U6032B-FP ATMEL Corporation, U6032B-FP Datasheet - Page 6

• Manufacturer Part Number: U6032B-FP
• Description: AUTOMOTIVE TOGGLE SWITCH IC
• Manufacturer: ATMEL Corporation

ON, OFF Inputs, Pins 3
and 4
6
U6032B
To avoid simultaneous operation of both inputs, pin 3 (ON) and pin 4 (OFF), the use of a
two-way contact with centre-off position with spring returns (also known as rocker-actu-
ated switch) is recommended.
Pressing the push-button switch (pin 3 ON) leads to an activation of the relay after the
debounce time, t
leads to the de-energization of the relay. If the relay is not de-energized by the push-but-
ton switch, the output remains active.
Combined operation “TOGGLE” and “ON/OFF” is not possible due to the fact that there
is only one debouncing circuit. Debouncing is possible in both modes, i.e., whenever S
is ON or OFF.
Figure 6 shows the input circuit of U6032B. It has an integrated pull-down resistor
(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.
The contact current, I, is calculated as follows:
It can be increased by connecting a 5.6 k W resistor from the push-button switch to
ground as shown in Figure 8 on page 7.
Figure 6. Input Circuit
Figure 7. ON/OFF Function
I
I
=
=
----------------------------- -
R(= 20 k W )
(12 - 7) V
------------------------ -
V
20 k W
Batt
–
V
Z
»
0.25 mA
where V
3
, has ellapsed whereas the switching of pin 4 switch correspondingly
V
V
Batt
Batt
Batt
= 12 V, V
47 µF/
16 V
C
S
1
R
20 k
1
R
1
8
510
Z
= 7 V
Pin 3, 4, 5
7
2
U6032B
7 V
R
2
6
3
C
2
15 pF
4
5
20 k
2 V
20 k
20 k
+
-
S
3
4771A–AUTO–11/03
1