LRI64 datasheet(6/38 Pages) STMICROELECTRONICS

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LRI64

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SIGNAL DESCRIPTION

AC1, AC0. The pads for the Antenna Coil. AC1

and AC0 must be directly bonded to the antenna.

COMMANDS

The LRI64 supports the following commands:

Inventory. Used to perform the anti-collision se-

quence. The LRI64 answers to the Inventory com-

mand when all of the 64 bits of the UID have been

correctly written.

Stay Quiet. Used to put the LRI64 in Quiet mode.

In this mode, the LRI64 only responds to com-

mands in Addressed mode.

Read Block. Used to output the 8 bits of the se-

lected block.

Write Block. Used to write a new 8-bit value in

the selected block, provided that the block is not

locked. This command can be issued only once to

each block.

Get_System_Info. Used to allow the application

system to identify the product. It gives the LRI64

memory size, and IC reference (IC_ID).

Initial Dialogue for Vicinity Cards

The dialogue between the Vicinity Coupling De-

vice (VCD) and the LRI64 is conducted according

to a technique called Reader Talk First (RTF). This

involves the following sequence of operations:

activation of the LRI64 by the RF operating

field of the VCD

transmission of a command by the VCD

transmission of a response by the LRI64

POWER TRANSFER

Power transfer to the LRI64 is accomplished by in-

ductive coupling of the 13.56MHz radio signal be-

tween the antennas of the LRI64 and VCD. The

RF field transmitted by the VCD induces an AC

voltage on the LRI64 antenna, which is then recti-

fied, smoothed and voltage-regulated. Any ampli-

tude

modulation

present

the

signal

demodulated by the Amplitude Shift Keying (ASK)

demodulator.

Frequency

ISO 15693 and ISO 18000-3 Mode 1 standards

define the carrier frequency (fC) of the operating

field to be 13.56MHz±7kHz.

Operating Field

The LRI64 operates continuously between Hmin

and Hmax.

–

The minimum operating field is Hmin and has a

value of 150mA/m (rms).

–

The maximum operating field is Hmax and has

a value of 5A/m (rms).

A VCD generates a field of at least Hmin and not

exceeding Hmax in the operating volume.

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