Datasheet > ELM408SM

ELM408SM

更新时间： 2024-09-15 11:46:03

品牌	Logo	应用领域
ELM		解码器
页数	文件大小	规格书
10页	57K
描述
Rotary Decoder - 2 wire Interface

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ELM408SM 数据手册

ELM408

Rotary Decoder - 2 wire Interface

Description

Features

The ELM408 is an 8 pin integrated circuit that is

• Low power CMOS design

used to convert the output from a rotary encoder into

two signals (chip select, 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.

• Wide supply range – 2.0 to 5.5 volts

• Complete debouncing of the encoder inputs

• No external filtering needed

• 2x and 4x decoding

• Can generate a write sequence

• Startup delay timer

There is no need for external filtering or

debounce circuits with the ELM408, as this is all

performed within the integrated circuit. After

debouncing the encoder signals, the ELM408

determines the direction of shaft rotation, and then

generates the appropriate outputs. A write sequence

can also be generated if the Write Enable input is at

a high level when the outputs are generated.

• High current drive outputs

Connection Diagram

PDIP and SOIC

(top view)

The ELM408 provides both 2x and 4x decoding

of a rotary encoder signal. See the Output

Waveforms section for more information.

VDD

VSS

Applications

U/D

4x/2x

• Digital audio potentiometer controls

• Variable voltage or temperature circuits

• Positioning controls

Write

Enable

• Tuning circuits

Block Diagram

VDD

Debounce

Circuit

Direction

Decoding

Output

Logic

VDD

U/D

Debounce

Circuit

Rotary

Encoder

Write

Enable

4x/2x

ELM408DSA

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