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U840B

Digital / Wipe-Wash Control for Rear or Front Wiper

Description

The circuits U840B (DIP8) and U840B-FP (SO8) are

designed as interval wipe/ wash timer for automotive

applications. The interval pause t

3

can be set in a range

from 0.8 s to 22 s by an external 30 k

W

potentiometer. All

other time periods are determined by the basic frequency

f

0

of the oscillator. The wipe/ wash (WIWA) mode has

priority over the interval mode. The program Pin PP

controls, whether the wiper immediatly starts to wipe, or

with a delay time t

4

of 0.8 s. The inputs CP and INT are

digital debounced, the turn-on as well as the turn-off.

The integrated relay driver is protected against short

circuits and is switched to conductive condition in the

case of a load-dump. The circuit is protected with the

recommended external circuitry against load-dump and

RF interference, refer to ISO 7637鈥?/3 (DIN 40839).

Features

D

Interval-switch A and B to GND

D

Wipe/ wash push button to V

Batt

D

Output driver protected against short circuit digital

debounced: t

6

= 10 ms

D

Program Pin PP determines turn-on delay t

4

during

wipe-wash mode

PP to GND: t

4

= 0.8 s

PP to V

S

: t

4

= 0 s

Interval mode: t

4

= 0 s

D

D

D

D

All time periods digital determined by RC-oscillator

Turn-on time of relay t

2

= 375 ms

Adjustable interval pause, t

3

= 0.8 to 22 s

Dry wiping time t

5

= 3.7 s

D

Inputs CP and INT digital debounced, t

1

= 100 ms

D

All inputs with integrated RF protection

D

Load-dump protected and interference protection

according to ISO 7637鈥?/3 (DIN 40839)

Ordering Information

Extended Type Number

U840B

U840B-FP

Package

DIP8

SO8

Remarks

Pin Description

Pin

1

2

3

4

5

6

7

8

Symbol

INT

CO

RO

PP

WASH

V

S

GND

OUT

Function

Interval input

C oscillator

R oscillator

Program pin

Wash signal

Supply voltage

Ground

Output

INT

1

8

OUT

CO

RO

2

7

GND

U840B

3

6

Vs

WASH

13299

PP

4

5

Figure 4. Pinning

TELEFUNKEN Semiconductors

Rev. A2, 03-Feb-97

1 (8)

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U840B-FP相關(guān)型號(hào)PDF文件下載

• 型號(hào)
  版本
  描述
  廠商
  下載
• U840A
  英文版
  TOILET TISSUE DISPENSER
  ETC [ETC]
  U840A
• U840B
  英文版
  Digital / Wipe-Wash Control for Rear or Front Wiper
  TEMIC
  U840B
• U840B
  英文版
  Digital / Wipe-Wash Control for Rear or Front Wiper
  TEMIC [TEM...
  U840B
• U840B-FP
  英文版
  Digital / Wipe-Wash Control for Rear or Front Wiper
  TEMIC
  U840B-FP
• U840B-FP
  英文版
  Digital / Wipe-Wash Control for Rear or Front Wiper
  TEMIC [TEM...
  U840B-FP

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