© 2002 Microchip Technology Inc.

DS21441B-page 1

TC623

Features

• Integrated Temp Sensor and Detector Operate

from a Supply Voltage as Low as 2.7V

• Replaces Mechanical Thermostats and Switches

• On-Chip Temperature Sense

• 8-Pin DIP or SOIC for Direct PCB Mounting

• 2 User Programmable Temperature Set Points

• 2 Independent Temperature Limit Outputs

• Heat/Cool Regulate Output

Applications

• CPU Thermal Management

• System Over or Under Temperature Shutdown

• Advanced Thermal Warning

• Fan Speed Control Circuits

• Accurate Appliance Temperature Sensing

• Environmental Control

Device Selection Table

Functional Block Diagram

Package Type

General Description

The TC623 is a 3V solid-state, programmable temper-

ature sensor designed for use in thermal management

applications. It features dual thermal interrupt outputs

(LOW LIMIT and HIGH LIMIT) each of which are set

with an external resistor. The HIGH LIMIT and LOW

LIMIT outputs are driven active (high) when measured

temperature equals the user programmed limits. The

CONTROL output is driven active (high) when temper-

ature equals the HIGH LIMIT set point and turned off

when temperature falls below the LOW LIMIT set point.

The CONTROL output can beusedtoprovide simple

ON/OFF control to a cooling fan if so desired.

Low voltage operation, easy set point programming,

small size and low cost make the TC623 an ideal

choice for many thermal management applications.

Part Number

Package

Temp. Range

TC623CCOA

8-Pin SOIC

0°C to +70°C

TC623CCPA

8-Pin PDIP

0°C to +70°C

TC623CEOA

8-Pin SOIC

-40°C to +85°C

TC623CEPA

8-Pin PDIP

-40°C to +85°C

TC623CVOA

8-Pin SOIC

-40°C to +125°C

NOTE: Latch Output (C option), is a Standard Device. Con-

tact Factory for Latch Q Output (H option).

3

HIGH SET

2

LOW SET

1

NC

4

GND

5

CONTROL

6

HIGH LIMIT

7

LOW LIMIT

8

Latch

Q

S

R

+

+

–

–

TC623

R

< R

LOW

HIGH

Gen.

Gen.

Temperature

To Voltage

Converter

GND

HIGH SET

PDIP

SOIC

NC

GND

HIGH SET

LOW SET

LOW SET

NC

HIGH LIMIT

CONTROL

LOW LIMIT

HIGH LIMIT

CONTROL

LOW LIMIT

8

7

6

5

1

2

3

4

1

8

2

7

3

6

4

5

TC623CCOA

TC623CEOA

TC623CVOA

TC623CCPA

TC623CEPA

3V, Dual Trip Point Temperature Sensor