U6032B_05 ATMEL [ATMEL Corporation], U6032B_05 Datasheet - Page 4

• Manufacturer Part Number: U6032B_05
• Description: Automotive Toggle Switch IC
• Manufacturer: ATMEL [ATMEL Corporation]

4.2
4
Oscillator, Pin 6
U6032B
Figure 4-2.
The oscillator frequency, f, is determined mainly by the R
mines the charge time, and the integrated resistance (2 k ) is responsible for the discharge
time. To ensure the stability of the oscillator frequency, it is recommended that the selected R
value is remarkably greater than the internal resistance (2 k ), as the temperature response and
the tolerances of the integrated resistance are considerably greater than the external resistance
value.
The oscillator frequency, f, is calculated as follows:
where
t
t
The debounce time, t
t
Table 7-1 on page 8
20 kHz.
f
1
2
3
1
1
1
=
= charge time =
= discharge time =
=
and
= 0.833 and
= 0.746 and
-------------- -
t
1
6
1
+
t
2
2
1
-- -
t
are constants, e.g.:
Basic Circuit for V
2
2
= 1.551 when C
= 1.284 when C
1
3
shows the relationship between t
, depends on the oscillator frequency, f, as follows:
V
2
R
S
V
= 5 V
2
Batt
2 k
C
2
S
C
2
2
= 5 V
2
= 470 pF to 10 nF
= 10 nF to 4700 nF
8
1
7
2
U6032B
R
2
3
, C
2
6
3
C
2
2
, R
C
circuit. The resistance, R
2
2
and frequencies from 1 Hz to
4
5
4771B–AUTO–11/05
2
, deter-
2