U642B-MFPG3Y

U642B-MFPG3Y Datasheet


The U642B is a bi-polar integrated circuit designed for the wiper application in the automotive market. It includes wipe, wash and internal mode.

Part Datasheet
U642B-MFPG3Y U642B-MFPG3Y U642B-MFPG3Y (pdf)
Related Parts Information
U642B-MY U642B-MY U642B-MY
U642B-MFPG3 U642B-MFPG3 U642B-MFPG3
U642B-M U642B-M U642B-M
U642B-MFP U642B-MFP U642B-MFP
PDF Datasheet Preview
• Interval Pause 4 to 20 s
• After-wiping Time 2 to 20 s
• Wiper Motor's Park Switch
• Wipe/Wash Mode Priority
• One External Capacitor Determines All Time Sequences
• Relay Driver with Z-diode
• Interference Protection According to VDE 0839 or ISO/TR 7637/1
• Load-dump Protected

The U642B is a bi-polar integrated circuit designed for the wiper application in the automotive market. It includes wipe, wash and internal mode.

Functional Description

As a convenience feature of the windshield wiper, intermittent and wipe/wash operation fuctions are implemented in most of the automobiles. The U642B is a cost-effective solution for an accurate timing function control. Wipe/wash mode has priority over interval mode. Interval pause and after-wiping time can be set to fixed values by using resistors in a broad time range. Added value can be provided with an individual, continuous adjustment of the interval pause by a potentiometer which may be built into the stalk. For proper operation, it is mandatory to feed the signal of the wiper motor's park switch into U642B.

Figure Block Diagram

OUT 7

PARK
6 VRef

WASH
5 VRef

Load-dump comparator

Park switch Input comparator

Interval- and Wipe/Wash Wiper Control IC

U642B

VRef

Logic

Wipe/wash comparator

Interval comparator
1 GND

Pin Configuration

Figure Pinning

GND 1

INT 2 CT 3

U642B
7 OUT 6 PARK
5 WASH

Pin Description

WASH

PARK

Function Ground Interval switch Timing capacitor C2 After-wiping time resistance Wipe/wash switch Park switch for wiper motor Relay control output Supply voltage terminal 15
2 U642B

U642B

Circuit Description

Interval Function, Pin 2

By closing the interval switch, S2, to supply voltage, VBatt, the relay is activated. The internal current source pin 3 which holds the capacitor C2 in a charged state is switched-off. As soon as there is a positive potential at the park switch S1 , the current source F see Figure 1 on page 1 charges the capacitor C2 very quickly. After the wiper operation is finished, S1 is again at ground potential, the relay is in the off position - interval pause begins - the capacitor C2 is discharged through the current source C, till the voltage at pin 3 is below the threshold of 2 V. Interval pause can be adjusted between
4 s to 20 s with the help of potentiometer R3. Now the relay switches on and the next interval cycle begins. Opening of switch S2 causes the current source A to discharge C2 immediately and current sources C and F are switched-off.

Wipe/Wash WIWA Operation, Pin 5

Interval and WIWA Functions

By closing the WIWA switch, S3, to supply voltage, VBatt, the water pump starts spraying water on the windshield. During this function, the current source A is switched-off which keeps the capacitor C2 in a discharged state. Now the capacitor is charged through the current sources D and F. If after a time interval of approximately 100 ms the voltage at the capacitor is greater than V, the relay is turned on as long as the switch WIWA is closed.

The after-wiping time begins when the switch is open, the sources D and F are switched off and the source E is activated. Source E discharges the capacitor until the voltage is less than V. The relay is off and the wiper-motor is supplied via the park switch until the park position is reached. The after-wiping time is determined by the current source E which can be regulated with the external resistor RTime. When the after-wiping time has elapsed, the source A discharges the capacitor. The relay switch is independent of the park switch S1.

The interval function is interrupted immediately when the wipe/wash mode is activated. The current source A discharges the capacitor to a value of 2 V, afterwards, the normal wash function starts.
Ordering Information

Extended Type Number U642B-FP

Package DIP8 SO8

Package Information

Package DIP8

Dimensions in mm

Remarks
technical drawings according to DIN specifications

Package SO8

Dimensions in mm

U642B
technical drawings according to DIN specifications

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Datasheet ID: U642B-MFPG3Y 519514