XRA00 datasheet(5/40 Pages) STMICROELECTRONICS

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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

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).

Table 1. Signal Names

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

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

AC1

Antenna Pad

AC0 (GND)

Antenna Pad

128 Mbit

EEPROM

Memory

Power

Supply

Regulator

ASK

Demodulator

Reflecting

Modulator

ai10741

AC1

AC0

ai10742

(GND) AC0

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