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L9679P 数据表(PDF) 198 Page - STMicroelectronics |
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L9679P 数据表(HTML) 198 Page - STMicroelectronics |
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198 / 272 page  Safing logic L9679P 198/272 DocID029275 Rev 1 Comb (Combined Data) bit allows combining X and Y for off-axis oriented sensors. In this case, it is typical for such orientations to add or subtract the sensor response to translate the sensor signal to an on-axis response. Only couples of 16-bit long records have this feature (i.e. 1&2, 3&4, 5&6, 7&8, 9&10, 11&12). Records are added and subtracted and results compare against two thresholds. Safing engine will process data as follows: Use record(n) and record(n+1), where n = 1, 3, 5, 7, 9, 11. The matching inputs used for math combinations are processed only after both are captured. The sum of the two matching inputs will be compared to the threshold of record(n). The difference of the two records will be compared to the threshold of record(n+1). If the Comb feature was enabled on only one of the two records in a couple, math would be performed only on it as shown in Figure 54 Example of Combine Function operation: All items in the safing records, except En(Record Enable) bit, can be configured only in Diag state (refer to Figure 10). Additionally, the global bit to select internal or external safing engine is set in Init state. 12.3 In-frame and out-of-frame responses Some sensors will communicate data within the current communication frame while others will send data on the next communication frame. Sometimes this is sensor specific and sometimes this is due to the amount of data to be transmitted. A simplified diagram shows the basic communication differences of in and out of frame responses. In-frame example: Table 15. Example of combine function operation Record # Combine Bit Data Resulting value Record Threshold ARMSELx Configuration ARMINTx Result Record 1 0 12 12 48 ARMP 0 Record 2 0 50 50 48 ARMP 1 Record 3 0 50 12 48 ARMP 0 Record 4 1 12 50 – 12 = 38 48 ARMP 0 Record 5 1 12 12 + 50 = 62 48 ARMP 1 Record 6 0 50 50 48 ARMP 1 Record 7 1 50 12 + 50 = 62 48 ARMP 1 Record 8 1 12 50 – 12 = 38 48 ARMP 0 Record 9 1 12 50 + 12 = 62 -24 ARMN 0 Record 10 1 50 12 – 50 = -38 -24 ARMN 1 |
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