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L9679P bảng dữ liệu(PDF) 204 Page - STMicroelectronics

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L9679P bảng dữ liệu(HTML) 204 Page - STMicroelectronics

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Safing logic
L9679P
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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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