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L9678P 데이터시트(PDF) 140 Page - STMicroelectronics

부품명 L9678P
상세설명  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P 데이터시트(HTML) 140 Page - STMicroelectronics

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Watchdog timer
L9678P, L9678P-S
140/216
DS11626 Rev 9
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.
The WDT/TM input pin must not be biased HIGH (WDT/TM > VWD_OVERRIDE_th) prior to
POR in order to have a proper start-up.
GAPGPS01659
WD1INIT
WD1A1
WD1B1
WD1B2
WD1A2
WD1_ERROR
SPI_WD1_B
SPI_WD1_A
SSM_RESET
TMR1>MIN &
SPI_WD1_A /
TMR1=0
Strobe WD1 refresh OK
TMR1>MIN &
SPI_WD1_B /
TMR1=0
Strobe WD1 refresh OK
TMR1>MAX OR
[TMR1<MIN & SPI_WD1_B]
TMR1>MAX OR
[TMR1<MIN & SPI_WD1_A]



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