L9679P datasheet(229/279 Pages) STMICROELECTRONICS

Part #	L9679P

Description	Automotive advanced airbag for mid/high end applications and cut-off battery IC

PDF	279 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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229 / 279 page

DS11627 Rev 7

229/279

L9679P

Electrical characteristics

278

18.4

Watchdog

All electrical characteristics are valid for the following conditions unless otherwise noted:

-40 °C  Ta  +95 °C, VINGOOD0  VIN  35 V

Table 28. Temporal watchdog timer AC specifications (WD1)

Symbol

Parameter

Condition

Min Typ Max Unit

TWDT1_TIMEOUT Temporal watchdog timeout

2.00 ms

16.3 ms

TWDT1_RST

Temporal watchdog reset time -

0.9

1.0

1.1

Table 29. Algorithmic watchdog timer DC specifications (WD2)

Symbol

Parameter

Condition

Min

Typ Max Unit

1 VOH_WD2LCKOUT

WD2LockOut output voltage

ILOAD = -0.5 mA

VCC-0.6

VCC

VOL_WD2LCKOUT

ILOAD = 2.0 mA

0.4

Table 30. Algorithmic watchdog timer AC specifications (WD2)

Symbol

Parameter

Condition

Min Typ Max Unit

TWDT2_TIMEOUT Algorithmic watchdog timeout -

TWDT2_RST

Algorithmic watchdog reset

time

0.9

1.0

1.1

3 TRISE_ WD2LCKOUT WD2LockOut rise time

50 pF load, 20%-80%

1.0

µs

4 TFALL_ WD2LCKOUT WD2LockOut fall time

50 pF load, 20%-80%

1.0

µs

fWD2_SEED

WD2 Seed Counter Rate

MHz

fosc

512

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