MC642.REV3 [ONSEMI]
3.0 V, Dual Trip Point Temperature Sensor; 3.0 V，双跳变点温度传感器
| 型号： | MC642.REV3 |
| 厂家： | 
ONSEMI |
| 描述： | 3.0 V, Dual Trip Point Temperature Sensor |
| 文件： | 总5页 (文件大小：69K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
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SO-8
D SUFFIX
CASE TBD
PRELIMINARY INFORMATION
Features
• Integrated Temperature Sensor and Detector Operate from a Supply
Voltage as Low as 2.7 V
PIN CONFIGURATION
• Replaces Mechanical Thermostats and Switches
• 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
(Top View)
• 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
ORDERING INFORMATION
Device
MC623DR2
Package
Shipping
2500 Tape/Reel
8-Pin SOIC
Semiconductor Components Industries, LLC, 2003
1
Publication Order Number:
February, 2003 - Rev. 3
MC623/D
MC623
FUNCTIONAL BLOCK DIAGRAM
Temp to
Voltage
Converter
NC
MC623
V
1
2
CC
8
7
+
−
LOW
LIMIT
LOW
SET
V
Gen.
Gen.
ref
V
ref
+
−
HIGH
LIMIT
HIGH
SET
V
ref
6
5
3
4
R
S
GND
Q
CONTROL
Latch
R
< R
HIGH
LOW
MAXIMUM RATINGS*
Rating
Value
470
6.0
Unit
mW
mW/°C
V
Package Power Dissipation (T ≤ 70°C)
A
Derating Factors
Supply Voltage
5.5
DD
Input Voltage, Any Input
(GND - 0.3) to (V + 0.3)
V
Operating Temperature Range
Maximum Chip Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 Seconds)
-40 to +125
150
°C
°C
-65 to +150
+300
°C
°C
* Maximum Ratings are those values beyond which damage to the device may occur.
ELECTRICAL CHARACTERISTICS (Over Operating Temperature Range, V = 2.7V to 4.5V, unless otherwise noted.)
DD
1
Characteristic
Symbol
Min
2.7
-
Typ
-
Max
4.5
Unit
Supply Voltage Range
V
V
DD
DD
Supply Current (2.7V ≤ V ≤ 4.5V)
I
150
250
µA
°C
DD
Absolute Accuracy
T-3
T±1
T+3
T = Programmed Temperature
I
I
= 250µA
= 500µA
V
0.9 x V
0.8 x V
-
-
-
-
V
V
OH
OH
OH
DD
DD
I
OL
I
OL
= 500µA
= 1.0mA
V
-
-
-
-
0.1 x V
0.2 x V
OL
DD
DD
Hysteresis (Falling Temperature)
HYST
-
-
-2.0
°C
1. Measured at 25°C.
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2
MC623
DETAILED DESCRIPTION
MC623 Operation
To prevent output ”chattering” when measured
temperature is at (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.
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 VCC. The HIGH LIMIT and LOW
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
Programmed
Setpoint
-2 °C Hysteresis
High Limit or
Low Limit Output
100
50
Figure 3. High Set and Low Set Thresholds
-55 -35 -15
5
25
45
65
85 105 125
APPLICATIONS
Mounting
TEMPERATURE (°C)
Figure 1. MC623 Sense Resistors vs. Trip
Temperature
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.
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.
Trip Point Programming
High Set Point
The resistance values required for the HIGH SET and
LOW SET inputs are calculated using the formula below:
Temperature
Low Set Point
RTRIP = 0.5997 x T 2.1312
Low Limit Output
High Limit Output
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:
Control Output
(Cool Option)
RTRIP = 0.5997 x (50 + 273.15)2.1312) = 133,652 W
Figure 2. MC623 Temperature vs. Output
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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
.244 (6.20)
.228 (5.79)
.157 (3.99)
.150 (3.81)
.050 (1.27) TYP.
.197 (5.00)
.189 (4.80)
.069 (1.75)
.053 (1.35)
.010 (0.25)
.007 (0.18)
_
8
MAX.
.010 (0.25)
.004 (0.10)
.050 (1.27)
.016 (0.40)
.018 (0.46)
.014 (0.36)
Dimensions: inches (mm)
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4
MC623
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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
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may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC
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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
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PUBLICATION ORDERING INFORMATION
Literature Fulfillment:
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Sales Representative.
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MC623/D
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