TC621XCOA [MICROCHIP]
5V, Dual Trip Point Temperature Sensors; 5V ，双跳变点温度传感器
| 型号： | TC621XCOA |
| 厂家： | 
MICROCHIP |
| 描述： | 5V, Dual Trip Point Temperature Sensors |
| 文件： | 总14页 (文件大小：451K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC620/TC621
5V, Dual Trip Point Temperature Sensors
Features
Package Type
8-PDIP
• User Programmable Hysteresis and
Temperature Set Point
NC
V
1
2
3
4
8
DD
• Easily Programs with 2 External Resistors
HIGH LIMIT
LOW SET
HIGH SET
GND
7
6
5
TC620XCPA
TC620XEPA
• Wide Temperature Detection Range:
-0°C to 70°C: (TC620/TC621CCX)
-40°C to +125°C: (TC620/TC621CVX)
-40°C to +85°C: (TC620/TC621CEX)
-55°C to +125°C: (TC620/TC621CMX)
LOW LIMIT
CONTROL
8-PDIP
THERMISTOR
V
1
8
DD
• Onboard Temperature Sensing Applications
(TC620X)
HIGH LIMIT
2
3
4
HIGH SET
LOW SET
GND
7
6
5
TC621XCPA
TC621XEPA
LOW LIMIT
CONTROL
• External NTC Thermistor for Remote Sensing
Applications (TC621X)
• Available in 8-Pin PDIP and SOIC Packages
8-SOIC
V
NC
LOW SET
HIGH SET
GND
1
2
3
4
8
7
6
5
DD
Applications
LOW LIMIT
HIGH LIMIT
TC620XCOA
TC620XEOA
TC620CVOA
• Power Supply Over Temperature Detection
• Consumer Equipment
CONTROL
• Temperature Regulators
8-SOIC
• CPU Thermal Protection
THERMISTOR
V
1
2
3
4
8
DD
HIGH LIMIT
Device Selection Table
HIGH SET
LOW SET
GND
7
6
5
TC621XCOA
TC621XEOA
LOW LIMIT
CONTROL
Temperature
Range
Part Number
Package
TC620X*COA
TC620X*CPA
TC620X*EOA
TC620X*EPA
TC620C*VOA
TC621X*COA
TC621X*CPA
TC621X*EOA
TC621X*EPA
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
0°C to +70°C
0°C to +70°C
General Description
The TC620 and TC621 are programmable logic output
temperature detectors designed for use in thermal
management applications. The TC620 features an
onboard temperature sensor, while the TC621
connects to an external NTC thermistor for remote
sensing applications.
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
0°C to +70°C
0°C to +70°C
Both devices feature dual thermal interrupt outputs
(HIGH LIMIT and LOW LIMIT), each of which is pro-
grammed with a single external resistor. On the TC620,
these outputs are driven active (high) when measured
temperature equals the user programmed limits. The
CONTROL (hysteresis) output is driven high when tem-
perature equals the high limit setting and returns low
when temperature falls below the low limit setting. This
output can be used to provide ON/OFF control to a
cooling fan or heater. The TC621 provides the same
output functions except that the logical states are
inverted.
-40°C to +85°C
-40°C to +85°C
NOTE: *The part code will be C or H.
(See Functional Block Diagrams).
The TC620/TC621 are usable over operating
temperature ranges of 0°C to 70°C, -40°C to +125°C
and -55°C to 125°C.
2002 Microchip Technology Inc.
DS21439B-page 1
TC620/TC621
Functional Block Diagrams
V
DD
8
4
Temp. to
Voltage
Converter
TC620
+
–
7
LOW LIMIT
2
V
REF
GEN
LOW SET
V
REF
+
–
6
5
HIGH LIMIT
CONTROL*
3
V
GEN
REF
HIGH SET
R
Q
S
Q
V
DD
8
Thermistor
Interface
Circuit
1
THERMISTOR
4
7
TC621
+
HIGH LIMIT
2
V
REF
GEN
HIGH SET
–
V
REF
+
–
6
5
LOW LIMIT
CONTROL*
3
V
REF
GEN
LOW SET
R
Q
S
Q
*Suffix code "C" denotes cooling option (High true CONTROL output).
