LRI512 datasheet(4/54 Pages) STMICROELECTRONICS

Part #	LRI512

Description	Memory TAG IC 512 bit High Endurance EEPROM 13.56MHz, ISO 15693 Standard Compliant with E.A.S.

PDF	54 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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4 / 54 page

LRI512

4/54

COMMUNICATION SIGNAL FROM VCD TO LRI512

Since the LRI512 is fully compliant with the

ISO15693 recommendation, the descriptions and

illustrations that follow are very heavily based on

those of the ISO/IEC documents: ISO/IEC 15693-

2:2000(E) and ISO/IEC 15693-3:2001(E). This

has been done with the kind permission of the ISO

Communications between the VCD and the

LRI512 takes place using the modulation principle

of ASK (amplitude modulation). Two modulation

indices are used, 10% and 100%. The LRI512 de-

codes both. The VCD determines which index is

used.

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.

Depending of the choice made by the VCD, a

“pause” will be created as described in Figure 3

and Figure 4.

The LRI512 is operational for any degree of mod-

ulation index from between 10% and 30%.

Figure 3. 100% Modulation Waveform

Table 3. 10% Modulation Parameters

Figure 4. 10% Modulation Waveform

0.1 x (a-b)

max

0.1 x (a-b)

max

AI06683

tRFF

tRFSBL

tRFR

105%

100%

95%

60%

AI06655

tRFF

tRFSFL

tRFR

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