ATMEL U6032B

Features
•
•
•
•
•
•
•
•
Debounce Time: 0.3 ms to 6 s
RC Oscillator Determines Switching Characteristics
Relay Driver with Z-diode
Debounced Input for Toggle Switch
Three Debounced Inputs: ON, OFF and TOGGLE
Load-dump Protection
RF Interference Protection
Protection According to ISO/TR7637-1 (VDE 0839)
Description
Automotive
Toggle Switch
IC
The bipolar integrated circuit U6032B is designed as a toggle switch. The device,
which has a defined power-on status, can be used to control electrical loads, for example, fog lamps, high/low beam or heated windows for automotive applications.
U6032B
Figure 1. Block Diagram with External Circuit
C2
OSC
47 µF
R2
6
Oscillator
Vstab 7
C1
VS 8
Stabilization
Power-on reset
Load-dump detection
R1
510 Ω
VBatt
1
GND
Frequency divider
3
ON
2
4
OFF
Debouncing
Relay-control output
5
TOGGLE
Rev. 4771A–AUTO–11/03
Pin Configuration
Figure 2. Pinning DIP8/SO8
GND
1
8
VS
RELAY
2
7
VSTAB
ON
3
6
OSC
OFF
4
5
TOGGLE
Pin Description
2
Pin
Symbol
1
GND
2
RELAY
3
ON
Function
Reference point, ground
Relay control output
Switch-on input
4
OFF
5
TOGGLE
Switch-off input
6
OSC
RC oscillator input
7
VSTAB
Stabilized voltage
8
VS
Toggle input
Supply voltage
U6032B
4771A–AUTO–11/03
U6032B
Functional Description
Power Supply, Pin 8
To achieve interference protection and surge immunity, the supply voltage (pin 8) must
be provided with an RC circuit as shown in Figure 3. The dropping resistor, R1, limits the
current in case of overvoltage, whereas C1 smoothes the supply voltage at pin 8.
Recommended values are: R1 = 510 W, C1 = 47 µF.
An integrated Z-diode (14 V) protects the supply voltage, VS, thus enabling stable operation in a supply-voltage range of 6 V to 16 V, supplied by VBatt.
It is possible to operate the integrated circuit with a 5 V supply, but it should be assured
that there are no interference voltages. In this case, pin 7 is connected to pin 8 as shown
in Figure 4 on page 4, and the R1C1 circuit is omitted.
Figure 3. Basic Circuit for 12-V Supply and Oscillator
VBatt
510 Ω
R1
C2
C1
47 µF/
16 V
R2
8
7
6
5
U6032B
1
2
3
4
3
4771A–AUTO–11/03
Figure 4. Basic Circuit for VS = 5 V
VS = 5 V
C2
R2
8
6
7
5
VBatt
U6032B
1
Oscillator, Pin 6
2
3
4
The oscillator frequency, f, is determined mainly by the R2C2 circuit. The resistance, R2,
determines the charge time, and the integrated resistance (2 kW) is responsible for the
discharge time. To ensure the stability of the oscillator frequency, it is recommended
that the selected R2 value is remarkably greater than the internal resistance (2 kW), as
the temperature response and the tolerances of the integrated resistance are considerably greater than the external resistance value.
The oscillator frequency, f, is calculated as follows:
1
f = --------------t1 + t2
where
t1 = charge time = a1 ´ R2 ´ C2
t2 = discharge time = a2 ´ 2 kW ´ C2
a1 and a2 are constants, e.g.:
a1 = 0.833 and a2 = 1.551 when C2 = 470 pF to 10 nF
a1 = 0.746 and a2 = 1.284 when C2 = 10 nF to 4700 nF
The debounce time, t3, depends on the oscillator frequency, f, as follows:
1
t 3 = 6 ´ --t
Table 1 shows the relationship between t3, C2, R2 and frequencies from 1 Hz to 20 kHz.
