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L9678P bảng dữ liệu(PDF) 151 Page - STMicroelectronics

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L9678P bảng dữ liệu(HTML) 151 Page - STMicroelectronics

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L9678P, L9678P-S
Safing logic
202
Figure 49. Safing engine diagnostic logic
A configurable mask for each internal ARMxINT signal is available for all of the integrated
deployment loops (refer to ARMx assignment registers (LOOP_MATRIX_ARMx) on
page 97). The un-masked ARMxINT signal for each loop will enable the respective loop
drivers (refer to Figure 21).
Activation of VSF (regulation rail for High Side Safing FET) occurs upon ARMxINT or
FENH/FENL, depending on SPI configuration (refer to Figure 17). Actual High Side Safing
FET activation still requires microcontroller signal.
L9678P is able to provide arming signals to external deployment loops by means of the
discrete output ARM pin. The ARM pin can either output an arming signal generated by the
integrated safing engine or an arming signal made by the combination of FENH and FENL
input signals, coming from external safing logic.
Figure 50. ARM output control logic



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