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U690B
Rear Wiper Interval/Wipe-Wash Control
Description
The bipolar integrated circuit, U690B, is designed with a time coded input for the rear pane wiper application. The length of the input signal determines the mode of operation i.e., intermittent or wipe/ wash; therefore, only one signal line is sufficient from the input switch to the electronic module.
Features
D D D D D D D
Time controlled interval/ wipe-wash Wiper arm's park position control Interval pause typ. 7 s Dry wiping time typ. 4.4 s Multipurpose frequency comparator Relay driver with Z-diode RC-oscillator determines switching characteristics
D Debounced main signal input D Power-on reset by low-voltage identification D Protection according to ISO / TR 7637-1 (VDE 0839) D Load-dump protection
Applications
Speed or R.P.M. detection
Ordering Information
Extended Type Number U690B Package DIP8 Remarks
Pin Configuration
Pin 1 2 3 4 5 6 7 8 Symbol GND Output Input Retrigger Program OSC Hyst Vstab Function Ground Relay control output Signal input Retrigger Program input RC-oscillator Hysteresis output Supply voltage 7.3 V GND Output 1 8 Vstab Hyst
2
7
Input Retrigger
3
6
OSC Program
4
94 9328
5
Figure 4. Pinning
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U690B
Block Diagram
C2 10 nF R2 47 mF C1 R1 1 kW Vstab 8 15 VBatt
OSC
6
360 kW Hyst 7
Oscillator
Stabilization Power-on-Reset Load-dump detection
1 GND 53
VBatt 15 Frequency comparator R4 180 kW 2 Debouncing Logic Relay output Relay output Wiper motor
L Water pump R6 1 kW
130 kW R3
Signal 3 input C5 1 nF
5
Program 4 input
Retrigger input
94 9297
R5 56 kW
Figure 1. Application circuit for rear wiper interval/wipe-wash control
Functional Description
Power Supply, Pin 8
47 mF/10 V 1 kW R1 R2 8 7 6 C2 5 15
For reasons of interference protection and surge immunity, the supply voltage (Pin 8) must be provided with an RC-circuit as shown in figure 2. Dropper resistor, R1, limits the current in case of overvoltage, whereas C1 smoothes the supply voltage at Pin 8. Recommended values are: R1 = 1 kW, C1 = 47 mF. An integratd Z-diode (7.3 V) generates the stabilized voltage, Vstab, therefore, the operation of the IC is possible between 6 V and 16 V, supplied by VBatt (Terminal 15).
C1
U690B
Relay
1
2
3
4
94 8868
Figure 2. Basic circuitry
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U690B
Interference Voltages and Load-Dump, Pins 3 and 4
Pin 3 (signal input) and Pin 4 (retrigger input) are protected against short interference peaks via the integrated Z-diodes and external series resistance. nected at terminal L and the wiper motor is connected at terminal 53, as shown in figure 1. Figure 4 shows three different modes of operation. The input signal pulse width, tp, (see figure 1, terminal L) determines the operation mode, with an assumed oscillator frequency of f = 400 Hz. Pin 5 and Pin 7 are open. As a debouncing measure, input pulses of tp less than 50 ms do not activate the relay. Further explanation is given with typical values. For detailed information, please refer to table 1. - Interval mode: 50 ms v tp v 610 ms Pin 2 (relay control output) is activated for 640 ms, where the interval pause, t3, is approximately 7 s. Wipe/wash mode: tp w 610 ms Dry wiping time is 4.4 s after the negative edge of tp. Wipe/wash mode with retrigger
Relay Control Output, Pin 2
The relay control output is an open collector Darlington circuit with an integrated 21-V Z-diode for limitation of the inductive cut-off pulse of the relay coil. The maximum static collector current must not exceed 200 mA and the saturation voltage is typically 1.0 V @ 100 mA, whereas the typical resistive load is 80 W.
+ 21 V Pin 2
-
-
94 8869
Figure 3. Relay control output
Retriggering for Large Park Segment
After dry wiping, the slip ring contact cuts off the supply of the wiper motor and stops the wiper in its parking position. However due to mechanical tolerances, the contact may pass over the park segment so that the wiper is switched off by the relay. The wiper arm then stops at an undefined position on the screen. By retriggering the U690B prevents the wiper arm from stopping anywhere other than its parking position. The voltage of the relay contact is fed back to the retrigger input which detects the negative switch off pulse (see figure 4) and reactivates the wiper motor immediately for approximately 640 ms. After another turn, the wiper is switched off correctly via the slip ring contact. The interval mode can be activated during the dry wiping time, but the retriggering mode is switched-off during this time.
