Datasheet > ELM334P

ELM334P

更新时间： 2024-01-17 13:43:48

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
4页	33K
描述
GARAGE DOORMAN

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ELM334P 数据手册

ELM334

Garage Doorman

Description

Features

The ELM334 is a handy circuit for remotely

• Low power CMOS design

monitoring the position of your garage door. A two-

wire interface is all that is needed to convey the

position of the door to two remotely located LEDs,

and to also provide control for an electric opener if

desired.

• Wide supply range - 3.0 to 5.5 volt operation

• Simultaneous monitoring of three inputs

• Fully debounced inputs

• Two wire interface

This circuit continually monitors the state of two

position sensing switches, representing the fully

open and fully closed positions of the door. After

suitable debouncing, the states of these switches

are used to vary the polarity of the two signal wires,

resulting in either the red (open) or green (closed)

LED turning on. When the door is in neither position

(moving), the LEDs rapidly alternate between the

two colours.

• Stuck button protection on the control output

• Control function is an optional addition

Connection Diagram

PDIP and SOIC

(top view)

If desired, circuitry to detect a short between the

two LED wires can be added and used to operate a

control output. If the door is equipped with a

standard electric opener, this control signal can be

used to operate the door. Refer to the Example

Application section for further details.

VDD

RLED

GLED

VSS

OpenSw

ClosedSw

Control

Applications

• Garage door monitoring and control

• Remote signalling and acknowledgement

Block Diagram

Debounce

Timers

RLED

OpenSw

ClosedSw

Control

Drive

Logic

Debounce

Timers

GLED

Debounce

Timers

Output

Limitter

ELM334DSB

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