4
U6032B
4771A–AUTO–11/03
U6032B
Relay-control Output
The relay-control output is an open-collector Darlington circuit with an integrated
23-V Z-diode for limiting the inductive cut-off pulse of the relay coil. The maximum static
collector current must not exceed 300 mA and the saturation voltage is typically 1.1 V at
200 mA.
Interference Voltages
and Load Dump
The lC supply is protected by R1, C1, and an integrated Z-diode, while the inputs are
protected by a series resistor, integrated Z-diode and RF capacitor (refer to Figure 6 on
page 6).
The relay-control output is protected by the integrated 23 V Z-diode in case of short
interference peaks. It is switched to conductive condition for a battery voltage greater
than 40 V in case of load dump. The output transistor is dimensioned so that it can withstand the generated current.
Power-on Reset
When the operating voltage is switched on, an internal power-on reset pulse (POR) is
generated which sets the logic of the circuits to a defined initial condition. The relay output is disabled.
Relay-control Output
Behavior, Pin 2
The time functions (relay output) can be started or interrupted by the three inputs ON,
OFF or TOGGLE (pins 3, 4 and 5, input circuit of these pins see Figure 6 on page 6).
The relay becomes active if the time function is triggered, and the relay contact is interrupted after the elapse of the delay time, td. There are two input possibilities.
Toggle Input, Pin 5
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.
Repeated operation of S1 causes the interruption of the relay contact, thus disabling the
relay. Each operation of the toggle switch, S1, changes (alters) the condition of the relay
output when the debounce time, td, is exceeded, i.e., the TOGGLE function.
If the relay output is not disabled by pressing the switch S1, the output stays active.
Figure 5. TOGGLE Function
VBatt
R1
510 Ω
S1
C2
C1
R2
47 µF/
16 V
8
7
20 kΩ
6
5
U6032B
1
2
3
4
5
4771A–AUTO–11/03
ON, OFF Inputs, Pins 3
and 4
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, t3, has ellapsed whereas the switching of pin 4 switch correspondingly
leads to the de-energization of the relay. If the relay is not de-energized by the push-button 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 S1
is ON or OFF.
Figure 6 shows the input circuit of U6032B. It has an integrated pull-down resistor
(20 kW), 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 kW and the push-button switch, S, is
connected to the battery as shown in the diagram.
The contact current, I, is calculated as follows:
V Batt – VZ
I = ----------------------------- where VBatt = 12 V, VZ = 7 V
R(= 20 k W )
(12 - 7) V
I = ------------------------- » 0.25 mA
20 k W
It can be increased by connecting a 5.6 kW resistor from the push-button switch to
ground as shown in Figure 8 on page 7.
Figure 6. Input Circuit
2V
VBatt
S
Pin 3, 4, 5
R
+
20 kΩ
20 kΩ
7V
15 pF
Figure 7. ON/OFF Function
VBatt
S3
R1
510 Ω
C1
C2
R2
47 µF/
16 V 8
7
20 kΩ
6
20 kΩ
5
U6032B
1
6
2
3
4
U6032B
4771A–AUTO–11/03
U6032B
Figure 8. Increasing the Contact Current by Parallel Resistors
VBatt
2 mA
5.6 kΩ
8
7
6
5.6 kΩ
5
20 kΩ
20 kΩ
U 6032 B
1
2
3
4
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Symbol
Value
Unit
Operating voltage, static, 5 minutes
VBatt
24
V
Ambient temperature range
Tamb
-40 to +125
°C
Storage temperature range
Tstg
-55 to +125
°C
Tj
150
°C
Junction temperature
Thermal Resistance
Parameters
Junction ambient
Symbol
Value
Unit
DIP8
TthJA
110
K/W
SO8
TthJA
160
K/W
7
4771A–AUTO–11/03
Electrical Characteristics
VBatt = 13.5 V, Tamb = 25°C, reference point ground, Figure 1 on page 1, unless otherwise specified
Parameters
Test Conditions
Pin
Symbol
Min.
