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AN589 датащи(PDF) 5 Page - STMicroelectronics |
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AN589 датащи(HTML) 5 Page - STMicroelectronics |
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5 / 8 page ![]() 5/8 AN589 Figure 7. Ve/VR with DRIVER 2 voltage = 0 V Figure 8. Ve/VR with DRIVER 2 voltage = 12 V The waveforms of figure 6, 7 and 8 show parasitic overvoltages lower than in the simulation. This is largely due to the presence of line capacitance and a finite input impedance. The duration of the spikes is similar, so again they would be removed by the RS232 input sampling. The expanded view of Figure 7 given by Figure 9 quantifies the duration of the phenomenon. Chanel 1 20 s 5V Chanel 2 20 s 5V Ch 1 5 V ~ T/div20 s Ch 2 50mV X = Trig 1.28 div+CHAN 1 = 100 0 5V/Div 0 5V/Div Ve Vr 20 s/div Chanel 1 20 s 5V Chanel 2 20 s 5V Ch 1 5 V ~ T/div20 s Ch 2 50mV X = Trig 1.28 div+CHAN 1 = 100 0 5V/Div 0 5V/Div Ve Vr 20 s/div |
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