ELM405 데이터 시트보기 (PDF) - Elm Electronics
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ELM405 Datasheet PDF : 10 Pages
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ELM405
Example Application
Figure 8 below shows how the ELM405 might be
used with a digital potentiometer (in this case, an
AD5220 from Analog Devices).
Pullup resistors of 10 KΩ are used with the rotary
encoder to provide voltages for the A and B inputs.
Power for the ELM405 and the AD5220 has been
supplied from a common source (it must be between
2.7V and 5.5V for the AD5220), and a small capacitor
has been added to ensure that the supply is filtered.
Note that the output lines are directly connected to the
AD5220 inputs, but we have added a 10 kΩ pullup
resistor on the CS line, to ensure that it rises rapidly to
the VDD level as quickly as possible after power up.
This may not be absolutely necessary in this case (as
the AD5220 setting only changes on the falling edge of
the clock signal), but it does not hurt to add it.
That’s about all there is to using the ELM405.
Connect pullup resistors to your rotary encoder,
connect the encoder signals to the ELM405, then
connect the ELM405 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!
10 KΩ
VDD
10 KΩ
VDD
0.01µF
1
2
3
A
B
4
rotary
encoder
C
VDD
8
10 KΩ
7
VDD
6
1
8
AD
5
2 5220 7
3
H
4
6
L
W
5
Figure 8. Connecting the ELM405 to an AD5220
ELM405DSA
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
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