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U846B
Digital Wiper Control for Intermittent and Wipe/ Wash Mode
Description
The U846B is a bipolar integrated circuit for automotive use ("Rugged Silicon") in interval and wipe/ wash control of windshield or backlite wipers. The interval pause can be set individually within a wide range by using a potentiometer. Wipe / wash mode with dry wiping activated either for 2 wipes or for a certain time has priority over the interval mode. The U846B is used in applications to control wiper motors with or without park-switch signal feedback. The integrated relay driver is protected against short circuits and is switched to conductive condition in the case of a load-dump. By using only a few external components, protection against RF interference and ISO transients can be achieved.
*
*
Features
D Interval input: high side D Wipe/ wash input: high side D Park input: low side (park position) D Output driver protected against short circuits D All time periods determined by an RC-oscillator D Typical relay activation time of 500 ms D Adjustable interval pause from 1.2 s to 27 s D D D D D D D
Typical pre-wipe delay of 100 ms Dry wiping - With park-switch signal: 2 cycles - Without park-switch signal typically 5.25 s Inputs INT, WASH and PARK digitally debounced All inputs with integrated RF protection Load-dump protection and interference protection according to ISO 7637-1/4 (DIN 40839)
Application
Digital interval / wipe/ wash control for windshield or backlite wiper motors with a 22-kW potentiometer (typical value) for interval pause adjustment. Recommended oscillator circuitry: R6 = 36 kW ; C2 = 100 nF.
Ordering Information
Extended Type Number U846B U846B-FP Package DIP8 SO8 Remarks
Pin Description
AAAAAAAA A A AAAAAAAAAAAAAAA AA A A AAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAA AA A AA AAAAAAAAAAAAAAA AAAAAAAAAAAAAAA AAAAAAAAAAAA AAAAAAA A AA AA AAAAAAAAAAAAAAA AAAAAAAA A AAAAAAAAAAAAAAA AAAAAAAA AAA
TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
Pin 1 2 3 4 5 6 7 8
Symbol INT C R PARK WASH VS GND OUT
Function Interval input Oscillator C Oscillator R Park-switch input Wipe/wash input Supply voltage Ground Relay output
INT
1
8
OUT
C R
2
7
GND
U846B
3 6 Vs WASH
12749
PARK 4
Figure 13. Pinning
5
1 (13)
U846B
Block Diagram
VS 6 GND 7
22 V
Stabilization POR load-dump detection 8 28 V
IRef INT 1 15 V 20 pF WASH 5 100 kW 20 pF PARK 4 20 kW 20 pF 15 V 15 V
- + 0.5 VS + -
OUT
Logic
+ -
250 mV
0.5 W
+ -
Oscillator
3 kW
U846B
2 C
15 V 3 R
15 V
11632
Figure 1.
Basic Circuitry Power Supply
For reasons of interference protection and surge immunity, an RC circuitry has to be connected to the supply pin. Therefore, current limitation during transients and proper supply in the case of voltage drops is ensured. Recommended values: R1 = 180 W, C1 = 47 F. In order to protect the IC against reversed battery, a diode has to be added to the supply. With this configuration, the value of the external capacitor can be reduced to typically C1 = 10 F. The supply (Pin 6) is clamped with a 22-V Zener diode. The operation voltage may range between VBatt = 9 to 16 V. The recommended values are C2 = 100 nF, R6 = 36 kW. The oscillator frequency is approximately f0 320 Hz. The minimum value of R6 is 21 kW. The precision of the oscillator frequency is determined by the accuracy of the integrated oscillator (approximately 5%) and the tolerances and temperature coefficients of the external components. A 1% metallic-film resistor and a 5% capacitor with only a small temperature co-efficient are recommended.
[
Oscillator
All time sequences refer to the frequency of the RC oscillator. Its capacitor is charged by integrated current sources and is discharged via a small integrated resistor. The basic frequency, f0, is determined by the capacitor, C2, an internal 3 kW resistor and the external resistor R6 according to the formula: f0
Timing
Table 1 shows how to calculate the timing (debouncing and delay times). The recommended timing is based on the oscillator frequency f0 = 320 Hz. Synchronized times are derived from the oscillator with different numbers of divider stages. Asynchronous times are generated by the internal clock and the randomly applied input signals which result in a "digital uncertainty".