Oscillator, Pin 6
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 discharge time. For the stability of the oscillator frequency, it is recommended that the selected R2 value be much greater than the internal resistance (2 kW), because the temperature response and the tolerances of the integrated resistance are considerably greater than the external resistance value. Oscillator frequency, f, is calculated as follows: f = 1/C2@(0.632@R2 + 1900) Minimum value for R2 = 68 kW Maximum oscillator frequency is 20 kHz. For further information, please refer to table 1, regarding relationship between oscillator frequency and different timings.
Rear Wiper Interval/Wipe-Wash Control, Figures 1 and 4
A single high-side switch at terminal L is responsible for all switching sequences. The water pump motor is con-
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U690B
Interval mode ON Pin 3 Pin 4 Pin 2 t1 t2 t3 Wipe / wash mode Pin 3 Pin 4 Pin 2 t1 t5 t6 tp t4 t1 t2 tp OFF tp
Wipe / wash mode with retrigger Pin 3 Pin 4 Pin 2 t1 tp: Operating time t1: Debounce time t2: Relay active t5
tp t2
94 8870
t3: Interval time t4: Interval pulse t5: Dry wiping time
t6: Retrigger
Figure 4. Pulse diagram for different modes - wipe/wash
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U690B
Table 1. Time for rear wiper interval operation
Index t 1 2 3 4 5 6 7 8 9
Description Interval ON (first pulse) Interval ON (following pulses) Interval pause (except first pause) Pause (dry wiping interval pulse) Dry wiping time min/max Gate for retrigger Min/max lengthening at retrigger Debounce time min/max Recognition time for dry wiping min/max
Oscillator Clocks 252 256 2816 1024 1738/1810 8 248/256 16/24 240/248
fosc
(Hz)
1 (ms) 840 813 788 764 741 720 700 681 663 646 630 615 600 586 573 560 548 536 525 514 504
2 (ms) 853 826 800 776 753 731 711 692 674 656 640 624 610 595 582 569 557 545 533 522 512
3 (s) 9.387 9.084 8.800 8.533 8.282 8.064 7.822 7.611 7.411 7.221 7.040 6.868 6.705 6.549 6.400 6.258 6.122 5.991 5.867 5.747 5.632
4 (s) 3.410 3.300 3.197 3.100 3.009 2.923 2.842 2.765 2.692 2.623 2.558 2.495 2.436 2.379 2.325 2.273 2.224 2.177 2.131 2.088 2.046
5min 5max (s) 5.790 6.030 5.603 5.835 5.428 5.653 5.264 5.482 5.109 5.321 4.963 5.169 4.825 5.025 4.695 4.889 4.571 4.761 4.454 4.638 4.343 4.523 4.237 4.412 4.136 4.307 4.040 4.207 3.948 4.111 3.860 4.020 3.776 3.933 3.696 3.849 3.619 3.769 3.545 3.692 3.474 3.618
6 (ms) 27 26 25 24 24 23 22 22 21 21 20 20 19 19 18 18 17 17 17 16 16
7min 7max (ms) 827 853 800 826 775 800 752 776 729 753 709 731 689 711 670 692 653 674 636 656 620 640 605 624 590 610 577 595 564 582 551 569 539 557 528 545 517 533 506 522 496 512
8min 8max (ms) 53 80 52 77 50 75 48 73 47 71 46 69 44 67 43 65 42 63 41 62 40 60 39 59 38 57 37 56 36 55 36 53 35 52 34 51 33 50 33 49 32 48
9min 9max (ms) 800 827 774 800 750 775 727 752 706 729 686 709 667 689 649 670 632 653 615 636 600 620 585 605 571 590 558 577 545 564 533 551 522 539 511 528 500 517 490 506 480 496
300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500
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U690B
Absolute Maximum Ratings
Reference point Pin 1 ( 31), unless otherwise specified Parameters Operating voltage, static 5 min., Terminal 15 Ambient temperature range Storage temperature range Junction temperature Symbol VBatt Tamb Tstg Tj Value 24 -40 to +95 -55 to +125 150 Unit V C C C
Thermal Resistance
Parameters Junction ambient DIP 8 Symbol RthJA Value 110 Unit K/W
