XRA00 Datasheet, PDF (5/40 Pages) STMicroelectronics – UHF, EPCglobal, Contactless Memory IC 96 bit ePC with Inventory and Kill Function

XRA00
SUMMARY DESCRIPTION
The XRA00 is a low-cost integrated circuit for use
in Radio Frequency Identification (RFID) tran-
sponders (tags) operating at UHF frequencies. It is
a 128 bit memory organized as 8 blocks of 16 bits
as shown in Table 5.
When connected to an antenna, the operating
power is derived from the RF energy produced by
the RFID Reader. Incoming data are demodulated
and decoded from the received Amplitude Shift
Keyed (ASK) signal and outgoing data are gener-
ated by the antenna reflectivity change using the
Frequency Shift Keying (FSK) coding principle.
The Data transfer rate is determined by the local
UHF frequency regulation.
The XRA00 follows the ePCglobal Class 1b UHF
recommendation for the radio-frequency power
and signal interface.
Figure 2. Pad Connections
Power
Supply
128 Mbit ^Regulator
AC1
EEPROM
ASK
Memory _Demodulator
AC0
Reflecting
Modulator
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The dialogue between the Reader and the XRA00
is conducted through the following consecutive
operations:
■ activation of the XRA00 by the UHF operating
field of the Reader
■ transmission of a command by the Reader
■ transmission of a response by the XRA00
This technique is called Reader Talk First (RTF).
applications. It is based on a determinist binary
tree scanning method accelerated by bin slot dis-
tribution. The XRA00 EEPROM memory can be
read and written, so that the users can program
the ePC code themselves, if desired.
The XRA00 has the following command set:
– SCROLLID: XRA00, matching data sent by the
Reader, replies by sending back the entire ID
Code. This command is used during the anti-
collision sequence.
– SCROLLALLID: XRA00 replies in an indiscrim-
inate way by sending back the entire ID Code.
– PINGID: This command is used as part of a
multi-XRA00 anti-collision sequence. XRA00,
matching data sent by the Reader, responds in
one of the eight specific bin slots.
– QUIET: XRA00, matching data sent by the
Reader, enters the Asleep state where it no
longer responds to the Reader commands. The
memory remains in the Asleep state until a valid
Talk command is received or the persistence
mode limit time has run out.
– TALK: XRA00, matching data sent by the
Reader, returns to the Awake state where it re-
sponds to commands from the Reader.
– KILL: XRA00, matching the entire ID Code, 16
bit CRC and the 8 bit Kill Code sent by the
Reader, no longer responds to Reader queries.
– ERASEID: The EraseID command is used to
erase the entire memory array.
– PROGRAMID: XRA00 programming is accom-
plished 16 bits at a time. Programming is al-
lowed only when the XRA00 is not locked.
– VERIFYID: The VerifyID command is used to
verify that all memory data bits have been pro-
grammed correctly.
Figure 3. Die Floor Plan
Table 1. Signal Names
AC1
Antenna Pad
AC0 (GND)
Antenna Pad
The XRA00 is specifically designed for extented
range applications that need automatic item iden-
tification. The XRA00 provides a fast and flexible
anti-collision protocol that is robust under noisy
and unpredictable RF conditions typical of RFID
(GND) AC0
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