ATMEL U6046B-MFPY

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
Rear Window
Heating Timer/
Long-term
Timer
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.
U6046B
The delay time can be interrupted manually, but a retrigger function is not provided.
Figure 1-1.
Block Diagram with External Circuit
C2
47 µF
R2
OSC 6
Oscillator
Vstab
7
VS
C1
8
Stabilization
Power-on reset
Load-dump detection
R1
510 Ω
VBatt
1
GND
Frequency divider
3
ON
4
OFF
Debouncing
Mono-flop
Relay control
output
2
OUT
5
TOGGLE
Rev. 4674B–AUTO–09/05
2. Pin Configuration
Figure 2-1.
Table 2-1.
2
Pinning
GND
1
8
VS
OUT
2
7
VSTAB
ON
3
6
OSC
OFF
4
5
TOGGLE
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
6
OSC
7
VSTAB
8
VS
Toggle input
RC-oscillator input
Stabilized voltage
Supply voltage
U6046B
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
VBatt
510 Ω
R1
C2
C1
R2
47 µF/
16 V 8
7
6
5
U6046B
1
2
3
4
3
4674B–AUTO–09/05
Figure 3-2.
Basic Circuit for VS = 5V
VBatt
C2
R2
VS = 5 V
8
6
7
5
U6046B
1
3.2
2
3
4
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 integrated resistor is achieved with R2 >> 2 kΩ.
Oscillator frequency, f, is calculated as follows:
1
f = --------------t1 + t2
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:
1
t 3 = 6 × --f
1
t d = 73728 × --f
Table 6-1 on page 10 shows relationships between t3, td, C2, R2 and frequencies from 1 Hz to 20
kHz.
4
U6046B
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 interference 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
V Batt
510 Ω
R1
S1
C2
C1
R2
47 µF/
16 V 8
7
20 kΩ
6
5
3
4
U6046B
1
2
5
4674B–AUTO–09/05
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 contacts 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 disabled 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 interrupted. 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 resistance (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:
V Batt – V Z
I = ----------------------------- where VBatt =12V, VZ =7V
R ( = 20 k Ω)
( 12 – 7 ) V
I = ------------------------- ≈ 0.25 mA
20 k Ω
6
U6046B
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
S3
VBatt
R1
510 Ω
C1
C2
R2
47 µF/
16 V 8
7
20 kΩ
6
5
3
4
20 kΩ
U6046B
1
2
7
4674B–AUTO–09/05
3.7
Timing Waveform
Figure 3-5.
Behavior of the Relay Control Output as a Function of Input Condition
Diagram 5A
Pin 5
Toggle
Relay
t3
Pin 2
t3
t3
t3
t3
t3
td
Diagram 5B
ON
OFF
Pin 3
t3
Pin 4
t3
Pin 2
Relay
t3
t3
t3
t3
t3
t3
td
Diagram 5C
Pin 3
ON
Pin 4
OFF
Relay
Pin 2
td
t3
Figure 3-6.
Input Circuit U6046B
2V
VBatt
S
R
Pin 3, 4, 5
+
20 kΩ
20 kΩ
7V
15 pF
8
U6046B
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
VBatt
24
V
Ambient temperature range
Tamb
–40 to +125
°C
Storage temperature range
Tstg
–55 to +125
°C
Tj
150
°C
Symbol
Value
Unit
RthJA
RthJA
120
160
K/W
K/W
Junction temperature
5. Thermal Resistance
Parameters
Junction ambient DIP8
SO8
6. Electrical Characteristics
VBatt =13.5V, Tamb = 25°C, reference point ground, Figure 2-1 on page 2, unless otherwise specified
No.
Parameters
Test Conditions
1.1
Operating voltage
R1 ≥ 510Ω
t < 5 min
t < 60 min
1.2
5V supply
Without R1, C1,
Figure 3-2 on page 4
1.3
Stabilized voltage
VBatt = 12V
1.4
Undervoltage threshold
Power on reset
1.5
Supply current
All push buttons open
8
I8
1.6
Internal Z-diode
I8 = 10 mA
8
V8
2
Pin
Symbol
Min.
Typ.
