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L9678P Datasheet(PDF) 159 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 159 Page - STMicroelectronics

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DS11626 Rev 9
159/216
L9678P, L9678P-S
Safing logic
214
Figure 52. Scrap ACL state diagram
A specific waveform needs to be present on this input in order to instruct L9678P to arm all
deployment loops. L9678P is designed to support the Additional Communication Line (ACL)
aspect of the ISO-26021 standard, which requires an independent hardwired signal (ACL) to
implement the scrapping feature. The disposal signal may come from either the vehicle's
service connector, or the systems main microcontroller, depending on the end customer's
requirements.
The arming function monitors the disposal PWM input (ACL pin) for a command to arm all
loops for vehicle end-of-life. The disposal signal characteristic is shown in Figure 53. To
remain in Arming state, at least three cycles of the ACL signal must be qualified. For the
device to qualify the periodic ACL signal, the period and duty cycle are checked. Two
consecutive cycles of invalid disposal signal are to be received to disqualify the ACL signal.
Figure 53. Disposal PWM signal
The disposal PWM signal cycle time and on time parameters can be found in the electrical
parameters tables.
GAPGPS01652
ACLHIGH
ACLTMR=0
SSM_RESET OR
((NOT SCRAP state) AND (NOT ARMING state)) /
ACLGOOD=0
ACLBAD=0
Falling edge &
ACLTMR > highmin
ACLLOW
ACLTMR > periodmin
& rising edge /
ACLGOOD++
ACLBAD=0
ACLTMR=0
ACLERROR
Rising edge OR
ACLTMR > periodmax /
ACLTMR=0
ACLTMR > highmax OR
Falling edge & ACLTIMER
< highmin /
ACLGOOD=0
ACLBAD++
ACLTMR > periodmax /
ACLGOOD=0
ACLBAD++
ACLTMR=0
Rising edge /
ACLTMR 0
=
ACLGOOD=0
ACLBAD++
GAPGPS01149
Cycle time
On time



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