ELM405 datasheet(1/10 Pages) ELM

No de pièce	ELM405

Description	Rotary Decoder - 3 wire 4x Interface

PDF	10 Pages

Scroll/Zoom	100%

Fabricant	ELM [ELM Electronics]

Site Internet	http://www.elmelectronics.com

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1 / 10 page

ELM405

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

Connection Diagram

PDIP and SOIC

(top view)

VDD

VSS

1

2

3

4

8

7

6

5

Rotary Decoder - 3 wire 4x Interface

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).

Clk

A

B

Description

• Digital audio potentiometer controls

• Variable voltage or temperature circuits

• Positioning controls

• Tuning circuits

Applications

Block Diagram

1 of 10

• 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

Features

ELM405DSA

CS

U/D

Clk

Invert

B

7

A

Debounce

Circuit

2

CS

5

VDD

Direction

Decoding

4

Clk

Invert

VDD

Output

Logic

3

U/D

Rotary

Encoder

Debounce

Circuit

6

Clk

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