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L9678P bảng dữ liệu(PDF) 26 Page - STMicroelectronics

tên linh kiện L9678P
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L9678P bảng dữ liệu(HTML) 26 Page - STMicroelectronics

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Start-up power control
L9678P, L9678P-S
26/203
DocID029274 Rev 3
Figure 8. Normal power down sequence - VIN controlled
4.2.6
Operating states
Different states can be identified while operating the device. These states allow safe and
predictable initialization, test, operation and end of line disposal of the part (scrapping).
As soon as the RESET signal is de-asserted at the beginning of the ACTIVE mode, the
microcontroller powers up. At this stage, L9678P is in the Init state: during this state the
device must be initialized by the controller. In particular, the watchdog timer window can be
programmed during this state.
When the watchdog service begins (upon the first successful watchdog feed), the device
switches to Diag state for diagnostics purposes. The remaining configuration of the device is
allowed in this state, in particular for safing records and deployment masks. Several tests
are also enabled while in this state and all these tests are mutually exclusive to one another.
HS and LS switch tests of the squib drivers can only be processed during this diag state.
Also high side safing FET can only be run during this state. When not in diag state, any



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