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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)
Automotive Toggle Switch IC U6032B
1. Description
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.
Figure 1-1.
Block Diagram with External Circuit
C2 R2 Vstab 7 47 F C1
R1
OSC
6
VS 8
510
VBatt
Oscillator
Stabilization Power-on reset Load-dump detection
1 GND
Frequency divider 3 ON 4 OFF 5 TOGGLE Debouncing Relay-control output 2
Rev. 4771B-AUTO-11/05
2. Pin Configuration
Figure 2-1. Pinning DIP8/SO8
GND
1
8
VS
RELAY
2
7
VSTAB
ON
3
6
OSC
OFF
4
5
TOGGLE
3. Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol GND RELAY 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
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U6032B
4. Functional Description
4.1 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 4-1. 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 , C1 = 47 F. 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 4-2 on page 4, and the R1C1 circuit is omitted.
Figure 4-1.
Basic Circuit for 12-V Supply and Oscillator
VBatt C1
R1
510 R2
C2
47 F/ 16 V
8
7
6
5
U6032B
1
2
3
4
3
4771B-AUTO-11/05
Figure 4-2.
Basic Circuit for VS = 5 V
VS = 5 V
R2
C2
8 VBatt
7
6
5
U6032B
1
2
3
4
4.2
Oscillator, Pin 6
The oscillator frequency, f, is determined mainly by the R2C2 circuit. The resistance, R2, determines the charge time, and the integrated resistance (2 k) 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 k), 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:
1f = -------------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, e.g.: 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, depends on the oscillator frequency, f, as follows:
1 t 3 = 6 x -t
Table 7-1 on page 8 shows the relationship between t3, C2, R2 and frequencies from 1 Hz to 20 kHz.
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U6032B
4.3 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.
4.4
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 (refer to Figure 4-4 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.
4.5
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.
4.6
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 4-4 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.
4.7
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 4-3. TOGGLE Function
VBatt R1 C1 47 F/ 16 V 8 510 C2 R2 S1 20 k 6 5
7
U6032B
1
2
3
4
5
4771B-AUTO-11/05
4.8
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 4-4 shows the input circuit of U6032B. It has an integrated pull-down resistor (20 k), 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 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:
V Batt - V Z I = ----------------------------- where VBatt = 12 V, VZ = 7 V R(= 20 k) (12 - 7) V I = ------------------------ 0.25 mA 20 k
It can be increased by connecting a 5.6 k resistor from the push-button switch to ground as shown in Figure 4-6 on page 7. Figure 4-4. Input Circuit
2V VBatt S R 20 k 7V 15 pF 20 k Pin 3, 4, 5 +
Figure 4-5.
ON/OFF Function
VBatt S3 R1 C1 47 F/ 16 V 8 510 R2 C2 20 k 20 k
7
6
5
U6032B
1
2
3
4
6
U6032B
4771B-AUTO-11/05
U6032B
Figure 4-6. Increasing the Contact Current by Parallel Resistors
VBatt 2 mA 5.6 k 5.6 k
8
7
6
5 20 k 20 k
U 6032 B
1
2
3
4
5. 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 minutes 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
6. Thermal Resistance
Parameters Junction ambient DIP8 SO8 Symbol TthJA TthJA Value 110 160 Unit K/W K/W
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4771B-AUTO-11/05
7. Electrical Characteristics
VBatt = 13.5 V, Tamb = 25 C, reference point ground, Figure 1-1 on page 1, unless otherwise specified
Parameters Operating voltage 5 V supply Stabilized voltage Undervoltage threshold Supply current Internal Z-diode Relay Control Output Saturation voltage Leakage current Output current Output Pulse Current Load-dump pulse Internal Z-diode Oscillator Input Internal discharge resistance Switching thresholds Input current Switching Times Debounce time Inputs ON, OFF, TOGGLE Switching threshold voltage Internal Z-diode Pull-down resistance I3,4,5 = 10 mA V3,4,5 = 5 V 3, 4, 5 V3,4,5 V3,4,5 R3,4,5 1.6 6.5 13 2.0 7.1 20 2.4 8.0 50 V V k t3 5 7 Cycles t 300 ms I2 = 10 mA f = 0.001 to 40 kHz, see Table 7-1 V6 = 5 V Lower Upper V6 = 0 V 6 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 I2 VZ 20 22 1.5 24 A V I2 = 200 mA I2 = 300 mA V2 = 14 V Test Conditions R1 510 t < 5 min t < 60 min Without R1, C1 VBatt = 12 V Power-on reset All push buttons open I8 = 10 mA 8 8 2 V2 Ilkg I2 1.2 1.5 2 100 300 V A mA 7, 8 7 Pin Symbol VBatt V8, V7 V7 VS IS VZ 13.5 Min. 6 4.3 5.0 3.0 1.3 14 5.2 Typ. Max. 16 24 18 6.0 5.4 4.2 2.0 16 Unit
V V V V mA V
Table 7-1.
Values for C2 and R2 for a Given Oscillator Frequency and Debounce Time
Frequency f (Hz) 1 2 3 4 5 6 7 8 9 Debounce Time t3 (ms) 6000 3000 2000 1500 1200 1000 857 750 667 C2 (nF) 4700 1000 1000 1000 1000 1000 1000 1000 1000 R2 (k) 280 650 440 330 260 220 190 160 140
8
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U6032B
Table 7-1. Values for C2 and R2 for a Given Oscillator Frequency and Debounce Time (Continued)
Frequency f (Hz) 10 20 30 40 50 60 70 80 90 100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000 Debounce Time t3 (ms) 600 300 200 150 120 100 86 75 67 60 30 20 15 12 10 9.00 8.00 7.00 6.00 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 C2 (nF) 1000 100 100 100 100 100 100 100 100 100 10 10 10 10 10 10 10 10 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 R2 (k) 130 650 440 330 260 220 190 160 140 130 600 400 300 240 200 170 150 130 120 600 400 300 240 200 170 150 130 120 110 99 91 85 79 74 70 66 62 59
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4771B-AUTO-11/05
8. Ordering Information
Extended Type Number U6032B-MY U6032B-MFPY U6032B-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
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10
5.2 4.8 3.7
0.2 3.8 6.15 5.85
technical drawings according to DIN specifications
1
4
10
U6032B
4771B-AUTO-11/05
U6032B
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. 4771B-AUTO-11/05 History * Put datasheet in a new template * First page: Pb-free logo added * Page 10: Ordering Information changed
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4771B-AUTO-11/05
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