MC623 Datasheet, PDF (1/4 Pages) ON Semiconductor – 3V, Dual Trip Point Temperature Sensor

MC623
3V, Dual Trip Point
Temperature Sensor
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.
Low voltage operation, easy setpoint programming, small size and
low cost make the MC623 an ideal choice for many thermal
management applications.
Features
• Integrated Temperature Sensor and Detector Operate from a Supply
Voltage as Low as 2.7V
• Replaces Mechanical Thermostats and Switches
• On–Chip Temperature Sense
• 8–Pin SOIC for Direct PCB Mounting
• 2 User–Programmable Temperature Set Points
• 2 Independent Temperature Limit Outputs
• Heat/Cool Regulate Output
• Operating Temperature Range: –40°C to +85°C
Typical Applications
• CPU Thermal Management
• System Over–or Under–Temperature Shutdown
• Advanced Thermal Warning
• Fan Speed Control Circuits
• Accurate Appliance Temperature Sensing
• Environmental Control
FUNCTIONAL BLOCK DIAGRAM
NC
1
LOW
SET 2
Temp to
Voltage
Converter
Vref Gen.
MC623
+
–
8 ^VCC
LOW
7 LIMIT
http://onsemi.com
SO–8
D SUFFIX
CASE TBD
PRELIMINARY INFORMATION
PIN CONFIGURATION
(Top View)
NC 1
8 VCC
LOW SET 2
7 LOW LIMIT
MC623D
HIGH SET 3
6 _{HIGH LIMIT}
GND 4
5 CONTROL
ORDERING INFORMATION
Device
Package
Shipping
MC623DR2
8–Pin SOIC 2500 Tape/Reel
Vref
HIGH
SET 3
GND
4
+
Vref Gen.
–
RLOW < RHIGH
RS
Q
Latch
HIGH
6 _LIMIT
5 ^CONTROL
© Semiconductor Components Industries, LLC, 1999
1
February, 2000 – Rev. 0
Publication Order Number:
MC623/D