參數(shù)資料
型號(hào)： LRI512-C40
廠商： 意法半導(dǎo)體
元件分類(lèi)： DRAM
英文描述： EEPROM
中文描述： EEPROM的
文件頁(yè)數(shù)： 4/54頁(yè)
文件大?。?/td> 351K
代理商： LRI512-C40
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
Copyright Office.
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
hr
0.1 x (a-b)
max
hf
0.1 x (a-b)
max
AI06683
tRFF
tRFSBL
tRFR
105%
100%
95%
a
t
60%
5%
AI06655
tRFF
tRFSFL
tRFR
hr
hf
a
b
t
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