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L9678P Datasheet(PDF) 140 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag IC
PDF  203 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 140 Page - STMicroelectronics

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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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