[ 1 / (0.8
C2 (R6 + 3 kW))
2 (13)
TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
U846B
VBatt 47 mF C1 8 OUT 7 GND 6 VS 5 WASH R1 180 W R5 47 kW WASH switch
U846B
INT 1 INT switch R2 2 kW C 2 C2 R 3 R6 PARK 4 R4 10 kW PARK switch
11633
R3 typ.22 kW
100 nF 36 kW
Figure 2. Basic circuitry
1
2
3
CL ~ ~ OUT ON ~ ~ tDINTR or tDWASHR ~ ~
11708
OFF IC >500 mA SC
tDSC
Figure 3. Debouncing of the short circuit detection and reset of the latched short circuit detection
TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
~ ~
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Synchronized Times Typical Values with f0 = 320 Hz Relay activation time t1 = 500 ms t1 = 160 1 / f0 Interval pause t2 = 440 * 1 / fINT t2 = 440 1 / fINT Dry wiping t3 = 5.25 s or 2 wipes t3 = 1680 1 / f0 or 2 wipes POR prolongation tDPOR = 25 ms tDPOR = 8 1 / f0 Asynchronous Times Debouncing time INT D Forward tDINT = 100 ms tDINT = (32 +/- 4) 1 / f0 D Reverse tDINR = 100 ms tDINR = (32 +/- 4) 1 / f0 Debouncing time WASH D Forward tDWASH = 100 ms tDWASH = (32 +/- 4) 1 / f0 D Reverse tDWASHR = (32 +/- 4) 1 / f0 tDWASHR = 100 ms Debouncing time PARK D Forward tDPARK = 25 ms tDPARK = (8 + 4) 1 / f0 D Reverse tDPARKR = 25 ms tDPARKR = (8 + 4) 1 / f0 Debouncing time SC tDSC = 10 ms tDSC = (3 +/- 1) 1 / f0 For the calculation of "fINT": see chapter "Functional Description" on page 4
ON OFF INT or WASH
Table 1. Times
3 (13)
U846B
Asynchronous Debouncing Times
Ditigal debouncing by clock count makes all inputs insusceptible to short interference pulses. The switch input stages INT, WASH, PARK are debounced at the positive and negative edge (reverse debouncing). The debouncing times vary (digital uncertainty). This is caused by the asynchronism between the random input signal and the IC clock CL. Short circuit debouncing is shown in figure 3. During the relay activation time, the output current is monitored at each positive edge of the clock. In the case of a detected short, a 3-stage shift register counts 3 negative edges. The output stage is disabled with the following positive edge. Depending on when the short circuit occurs, there is a variation of 1 clock: the delay time may last from 2 to 4 clock cycles. In the case of the other times, (e.g., debouncimg input INT) the digital uncertainty adds up to 4 cycles. current during the load-dump pulse (1A, short term). Short circuit detection is disabled during the load-dump.
Power-on Reset
When the supply voltage is switched on, an internal power-on reset pulse (POR) with a prolongation time of tDPOR = 25 ms is generated to set and hold the integrated logic at the condition which is defined initially. During tDPOR the relay output stage is kept disabled and the short circuit buffer is reset.
Functional Description
All timing periods refers to f0 = 320 Hz with R6 = 36 kW and C2 = 100 nF
Interval Function
The interval mode is activated with the high side input switch INT. After the debouncing time tDINT the relay is activated and the wiper motor performs one turn. The beginning of the interval pause depends on the application "with or without the park-switch" (see figures 5, 6, 7 and 8). If the INT switch is opened the wiper performs a full turn as long as the relay is energized.
Relay Output
The relay output is an open collector Darlington transistor stage with an integrated 28-V Zener diode which limits the relay coil`s inductive cut-out pulse. The maximum static collector current must not exceed 300 mA and the saturation voltage is typically Vsat = 1.2 V@ 200 mA. An integrated shunt resistor measures the collector current constantly. If a typical value of I8 = 500 mA is exceeded, the short circuit detection buffer is set. The output stage is switched off and is kept disabled even if an input switch is still on. When an input switch is opened, the short circuit buffer is reset after the debouncing delay and the output can be activated again. If after closing an input switch again a persistant short is detected, the short circuit buffer is set again and the output is disabled. If no short circuit condition is detected normal operation continues. In order to avoid short term disabling caused by current pulses of transients, a typical debounce period (tDSC = 10 ms) is provided (see figure 3). During a load-dump pulse (VBatt > 30 V), the output transistor is switched to conductive condition to prevent it from being destroyed. The output transistor absorbs the
Contact Current and Leakage Resistance
As the current into Pin 1 (INT) only ranges from 200 mA to 800 mA (depending on the potentiometer value), an external pull-down resistor helps to increase the contact current of the interval switch INT. The input is detected "open" and the intermittent function is not activated if the input resistance of Pin 1 exceeds 45 kW.
