ELM401 View Datasheet(PDF) - Elm Electronics
Part Name
Description
Manufacturer
ELM401 Datasheet PDF : 8 Pages
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ELM401
Example Application
Figure 4 below shows how the ELM401 might be
used with a microprocessor. Power for the ELM401
has been obtained from the microprocessor circuit,
and a small capacitor has been added to ensure that
the supply is filtered. The positive supply has been
shown simply as VDD, since the ELM401 will operate
with any voltage from 2.0 to 5.5 volts.
The circuit uses 10 KΩ pullup resistors with the
rotary encoder signals in order to convert the signal
from the dry contacts into one that swings from VDD to
VSS. The momentary pushbutton contact from the
encoder is treated no differently than the ones from the
encoder wheel. Since both ICs share the same supply,
they can be directly connected as shown.
That’s about all there is to using the ELM401 in
your circuit. Connect pullup resistors to your rotary
encoder signals, connect the encoder signals to the
ELM401, then connect the ELM401 to the controlled
circuit. Use a common supply for all the devices, and
add a small bypass capacitor across the supply line.
The controlled devices can be digital pots,
microprocessors, or almost any circuit that will accept
CMOS signals. Enjoy!
VDD
VDD
VDD
0.01µF
10 KΩ
10 KΩ
10 KΩ
1
8
2
7
A
rotary
encoder
B
Sw
C
3
6
4
5
VDD
your microprocessor
port pins
Figure 4. Connecting the ELM401 to a microprocessor
ELM401DSB
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
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