Datasheet > ELM331

ELM331

更新时间： 2024-01-26 18:26:38

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
4页	32K
描述
Solid State Thermostat

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ELM331 数据手册

ELM331

Solid State Thermostat

Description

Features

The ELM331 is

measurement and control system in an 8 pin

package.

complete temperature

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

• Wide supply range - 3.0 to 5.5 volt operation

• Built-in proportional hysteresis

This integrated circuit is designed to compare

two resistances and drive an output pin depending

on the relative value of each. Typically, one of the

resistors will be an NTC thermistor, and the other

one will be a temperature independent resistor

(whether fixed or variable). When the magnitude of

the resistance connected to pin 2 exceeds the value

of the resistance connected to pin 3, the output pin

will be driven to a high state. Hysteresis maintains

the output in that state until the relative values differ

by approximately 8% (or typically 2°C for a 10KW

thermistor).

• Measurement in progress output

• Time delay on operate improves noise immunity

• Internal pullup resistor on the reset input

• High current drive outputs - up to 25 mA

Connection Diagram

PDIP and SOIC

(top view)

To reduce the possibility of sporadic outputs, a

condition must exist for three successive cycles, or 6

seconds, before the output pin can change state.

VDD

VSS

Out

MIP

Cap

Applications

• Primary thermostat in temperature control

systems

reset

• Staging control for auxiliary heating or cooling

installations

• Under or over temperature alarms

Block Diagram

VDD

Watchdog

Timer

Control

reset

Measurement in Progress (busy)

MIP

Out

Overrange

Analog to

Digital

Converter

R1 > R2

3 Consecutive

Measurements

ELM331DSB

Elm Electronics – Circuits for the Hobbyist

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