LRI2K datasheet(14/89 Pages) STMICROELECTRONICS

Part #	LRI2K

Description	2048-bit EEPROM tag IC at 13.56 MHz, with 64-bit UID and kill code, ISO 15693 and ISO 18000-3 Mode 1 compliant

PDF	89 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

14 / 89 page

Communication signal from VCD to LRI2K

LRI2K

14/89

Communication signal from VCD to LRI2K

Communications between the VCD and the LRI2K take place using the modulation principle

of ASK (amplitude shift keying). Two modulation indexes are used, 10% and 100%. The

LRI2K decodes both. The VCD determines which index is used.

The modulation index is defined as [a – b]/[a + b] where a is the peak signal amplitude and b

the minimum signal amplitude of the carrier frequency.

Depending on the choice made by the VCD, a "pause" will be created as described in

Figure 3 and Figure 4.

The LRI2K is operational for any degree of modulation index between 10% and 30%.

Figure 3.

100% modulation waveform

Figure 4.

10% modulation waveform

Table 3.

10% modulation parameters

Symbol

Parameter definition

Value

0.1 x (a – b)

max

0.1 x (a – b)

max

AI06683

tRFF

tRFSBL

tRFR

105%

100%

95%

60%

AI06655

tRFF

tRFSFL

tRFR

LRI2K Datasheet(PDF) 14 Page - STMicroelectronics