LRI64_08 datasheet(11/52 Pages) STMICROELECTRONICS

Part #	LRI64

Description	Memory tag IC at 13.56 MHz, with 64-bit unique ID and WORM user area, ISO 15693 and ISO 18000-3 Mode 1 compliant

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LRI64

Communication signal from VCD to LRI64

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5

Communication signal from VCD to LRI64

Communications between the VCD and the LRI64 involves a type of amplitude modulation

called amplitude shift keying (ASK).

The LRI64 only supports the 10% modulation mode specified in ISO 15693 and ISO 18000-

3 Mode 1 standards. Any request that the VCD might send using the 100% modulation

mode, is ignored, and the LRI64 remains in its current state. However, the LRI64 is, in fact,

operational for any degree of modulation index from between 10% and 30%.

The modulation index is defined as (a-b)/(a+b) where a and b are the peak and minimum

signal amplitude, respectively, of the carrier frequency, as shown in Figure 4.

Figure 4.

10% modulation waveform

Figure 5.

“1-out-of-4” coding example

Table 2.

10% modulation parameters

Parameter

Min

Max

hr

–

0.1 x (a-b)

hf

–

0.1 x (a-b)

AI06655B

tRFF

tRFSFL

tRFR

hr

hf

ab

t

AI06659B

75.52 µs

00

10

01

11

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