L4989MD013TR Просмотр технического описания (PDF) - STMicroelectronics
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L4989MD013TR Datasheet PDF : 19 Pages
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Block diagram and pin configuration
L4989
Table 2. Pins description
Pin
name
SO-8(D)
S0-20(MD)
Function
WEn
1
Watchdog Enable input
1
If high watchdog functionality is active
Gnd
2
4
Ground reference
Ground.
Gnd
5, 6, 15, 16
Connected these pins to a heat spreader ground
Res
3
Reset output.
7
It is pulled down when output voltage goes below Vo_th
or frequency at Wi is too low.
Reset timing adjust.
Vcr
4
10
A capacitor between Vcr pin and gnd, sets the reset
delay time (trd)
t(s) Vcw
5
Watchdog timer adjust
11
A capacitor between Vcw pin and gnd, sets the time
response of the watchdog monitor.
roduc Wi
6
Watchdog input.
14
If the frequency at this input pin is too low, the Reset
output is activated.
te P Vo
7
Voltage regulator output
17
Block to ground with a capacitor >100nF (needed for
regulator stability)
sole Vs
8
Supply voltage
20
Block to ground directly at IC pin with a capacitor
Ob N.C.
2, 3, 8, 9, 12,
13, 18, 19
Not connected
t(s) - Figure 2. Pins configuration
Produc WEn
teGND
le Res
Obso Vcr
1
8
2 SO-8 7
3
6
4
5
Vs
Vo
Wi
Vcw
WEn
N.C.
N.C.
GND
GND
GND
Res
N.C.
N.C.
1
20
2
19
3
18
4
17
5 SO-20 16
6
15
7
14
8
13
9
12
Vs
N.C.
N.C.
Vo
GND
GND
Wi
N.C.
N.C.
Vcr
10
11
Vcw
6/19
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