5

4771B–AUTO–11/05

U6032B

4.3

Relay-control Output

The relay-control output is an open-collector Darlington circuit with an integrated 23-V Z-diode

for limiting the inductive cut-off pulse of the relay coil. The maximum static collector current must

not exceed 300 mA and the saturation voltage is typically 1.1 V at 200 mA.

4.4

Interference Voltages and Load Dump

The lC supply is protected by R

by a series resistor, integrated Z-diode and RF capacitor (refer to Figure 4-4 on page 6).

The relay-control output is protected by the integrated 23 V Z-diode in case of short interference

peaks. It is switched to conductive condition for a battery voltage greater than 40 V in case of

load dump. The output transistor is dimensioned so that it can withstand the generated current.

4.5

Power-on Reset

When the operating voltage is switched on, an internal power-on reset pulse (POR) is generated

which sets the logic of the circuits to a defined initial condition. The relay output is disabled.

4.6

Relay-control Output Behavior, Pin 2

The time functions (relay output) can be started or interrupted by the three inputs ON, OFF or

TOGGLE (pins 3, 4 and 5, input circuit of these pins see Figure 4-4 on page 6).

The relay becomes active if the time function is triggered, and the relay contact is interrupted

after the elapse of the delay time, t

4.7

Toggle Input, Pin 5

When the push-button (TOGGLE) switch, S

active after the debounce time, t

Repeated operation of S

Each operation of the toggle switch, S

the debounce time, td, is exceeded, i.e., the TOGGLE function.

If the relay output is not disabled by pressing the switch S

Figure 4-3.

TOGGLE Function

47 µF/

16 V

510

Ω

R

2

C

2

V

Batt

1

2

6

5

87

3

4

20 k

Ω

S

1

U6032B

R

1

C

1