started by a new GetID command. Continue to (a)
Non eliminated tags remain in the detection loop and if the final Tag ID bit has not been
reached then the next Tag ID bit is interrogated in (c) otherwise (e).
e) End of a single anticollision loop
By the time the final Tag ID bit has been interrogated, there will be only one remaining active
tag within range – all others having been eliminated during the previous interactions.
Assuming no new tags have entered the interrogation since the start of the anticollision loop
and that all the signals have been correctly interpreted, the interrogator should at this stage
be able to identify the associated Tag ID. This active tag is set automatically into the
Selected state and replies with the anticollision response which consists of an SOF followed
a 16 bit CRC generated from it’s own Tag ID. If the received CRC matches the Tag ID the
interrogator may continue with (a) or (f).
If the received CRC is corrupted or does not match the calculated 16 bit value the interroga-
tor will issue a ResetSelected command to transfer this improperly selected tag back into the
READY state. Continue to (a).
f) The interrogator communicates directly with tag in Selected state.
At this stage the single identified and selected tag can undergo direct communication with
the interrogator and can be read and written with either Read, Write or Login commands.
This tag remains selected until the interrogator starts a new anticollision loop with a new
GetID command, or if other tags are addressed directly using a Select or GroupSelect com-
mand. The selected tag then drops into the Quiet state where it is excluded from all future
anticollision detection loops. Continue to (a).
相關PDF資料 |
PDF描述 |
|---|---|
| ATA555814-PAE | 1 kbit R/W IDIC with Deterministic Anticollision |
| ATA555814-PP | 1 kbit R/W IDIC with Deterministic Anticollision |
| ATA555815-DDT | 1 kbit R/W IDIC with Deterministic Anticollision |
| ATA555815-DDW | 1 kbit R/W IDIC with Deterministic Anticollision |
| ATA555815M01-DDT | 1 kbit R/W IDIC with Deterministic Anticollision |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ATA555814-PAE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:1 kbit R/W IDIC with Deterministic Anticollision |
| ATA555814-PP | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:1 kbit R/W IDIC with Deterministic Anticollision |
| ATA555815C-PP | 功能描述:外圍驅動器與原件 - PCI ATA555815C-PP Transponder RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| ATA555815-DDT | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:1 kbit R/W IDIC with Deterministic Anticollision |
| ATA555815-DDW | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:1 kbit R/W IDIC with Deterministic Anticollision |
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