L9678P datasheet(178/215 Pages) STMICROELECTRONICS

178 / 215 page

Electrical characteristics

L9678P, L9678P-S

178/216

DS11626 Rev 9

16.5

Watchdog

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

-40 °C  Ta  +95 °C,VINGOOD1(max)  VIN  35 V

16.6

Reset

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

-40 °C  Ta  +95 °C; VINGOOD1(max)  VIN  35 V, VDDx(min)  VDDx  VDDx(max),

VDDQ = VDD5 or VDD3V3

IMOD_AUX

Aux oscillator

modulation index

SPI_CLK_CNF(AUX_SS_DIS=0)

7 fOSC_LOW_TH

Main oscillator Low

Frequency Detection

Threshold

MHz

Table 21. Oscillators AC specifications (continued)

Symbol

Parameter

Conditions / Comments

Min.

Typ.

Max. Unit

128

174

---------- ƒAUX



Table 22. Temporal watchdog timer AC specifications

N°

Symbol

Parameter

Condition

Min. Typ. Max. Unit

TWDT1_TIMEOUT

Temporal watchdog

timeout

2.00

16.3

TWDT1_RST

Temporal Watchdog

Reset Time

0.9

1.1

Table 23. Reset DC specifications

N°

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

VOH_RESET

RESET output voltage

ILOAD = -0.5 mA

VDDQ

-0.6

VDDQ

VOL_RESET

ILOAD = 2.0 mA

0.4

RPD_RESET

RESET pull down

resistance

RESET=VDDQ, Device OFF

100

135

kΩ

Table 24. Reset AC specifications

N°

Symbol

Parameter

Condition

Min. Typ. Max. Unit

TRISE_RESET

Rise Time

80pF load, 20%-80%

1.00

µs

TFALL_RESET

Fall Time

80pF load, 20%-80%

1.00

µs

THOLD_RESET Reset Hold Time

0.45

0.5

0.55

L9678P Datasheet(PDF) 178 Page - STMicroelectronics

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