U6032B Datasheet, PDF (5/12 Pages) ATMEL Corporation – AUTOMOTIVE TOGGLE SWITCH IC

U6032B
Relay-control Output
Interference Voltages
and Load Dump
Power-on Reset
Relay-control Output
Behavior, Pin 2
Toggle Input, Pin 5
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.
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 (refer to Figure 6 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 with-
stand the generated current.
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 out-
put is disabled.
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 6 on page 6).
The relay becomes active if the time function is triggered, and the relay contact is inter-
rupted after the elapse of the delay time, t_d. There are two input possibilities.
When the push-button (TOGGLE) switch, S₁, is pressed for the first time, the relay
becomes active after the debounce time, t₃, i.e., the relay output, pin 2, is active.
Repeated operation of S₁ causes the interruption of the relay contact, thus disabling the
relay. Each operation of the toggle switch, S₁, changes (alters) the condition of the relay
output when the debounce time, td, is exceeded, i.e., the TOGGLE function.
If the relay output is not disabled by pressing the switch S₁, the output stays active.
Figure 5. TOGGLE Function
V_Batt
R_{1 510 Ω}
C₂
C₁
R₂
47 µF/
16 V ₈
7
6
S₁
20 kΩ
5
U6032B
1
2
3
4
5
4771A–AUTO–11/03