Features
•
Delay Time Range: 3.7s to 20h
•
RC Oscillator Determines Timing Characteristics
•
Relay Driver with Z-diode
•
Debounced Input for Toggle Switch
•
Two Debounced Inputs: ON and OFF
•
Load-dump Protection
•
RF Interference Protected
•
Protection According to ISO/TR7637-1 (VDE 0839)
•
Inputs Switched to VBatt
1. Description
The bi-polar long-term timer U6046B is designed to automatically limit the operation
time of high loads in the harsh automotive environment with a preset delay time. With
the power-on-reset function the timers guarantee that current consuming devices are
not operated unintentionally.
The delay time can be interrupted manually, but a retrigger function is not provided.
Figure 1-1. Block Diagram with External Circuit
Stabilization
Power-on reset
Load-dump detection
Debouncing Mono-flop Relay control
output
Oscillator
Frequency divider
ON
OFF
T
OGGLE
GND
OSC V
S
V
stab
678
3
4
5
1
2
C
2
510 Ω
47 µF
V
Batt
OUT
R
2
C
1
R
1
Rear Window
Heating Timer/
Long-term
Timer
U6046B
Rev. 4674B–AUTO–09/05
2
4674B–AUTO–09/05
U6046B
2. Pin Configuration
Figure 2-1. Pinning
1
2
3
4
8
7
6
5
GND
OUT
ON
OFF TOGGLE
OSC
VSTAB
VS
Table 2-1. Pin Description
Pin Symbol Function
1 GND Reference point, ground
2 OUT Relay control output
3 ON Switch-on input
4 OFF Switch-off input
5 TOGGLE Toggle input
6 OSC RC-oscillator input
7 VSTAB Stabilized voltage
8 VS Supply voltage
3
4674B–AUTO–09/05
U6046B
3. Functional Description
3.1 Power Supply (Pin 8)
For reasons of interference protection and surge immunity, the supply voltage (pin 8) must be
provided with an RC circuit as shown in Figure 3-1. Dropper resistor, R1, limits the current in
case of overvoltage, whereas C1 smooths the supply voltage at pin 8.
Recommended values are: R1 = 510Ω, C1 = 47 µF.
The integrated Z-diode (14V) protects the supply voltage, VS. Therefore, the operation of the IC
is possible between 6V and 16V, supplied by VBatt.
However, it is possible to operate the integrated circuit with a 5V supply, but it should be free of
interference voltages. In this case, pin 7 is connected to pin 8 as shown in Figure 3-2 on page 4,
and the R1C1 circuit is omitted.
Figure 3-1. Basic Circuit for 12V Supply and Oscillator
47 µF/
16 V
510 Ω
V
Batt
12
65
87
34
U6046B
R
1
C
1
C
2
R
2
4
4674B–AUTO–09/05
U6046B
Figure 3-2. Basic Circuit for VS = 5V
3.2 Oscillator (Pin 6)
The external components R2 and C2 determine the oscillator frequency. The capacitor C2 is
charged by R2 and discharged by an integrated 2-kΩ resistor.
A stable oscillator frequency with minimal influence of the temperature coefficient of the inte-
grated resistor is achieved with R2 >> 2 kΩ.
Oscillator frequency, f, is calculated as follows:
where
t1 = charge time = α1 × R2 × C2
t2 = discharge time = α2 × 2 kΩ × C2
α1 and α2 are constants as such
α1 = 0.833 and α2 = 1.551 when C2 = 470 pF to 10 nF
α1 = 0.746 and α2 = 1.284 when C2 = 10 nF to 4700 nF
The debounce time, t3, and the delay time, td, depend on the oscillator frequency, f, as follows:
Table 6-1 on page 10 shows relationships between t3, td, C2, R2 and frequencies from 1 Hz to 20
kHz.
R2
12
65
87
34
VS = 5 V
U6046B
C2
VBatt
f1
t
1
t
2
+
---------------=
t
3
61
f
---
×=
t
d
73728 1
f
---
×=
5
4674B–AUTO–09/05
U6046B
3.3 Relay Control Output (OUT)
The relay control output is an open-collector Darlington circuit with an integrated 23-V Z-diode to
limit the inductive cut-off pulse of the relay coil. The maximum static collector current must not
exceed 300 mA and saturation voltage is typically 1.1V at 200 mA.
3.4 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 (see Figure 3-6 on page 8).
The relay control output is protected via the integrated 23-V Z-diode in the case of short interfer-
ence peaks. It is switched to a conductive condition for a battery voltage of greater than
approximate 40V in the case of a load-dump. The output transistor is dimensioned so that it can
withstand the current produced.
3.5 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.
