U641B-FP

U641B ATMEL | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 10

Technical content

Features

 Interval Pause: 4 to 20 s  After-wiping Time: 2 to 20 s  Wiper Motor's Park Switch  0.6 s Prewash Delay  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

Description

The U641B is a bi-polar integrated circui t 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 opera- tion functions are implemented in most of the automobiles. The U641B 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 the U641B. Figure 1. Block Diagram

2 U641B

Figure 2. Pinning

1 GND Ground

2 INT Interval switch

3 CT Timing capacitor C

4 RT After-wiping time resistance

5 WASH Wipe/wash switch

6 PARK Park switch for wiper motor

7 OUT Relay control output

8 VS Supply voltage terminal 15

4773A–AUTO–11/03 Circuit Description Interval Function, Pin 2 By closing the interval switch, S 2, to supply voltage, V Batt, the relay is activated. The internal current source (pin 3) which holds the capacitor C2 in charged state is switched- off. As soon as there is a positive potential at the park switch (S 1), current source F (see Figure 1 on page 1) charges the capacitor C 2 very quickly. After the wiper opera- tion is finished, S 1 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 volt- age 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 R 3. Now the relay switches on and the next interval cycle begins. Opening switch S 2 causes current source A to discharge C 2 immediately and current sources C and F are switched off. Wipe/Wash (WIWA) Operation, Pin 5 By closing the WIWA switch, S3, to supply voltage, VBatt, the water pump starts spraying the water on the windshield. During this function, the current source A is switched-off which keeps the capacitor C 2 in a discharged state. No w the capacitor is charged through the current source F. If (after a time interval of approximately 600 ms) the volt- age at the capacitor is greater than 6.1 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 2.2 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 R Time. When the after-wiping time has elapsed, the source A discharges the capacitor. The relay switch is independent of the park switch S Interval and WIWA Functions The interval function is interrupted immediately when the switch S2 is activated. The cur- rent source A discharges the capacitor to a value of 2 V, afterwards, the normal wash function starts. Interval wiping starts immediately when the after-wipe time is over. The switching delays are slightly shorter, because the capacitor is already charged to a value of 2 V. The Wipe/Wash function is not interrupted when the interval switch S 2 is activated. The interval function begins after the WIWA function has elapsed.

4 U641B

Figure 3. Application Circuit with Interval and Wipe/Wash Operation

4773A–AUTO–11/03 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 Pin Symbol Value Unit Supply voltage t = 60 s, terminal 15 8 V Batt 28 V Supply current t = 2 ms t = 200 ms 1.5 150 A mA Relay control output current (DC) t = 200 ms 7 I7 200 1.2 mA A Pulse Current (Control Inputs) t = 200 ms Park switch, S Wipe/Wash switch, S3 Interval switch, S2 I mA Power dissipation T amb = 90/g176CP tot 500 mW Storage temperature range T stg -55 to +125 /g176C Ambient temperature range T amb -40 to +85 /g176C Thermal Resistance Parameters Symbol Value Unit Junction ambient DIP8 R thJA 120 K/W SO8 R thJA 160 K/W

6 U641B

4773A–AUTO–11/03

Electrical Characteristics

VBatt = 12 V, Tamb = 25°C, reference point is pin 8 (see Figure 3 on page 4) unless otherwise specified. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Supply voltage VBatt 91 6 . 5 V Supply current I 8 10 mA Z-diode limitation V 1 7.6 V Overvoltage Threshold current I1 -50 mA Threshold voltage V Batt 35 V Relay Control Output 7 Saturation voltage I7 = 100 mA I7 = 200 mA V7 -1.0 -1.5 V Leakage current I 7 100 µA Park Switch 6 Internal pull-up resistance R 6 = 10 k/g87 R6 50 k /g87 Switching threshold voltage V 6 -3.3 V Protection diode I6 = -10 mA I6 = 10 mA -0.8 7.6 V V Input Ct 3 Internal resistance R 3 100 /g87 Interval Input R2 = 2.7 to 30 k/g87 2 Protection diode I2 = -10 mA I2 = 30 mA/10 ms V2 -0.8 7.6 V WASH Input R5 = 10 k/g87 5 Switching threshold/ Hysteresis V5 -1.4/ -5.4 V Protection diode I5 = -10 mA I5 = 10 mA V -0.8 7.6 V Switching Characteristics R4 = 47 k/g87 to 300 k/g87, I4 = -150 µA Interval time R3 = 0 k/g87 R3 = 10 k/g87 t2 3.6 10.8 4.4 13.2 s Prewash delay t del 600 ms After-wipe-time R 4 = 130 k/g87 5t 5 4.75 5.25 5.75 s

8 U641B

Figure 7. Interval Pause = f (RINT); Ct = 22 µF Figure 8. After-wiping Time = f (T); Ct = 22 µF; VBatt = 16 V

4773A–AUTO–11/03

Package Information

Ordering Information

Extended Type Number Package Remarks U641B DIP8 – U641B-FP SO8 – 9.8 9.5 Dimensions in mm 1.64 1.44 4.8 max 0.5 min 3.3 0.58 0.48 7.62 2.54 6.4 max 0.36 max 9.8 8.2 7.77 7.47 technical drawings according to DIN specifications technical drawings according to DIN specifications Dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2

Printed on recycled paper. Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standar d warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibi lity for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time wi thout notice, and does not make any commitment to update the information contained her ein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel produc ts, expressly or by implication. Atmel’s products are not aut horized for use as critical components in life support devices or systems. Atmel Corporation Atmel Operations

2325 Orchard Parkway

San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza

77 Mody Road Tsimshatsui

Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Memory San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 Microcontrollers San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602

44306 Nantes Cedex 3, France

13106 Rousset Cedex, France

1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel: (44) 1355-803-000 Fax: (44) 1355-242-743 RF/Automotive Theresienstrasse 2 Postfach 3535

74025 Heilbronn, Germany

1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom Avenue de Rochepleine BP 123

38521 Saint-Egreve Cedex, France

www.atmel.com/literature 4773A–AUTO–11/03 © Atmel Corporation 2003 . All rights reserved. Atmel ® and combinations thereof are the registered tradem arks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others.