U6032B-FP ATMEL Corporation, U6032B-FP Datasheet - Page 4

• Manufacturer Part Number: U6032B-FP
• Description: AUTOMOTIVE TOGGLE SWITCH IC
• Manufacturer: ATMEL Corporation

Oscillator, Pin 6
4
U6032B
Figure 4. Basic Circuit for V
The oscillator frequency, f, is determined mainly by the R
determines the charge time, and the integrated resistance (2 k W ) is responsible for the
discharge time. To ensure the stability of the oscillator frequency, it is recommended
that the selected R
the temperature response and the tolerances of the integrated resistance are consider-
ably greater than the external resistance value.
The oscillator frequency, f, is calculated as follows:
where
t
t
a
a
a
The debounce time, t
Table 1 shows the relationship between t
f
t
1
2
3
1
1
1
=
= charge time = a
= discharge time = a
=
and a
= 0.833 and a
= 0.746 and a
-------------- -
t
1
6
1
+
´
t
1
-- -
2
t
2
are constants, e.g.:
2
2
= 1.551 when C
= 1.284 when C
V
2
S
1
V
value is remarkably greater than the internal resistance (2 k W ), as
= 5 V
Batt
3
´ R
, depends on the oscillator frequency, f, as follows:
2
´ 2 k W ´ C
2
´ C
S
2
= 5 V
2
2
2
= 470 pF to 10 nF
= 10 nF to 4700 nF
8
1
3
, C
2
, R
2
7
2
U6032B
R
and frequencies from 1 Hz to 20 kHz.
2
3
6
2
C
C
2
2
circuit. The resistance, R
4
5
4771A–AUTO–11/03
2
,