L9678P datasheet(169/203 Pages) STMICROELECTRONICS

169 / 203 page

DocID029274 Rev 3

169/203

L9678P, L9678P-S

Electrical characteristics

202

15.5

Watchdog

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

-40 °C

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

15.6

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

6IMOD_AUX

Aux oscillator

modulation index

SPI_CLK_CNF(AUX_SS_DIS=0)

7fOSC_LOW_TH

Main oscillator Low

Frequency Detection

Threshold

MHz

Table 20. Oscillators AC specifications (continued)

Symbol

Parameter

Conditions / Comments

Min

Typ

Max Unit

128

174

---------- ƒAUX



Table 21. Temporal watchdog timer AC specifications

N°

Symbol

Parameter

Condition

Min

Typ

Max

Unit

1TWDT1_TIMEOUT

Temporal watchdog

timeout

2.00

16.3

2TWDT1_RST

Temporal Watchdog

Reset Time

-0.9

1.1

Table 22. Reset DC specifications

N°

Symbol

Parameter

Condition

Min

Typ

Max

Unit

1VOH_RESET

RESET output voltage

ILOAD = -0.5 mA

VDDQ

-0.6

VDDQ

2VOL_RESET

ILOAD = 2.0 mA

0.4

3RPD_RESET

RESET pull down

resistance

RESET=VDDQ, Device OFF

100

135

kΩ

Table 23. Reset AC specifications

N°

Symbol

Parameter

Condition

Min

Typ

Max

Unit

1TRISE_RESET

Rise Time

80pF load, 20%-80%

1.00

µs

2TFALL_RESET

Fall Time

80pF load, 20%-80%

1.00

µs

3THOLD_RESET

Reset Hold Time

0.45

0.5

0.55

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