U6046B / U6047B
Relay Control Output Behavior, Pin 2
Time functions (relay output) can be started or interrupted
by the three inputs i.e., ON, OFF or TOGGLE (Pins 3, 4
and 5).
The relay becomes active if the time function is triggered,
and the relay contact is interrupted after the elapse of
delay time, t
d
. There are two input possibilities:
whereas the switching of the Pin 4 switch correspond-
ingly leads to the relay being de-energized. If the relay is
not de-energized by the push-button switch, it becomes
disabled after the delay time, t
d
, is over.
Combined operation, “TOGGLE and ON/OFF” is not
possible due to the fact that there is only one debouncing
circuit. Debouncing functions on both sides i.e., when-
ever S
1
is ON or OFF.
If Pin 3 (input ON) is continuously closed, the delay time,
t
d
, still elapses and the relay is interrupted. This can be
used to generate a defined power-on-reset pulse to trigger,
for example, a delay time, t
d
, when the battery voltage,
V
Batt
, is applied.
Figure 10 shows the input circuit of U6046B. It has an
integrated pull-down resistance (20 k
W
), RF capacitor
(15 pF) and Z-diode (7 V). It reacts to voltages greater
than 2 V. The external protective resistor has a value of
20 k
W
and the push-button switch, S, is connected to the
battery as shown in the diagram.
Contact current, I, is calculated as follows:
I
I
V –V
+
R(
+
20 k
W
)
Batt
Z
Toggle Input, Figures 5 and 6
When the push-button (TOGGLE) switch, S
1
, is pressed
for the first time, the relay becomes active after the
debounce time, t
3
, i.e., the relay output, Pin 2, is active.
Renewed operation of S
1
causes the interruption of the
relay contact and the relay is disabled. Each operation of
the toggle switch, S
1
, changes (alters) the condition of the
relay output when the debounce time, t
3
, is exceeded i.e.,
the TOGGLE function.
If the relay output is not disabled by pressing the switch
S
1
, the output is active until the delay time, t
d
, is over.
ON, OFF Inputs, Pins 3 and 4,
Figures 7 and 8
To avoid simultaneous operation of both inputs, Pin 3
(ON) and Pin 4 (OFF), use of two-way contact with
centre-off position with spring returns (also known as
rocker-actuated switch) is recommended.
Pressing the push-button switch (Pin 3-ON) leads to the
activation of the relay after the debounce time, t
3
,
where V
Batt
+
12 V,
V
Z
+
7 V
It can be increased by connecting a 5.6 k
W
resistor from
the push-button switch to ground as shown in figure 18.
+
(12–7)
W
V
[
0.25 mA
20 k
V
Batt
V
Batt
R
1
C
1
47
m
F/
16 V
8
S3
510
W
R
2
C
2
C
1
20 k
W
20 k
W
47
m
F/
16 V
R
1
510
W
R
2
C
2
8
7
6
5
7
6
5
U6047B
U6046B
1
1
2
3
4
2 k
W
94 8753
2
3
4
2 k
W
S3
94 8754
Figure 7.
ON/OFF function U6046B
Figure 8.
ON/OFF function U6047B
4 (11)
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
TEMIC [ TEMIC SEMICONDUCTORS ]
