Description U641B bi-polar integrated circuit designed wiper appl

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Description U641B bi-polar integrated circuit designed wiper appl

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Interval Pause: After-wiping Time: Wiper Motor's Park Switch 0.6s Prewash Delay Wipe/Wash Mode Priority External Capacitor Determines Time Sequences Relay Driver with Z-diode Interference Protection According 0839 ISO/TR 7637/1 Load-dump Protected
Description
U641B bi-polar integrated circuit designed wiper application automotive market. includes wipe, wash internal mode.
Interval Wipe/Wash Wiper Control with Delay U641B
Functional Description
convenience feature windshield wiper, intermittent wipe/wash operation functions implemented most automobiles. U641B costeffective solution accurate timing function control. Wipe/wash mode priority over interval mode. Interval pause after-wiping time fixed values using resistors broad time range. Added value provided with individual, continuous adjustment interval pause potentiometer which built into stalk. proper operation, mandatory feed signal wiper motor's park switch into U641B.
Rev. 4773B-AUTO-09/05
Figure 2-1.
Block Diagram
PARK VRef Park switch comparator WASH VRef Input comparator
Load-dump comparator
VRef
Logic
VRef Wipe/wash comparator
Interval comparator
U641B
4773B-AUTO-09/05
U641B
Configuration
Figure 3-1. Pinning
PARK WASH
U641B
Table 3-1.
Description
Symbol WASH PARK Function Ground Interval switch Timing capacitor After-wiping time resistance Wipe/wash switch Park switch wiper motor Relay control output Supply voltage terminal
4773B-AUTO-09/05
Circuit Description
Interval Function,
closing interval switch, supply voltage, VBatt, relay activated. internal current source (pin which holds capacitor charged state switched-off. soon there positive potential park switch (S1), current source (see Figure page charges capacitor very quickly. After wiper operation finished, again ground potential, relay position interval pause begins capacitor discharged through current source till voltage below threshold Interval pause adjusted between with help potentiometer relay switches next interval cycle begins. Opening switch causes current source discharge immediately current sources switched off.
Wipe/Wash (WIWA) Operation,
closing WIWA switch, supply voltage, VBatt, water pump starts spraying water windshield. During this function, current source switched-off which keeps capacitor discharged state. capacitor charged through current source (after time interval approximately voltage capacitor greater than 6.1V, relay turned long switch WIWA closed. after-wiping time begins when switch open, sources switched source activated. Source discharges capacitor until voltage less than 2.2V. relay wiper-motor supplied park switch until park position reached. after-wiping time determined current source which regulated with external resistor RTime. When after-wiping time elapsed, source discharges capacitor. relay switch independent park switch
Interval WIWA Functions
interval function interrupted immediately when switch activated. current source discharges capacitor value afterwards, normal wash function starts. Interval wiping starts immediately when after-wipe time over. switching delays slightly shorter, because capacitor already charged value Wipe/Wash function interrupted when interval switch activated. interval function begins after WIWA function elapsed.
U641B
4773B-AUTO-09/05
U641B
Figure 4-1. Application Circuit with Interval Wipe/Wash Operation
Relay
U641B
Rtime
Park switch
WIWA
Wiper motor
Interval switch
Water pump
4773B-AUTO-09/05
Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions beyond those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Parameters Supply voltage 60s, terminal Supply current Relay control output current (DC) Park switch, Wipe/Wash switch, Interval switch, Power dissipation Tamb 90°C Storage temperature range Ambient temperature range Symbol VBatt Ptot Tstg Tamb Value +125 Unit
Pulse Current (Control Inputs)
Thermal Resistance
Parameters Junction ambient DIP8 Symbol RthJA RthJA Value Unit
U641B
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U641B
Electrical Characteristics
VBatt 12V, Tamb 25°C, reference point (see Figure page unless otherwise specified. Parameters Supply voltage Supply current Z-diode limitation Overvoltage Threshold current Threshold voltage Relay Control Output Saturation voltage Leakage current Park Switch Internal pull-up resistance Switching threshold voltage Protection diode Input Internal resistance Interval Input Protection diode WASH Input Switching threshold/ Hysteresis Protection diode Switching Characteristics Interval time Prewash delay After-wipe-time -150 tdel 4.75 10.8 5.25 5.75 13.2 mA/10 -1.4/ -5.4 -0.8 -0.8 -3.3 -0.8 -1.0 -1.5 VBatt Test Conditions Symbol VBatt Min. Typ. Max. 16.5 Unit
4773B-AUTO-09/05
Diagrams
Figure 8-1. Interval Pause (T);
Interval Pause
Rint Rint
Rint
Temperature (°C)
Figure 8-2.
After-wiping Time (T); VBatt
Rtime
After-wiping Time
VBatt Rtime
Rtime
Temperature (°C)
Figure 8-3.
Prewash Time (T);
Prewash Delay
VBatt VBatt
Temperature (°C)
U641B
4773B-AUTO-09/05
U641B
Figure 8-4. Interval Pause (RINT);
Interval Pause
Interval Resistor
Figure 8-5.
After-wiping Time (T); VBatt
After-wiping Time
Rtime
VBatt Rtime
Rtime
Temperature (°C)
4773B-AUTO-09/05
Ordering Information
Extended Type Number U641B-MY U641B-MFPY U641B-MFPG3Y Package DIP8 Remarks Pb-free Tubed, Pb-free Taped reeled, Pb-free
Package Information
Package: DIP8 Dimensions max. 9.6±0.1 1.2±0.3 4.2±0.3 3.6±0.1 7.62±0.15
0.53±0.05
6.3±0.1
0.36 max.
2.54 nom.
1.54
2.54 7.62 nom.
8.75±0.8
0.65
technical drawings according specifications
Drawing-No.: 6.543-5040.01-4 Issue: 16.01.02
U641B
4773B-AUTO-09/05
U641B
Package
Dimensions
5.00 4.85 1.27 3.81 0.25 0.10 6.15 5.85
technical drawings according specifications
Revision History
Please note that following page numbers referred this section refer specific revision mentioned, this document. Revision 4773B-AUTO-09/05 History datasheet template Pb-free logo page added Ordering Information page changed
4773B-AUTO-09/05
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4773B-AUTO-09/05

Description U641B bi-polar integrated circuit designed wiper appl

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