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L9679P Datasheet(PDF) 202 Page - STMicroelectronics

Part # L9679P
Description  Automotive advanced airbag for mid/high end applications and cut-off battery IC
PDF  279 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P Datasheet(HTML) 202 Page - STMicroelectronics

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Safing logic
L9679P
202/279
DS11627 Rev 7
Figure 58. Safing engine arming flow diagram
i++
i = N?
POS_COUNT[i]
>= ARMP_TH?
ARMP = 1
Y
N
ARMSEL[i] =
00, 01, or 11?
ARM1[i]=1 &
TIMER_CNT1<
DWELL[i]
ARM2[i]=1 &
TIMER_CNT2<
DWELL[i]
TIMER_CNT1=
DWELL[i]
TIMER_CNT2=
DWELL[i]
Y
Y
N
NN
ARMP = 0
ARMSEL[i] =
00, 10, or 11?
Y
Y
Y
TIMER_CNT1
> 0?
ARM1INT=1
ARM1INT=0
Y
N
TIMER_CNT2
> 0?
ARM2INT=1
ARM2INT=0
Y
N
NEG_COUNT[i]
>= ARMN_TH?
ARMN = 1
Y
N
ARMN = 0
N
i=1
N
TIMER_CNTx is a 10 bit
down counter always
running at 2ms
TIMER_CNTx control
extends to 4 for high/mid
ARMxINT control extends
to 4 for high/mid
START
N=5 (L9678)
N=13 (L9679)
N=17 (L9680)
GAPGPS02297



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