u6032b ATMEL Corporation, u6032b Datasheet - Page 6

• Manufacturer Part Number: u6032b
• Description: U6032b Automotive Lamp-outage Monitor Ic
• Manufacturer: ATMEL Corporation

4.8
6
ON, OFF Inputs, Pins 3 and 4
U6032B
I
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-actuated
switch) is recommended.
Pressing the push-button switch (pin 3 ON) leads to an activation of the relay after the debounce
time, t
de-energization of the relay. If the relay is not de-energized by the push-button switch, the out-
put 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
Figure 4-4
capacitor (15 pF) and Z-diode (7 V). It reacts to voltages greater than 2 V. The external protec-
tive resistor has a value of 20 k 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 resistor from the push-button switch to ground as
shown in
Figure 4-4.
Figure 4-5.
I
=
=
(12 - 7) V
------------------------ -
-----------------------------
R(= 20 k
V
20 k
Batt
3
, has ellapsed whereas the switching of pin 4 switch correspondingly leads to the
–
Figure 4-6 on page
shows the input circuit of U6032B. It has an integrated pull-down resistor (20 k ), RF
V
Z
Input Circuit
ON/OFF Function
0.25 mA
where V
Batt
V
Batt
V
Batt
= 12 V, V
7.
47 µF/
16 V
C
S
1
R
Z
20 k
1
= 7 V
R
1
8
510
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
1
is ON or OFF.
4771B–AUTO–11/05