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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L9300 데이터시트(PDF) 34 Page - STMicroelectronics |
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L9300 데이터시트(HTML) 34 Page - STMicroelectronics |
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34 / 178 page  VDA sensor decoding For the three level wheel speed sensor, additional information is Manchester encoded between two consecutive speed pulses. The device measures each speed pulse duration and its value is used as time base for Manchester decoder which provides decoding for the bit [0:8] shown in the figure below. The number of the data log bit depends on the speed so that the device is able to inform the microcontroller about the number of bit effectively received. Figure 18. Definition of speed pulse and data log bits South Terminal North Terminal North Terminal Initial bit Speed pulse Data log bits 0 1 2 3 4 5 6 7 8 I_mid(2XI-low) I_high(4XI-low) I_low(7mA) GADG1307171618PS Normal sensor operation Normal operation frames are composed as shown in the figure below. Figure 19. Signal monitoring: normal speed bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 Parity tp/2 tp/2 tp tp tp tp tp tp tp tp tp tp 1 1 0 1 1 0 1 0 1 Initial bit Speed pulse Sensor output Current Data log Speed pulse GADG1407170832PS L9300 Power supply DS12258 - Rev 5 page 34/178 |
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