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L9779WD-SPI bảng dữ liệu(PDF) 24 Page - STMicroelectronics

tên linh kiện L9779WD-SPI
Giải thích chi tiết về linh kiện  Smart reset function
PDF  141 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9779WD-SPI bảng dữ liệu(HTML) 24 Page - STMicroelectronics

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L9779WD-SPI
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DocID027721 Rev 2
An additional feature for the starter delay drivers is that the starters are only shut-off after
the time delay THOLD if the SEO condition is still active.
The ignition stages are not affected by the SEO signal. This is different from the WDA signal
which additionally switches off the ignition stages.
To avoid misunderstandings one must be aware that the SEO function has nothing to do
with the WDA function and is not a part of the WDA module. The SEO function is related to
the key switch, not to the WDA function. The SEO function adds an additional safety
procedure for switching off.
Other functions than the injector stages and the starter relay drivers are not affected or
influenced by the SEO signal.
With the falling edge of KEY_ON a timer is started which disables the mentioned power
stages after 200 ms to 250 ms (typ. 225 ms). The timer is clocked by an internal oscillator.
The timer does not depend on any µC clock or function. The µC still has control on switching
on/off drivers during SEO time. This function is configured by CONFIG_REG6 register.
Figure 8. Power-down sequence without power latch mode



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