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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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L9965P Scheda tecnica(PDF) 27 Page - STMicroelectronics |
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L9965P Scheda tecnica(HTML) 27 Page - STMicroelectronics |
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27 / 104 page  Whenever one of the two signals FENH/FENL is detected as valid, the FSM moves to ARM state. If both FENH and FENL are detected as valid, the deployment takes place as both HS and LS switches are closed. It is possible to check the arming condition set by FENH and FENL reading the dedicated bits, respectively FENH_ARM and FENL_ARM. The deployment condition is latched: to ensure reliable deployment delivering a suitable amount of energy to the igniter, an ongoing deployment (FIRE_RUNNING bit set to 1) cannot be interrupted even if the trigger conditions disappear. After the deployment is complete, whatever the outcome is (FIRE_END bit set to 1 if no faults occur, FIRE_END_BY_FAULT bit se to 1 if a PS_OV or PGND_LOSS fault occurs), the device returns to NORMAL state. The Table 19 summarizes FENH/FENL decoder output according to the different configurations: Table 19. FENx decoder output behavior FENx_EN FENx_MODE FENx_LEVEL FENx input (deglitched) Decoder output 0 X X X Low 1 0 0 0 High 1 0 0 1 Low 1 0 1 0 Low 1 0 1 1 High 1 1 0 25% duty High 1 1 0 75% duty Low 1 1 1 25% duty Low 1 1 1 75% duty High L9965P Functional description DS14702 - Rev 4 page 27/104 |
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