LRI512 데이터 시트보기 (PDF) - STMicroelectronics
부품명
상세내역
제조사
LRI512
STMicroelectronics
LRI512 Datasheet PDF : 54 Pages
| |||
LRI512
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
Copyright Office.
Figure 3. 100% Modulation Waveform
a
105%
100%
95%
Communications between the VCD and the
60%
LRI512 takes place using the modulation principle
of ASK (amplitude modulation). Two modulation
indices are used, 10% and 100%. The LRI512 de-
5%
codes both. The VCD determines which index is
used.
The modulation index is defined as [a-b]/[a+b]
tRFF
tRFR
tRFSBL
where a and b are the peak and minimum signal
amplitude, respectively, of the carrier frequency.
t
AI06683
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%.
Table 3. 10% Modulation Parameters
hr
0.1 x (a-b)
max
hf
0.1 x (a-b)
max
Figure 4. 10% Modulation Waveform
hr
tRFF tRFSFL tRFR
a
b
hf
t
AI06655
4/54
Share Link: