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ELM341

Low Power Thermostat

Elm Electronics 

ELM341

Low Power Thermostat

Description

The ELM341 is a complete temperature

measurement and control system in an 8 pin

package. It automatically reverts to a very low power

sleep mode between measurements, making it

suitable for battery operation.

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 10KΩ

thermistor).

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.

Applications

• Backup thermostats

• Under or over temperature alarm circuits

Features

• Low power CMOS design

• Wide supply range - 3.0 to 5.5 volt operation

• Built-in proportional hysteresis

• 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

• Sleep mode reduces power requirements

Connection Diagram

PDIP and SOIC

(top view)

VDD 1

R1 2

R2 3

reset 4

8 VSS

7 Out

6 MIP

5 Cap

Block Diagram

reset 4

2

R1

3

R2

5

VDD

Control

Sleep

Timer

Measurement in Progress (busy)

6 MIP

Overrange

Analog to

Digital

Converter

R1 > R2

3 Consecutive

Measurements

7 Out

ELM341DSB

Elm Electronics – Circuits for the Hobbyist

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