L4993 datasheet(6/30 Pages) STMICROELECTRONICS

6 / 30 page

Block diagram and pins description

L4993

6/30

Figure 2.

Pins configuration

Table 2.

Pins description

name

SO-8 (D)

SO-20 (MD)

Function

WEn

Watchdog Enable input

If high watchdog functionality is active

Gnd

Ground reference

Gnd

5, 6, 15, 16

Ground

Connected these pins to a heat spreader ground

Res

Reset output.

It is pulled down when output voltage goes below Vo_th

or frequency at Wi is too low.

Leave floating if not used.

Vcr

Reset timing adjust.

A capacitor between Vcr pin and gnd, sets the reset

delay time (trd)

Vcw

Watchdog timer adjust

A capacitor between Vcw pin and gnd, sets the time

response of the watchdog monitor.

Watchdog input.

If the frequency at this input pin is too low, the Reset

output is activated.

Connect to ground if not used

Vos

717

Voltage regulator output

Block to ground with a capacitor >100nF (needed for

regulator stability)

Supply voltage

Block to ground directly at IC pin with a capacitor

N.C.

2, 3, 8, 9, 12,

13, 18, 19

Not connected

WEn

GND

Res

Vcr

Vos

Vcw

WEn

N.C.

GND

Res

N.C.

Vcr

N.C.

Vos

GND

N.C.

Vcw

SO-8

SO-20

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