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L9678P bảng dữ liệu(PDF) 153 Page - STMicroelectronics

tên linh kiện L9678P
Giải thích chi tiết về linh kiện  Automotive user configurable airbag IC
PDF  203 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L9678P bảng dữ liệu(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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