L99MM70XP datasheet(35/68 Pages) STMICROELECTRONICS

35 / 68 page

L99MM70XP

Electrical characteristics

Doc ID 022637 Rev 2

35/68

8.5

Reset output (VCC supervision)

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

flows into the pin. 4 V

 V

S  28 V; Tamb = -40 °C...125 °C, unless otherwise specified.

8.6

Watchdog

4.5 V

 V

S  28 V; Tamb = -40 °C...125 °C, unless otherwise specified, see Figure 10 and

Figure 11.

ICMPfal

Current consumption falling

threshold

Falling current (deactivated

current monitor)

1.3

2.7

ICMPhys

Current consumption

hysteresis

0.5

VCCfail

VCC fail threshold

VCC forced

Table 12.

Voltage regulator VCC (continued)

Symbol

Parameter

Test condition

Min. Typ. Max. Unit

Table 13.

Reset output (VCC supervision)

Symbol

Parameter

Test condition

Min.

Typ. Max.

Unit

VRT1

Reset threshold voltage1

VVCC increasing

CR1/Bit4 = 0(1)

Delay time see tWDR below (Section 8.6: Watchdog).

4.6

4.7

4.85

VVCC decreasing

CR1/Bit4 = 0

4.5

4.6

4.7

VRT1HYST

Threshold voltage 1

hysteresis

0.1

VRT2

Reset threshold voltage2

VVCC increasing

CR1/Bit4 = 1(1)

3.6

3.7

3.9

VVCC decreasing

CR1/Bit4 = 1

3.0

3.3

3.5

VRT2HYST

Threshold voltage 2

hysteresis

0.4

VNRES

Reset Pin low output voltage

VCC >1V, INRES =1mA

0.2

0.4

RNRES

Reset pull up int. resistor

VNRES = 4 V

110

204



tRR

Reset reaction time

CNRES = 100 pF,

INRES =1 mA

µs

Table 14.

Watchdog

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

tLW

Watchdog cycle time

100

134

180

tWDR

Watchdog reset pulse time

1.5

2.3

2.9

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