lri2k STMicroelectronics, lri2k Datasheet - Page 14

• Manufacturer Part Number: lri2k
• Description: 13.56 Mhz, 2048-bit Eeprom Tag Ic With 64-bit Uid And Kill Code, Iso 15693 And Iso 18000-3 Mode 1 Compliant
• Manufacturer: STMicroelectronics

Communication signal from VCD to LRI2K
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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
The LRI2K is operational for any degree of modulation index between 10% and 30%.
Figure 3.
Table 3.
Figure 4.
Symbol
and
hr
hf
a
100% modulation waveform
10% modulation parameters
10% modulation waveform
Figure
tRFF
4.
105%
100%
tRFSFL
60%
95%
5%
a
b
tRFR
Parameter definition
tRFF
0.1 x (a – b)
0.1 x (a – b)
tRFSBL
tRFR
hr
AI06683
t
hf
Value
max
max
AI06655
t
LRI2K