U6046B Datasheet, PDF (5/13 Pages) TEMIC Semiconductors – Rear Window Heating Timer

U6046B
Figure 5. TOGGLE Function
V _Batt
R₁
C₁
510 W
C₂
R₂
47 mF/
16 V ₈
7
6
S1
20 kW
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U6046B
1
2
3
4
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 inter-
rupted after the elapse of delay time, t_d. There are two input possibilities:
Toggle Input
When the push-button (TOGGLE) switch, S₁, is pressed for the first time, the relay
becomes active after the debounce time, t₃, i.e., the relay output, pin 2, is active (see
Figure 5).
Renewed operation of S₁ causes the interruption of the relay contact and the relay is
disabled. Each operation of the toggle switch, S₁, changes (alters) the condition of the
relay output when the debounce time, t₃, is exceeded i.e., the TOGGLE function.
If the relay output is not disabled by pressing the switch S₁, the output is active until the
delay time, t_d, is over.
ON, OFF Inputs (Pins 3 and 4) To avoid simultaneous operation of both inputs, pin 3 (ON) and pin 4 (OFF), use of two-
way contacts with a centre-off position with spring returns (also known as rocker-actu-
ated switch) is recommended (see Figure 6).
Pressing the push-button switch (pin 3-ON) leads to the activation of the relay after the
debounce time, t₃, whereas the switching of the Pin 4 switch correspondingly 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 because both inputs are
connected to the same debounce stage. Debouncing functions on both edges i.e.,
whenever S₁ 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.
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4674A–AUTO–01/03