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XRA00 bảng dữ liệu(PDF) 36 Page - STMicroelectronics

tên linh kiện XRA00
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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XRA00 bảng dữ liệu(HTML) 36 Page - STMicroelectronics

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XRA00
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ANTI-COLLISION FEATURES
Several features of this anti-collision approach de-
serve mention:
■
Each transaction with the XRA00 field is a self-
contained operation. A command - reply pair is
an atomic transaction requiring no knowledge
of previous events from a XRA00 for it to reply.
This feature greatly enhances robustness for
passive XRA00 devices in noisy environments
or at marginal RF power levels.
■
Related to this, the Reader maintains
information about the progress through the
binary tree. Branches that show XRA00
signals, but are not immediately explored may
be held in memory and later examined to
improve the overall throughput.
■
Readers with widely varying capabilities can
make use of the same protocol.
–
A sophisticated Reader that can perform
contention detection within a bin can
perform very rapid sorts of groups of
XRA00 devices. XRA00 devices can be
quickly isolated using a series of PingID
commands, and then read using the
ScrollID command.
–
Simple Readers without the ability to
detect contention (for example, a Reader
with only an analogue filter to look for
"XRA00-like" modulation) can still sort and
identify XRA00 devices using only the
PingID command.



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