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STR720 データシート(PDF) 255 Page - STMicroelectronics |
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STR720 データシート(HTML) 255 Page - STMicroelectronics |
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255 / 401 page  STR720 - CONTROLLER AREA NETWORK (CAN) 255/401 The examples in Figure 38 show how short dominant noise spikes are filtered by synchronizations. In both examples the spike starts at the end of Prop_Seg and has the length of “Prop_Seg + Phase_Seg1”. In the first example, the Synchronization Jump Width is greater than or equal to the phase error of the spike’s edge from recessive to dominant. Therefore the Sample Point is shifted after the end of the spike; a recessive bus level is sampled. In the second example, SJW is shorter than the phase error, so the Sample Point cannot be shifted far enough; the dominant spike is sampled as actual bus level. Figure 38. Filtering of Short Dominant Spikes recessive dominant Sync_Seg Prop_Seg Phase_Seg1 Phase_Seg2 Spike Rx-Input Sample-Point Sample-Point Sample-Point Sample-Point recessive dominant Spike Rx-Input SJW ≥ Phase Error SJW < Phase Error 1 |
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