USB-AD12f
Page 4
4.1.2
Connecting a push-button /
switch
Please make sure to use a push-button with
debounce protection, because otherwise
several pulses might be recorded.
The 3.9k
Ω
pull-down resistor is absolutely
necessary to create a defined low signal!
4.1.3
Connecting a voltage divider
If connecting a DC voltage higher than 5V,
a voltage divider must be used so that 5V
at the maximum are applied at the device
input. Exceeding the 5V input voltage
might cause damages to the device.
The relation between the two resistors to be
used is calculated with the following
formula:
U/U
1
= (R
1
+R
2
)/R
1
Input voltages less than 5V are also
sufficient (
high
≥
3V).
4.1.4
Connecting a counter
The 16-bit counter is available at Digital In
1.
At maximum performance (2
16
-1), the
counter is reset and starts from zero again.
NORM ELECTRONICS Ltd
www.norm.gr
Tel. 210 3234988
