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MC623
3.0 V, Dual Trip Point
Temperature Sensor
The MC623 is a 3.0 V 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 2.7 V
• 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
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SO-8
D SUFFIX
PRELIMINARY INFORMATION
LOW SET
HIGH SET
CASE TBD
PIN CONFIGURATION
NC
GND
1
2
MC623D
3
4
(Top View)
8
7
6
5
V
CC
LOW LIMIT
HIGH LIMIT
CONTROL
T ypical Applications
• CPU Thermal Management
• System Over-or Under-Temperature Shutdown
• Advanced Thermal Warning
• Fan Speed Control Circuits
• Accurate Appliance Temperature Sensing
• Environmental Control
ORDERING INFORMATION
Device Package Shipping
MC623DR2 8-Pin SOIC 2500 Tape/Reel
Semiconductor Components Industries, LLC, 2003
February, 2003 - Rev. 3
1 Publication Order Number:
MC623/D
FUNCTIONAL BLOCK DIAGRAM
MC623
NC
LOW
SET
HIGH
SET
1
2
3
Voltage
Converter
V
Gen.
ref
V
ref
V
Gen.
ref
+
−
+
−
MC623
V
CC
8
LOW
7
LIMIT
HIGH
6
LIMIT
RS
Temp to
GND
Q
4
R
LOW
< R
HIGH
Latch
5
CONTROL
MAXIMUM RATINGS*
Rating Value Unit
Package Power Dissipation (TA ≤ 70°C) 470 mW
Derating Factors 6.0 mW/°C
Supply Voltage 5.5 V
Input Voltage, Any Input (GND - 0.3) to (VDD + 0.3) V
Operating Temperature Range -40 to +125 °C
Maximum Chip Temperature 150 °C
Storage Temperature Range -65 to +150 °C
Lead Temperature (Soldering, 10 Seconds) +300 °C
* Maximum Ratings are those values beyond which damage to the device may occur.
ELECTRICAL CHARACTERISTICS (Over Operating Temperature Range, V
Characteristic Symbol Min Typ
Supply Voltage Range V
Supply Current (2.7V ≤ VDD ≤ 4.5V) I
= 2.7V to 4.5V, unless otherwise noted.)
DD
DD
DD
2.7 - 4.5 V
- 150 250 µA
1
Max Unit
Absolute Accuracy
T = Programmed Temperature
IOH = 250µA
= 500µA
I
OH
IOL = 500µA
I
= 1.0mA
OL
V
OH
V
OL
T-3 T±1 T+3
0.9 x V
0.8 x V
-
-
DD
DD
-
-
-
-
-
-
0.1 x V
0.2 x V
DD
DD
Hysteresis (Falling Temperature) HYST - - -2.0 °C
1. Measured at 25°C.
°C
V
V
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2
MC623
DETAILED DESCRIPTION
MC623 Operation
The MC623 consists of a positive temperature coefficient
(PTC) temperature sensor and dual threshold detector.
Temperature set point programming is easily accomplished
with external programming resistors from the HIGH SET
and LOW SET inputs to V
. The HIGH LIMIT and LOW
CC
LIMIT outputs remain inactive (low) as long as the
measured temperature is below setpoint values. As
temperature increases, the LOW LIMIT is driven high when
temperature exceeds the LOW LIMIT setpoint (±3°C). If
temperature continues to climb, the HIGH LIMIT output is
driven high when temperature exceeds the HIGH LIMIT
setpoint (±3°C). Figure 1 shows the relationship between the
sense resistance values and trip point temperature.
250
200
150
RESISTANCE (k )
100
To prevent output ”chattering” when measured
temperature is a t (or near) the programmed trip point values,
the LOW SET and HIGH SET inputs each have a built-in
hysteresis of - 2°C max. As a result, the HIGH LIMIT and
LOW LIMIT outputs remain active until the measured
temperature falls a maximum of 2°C below the programmed
HIGH SET and LOW SET thresholds as shown in Figure 3.
The programmed setting threshold of Figure 3 is
user-programmed temperature trip points of either the
LOW SET or HIGH SET inputs. The LOW LIMIT or HIGH
LIMIT output is driven active when temperature equals the
programmed setpoint value (to within 3°C). The output
remains active until the temperature falls an additional 2°C
below the setpoint due to hysteresis.
Programmed
Setpoint
-2 °C Hysteresis
High Limit or
Low Limit Output
50
5 105
TEMPERATURE (°C)
Figure 1. MC623 Sense Resistors vs. Trip
Temperature
12585654525-15-35-55
The CONTROL output is driven high when the HIGH
LIMIT output goes high, and is reset low when the LOW
LIMIT output goes low. This output provides the logic for
simple ON/OFF fan control. Figure 2 shows overall MC623
operation.
High Set Point
Low Set Point
Low Limit Output
High Limit Output
Control Output
(Cool Option)
Figure 2. MC623 Temperature vs. Output
Temperature
Figure 3. High Set and Low Set Thresholds
APPLICATIONS
Mounting
If the MC623 is used to measure the temperature of
another device, it is important that the top surface of the
MC623 package be in intimate contact with the measured
device. Good thermal conductivity and no air space is
critical to accurate temperature measurement in applications
of this type.
Trip Point Programming
The resistance values required for the HIGH SET and
LOW SET inputs are calculated using the formula below:
R
= 0.5997 x T
TRIP
2.1312
Where Rtrip = Programming resistor value in Ohms
T = Desired trip temperature in degrees Kelvin.
For example, to program a trip point of 50°C, the
programming resistor is:
R
= 0.5997 x (50 + 273.15)
TRIP
2.1312
) = 133,652
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3
MC623
PACKAGE DIMENSIONS
8-Pin SOIC
PLASTIC PACKAGE
CASE TBD
ISSUE TBD
PIN 1 indicated by dot and/or beveled edge
.050 (1.27) TYP.
.197 (5.00)
.189 (4.80)
.018 (0.46)
.014 (0.36)
.157 (3.99)
.150 (3.81)
.010 (0.25)
.004 (0.10)
.244 (6.20)
.228 (5.79)
.069 (1.75)
.053 (1.35)
8 MAX.
.050 (1.27)
.016 (0.40)
.010 (0.25)
.007 (0.18)
Dimensions: inches (mm)
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4
MC623
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make
changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all
liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death
may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada
Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada
Email: ONlit@hibbertco.com
N. American Technical Support: 800-282-9855 Toll Free USA/Canada
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JAPAN: ON Semiconductor, Japan Customer Focus Center
2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051
Phone: 81-3-5773-3850
ON Semiconductor Website: http://onsemi.com
For additional information, please contact your local
Sales Representative.
MC623/D
5
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