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LRI64-A1S/XXX Datasheet(PDF) 7 Page - STMicroelectronics |
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LRI64-A1S/XXX Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 38 page  7/38 LRI64 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%. 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 Figure 5. Table 2. 10% Modulation Parameters Figure 5. 10% Modulation Waveform Figure 6. “1-out-of-4” Coding Example Parameter Min Max hr – 0.1 x (a-b) hf – 0.1 x (a-b) AI06655B tRFF tRFSFL tRFR hr hf ab t AI06659B 75.52 µs 75.52 µs 75.52 µs 75.52 µs 00 10 01 11 |
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