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L9679E bảng dữ liệu(PDF) 84 Page - STMicroelectronics

tên linh kiện L9679E
Giải thích chi tiết về linh kiện  Automotive battery cut-off circuit and airbag system expansion IC
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L9679E bảng dữ liệu(HTML) 84 Page - STMicroelectronics

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Figure 23. Remote sensor synchronization pulses
GADG0903181545PS
SATFD4
SATFD3
SATFD2
SATFD1
SATSYNC
To guarantee sync pulse shaping and minimum sync pulse amplitude (Vt2) there are constraints on the minimum
delta voltage between VSYNC and VSAT supplies.
For VSYNC supply large enough (VSYNC ≥ VRSUbase + 4.8 V), the interface regulate the sync pulse (regulation
mode) and Vt2 amplitude is guaranteed.
For VSYNC supply lower, the sync pulse amplitude is limited by the drop across the FET RDSon so designer shall
consider a lower amplitude for it.
In case L9679E IC is supplied directly by the SB1 system chip, the worst case in terms of delta between VSYNC
and VSAT can be considered equal to 4.2 V. In this case the min Vt2 that the IC is able to guarantee is indicated
by parameter Vt2_low.
L9679E
Remote sensor interface
DS12485 - Rev 8
page 84/127



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