L9678P datasheet(135/203 Pages) STMICROELECTRONICS

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L9678P 데이터시트(PDF) 135 Page - STMicroelectronics

부품명	L9678P

상세설명	Automotive user configurable airbag IC

PDF	203 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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135 / 203 page

DocID029274 Rev 3

135/203

L9678P, L9678P-S

Watchdog timer

202

Figure 37. Watchdog timer refresh diagram

8.2

Watchdog reset assertion timer

Upon a watchdog reset, the watchdog logic will momentarily assert the RESET pin for time

duration twdrst. When the RESET pin has been asserted through the watchdog reset

assertion timer, stored faults are maintained and can be read by the microcontroller via SPI

following the RESET period.

8.3

Watchdog timer disable input (WDT/TM)

This input pin has a passive pull-down and is used to disable the watchdog timer. The state

of this pin can be read by SPI through the WDTDIS_S bit in the GSW register. When

WDT/TM pin is asserted, the watchdog timer is disabled, the timer is reset to its starting

value and no faults are generated.

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