Datasheet > ELM337

ELM337

更新时间： 2024-11-22 06:56:35

品牌	Logo	应用领域
ELM		开关
页数	文件大小	规格书
4页	31K
描述
LIGHT SWITCH

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数据手册

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ELM337 数据手册

ELM337

Light Switch

Description

Features

The ELM337 provides a convenient means to

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

• Operates from 3V to 5.5V

interface standard photocells or light dependent

resistors (LDRs) to digital logic circuits. It provides

an input comparator with hysteresis, line frequency

filtering, digital delays, and high current output

drivers all within the one 8 pin package.

• No external timing elements required

• Low parts count

• Digitally selected delays of up to 10 minutes

• Pulsed or continuous outputs

Three mode setting pins configure the ELM337

for pulse or continuous output and for a delay on

change of from 1 msec to 10 minutes. The transition

threshold is set with a single external resistor,

simplifying designs and minimizing costs.

• Internal line frequency filtering

• High current drive outputs - up to 25 mA

Applications need not be limited to those

employing photocells, as the Example Applications

section shows. The Schmitt trigger input provides a

convenient way to interface to virtually any input

signal, whether from digital logic or from a slowly

varying analog source. The remainder of the

ELM337 can simply be thought of as a time delay on

pickup and dropout type circuit - very useful for

sequencing processes.

Connection Diagram

PDIP and SOIC

(top view)

VDD

VSS

Applications

Light

Dark

LDR

• Automatic lighting controls

• Security light beam monitoring

• Position sensing

• Light controlled counters

• Time delay circuits

Block Diagram

Line

Frequency

Detector

Light

Dark

Output

Logic

Programmable

Timer

LDR

M2 M1 M0

ELM337DSA

Elm Electronics – Circuits for the Hobbyist

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