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ELM405SM

Description
Rotary Decoder - 3 wire 4x Interface
File Size51KB,10 Pages
ManufacturerELM [ELM Electronics]
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ELM405SM Overview

Rotary Decoder - 3 wire 4x Interface

ELM405
Rotary Decoder - 3 wire 4x Interface
Description
The ELM405 is an 8 pin integrated circuit that is
used to convert the output from a rotary encoder into
three signals (chip select, clock and up/down) that
can be used to control various devices. The low
power CMOS technology used ensures that only a
very small current is required over the entire 2.0 to
5.5 volt operating range.
There is no need for external filtering or
debounce circuits with the ELM405, as this is all
performed within the integrated circuit. After
debouncing the encoder signals, the ELM405
determines the direction of shaft rotation, and then
generates the appropriate outputs. The polarity of
the clock output can be changed at any time to
accommodate different needs.
The ELM405 provides 4x decoding of a rotary
encoder signal. If your application requires 2x
decoding, please see the ELM404 (it is identical to
the ELM405 in every respect, except that it provides
2x decoding).
Features
Low power CMOS design
Wide supply range – 2.0 to 5.5 volts
Complete debouncing of the encoder inputs
No external filtering needed
4x decoding
Startup delay timer
• High current drive outputs
Connection Diagram
PDIP and SOIC
(top view)
V
DD
A
1
2
3
4
8
7
6
5
V
SS
CS
Clk
U/D
Applications
Digital audio potentiometer controls
Variable voltage or temperature circuits
Positioning controls
Tuning circuits
B
Clk
Invert
Block Diagram
V
DD
A
2
Debounce
Circuit
Direction
Decoding
Debounce
Circuit
Output
Logic
7
CS
Clk
U/D
6
V
DD
B
3
5
Rotary
Encoder
Clk
Invert
4
ELM405DSA
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
1 of 10

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