Operating voltage
R1 ³ 510 W
t < 5 min
t < 60 min
5 V supply
Without R1, C1
Stabilized voltage
VBatt = 12 V
Undervoltage threshold
Power-on reset
Supply current
All push buttons open
8
IS
Internal Z-diode
I8 = 10 mA
8
VZ
VBatt
6
16
24
18
7, 8
V8, V7
4.3
6.0
V
7
V7
5.0
5.4
V
VS
3.0
13.5
Typ.
5.2
Max.
Unit
V
4.2
V
1.3
2.0
mA
14
16
V
2
Relay Control Output
Saturation voltage
I2 = 200 mA
I2 = 300 mA
V2
Leakage current
V2 = 14 V
Ilkg
Output current
1.2
1.5
2
V
100
µA
I2
300
mA
1.5
A
Output Pulse Current
Load-dump pulse
t £ 300 ms
I2
Internal Z-diode
I2 = 10 mA
VZ
20
22
24
V
Oscillator Input
f = 0.001 to 40 kHz, see Table 1
Internal discharge resistance
V6 = 5 V
R6
1.6
2.0
2.4
kW
Switching thresholds
Lower
Upper
V6L
V6H
0.9
2.8
1.1
3.1
1.4
3.5
V
Input current
V6 = 0 V
-I6
1
µA
7
Cycles
6
Switching Times
Debounce time
t3
5
3, 4, 5
Inputs ON, OFF, TOGGLE
Switching threshold voltage
V3,4,5
1.6
2.0
2.4
V
Internal Z-diode
I3,4,5 = 10 mA
V3,4,5
6.5
7.1
8.0
V
Pull-down resistance
V3,4,5 = 5 V
R3,4,5
13
20
50
kW
Table 1. Values for C2 and R2 for a Given Oscillator Frequency and Debounce Time
8
Frequency f (Hz)
Debounce Time t3 (ms)
C2 (nF)
R2 (kW)
1
6000
4700
280
2
3000
1000
650
3
2000
1000
440
4
1500
1000
330
5
1200
1000
260
6
1000
1000
220
7
857
1000
190
8
750
1000
160
U6032B
4771A–AUTO–11/03
U6032B
Table 1. Values for C2 and R2 for a Given Oscillator Frequency and Debounce Time (Continued)
Frequency f (Hz)
Debounce Time t3 (ms)
C2 (nF)
R2 (kW)
9
667
1000
140
10
600
1000
130
20
300
100
650
30
200
100
440
40
150
100
330
50
120
100
260
60
100
100
220
70
86
100
190
80
75
100
160
90
67
100
140
100
60
100
130
200
30
10
600
300
20
10
400
400
15
10
300
500
12
10
240
600
10
10
200
700
9.00
10
170
800
8.00
10
150
900
7.00
10
130
1000
6.00
10
120
2000
3.00
1
600
3000
2.00
1
400
4000
1.50
1
300
5000
1.20
1
240
6000
1.00
1
200
7000
0.86
1
170
8000
0.75
1
150
9000
0.67
1
130
10000
0.60
1
120
11000
0.55
1
110
12000
0.50
1
99
13000
0.46
1
91
14000
0.43
1
85
15000
0.40
1
79
16000
0.38
1
74
17000
0.35
1
70
18000
0.33
1
66
19000
0.32
1
62
20000
0.30
1
59
9
4771A–AUTO–11/03
Ordering Information
Extended Type Number
Package
Remarks
U6032B
DIP8
–
U6032B-FP
SO8
–
Package Information
Package DIP8
Dimensions in mm
7.77
7.47
9.8
9.5
1.64
1.44
4.8 max
6.4 max
0.5 min 3.3
0.58
0.48
2.54
0.36 max
9.8
8.2
7.62
8
5
technical drawings
according to DIN
specifications
1
10
4
U6032B
4771A–AUTO–11/03
U6032B
Package SO8
Dimensions in mm
5.2
4.8
5.00
4.85
3.7
1.4
0.25
0.10
0.4
1.27
6.15
5.85
3.81
8
0.2
3.8
5
technical drawings
according to DIN
specifications
1
4
11
4771A–AUTO–11/03
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4771A–AUTO–11/03