U6046B_05 Datasheet, PDF (5/16 Pages) ATMEL Corporation – REAR WINDOW HEATING TIMER / LONG-TERM TIMER

U6046B
3.3 Relay Control Output (OUT)
The relay control output is an open-collector Darlington circuit with an integrated 23-V Z-diode to
limit the inductive cut-off pulse of the relay coil. The maximum static collector current must not
exceed 300 mA and saturation voltage is typically 1.1V at 200 mA.
3.4 Interference Voltages and Load-dump
The lC supply is protected by R₁, C₁, and an integrated Z-diode, while the inputs are protected
by a series resistor, integrated Z-diode and RF capacitor (see Figure 3-6 on page 8).
The relay control output is protected via the integrated 23-V Z-diode in the case of short interfer-
ence peaks. It is switched to a conductive condition for a battery voltage of greater than
approximate 40V in the case of a load-dump. The output transistor is dimensioned so that it can
withstand the current produced.
3.5 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.
Figure 3-3. TOGGLE Function
V _Batt
R₁
C₁
510 Ω
C₂
R₂
47 µF/
16 V ₈
7
6
S1
20 kΩ
5
U6046B
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4674B–AUTO–09/05