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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
47 F Vstab VS
Rear Window Heating Timer/ Long-term Timer U6046B
C2 OSC 6
R2
C1
R1
7
8
510
VBatt
Oscillator
Stabilization Power-on reset Load-dump detection
1 GND
Frequency divider 3 ON 4 OFF 5 TOGGLE Debouncing Mono-flop Relay control output 2 OUT
Rev. 4674B-AUTO-09/05
2. Pin Configuration
Figure 2-1. Pinning
GND 1 8 VS
OUT
2
7
VSTAB
ON
3
6
OSC
OFF
4
5
TOGGLE
Table 2-1.
Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol GND OUT ON OFF TOGGLE OSC VSTAB VS Function Reference point, ground Relay control output Switch-on input Switch-off input Toggle input RC-oscillator input Stabilized voltage Supply voltage
2
U6046B
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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 = 510, C1 = 47 F. 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 C1
R1
510 R2
C2
47 F/ 16 V 8
7
6
5
U6046B
1
2
3
4
3
4674B-AUTO-09/05
Figure 3-2.
Basic Circuit for VS = 5V
C2
VS = 5 V
R2
VBatt
8
7
6
5
U6046B
1
2
3
4
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-k resistor. A stable oscillator frequency with minimal influence of the temperature coefficient of the integrated resistor is achieved with R2 >> 2 k. Oscillator frequency, f, is calculated as follows:
1 f = -------------t1 + t2
where t1 = charge time = 1 x R2 x C2 t2 = discharge time = 2 x 2 k x C2 1 and 2 are constants as such 1 = 0.833 and 2 = 1.551 when C2 = 470 pF to 10 nF 1 = 0.746 and 2 = 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 x -f 1 t d = 73728 x -f
Table 6-1 on page 10 shows relationships between t3, td, C2, R2 and frequencies from 1 Hz to 20 kHz.
4
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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 R1 C1 47 F/ 16 V 8 510 C2 R2 S1
20 k
7
6
5
U6046B
1
2
3
4
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 k), RF capacitor (15 pF) and Z-diode (7V). It reacts to voltages greater than 2V. The external protective resistor has a value of 20 k 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)
( 12 - 7 )V I = ------------------------ 0.25 mA 20 k
6
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U6046B
It can be increased by connecting a 5.6 k resistor from the push-button switch to ground as shown in Figure 7-4 on page 13. Figure 3-4. ON/OFF Function
VBatt R1 C1 47 F/ 16 V 8 510 R2 C2 20 k
S3
20 k
7
6
5
U6046B
1
2
3
4
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 Toggle Relay Pin 5
t3 t3
Diagram 5B
Pin 2
t3
t3
t3
t3 td
Pin 3
ON OFF
t 3 t 3
Pin 4
Relay
Pin 2
t3
Diagram 5C
t3
t3
t3 t3
t3 td
Pin 3
ON OFF Relay Pin 4 Pin 2
td t3
Figure 3-6.
Input Circuit U6046B
2V VBatt S R 20 k 7V 15 pF 20 k Pin 3, 4, 5 +
8
U6046B
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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
Operating voltage, static, 5 min Ambient temperature range Storage temperature range Junction temperature
Symbol
VBatt Tamb Tstg Tj
Value
24 -40 to +125 -55 to +125 150
Unit
V C C C
5. Thermal Resistance
Parameters
Junction ambient DIP8 SO8
Symbol
RthJA RthJA
Value
120 160
Unit
K/W K/W
6. Electrical Characteristics
VBatt =13.5V, Tamb = 25C, reference point ground, Figure 2-1 on page 2, unless otherwise specified
No.
1.1
Parameters
Operating voltage
Test Conditions
R1 510 t < 5 min t < 60 min Without R1, C1, Figure 3-2 on page 4 VBatt = 12V Power on reset All push buttons open I8 = 10 mA I2 = 200 mA I2 = 300 mA V2 = 14V
Pin
Symbol
VBatt
Min.
6
Typ.
Max.
