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L9679P Datasheet(PDF) 191 Page - STMicroelectronics

No. de pieza L9679P
Descripción Electrónicos  Automotive advanced airbag IC for mid/high end applications
PDF  272 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P Datasheet(HTML) 191 Page - STMicroelectronics

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L9679P
Safing logic
271
12.2
SPI sensor data decoding
Sensor data is regularly communicated with the main microcontroller through multiple SPI
messages. The L9679P monitors SPI traffic on MISO_RS bus. 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 50. Safing engine – 32-bit message decoding flow chart



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