Timing of the Interval Pause t2
During the interval pause the oscillator frequency is switched from f0 to fINT. Thus the frequency-determing resistor is now (R2 + R3). The frequency is calculated approximately by using the following formulas: fINT t2
*
*
[ 4.4/ (57 [ 5700 C
C2
(R2 + R3))
2
(R2 + R3)
Correct operation is ensured, with 2 kW < (R2 + R3) < 40 kW With the recommended value of C2 = 100 nF, the pause time can be adjusted to 1 s < t2 < 27 s (see figure 4). When the interval pause has been completed the oscillator is switched to its basic frequency f0.
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TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
U846B
28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 2
96 12008
Interval Function with Park-Switch Feedback
During the relay activation time, t1, the wiper motor`s park-switch leaves its park position and changes its potential from GND to VBatt. The output is kept active as long as the park-switch stays at high potential, even if the relay activation time has expired in the meantime. If the park-switch is connected to the PARK input (Pin 4), the interval pause t2 starts after the 25 ms debounce time tDPARK (see figures 5 and 6).
7 12 17 22 27 32 37 42 47
t 2 - Interval Pause ( s )
R2 + R3 ( kW )
Figure 4. Pause time t2/ s versus resistor (R2 + R3)/ kW
If the INT switch is opened while the relay is still energized, the wiper motor turns on until it reaches its park position. The motor current can flow only via the relay contact.
11635
INT
VBatt tDINT 0V t1 VBatt t1
OUT
0V t2 VBatt 0V tDPARKR
PARK
tDPARKR
MOTOR
ON OFF
Figure 5. Intermittent circuit function with park-position feedback
TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
5 (13)
U846B
Relay R1 180 W R5 47 kW
8
7
6
5
U846B
1 R2 6.2 kW 2 C2 3 R6 4 R4
C1 47 mF 10 V
100 nF 36 kW 10 kW
R3 S1 Park switch M S2 15 kW OI 1/2 WIWA M 31
Wiper motor
Interval switch Figure 6. Application circuit with park-switch feedback
Water pump
15
11634
Interval Function without Park-Switch Feedback
This configuration is used mainly if the relay is mounted directly to the wiper motor. The PARK input (Pin 4) can be left open (internal pull-down resistor). During the relay activation time, the motor current flows via the relay contact. When the relay is switched off, the park-switch takes over the current (see figure 7). The interval pause starts at the end of the activation time of the relay (see figure 8). If the INT switch is opened while the relay is still energized, the wiper motor turns on until it reaches its park position. The motor current flows via the parkswitch contact.
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TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
U846B
180 W R1 R5 47 kW
8
7
6
5 C1 47 mF 10 V 4 R6 36 kW
U846B
1 R2 6.2 kW 100 nF 2 C2 3
R3 S1 Park switch M S1 15 kW OI 1/2 WIWA M 31
Wiper motor
Interval switch
Water pump
15
11636
Figure 7. Application circuit without park-position feedback
VBatt
INT
0V VBatt
tDINT
OUT
0V t1 ON t2 t1
MOTOR
OFF
11637
Figure 8. Intermittent circuit function without park-position feedback
TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
7 (13)
U846B
Wipe/ Wash Operation
VBatt
11638
WASH
0V OUT
0V tDWASH VBatt tDPARKR
PARK
0V
ON
MOTOR
OFF Figure 9. Wash operation with park-switch signal
When the WASH switch is closed, the relay is activated after the debounce time, tDWASH. As long as the switch is pushed, the wash pump sprays water on the windscreen. When the WASH switch is released, the dry wiping starts after the "reverse" debouncing time tDWASHR = 100 ms
nal counter counts 2 positive edges of the park-switch i.e., 2 full cycles for dry wiping (see figure 9).
Wipe/ Wash Mode without Park-Position Feedback
If the U846B is used without the wiper motor's parkswitch, Pin 4 is fixed to low potential (integrated pull-down resistor). Therefore, the driver stage is switched off after the dry wiping time t3 is finished, but the wiper motor is supplied via its park-switch until the park position is reached.
Wipe/ Wash Mode with Park-Position Feedback
With the park input of the circuit connected to the wiper motor`s park-switch, the output stays active until an inter-
VBatt
11639
WASH
0V OUT
0V tDWASH ON t3
MOTOR
OFF Figure 10. Wash operation without park-signal feedback
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TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
U846B
Wipe/ Wash Mode Priority
With built-in priority for the wipe / wash mode, the interval function is interrupted as soon as the WASH switch is operated longer than the debounce time tDWASH. The interval mode continues with a relay activation time t1 (see figures 11 and 12) either with or without parkswitch feedback, after the relay activation time is finished (no park-switch feedback) or after the second wipe (parkswitch fedback). In this case, 3 wipes are performed.
