L9952GXP datasheet(37/68 Pages) STMICROELECTRONICS

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L9952GXP

Electrical characteristics

Doc ID 13518 Rev 5

37/68

7.6

Reset generator (V1 supervision)

The voltages are referred to GND and currents are assumed positive, when the current

flows into the pin. 5.25V < VS = 18V; Tj = -40 to 130 °C, unless otherwise specified.

7.7

Watchdog

6V < VS < 18V; 4.8V < V1 < 5.2V; Tj = -40 to 130 °C, unless otherwise specified

Table 15.

Reset generator

Item

Symbol

Parameter

Test condition

Min.

Typ. Max. Unit

7.6.1

VRT1

Reset threshold voltage1

VS, VV1 inc. /

decreasing

4.5

4.63

4.75

7.6.2

VRT2

Reset threshold voltage2

VS, VV1 inc. /

decreasing

4.25

4.37

4.5

7.6.3

VRESET

Reset pin low output

voltage

V1 > 1V,

IRESET = 1mA

0,2

0,4

7.6.4

RRESET

Reset pull up int. resistor

110

204

7.6.5

tRR

Reset reaction time

@Iload = 1mA

µs

7.6.6

V1 under-voltage filter time

µs

Table 16.

Watchdog (1)

See Figure 13.

Item

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

7.7.1

tLW

Long open window

48,75

81,25

7.7.2

tCW

Closed window

4.5

7.5

7.7.3

tOW

Open window

7.5

12.5

7.7.4

tWDR

Watchdog reset pulse time

1.5

2. 5

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