Electrical Characteristics
Reference point Ground (Pin 1), Tamb = 25_C, VBatt = 12 V, unless otherwise specified, see basic circuitry figure 2 Test Conditions / Pin Symbol R1 1 kW VBatt t < 5 min t < 60 min Stabilized voltage I8 = 10 mA Pin 8 V8 Low voltage detection Terminal 15 VBatt Relay control output Pin 2 Saturation voltage I 200 mA V2 I 100 mA Internal Z-diode I2 = 10 mA Pin 2 Vz Oscillator f = 0.001 to 20 kHz Pin 6 Integrated discharge V6 = V8 r6 resistor Switching threshold voltage lower V6L upper V6H Input current V6 = 0 V -I6 Hysteresis current Pin 7 -I7 Saturation voltage I7 = -l00 mA Pin 7 V7-8 Programming input Pin 5 Pull-up resistor r5 Temperature drift of r5 TC Switching threshold voltage V5 Signal input, R3 = 1 kW (min), fig.1, Pin 3 Input current V3 = 2 V - I3 Threshold voltage ON V3 OFF Internal Z-diode I3 = 10 mA V3 I3 = -10 mA -V3 Retrigger R4 = 1 kW (min), fig. 1, Pin 4 Threshold voltage ON V4 OFF Internal Z-diode I4 = 10 mA V4 I4 = -10 mA -V4 Integrated pull-up resistor r4 Temperature drift of r4 TC () Parameters Operating voltage
w
Min 6.0
Typ
Max 16.0 24.0 18.0 5.0 1.5 1.2 23 2.4
Unit V V V V V kW V
4.0
7.35 4.5
20 1.6
21 2.0 1.8 4.6
100 40 50 0.45 2
1 200 200 60
mA mA
mV kW %/deg. V
2.1 1.6 7.5 0.7 2.1 1.6 7.5 0.7 50 0.45
0.5 2.3 1.8
mA
V V
2.3 1.8
V V
40
kW %/deg. Rev. A2, 28-Apr-97
60
U690B
Applications
Frequency Comparator Speed Depending Switch with Hysteresis, Figure 5
This circuit can be used to activate a load, such as a warning lamp or buzzer via the relay (terminal A) at a certain speed. The speed information is applied to signal input, Pin 3, e.g. from Hall generator via terminal V. It is compared in the integrated circuit with a reference frequency created by the oscillator. The oscillator frequency, f, is generated with external resistor, R2kR7, and capacitor, C2. If the frequency at Pin 3 is less than f/64, the relay control ouput is deactivated. If the frequency at Pin 3 is greater than f/64, the relay control output is activated and at the same time the hysteresis output, Pin 7, is disabled, the frequency is reduced. This means Pin 7 supplies no current for charging the capacitor, C2; therefore, R2 and C2 alone define the oscillator frequency i.e., f [ R2@C2. The hysteresis frequency is determined with the resistor, R7.
8 C1
94 8866
R2 R7 8 C1 7 6 C2 5
R1
D1
15
R8
U690B
Relay 1 2 3 4 D2 C 3 R3 Z1 V 31 A
Figure 5. Speed switch R2 C 2 R7 7 6 5
R1
D 1
15
Motor Speed Depending Switch with Hysteresis, Figure 6
This circuit, figure 6, has the same function as the speed with hysteresis mentioned above. Information regarding motor speed (rpm) from the ignition coil is delivered to signal input, Pin 3, via terminal 1. Resistor values, R3 and R5 are so dimensioned, that there is a peak voltage of nearly 3 V at Pin 3 (from the ignition coil). Pin 4 is connected to GND, so that there is a bypass for debouncing. In this way, ignition pulse is supplied to frequency comparator.
U 690 B
Relay 1 2 3 4 1 R5 R3 31 A
94 8867
Figure 6. Motor speed switch with hysteresis
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U690B
Package Information
Package DIP8
Dimensions in mm
9.9 max 1.64 1.44 4.5 3.9 6.4 max 0.5 min 0.58 0.48 7.62 8 5 2.54 2.5 0.39 max 9.75 8.15 7.82 7.42
technical drawings according to DIN specifications 13039
1
4
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U690B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
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