Features

Batt

1.

Description

The bi-polar long-term timer U6046B is designed to automatically limit the operation

time of high loads in the harsh automotive environment with a preset delay time. With

the power-on-reset function the timers guarantee that current consuming devices are

not operated unintentionally.

The delay time can be interrupted manually, but a retrigger function is not provided.

Figure 1-1.

Block Diagram with External Circuit

Stabilization

Power-on reset

Load-dump detection

Debouncing

Mono-flop

Relay control

output

Oscillator

Frequency divider

ON

OFF

TOGGLE

GND

OSC

V

S

V

stab

6

7

8

3

4

5

1

2

C

2

510

Ω

47

µF

V

Batt

OUT

R

2

C

1

R

1

Rear Window

Heating Timer/

Long-term

Timer

U6046B

Rev. 4674B–AUTO–09/05