16 24 18 6.0
Unit
V V V V mA V
1.2 1.3 1.4 1.5 1.6
5V supply Stabilized voltage Undervoltage threshold Supply current Internal Z-diode
7, 8 7 8 8
V8, V7 V7 V8 I8 V8
4.3 5.0 3.0 1.3 13.5 14 5.2
5.4 4.2 2.0 16
2
2.1 2.2 2.3
Relay Control Output, Pin 2
Saturation voltage Leakage current Output current V2 I2 I2 t 300 ms I2 = 10 mA I2 V2 20 22 1.2 2 1.5 100 300 1.5 24 V A mA A V
3
3.1 3.2
Output Pulse Current
Load dump pulse Internal Z-diode Internal discharge resistance Switching voltage Input current
4
4.1 4.2 4.3
Oscillator Input f = 0.001 to 40 kHz, See Table 6-1 on page 10, Pin 6
V6 = 5V Lower Upper V6 = 0V R6 V6L V6H -I6 1.6 0.9 2.8 2.0 1.1 3.1 2.4 1.4 3.5 1 k V A
9
4674B-AUTO-09/05
6. Electrical Characteristics (Continued)
VBatt =13.5V, Tamb = 25C, reference point ground, Figure 2-1 on page 2, unless otherwise specified
No. 5
5.1 5.2
Parameters Switching Time
Debounce time Delay time
Test Conditions
Pin
Symbol
t3 td V3,4,5
Min.
5 72704 1.6 6.5 13
Typ.
Max.
7 74752
Unit
cycles cycles V V k
6
6.1 6.2 6.3
Inputs ON, OFF, TOGGLE; Pins 3, 4, 5
Switching threshold voltage Internal Z-diode Pull-down resistance I3, 4, 5 = 10 mA V3,4,5 = 5V 2.0 7.1 20 2.4 8.0 50
V3,4,5 R3,4,5
Table 6-1.
Hz
Dimensioning for Oscillator Frequency, Debounce Time and Delay Time
Debounce Time t3
ms min
Frequency f
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100 200 300 400 500 600 700 800 900 1000
Delay Time td
s
C2
nF
R2
k
6000 3000 2000 1500 1200 1000 857 750 667 600 300 200 150 120 100 86 75 67 60 30 20 15 12 10 9.00 8.00 7.00 6.00
1229 614 410 307 246 205 176 154 137 123 61 41 31 25 20 18 15 14 12 369 246 184 147 123 105 92 82 74
4700 1000 1000 1000 1000 1000 1000 1000 1000 1000 100 100 100 100 100 100 100 100 100 10 10 10 10 10 10 10 10 10
280 650 440 330 260 220 190 160 140 130 650 440 330 260 220 190 160 140 130 600 400 300 240 200 170 150 130 120
10
U6046B
4674B-AUTO-09/05
U6046B
Table 6-1.
Hz
Dimensioning for Oscillator Frequency, Debounce Time and Delay Time (Continued)
Debounce Time t3
ms min
Frequency f
2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000
Delay Time td
s
C2
nF
R2
k
3.00 2.00 1.50 1.20 1.00 0.86 0.75 0.67 0.60 0.55 0.50 0.46 0.43 0.40 0.38 0.35 0.33 0.32 0.30
37 25 18 15 12 11 9 8 7 6.7 6.1 5.7 5.3 4.9 4.6 4.3 4.1 3.9 3.7
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
600 400 300 240 200 170 150 130 120 110 99 91 85 79 74 70 66 62 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 R1 C1 47 F/ 16 V 510 R2
C2
8
7
6
5
U6046B
1
2
3
4
Figure 7-2.
Generation of a Monostable Delay Time, td, by Applying the Operating Voltage VBatt, Deactivatable by the OFF Push-button
VBatt R1 C1 47 F/ 16 V 510 R2 C2 20 k
8
7
6
5
U6046B
1
2
3 4.7 F
4
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 R1 C1 47 F/ 16 V 510 R2 C2
8
7
6
5
U6046B
1
2
3
4
Figure 7-4.
Increasing the Contact Current by Parallel Resistors
VBatt 2 mA 5.6 k 5.6 k
8
7
6
5
20 k
20 k
U6046B
1
2
3
4
13
4674B-AUTO-09/05
8. Ordering Information
Extended Type Number
U6046B-MY U6046B-MFPY U6046B-MFPG3Y
Package
DIP8 SO8 SO8
Remarks
Pb-free Tubed, Pb-free 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
9 .8 9 .5 1 .6 4 1 .4 4 7 .7 7 7 .4 7
4 .8 m a x 6 .4 m a x 0 .5 m in 0 .5 8 0 .4 8 7 .6 2 8 5 2 .5 4 3 .3 0 .3 6 m a x 9 .8 8 .2
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
4
14
U6046B
4674B-AUTO-09/05
U6046B
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7
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 * * * *
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
4674B-AUTO-09/05
15
4674B-AUTO-09/05
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4674B-AUTO-09/05

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