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L9965P 데이터시트(PDF) 27 Page - STMicroelectronics

부품명 L9965P
상세설명  Automotive single channel pyro-fuse driver
PDF  104 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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L9965P 데이터시트(HTML) 27 Page - STMicroelectronics

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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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