U6032B_05 Datasheet, PDF (3/12 Pages) ATMEL Corporation – Automotive Toggle Switch IC

U6032B
4. Functional Description
4.1 Power Supply, Pin 8
To achieve interference protection and surge immunity, the supply voltage (pin 8) must be pro-
vided with an RC circuit as shown in Figure 4-1. The dropping resistor, R₁, limits the current in
case of overvoltage, whereas C₁ smoothes the supply voltage at pin 8.
Recommended values are: R₁ = 510 Ω, C₁ = 47 µF.
An integrated Z-diode (14 V) protects the supply voltage, V_S, thus enabling stable operation in a
supply-voltage range of 6 V to 16 V, supplied by V_Batt.
It is possible to operate the integrated circuit with a 5 V supply, but it should be assured that
there are no interference voltages. In this case, pin 7 is connected to pin 8 as shown in Figure
4-2 on page 4, and the R₁C₁ circuit is omitted.
Figure 4-1. Basic Circuit for 12-V Supply and Oscillator
V_Batt
R_{1 510 Ω}
C₂
C₁
R₂
47 µF/
16 V ₈
7
6
5
U6032B
1
2
3
4
3
4771B–AUTO–11/05