Figure 3-3. TOGGLE Function
47 µF/
16 V
C1
510 Ω
R2
C2
VBatt
12
65
87
34
20 kΩ
S1
U6046B
R1
6
4674B–AUTO–09/05
U6046B
3.6 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, td. There are two input possibilities:
3.6.1 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 3-3 on page
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, td, is over.
3.6.2 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 con-
tacts with a centre-off position with spring returns (also known as rocker-actuated switch) is
recommended (see Figure 3-4 on page 7).
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 dis-
abled after the delay time, td, 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, td, still elapses and the relay is inter-
rupted. This can be used to generate a defined power-on-reset pulse to trigger, for example, a
delay time, td, when the battery voltage, VBatt, is applied.
Figure 3-6 on page 8 shows the input circuit of U6046B. It has an integrated pull-down resis-
tance (20 kΩ), RF capacitor (15 pF) and Z-diode (7V). It reacts to voltages greater than 2V. The
external protective resistor has a value of 20 kΩ and the push-button switch, S, is connected to
the battery as shown in the diagram.
Contact current, I, is calculated as follows:
where VBatt =12V, VZ =7V
IV
Batt
V
Z
–
R= 20 k
Ω()
------------------------------=
I12 7
–()
V
20 k
Ω
-------------------------
0.25 mA
≈=
7
4674B–AUTO–09/05
U6046B
It can be increased by connecting a 5.6 kΩ resistor from the push-button switch to ground as
shown in Figure 7-4 on page 13.
Figure 3-4. ON/OFF Function
47 µF/
16 V
C
1
R
1
510 Ω
R
2
C
2
V
Batt
12
65
87
34
20 kΩ20 kΩ
S3
U6046B
8
4674B–AUTO–09/05
U6046B
3.7 Timing Waveform
Figure 3-5. Behavior of the Relay Control Output as a Function of Input Condition
Figure 3-6. Input Circuit U6046B
Diagram 5A
Diagram 5B
Diagram 5C
Toggle
Relay
ON
OFF
Relay
ON
OFF
Relay
Pin 5
Pin 2
Pin 3
Pin 4
Pin 3
Pin 4
Pin 2
Pin 2
t
3
t
3
t
3
t
3
t
3
t
3
t
d
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
d
t
d
t
3
7 V 15 pF
20 kΩ
-
+
2 V
Pin 3, 4, 5
20 kΩ
V
Batt
SR
9
4674B–AUTO–09/05
U6046B
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 min V
Batt
24 V
Ambient temperature range T
amb
–40 to +125 °C
Storage temperature range T
stg
–55 to +125 °C
Junction temperature T
j
150 °C
5. Thermal Resistance
Parameters Symbol Value Unit
Junction ambient DIP8
SO8
R
thJA
R
thJA
120
160
K/W
K/W
6. Electrical Characteristics
V
Batt
=13.5V, T
amb
= 25°C, reference point ground, Figure 2-1 on page 2, unless otherwise specified
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
1.1 Operating voltage
R
1≥
510
Ω
t<5min
t<60min
V
Batt
6
16
24
18 V
1.2 5V supply Without R
1
, C
1
,
Figure 3-2 on page 4 7, 8 V
8
, V
7
4.3 6.0 V
1.3 Stabilized voltage V
Batt
= 12V 7 V
7
5.0 5.2 5.4 V
1.4 Undervoltage threshold Power on reset V
8
3.0 4.2 V
1.5 Supply current All push buttons open 8 I
8
1.3 2.0 mA
1.6 Internal Z-diode I
8
= 10 mA 8 V
8
13.5 14 16 V
2 Relay Control Output, Pin 2
2.1 Saturation voltage I
2
= 200 mA
I
2
= 300 mA V
2
1.2 1.5 V
2.2 Leakage current V
2
= 14V I
2
2100µA
2.3 Output current I
2
300 mA
3 Output Pulse Current
3.1 Load dump pulse t
≤
300 ms I
2
1.5 A
3.2 Internal Z-diode I
2
= 10 mA V
2
20 22 24 V
4 Oscillator Input f = 0.001 to 40 kHz, See Table 6-1 on page 10, Pin 6
4.1 Internal discharge
resistance V
6
= 5V R
6
1.6 2.0 2.4 k
Ω
4.2 Switching voltage Lower
Upper
V
6L
V
6H
0.9
2.8
1.1
3.1
1.4
3.5 V
4.3 Input current V
6
= 0V -I
6
1µA
10
4674B–AUTO–09/05
U6046B
