TC623 Datasheet, PDF (1/12 Pages) TelCom Semiconductor, Inc – 3V, DUAL TRIP POINT TEMPERATURE SENSOR

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
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
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).
Functional Block Diagram
1
NC
Temperature
To Voltage
Converter
TC623
8
V_CC
+
LOW SET ²
V_REF
Gen.
–
7
LOW LIMIT
3
HIGH SET
4
GND
V_REF
V_REF
Gen.
+
6
HIGH LIMIT
–
R SQ
5
CONTROL
Latch
R_LOW < R _HIGH
Package Type
SOIC
NC 1
8
LOW SET 2 _TC623CCOA 7
HIGH SET
3
TC623CEOA ₆
TC623CVOA
GND 4
5
V_CC
LOW LIMIT
HIGH LIMIT
CONTROL
PDIP
NC 1
LOW SET 2
HIGH SET ³
GND ⁴
TC623CCPA
TC623CEPA
8 V_CC
7 LOW LIMIT
6 HIGH LIMIT
5 CONTROL
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.
© 2002 Microchip Technology Inc.
DS21441B-page 1