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L9680 Datasheet(PDF) 196 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) 196 Page - STMicroelectronics

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Safing logic
L9680
196/277
DocID029257 Rev 1
12
Safing logic
12.1
Safing logic overview
The integrated safing logic uses data from on-board and remote locations by decoding the
various SPI communications between the interfaces and the main microcontroller. The
safing logic has several programmable features enabling its ability to decode SPI
transmissions and can process data from up to 16 sensors. The operating mode involves
simple symmetrical data threshold comparisons, with the use of symmetrical or
asymmetrical counters. A high level diagram is shown in the figure below. Please note that
this top-level diagram is simplified, and references more detailed flowcharts to show a)
message decoding, b) valid data limits, c) effects of the 'combine' function, d) comparison to
thresholds and arming, and e) the setting of the 'compare complete bit. Four independent
arming outputs, ARM1INT, ARM2INT, ARM3INT and ARM4INT, are also mapped internally
to any of the integrated squib drivers.
Figure 50. Top level safing engine flow chart



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