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L9678P データシート(PDF) 153 Page - STMicroelectronics

部品番号 L9678P
部品情報  Automotive user configurable airbag IC
PDF  203 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P データシート(HTML) 153 Page - STMicroelectronics

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L9678P, L9678P-S
Safing logic
202
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 airbag disposal. 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.



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