TC623
3V, Dual Trip Point Temperature Sensor
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
Package Type
SOIC
NC
LOW SET
HIGH SET
GND
1
2
3
4
8
V
CC
LOW LIMIT
HIGH LIMIT
CONTROL
7
6
5
TC623CCOA
TC623CEOA
TC623CVOA
PDIP
NC
1
2
3
4
8
V
CC
LOW LIMIT
HIGH LIMIT
CONTROL
Applications
•
•
•
•
•
•
CPU Thermal Management
System Over or Under Temperature Shutdown
Advanced Thermal Warning
Fan Speed Control Circuits
Accurate Appliance Temperature Sensing
Environmental Control
LOW SET
HIGH SET
GND
TC623CCPA
TC623CEPA
7
6
5
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 be used to provide 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.
Device Selection Table
Part Number
TC623CCOA
TC623CCPA
TC623CEOA
TC623CEPA
TC623CVOA
Package
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
Temp. Range
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
NOTE:
Latch Output (C option), is a Standard Device. Con-
tact Factory for Latch Q Output (H option).
Functional Block Diagram
NC
1
8
Temperature
To Voltage
Converter
TC623
V
CC
+
LOW SET
2
V
REF
Gen.
–
7
LOW LIMIT
V
REF
+
3
6
HIGH LIMIT
HIGH SET
V
REF
Gen.
–
GND
4
R S
Q
Latch
5
CONTROL
R
LOW
< R
HIGH
2002 Microchip Technology Inc.
DS21441B-page 1
©