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LRI64 Datasheet(PDF) 11 Page - STMicroelectronics |
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LRI64 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 52 page LRI64 Communication signal from VCD to LRI64 11/52 5 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 4. Figure 4. 10% modulation waveform Figure 5. “1-out-of-4” coding example Table 2. 10% modulation parameters 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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