LRI64-A1S STMICROELECTRONICS [STMicroelectronics], LRI64-A1S Datasheet - Page 7

• Manufacturer Part Number: LRI64-A1S
• Description: Memory TAG IC, 64-bit Unique ID with WORM User Area 13.56MHz, ISO15693 and ISO18000-3 Mode 1 Compliant
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

COMMUNICATION SIGNAL FROM VCD TO LRI64
Communications between the VCD and the LRI64
involves a type of Amplitude Modulation called
Amplitude Shift Keying (ASK).
The LRI64 only supports the 10% modulation
mode specified in ISO 15693 and ISO 18000-3
Mode 1 standards. Any request that the VCD
might send using the 100% modulation mode, is
ignored, and the LRI64 remains in its current state.
However, the LRI64 is, in fact, operational for any
degree of modulation index from between 10%
and 30%.
Figure 5. 10% Modulation Waveform
Figure 6. “1-out-of-4” Coding Example
75.52 µs
10
a
tRFF
tRFSFL
b
75.52 µs
tRFR
00
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,
as shown in
Table 2. 10% Modulation Parameters
Parameter
75.52 µs
hr
01
hr
hf
Figure 5.
Min
–
–
hf
75.52 µs
11
0.1 x (a-b)
0.1 x (a-b)
AI06659B
AI06655B
Max
t
LRI64
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