L4988D datasheet(6/32 Pages) STMICROELECTRONICS

6 / 32 page

Block diagram and pin configuration

L4988

6/32

DS5334 Rev 8

Figure 2.Pins configuration

Table 2. Pins description

name

SO8(D)

S020(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.

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.

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

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