L9942 datasheet(14/37 Pages) STMICROELECTRONICS

14 / 37 page

3 Electrical specifications

L9942

14/37

3.4.2

Over- and undervoltage detection

VS = 7 to 20 V, VCC = 3.0 to 5.3 V, EN=VCC, Tj = -40 to 150 °C, IREF = -200 µA, unless

otherwise specified. The voltages are referred to GND and currents are assumed positive,

when the current flows into the pin.

Table 8.

Over- and undervoltage detection .

Figure 6.

VS Monitoring

3.4.3

Reference Current Output

VS = 7 to 20 V, VCC = 3.0 to 5.3 V, EN=VCC, Tj = -40 to 150 °C, IREF = -200 µA, unless

otherwise specified. The voltages are referred to GND and currents are assumed positive,

when the current flows into the pin.

Table 9.

Reference Current Output

The device works properly without the external resistor at pin REF. In this case it doesn't have

to fullfill all specified parameters.

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VSUV ON

VS UV-threshold voltage

VS increasing

6.90

VSUV OFF

VS UV-threshold voltage

VS decreasing

4.8

VSUV hyst

VS UV-hysteresis

VSUV ON -VSUV OFF

0.3

VSOV OFF

VS OV-threshold voltage

VS increasing

VSOV ON

VS OV-threshold voltage

VS decreasing

VSOV hyst

VS OV-hysteresis

VSOV OFF -VSOV ON

0.5

VPOR OFF

power-on-reset threshold

VCC increasing

2.6

2.9

VPOR ON

power-on-reset threshold

VCC decreasing

2.00

2.3

VPOR hyst

power-on-reset hysteresis

VPOR OFF -VPOR ON

0.11

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VREF

reference voltage range

IREF = -200 µA

1.05

1.25

1.45

IREFshorted

reference current

threshold shorted pin REF

register6 bit7 RERR = 1

-250

µA

IREFopen

reference current

threshold open pin REF

register6 bit7 RERR = 1

-150

µA

VSUV ON

VSUV OFF

VSOV OFF

VSOV ON

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