11640
VBatt
INT
0V VBatt
WASH
0V tDINT VBatt t1 tDWASH tDWASHR t1 tDPARKR
OUT
0V VBatt
PARK
0V
1
2 wipes
3
ON
MOTOR
OFF Figure 11. Wipe/ wash priority with park-position feedback
VBatt
11641
INT
0V tDWASHR VBatt
WASH
0V tDINT VBatt tDWASH t3 t1
OUT
0V t1 ON t2 t1
MOTOR
OFF Figure 12. Wash/ wipe priority without park-position feedback
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VBatt = 13.5 V, Tamb = 25C, reference point ground (Pin 7), unless otherwise specified Circuit with recommended external circuitry (see figure 2)
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Absolute Maximum Ratings Thermal Resistance
Junction ambient Parameters DIP8 SO8 Symbol RthJA RthJA Maximum 110 160 Unit K/W C C C
Electrical Characteristics AAAAAAAAA AAAAA AAAAA
U846B
10 (13) Pull-down resistance External series resistance Pull-down resistance External series resistance WASH input Pin 5 Protective diode Internal capacitance Threshold Parameters Supply Supply voltage range Supply current Undervoltage threshold POR Series reistor Filter capacior Internal Z-diode INT input Pin 1 Protective diode Internal capacitance Leakage resistance External series resistance PARK input Pin 4 Protective diode Internal capacitance Threshold Parameters Supply voltage t = 60 s t = 600 s Ambient temperature range Storage temperature range Maximum junction temperature All switches open Test Conditions/ Pin Symbol Symbol VBatt VBatt Tamb Tstg Tj VBatt I6 V6 R1 C1 V6 R5 RS5 R4 RS4 V5 C5 V5 V4 C4 V4 V1 C1 R RS
Min.
TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97 2 9 Value 24 18 -40 to +100 -55 to +125 150 15 20 0.5 V6 100 15 20 0.5 V6 20 10 15 20 45 Typ. 1.6 4 180 47 22.5 0.5 R5 40 16 Max. Unit V Unit V mA V kW kW kW kW V pF kW kW V pF V V pF V
W
F V
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Electrical Characteristics (continued)
Dry wiping Without park-switch feedback With park-switch feedback Tolerances of max. pause time Relay activation time Tolerances of min. pause time
TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
D Short circuit detection
D PARK input p
D WASH input p
Parameters Test Conditions/ Pin Relay output Pin 8 Saturation voltage I8 = 100 mA Saturation voltage I8 = 200 mA Relay coil resistance Output current Normal operation Output pulse current Load-dump Internal Z-diode Short circuit threshold Reverse current Oscillator input C Pin 2 Oscillator capacitor Pin 2 Basic frequency C2 = 100 nF, R3 = 36 kW Lower switching point Upper switching point Internal discharge resistance Protective diode I = 10 mA Oscillator input R Pin 3 Oscillator resistor Integrated resistor Integrated Z-diode Times External circuitry - see oscillator input (figure 2) Debouncing Times D INT input p
VBatt = 12 V, Tamb = 28 10C R1 = 0 to 15 kW, R3 = 6.2 kW VBatt = 12 V, Tamb = 28 10C R1 = 0 to 15 kW, R3 = 6.2 kW
tDINT tDINTR tDWASH tDWASHR tDPARK tDPARKR tDSC t1 t2min
Symbol
t2max
V8 V8 RRel I8 I8 V8 I8 I8
R3E R3i V3
C2 f0 V2 V2 R2 V2
t3
Min.
8.85
400 2.6
4.5
50 50
18
Typ.
5.25 2
3.48
100 320 1 2.75 500 15
28.5 500
11.8
100 100 100 100 25 25 10
1.0 1.2 60
36 3 14
U846B
14.75
Max.
625 4.35
125 125
100
300 1.5
6
s turns
Unit
mA A V mA A
11 (13) kW kW V ms ms ms ms ms ms ms ms s nF Hz V V
W
W
V
V V
s
U846B
Package Information
Package DIP8
Dimensions in mm
9.8 9.5 1.64 1.44 7.77 7.47
4.8 max 6.4 max 0.5 min 0.58 0.48 7.62 8 5 2.54 3.3 0.36 max 9.8 8.2
technical drawings according to DIN specifications 13021
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 0.2 3.8 6.15 5.85 5.2 4.8 3.7
technical drawings according to DIN specifications 13034
8
5
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TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
U846B
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
TELEFUNKEN Semiconductors Rev. A2, 03-Feb-97
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