The MC623 is a 3V solid–state, programmable temperature sensor
designed for use in thermal management applications. It features dual
thermal interrupt outputs (LOW LIMIT and HIGH LIMIT) each of
which program with a single external resistor. The HIGH LIMIT and
LOW LIMIT outputs are driven active (high) when measured
temperature exceeds the user–programmed limits. The CONTROL
output is driven active (high) when temperature exceeds the HIGH
LIMIT setpoint, and turned off when temperature falls below the
LOW LIMIT setpoint. The CONTROL output can be used to provide
simple ON/OFF control to a cooling fan if so desired.
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D SUFFIX
CASE TBD
Low voltage operation, easy setpoint programming, small size and
low cost make the MC623 an ideal choice for many thermal
management applications.
PRELIMINARY INFORMATION
Features
• Integrated Temperature Sensor and Detector Operate from a Supply
Voltage as Low as 2.7V
PIN CONFIGURATION
• Replaces Mechanical Thermostats and Switches
(Top View)
• On–Chip Temperature Sense
V
8
7
6
5
NC
LOW SET
HIGH SET
GND
1
2
3
4
CC
• 8–Pin SOIC for Direct PCB Mounting
• 2 User–Programmable Temperature Set Points
• 2 Independent Temperature Limit Outputs
• Heat/Cool Regulate Output
LOW LIMIT
HIGH LIMIT
CONTROL
MC623D
• Operating Temperature Range: –40°C to +85°C
Typical Applications
• CPU Thermal Management
• System Over–or Under–Temperature Shutdown
• Advanced Thermal Warning
ORDERING INFORMATION
• Fan Speed Control Circuits
• Accurate Appliance Temperature Sensing
• Environmental Control
Device
MC623DR2
Package
Shipping
2500 Tape/Reel
8–Pin SOIC
FUNCTIONAL BLOCK DIAGRAM
Temp to
NC
Voltage
MC623
V
1
CC
8
7
Converter
+
–
LOW
LIMIT
LOW
SET
V
ref
Gen.
2
V
ref
+
–
HIGH
LIMIT
HIGH
SET
V
Gen.
6
5
ref
3
4
R
S
GND
Q
CONTROL
Latch
R
< R
HIGH
LOW
Semiconductor Components Industries, LLC, 1999
1
Publication Order Number:
February, 2000 – Rev. 0
MC623/D