LRI512 datasheet(2/54 Pages) STMICROELECTRONICS

2 / 54 page

LRI512

2/54

SUMMARY DESCRIPTION

The LRI512 is a contactless memory, powered by

an externally transmitted radio wave. It is fully

compliant with the ISO15693 recommendation for

radio-frequency power and signal interface.

The LRI512 contains 512 bits of Electrically

Erasable Programmable Memory (EEPROM). The

memory is organized as 16 blocks of 32 bits.

Figure 2. Logic Diagram

The LRI512 is accessed by modulating the

13.56 MHz carrier frequency. Incoming data are

demodulated from the received signal amplitude

modulation (ASK, Amplitude Shift Keying). The

received ASK wave is 10% or 100% modulated

(amplitude modulation). The Data transfer rate is

1.6 kbit/s using the 1/256 pulse coding mode and

26 kbit/s using the 1/4 pulse coding modes.

Outgoing data are generated by antenna load

variation, using the Manchester coding, using one

or two sub-carrier frequencies at 423 kHz and

484 kHz. The Data transfer rate is 6.6 kbit/s, in the

low data rate mode, and 26 kbit/s, in the fast data

rate mode.

Table 1. Signal Names

Memory Mapping

The LRI512 is divided in 16 blocks of 32 bits. Each

block can be individually Write Protected using a

specific Lock command.

Table 2. LRI512 Memory Map

The User Area consists of blocks that are always

accessible in READ. WRITE commands are pos-

sible if the addressed block is not locked. During a

WRITE, the 32 bits of the block are replaced by the

new 32-bit value.

The LRI512 also has a 64-bit block that is used to

store the 64-bit Unique Identifier (UID). This UID is

compliant to the ISO15963 description, and its val-

ue is used during the anti-collision sequence (IN-

VENTORY). This block is not accessible by the

user, and the value is written by ST on the produc-

tion line.

The LRI512 also has an AFI register in which the

Application Family Identifier is stored, for use in

the anti-collision algorithm.

AC1

Antenna Coil

AC0

Antenna Coil

AI04008B

AC1

LRI512

AC0

Power

Supply

Regulator

Manchester

Load

Modulator

ASK

Demodulator

512 bit

EEPROM

Addr 0

User Area

UID 0

UID 1

UID 2

UID 3

UID 4

UID 5

UID 6

UID 7

AFI

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