Datasheet > ELM415

ELM415

更新时间： 2024-10-30 04:17:19

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
5页	42K
描述
Up/Down Interface

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ELM415 数据手册

ELM415

Up/Down Interface

Description

Features

Many modern control circuits use the value from

• Low power CMOS design – typically 1mA at 5V

• Wide supply range – 3.0 to 5.5 volt operation

• Fully debounced switch inputs

a digital counter to directly determine a setting or

position. Manipulating this value under computer

control is not difficult, but when one has to interface

with a human operator, several other factors must be

considered. Human interfaces often require that the

circuit respond to changes in a setting – up or down,

left or right, clockwise or counterclockwise. These

controls need a simple interface, which the ELM415

provides.

• Internal pullup resistors provided

• Protection from simultaneous key presses

• High current drive outputs – up to 25 mA

• User selectable automatic repeat function

• Selectable Count output polarity

This 8 pin integrated circuit contains all the

timing and logic that is necessary to interface two

pushbuttons to most counter type interfaces. It reads

the position of the switches and translates that into

an appropriate signal for a counter to either

increment or decrement, which in turn controls the

output variable. Logic to filter out contact bounce, to

sense when both keys are pressed simultaneously,

to invert the count output, and to provide continuous

pulses if an input pushbutton stays pressed are all

included.

Connection Diagram

PDIP and SOIC

(top view)

VDD

Up/Down

Count

VSS

DownSw

UpSw

Repeat

Applications

Invert

• Digital audio potentiometer controls

• Variable voltage or temperature circuits

• Motor positioning controls

• Single-stepping control circuits

• Reset circuits

Block Diagram

VDD

Debounce

Circuit

DownSw

reset

Latch

set

Up/Down

VDD

Debounce

Circuit

UpSw

Pulse

Generator

Output

Control

Logic

Count

Repeat

Invert

ELM415DSA

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