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L9680 Datasheet(PDF) 197 Page - STMicroelectronics

Part # L9680
Description  Automotive advanced airbag IC for mid/high end applications
PDF  277 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9680 Datasheet(HTML) 197 Page - STMicroelectronics

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197/277
L9680
Safing logic
276
12.2
SPI sensor data decoding
Sensor data is regularly communicated with the main microcontroller through multiple SPI
messages. The L9680 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 51. Safing engine – 32-bit message decoding flow chart



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