5 Switching Time
5.1 Debounce time t
3
5 7 cycles
5.2 Delay time t
d
72704 74752 cycles
6 Inputs ON, OFF, TOGGLE; Pins 3, 4, 5
6.1 Switching threshold voltage V
3,4,5
1.6 2.0 2.4 V
6.2 Internal Z-diode I
3, 4, 5
= 10 mA
V3,4,5
6.5 7.1 8.0 V
6.3 Pull-down resistance V
3,4,5
= 5V
R3,4,5
13 20 50 k
Ω
6. Electrical Characteristics (Continued)
V
Batt
=13.5V, T
amb
= 25°C, reference point ground, Figure 2-1 on page 2, unless otherwise specified
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
Table 6-1. Dimensioning for Oscillator Frequency, Debounce Time and Delay Time
Frequency f Debounce Time t3Delay Time tdC2R2
Hz ms min s nF kΩ
1 6000 1229 4700 280
2 3000 614 1000 650
3 2000 410 1000 440
4 1500 307 1000 330
5 1200 246 1000 260
6 1000 205 1000 220
7 857 176 1000 190
8 750 154 1000 160
9 667 137 1000 140
10 600 123 1000 130
20 300 61 100 650
30 200 41 100 440
40 150 31 100 330
50 120 25 100 260
60 100 20 100 220
70 86 18 100 190
80 75 15 100 160
90 67 14 100 140
100 60 12 100 130
200 30 369 10 600
300 20 246 10 400
400 15 184 10 300
500 12 147 10 240
600 10 123 10 200
700 9.00 105 10 170
800 8.00 92 10 150
900 7.00 82 10 130
1000 6.00 74 10 120
11
4674B–AUTO–09/05
U6046B
2000 3.00 37 1 600
3000 2.00 25 1 400
4000 1.50 18 1 300
5000 1.20 15 1 240
6000 1.00 12 1 200
7000 0.86 11 1 170
8000 0.75 9 1 150
9000 0.67 8 1 130
10000 0.60 7 1 120
11000 0.55 6.7 1 110
12000 0.50 6.1 1 99
13000 0.46 5.7 1 91
14000 0.43 5.3 1 85
15000 0.40 4.9 1 79
16000 0.38 4.6 1 74
17000 0.35 4.3 1 70
18000 0.33 4.1 1 66
19000 0.32 3.9 1 62
20000 0.30 3.7 1 59
Table 6-1. Dimensioning for Oscillator Frequency, Debounce Time and Delay Time (Continued)
Frequency f Debounce Time t3Delay Time tdC2R2
Hz ms min s nF kΩ
12
4674B–AUTO–09/05
U6046B
7. Applications
Figure 7-1. Generation of a Monostable Delay Time, td, Caused by Applying the Operating
Voltage VBatt, not Externally Deactivatable
Figure 7-2. Generation of a Monostable Delay Time, td, by Applying the Operating Voltage
VBatt, Deactivatable by the OFF Push-button
47 µF/
16 V
C
1
R
1
510 Ω C
2
V
Batt
12
65
87
34
U6046B
R
2
8
47 µF/
16 V
C
1
R
1
510 ΩC
2
12
65
7
34
20 kΩ
4.7 µF
U6046B
V
Batt
R
2
13
4674B–AUTO–09/05
U6046B
Figure 7-3. Monostable Delay Time, td, can be Activated by the ON Push-button, not Exter-
nally Deactivatable
Figure 7-4. Increasing the Contact Current by Parallel Resistors
8
47 µF/
16 V
R
1
510 Ω
V
Batt
12
65
7
34
U6046B
R
2
C
2
C
1
12
65
87
34
20 kΩ
2 mA
V
Batt
20 kΩ
5.6 kΩ5.6 kΩ
U6046B
14
4674B–AUTO–09/05
U6046B
9. Package Information
8. Ordering Information
Extended Type Number Package Remarks
U6046B-MY DIP8 Pb-free
U6046B-MFPY SO8 Tubed, Pb-free
U6046B-MFPG3Y SO8 Taped and reeled, Pb-free
9.8
9.5
Package DIP8
Dimensions in mm
1.64
1.44
4.8 max
0.5 min 3.3
0.58
0.48
7.62
2.54
6.4 max
0.36 max
9.8
8.2
7.77
7.47
85
14
technical drawings
according to DIN
specifications
15
4674B–AUTO–09/05
U6046B
10. Revision History
technical drawings
according to DIN
specifications
Package SO8
Dimensions in mm
5.00
4.85
0.4
1.27
3.81
1.4
0.25
0.10
5.2
4.8
3.7
3.8
6.15
5.85
0.2
85
14
Please note that the following page numbers referred to in this section refer to the specific revision
mentioned, not to this document.
Revision No. History
4674B-AUTO-09/05
•
Put datasheet in a new template
•
Pb-free Logo on page 1 added
•
Heading Rows on Table “Absolute Maximum Ratings” on page 9 added
•
Table “Ordering Information” on page 14 changed
Printed on recycled paper.
4674B–AUTO–09/05
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