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L9678P データシート(PDF) 112 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) 112 Page - STMicroelectronics

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Deployment drivers
L9678P, L9678P-S
112/203
DocID029274 Rev 3
Figure 23. Deployment driver block
6.1.1
Deployment current selection
Deployment current is programmed for all channels using the Deploy Configuration Register
(DCRx) shown in “Deployment Configuration register (DCRx).
If 1.75 A deployment current is selected, the 2 ms deployment time cannot be chosen. If a
SPI command with 2 ms and 1.75 A selection is received, L9678P will discard it and switch
to a 500 µs and 1.2 A selection instead. This misuse is flagged with the CHxDD bit in the
Deploy Status Register (DSR).
6.1.2
Deploy command expiration timer
Deploy commands are received for all channels using SPI communications. Once a deploy
command is received, it will remain valid for a specified time period selected in the Deploy
Configuration Register (DCRx). The deploy status and deploy expiration timer can be read
through the Deploy Status Register (DSRx). The deploy expiration timer is 6 bits and the
maximum time is 500 ms nominal.



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