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L9678P Datasheet(PDF) 144 Page - STMicroelectronics |
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L9678P Datasheet(HTML) 144 Page - STMicroelectronics |
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144 / 215 page  Safing logic L9678P, L9678P-S 144/216 DS11626 Rev 9 10 Safing logic Note: This function contains some known bugs, please refer to the Section 19: Errata sheet. 10.1 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 4 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 to 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. Two independent arming outputs, ARM1INT and ARM2INT, are also mapped internally to any of the integrated squib/pyroswitch drivers. |
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