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L9679P Datasheet(PDF) 204 Page - STMicroelectronics |
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L9679P Datasheet(HTML) 204 Page - STMicroelectronics |
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204 / 279 page  Safing logic L9679P 204/279 DS11627 Rev 7 Figure 60. ARMx input/output control logic 12.5.1 Arming pulse stretch Upon a valid command processed by the safing logic, the Dwell bit to stretch the arming time assertion (dwell time) applies to each safing record and is used to help safe the deployment sequence to avoid undesired behaviour. Once dwell time has started, it will continue, regardless of the En (Record Enable) bit. Dwell will be truncated in case of SSM reset. Dwell values in the safing records are transferred to the ARMx signals. A dedicated counter is designed for each ARMx output pin. If different dwell values are assigned to the same ARMx, the longer value is used. Dwell times can only be extended, not reduced. If the remaining dwell time is less than the new dwell extension setting, the new setting will be loaded into the dwell counter. Dwell times are user programmable. The behaviour of the pulse stretch timer is shown below. WD1_LOCKOUT WD2_LOCKOUT SSM_RESET ARM1REQ WD1_RUN Safing Engine WD1_OVERRIDE SAFESEL ARM2REQ ARM2 0 1 ARM2INT ARM3REQ ARM3 0 1 ARM3INT ARM4REQ ARM4 0 1 ARM4INT ARM1 0 1 ARM1INT Pulse test PT_x state=1 (x = WAIT or 1..12) GAPGPS02299 |
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