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L9680 bảng dữ liệu(PDF) 209 Page - STMicroelectronics

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L9680 bảng dữ liệu(HTML) 209 Page - STMicroelectronics

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L9680
Safing logic
276
Figure 61. 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.



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