Unit
VBatt
6
16
24
18
7, 8
V8, V7
4.3
6.0
V
7
V7
5.0
5.4
V
V8
3.0
4.2
V
1.3
2.0
mA
14
16
V
13.5
5.2
V
Relay Control Output, Pin 2
2.1
Saturation voltage
I2 = 200 mA
I2 = 300 mA
V2
1.2
2.2
Leakage current
V2 = 14V
I2
2
2.3
Output current
3
Max.
I2
1.5
V
100
µA
300
mA
Output Pulse Current
3.1
Load dump pulse
t ≤ 300 ms
I2
1.5
A
3.2
Internal Z-diode
I2 = 10 mA
V2
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
V6 = 5V
R6
1.6
2.0
2.4
kΩ
4.2
Switching voltage
Lower
Upper
V6L
V6H
0.9
2.8
1.1
3.1
1.4
3.5
V
4.3
Input current
V6 = 0V
-I6
1
µA
9
4674B–AUTO–09/05
6. Electrical Characteristics (Continued)
VBatt =13.5V, Tamb = 25°C, reference point ground, Figure 2-1 on page 2, unless otherwise specified
No.
Parameters
5
Pin
Symbol
Min.
Typ.
Max.
Unit
Switching Time
5.1
Debounce time
5.2
t3
5
7
cycles
td
72704
74752
cycles
V3,4,5
1.6
2.0
2.4
V
Delay time
6
Inputs ON, OFF, TOGGLE; Pins 3, 4, 5
6.1
Switching threshold voltage
6.2
Internal Z-diode
I3, 4, 5 = 10 mA
V3,4,5
6.5
7.1
8.0
V
6.3
Pull-down resistance
V3,4,5 = 5V
R3,4,5
13
20
50
kΩ
Table 6-1.
10
Test Conditions
Dimensioning for Oscillator Frequency, Debounce Time and Delay Time
Frequency f
Debounce Time t3
Delay Time td
C2
R2
Hz
ms
min
nF
kΩ
1
6000
2
3000
1229
4700
280
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
s
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
U6046B
4674B–AUTO–09/05
U6046B
Table 6-1.
Dimensioning for Oscillator Frequency, Debounce Time and Delay Time (Continued)
Frequency f
Debounce Time t3
Delay Time td
min
C2
R2
Hz
ms
s
nF
kΩ
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
11
4674B–AUTO–09/05
7. Applications
Figure 7-1.
Generation of a Monostable Delay Time, td, Caused by Applying the Operating
Voltage VBatt, not Externally Deactivatable
VBatt
510 Ω
R1
C2
R2
C1
47 µF/
16 V
7
8
6
5
3
4
U6046B
1
Figure 7-2.
2
Generation of a Monostable Delay Time, td, by Applying the Operating Voltage
VBatt, Deactivatable by the OFF Push-button
VBatt
510 Ω
R1
47 µF/
16 V
C2
R2
C1
20 kΩ
8
7
6
5
3
4
U6046B
1
2
4.7 µF
12
U6046B
4674B–AUTO–09/05
U6046B
Figure 7-3.
Monostable Delay Time, td, can be Activated by the ON Push-button, not Externally Deactivatable
VBatt
510 Ω
R1
C2
C1
47 µF/
16 V
R2
7
8
6
5
3
4
U6046B
1
Figure 7-4.
2
Increasing the Contact Current by Parallel Resistors
VBatt
2 mA
5.6 kΩ
8
7
6
5.6 kΩ
5
20 kΩ
20 kΩ
U6046B
1
2
3
4
13
4674B–AUTO–09/05
8. Ordering Information
Extended Type Number
Package
U6046B-MY
Remarks
DIP8
Pb-free
U6046B-MFPY
SO8
Tubed, Pb-free
U6046B-MFPG3Y
SO8
Taped and reeled, Pb-free
9. Package Information
P a c k a g e D IP 8
D im e n s io n s in m m
7 .7 7
7 .4 7
9 .8
9 .5
1 .6 4
1 .4 4
4 .8 m a x
6 .4 m a x
0 .5 m in
0 .5 8
0 .4 8
3 .3
0 .3 6 m a x
9 .8
8 .2
2 .5 4
7 .6 2
8
5
te c h n ic a l d ra w in g s
a c c o rd in g to D IN
s p e c ific a tio n s
1
14
4
U6046B
4674B–AUTO–09/05
U6046B
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
10. Revision History
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
15
4674B–AUTO–09/05
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4674B–AUTO–09/05