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L9678P 数据表(PDF) 140 Page - STMicroelectronics |
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L9678P 数据表(HTML) 140 Page - STMicroelectronics |
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140 / 203 page ![]() Safing logic L9678P, L9678P-S 140/203 DocID029274 Rev 3 10.2 SPI sensor data decoding Sensor data is regularly communicated with the main microcontroller through multiple SPI messages. Since not all communications between sensors and the microcontroller contain data, it is important for the decoder to properly sort the communications and extract only the targeted data. The solution involves defining specific masking functions, contained within independent safing records, programmed by the user. The following figures detail the SPI message decoding methodology and the ensuing comparisons of valid sensor data to the programmed thresholds. Figure 40. Safing engine - 16-bit message decoding flow chart |
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