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M24LR64E-R 数据表(PDF) 45 Page - STMicroelectronics |
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M24LR64E-R 数据表(HTML) 45 Page - STMicroelectronics |
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45 / 140 page  M24LR64E-R Communication signal from VCD to M24LR64E-R Doc ID 022712 Rev 3 45/140 8 Communication signal from VCD to M24LR64E-R Communications between the VCD and the M24LR64E-R take place using the modulation principle of ASK (Amplitude shift keying). Two modulation indexes are used, 10% and 100%. The M24LR64E-R decodes both. The VCD determines which index is used. The modulation index is defined as [a – b]/[a + b], where a is the peak signal amplitude, and b the minimum signal amplitude of the carrier frequency. Depending on the choice made by the VCD, a “pause” is created as described in Figure 14 and Figure 15. The M24LR64E-R is operational for the 100% modulation index or for any degree of modulation index between 10% and 30% (see Table 124). Figure 14. 100% modulation waveform 105% a 95% 5% 60% Carrier Amplitude t t 2 t 1 t 3 t 4 Min (µs) t1 6,0 t2 2,1 t3 0 Max (µs) 9,44 t1 4,5 t4 0 0,8 b The clock recovery shall be operational after t4 max. ai15793 |
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