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M24LR64-R 数据表(PDF) 39 Page - STMicroelectronics |
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M24LR64-R 数据表(HTML) 39 Page - STMicroelectronics |
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39 / 126 page  M24LR64-R Communication signal from VCD to M24LR64-R Doc ID 15170 Rev 8 39/126 8 Communication signal from VCD to M24LR64-R Communications between the VCD and the M24LR64-R takes place using the modulation principle of ASK (Amplitude Shift Keying). Two modulation indexes are used, 10% and 100%. The M24LR64-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” will be created as described in Figure 14 and Figure 15. The M24LR64-R is operational for any degree of modulation index from between 10% and 30%. Figure 14. 100% modulation waveform Table 16. 10% modulation parameters Symbol Parameter definition Value hr 0.1 x (a – b) max hf 0.1 x (a – b) max AI06683 tRFF tRFSBL tRFR 105% a t 100% 95% 60% 5% |
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