Suffix code "H" denotes heating option (Low true CONTROL output).
DS21439B-page 2
2002 Microchip Technology Inc.
TC620/TC621
1.0
ELECTRICAL
CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
Absolute Maximum Ratings*
Supply Voltage ....................................................... 20V
Input Voltage Any Input.. (GND – 0.3V) to (V +0.3V)
DD
Package Power Dissipation (T ≤ 70°C)
A
PDIP ..............................................730mW
SOIC ..............................................470mW
Derating Factors:
Plastic ........................................... 8mW/°C
Operating Temperature:
M Version......................... -55°C to +125°C
V Version ......................... -40°C to +125°C
E Version ........................... -40°C to +85°C
C Version .............................. 0°C to +70°C
Storage Temperature ......................... -65°C to +150°C
TC620/TC621 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = 25°C, unless otherwise specified.
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
VDD
IDD
Supply Voltage Range
Supply Current
4.5
—
—
270
400
—
18
400
1000
1
V
µA
W
5V ≤ VDD ≤ 18V
Output High or Low, 5V ≤ VDD ≤ 18V
ROUT
IOUT
IOUT
TERR
Output Resistance
Output Current
—
—
mA
mA
°C
Temp Sensed
Cool/Heat
Source/Sink
Source/Sink
Output Current
—
—
1
Absolute Accuracy
T - 3
T
T + 3
T = Programmed Temperature
2002 Microchip Technology Inc.
DS21439B-page 3
TC620/TC621
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Symbol
Pin No.
(8-Pin PDIP)
(8-Pin SOIC)
0°C to +70°C
-40°C to +85°C
-40°C to +125°C
Description
1
2
NC
No Internal Connection.
LOW SET
Low temperature set point. Connect an external 1% resistor from LOW SET to V
to set trip point.
DD
3
HIGH SET High temperature set point. Connect an external 1% resistor from HIGH SET to
to set trip point.
V
DD
4
5
6
7
8
GND
Ground Terminal.
CONTROL Control output.
HIGH LIMIT High temperature push/pull output.
LOW LIMIT Low temperature push/pull output.
V
Power supply input.
DD
Pin No.
(8-Pin PDIP)
(8-Pin SOIC)
0°C to +70°C
-40°C to +85°C
Symbol
Description
1
2
THERMISTOR Thermistor input.
HIGH SET
High temperature set point. Connect an external 1% resistor from HIGH SET to
to set trip point.
V
DD
3
LOW SET
Low temperature set point. Connect an external 1% resistor from LOW SET to
to set trip point.
V
DD
4
5
6
7
8
GND
Ground Terminal.
CONTROL
LOW LIMIT
HIGH LIMIT
Control output.
Low temperature push/pull output.
High temperature push/pull output.
Power supply input.
V
DD
DS21439B-page 4
2002 Microchip Technology Inc.
TC620/TC621
Care must also be taken to ensure the LOW SET
temperature setting is at least 5°C lower than the HIGH
SET temperature setting.
3.0
DETAILED DESCRIPTION
The TC620 has a positive temperature coefficient tem-
perature sensor and a dual threshold detector. Temper-
ature set point programming is accomplished with
external resistors from the HIGH SET and LOW SET
Figure 3-2 can help the user obtain an estimate of the
external resistor values required for the desired LOW
SET and HIGH SET trip points.
inputs to V
The HIGH LIMIT and LOW LIMIT outputs
DD.
remain low as long as measured temperature is below
set point values. As measured temperature increases,
the LOW LIMIT output is driven high when temperature
equals the LOW SET set point (±3°C max). If tempera-
ture continues to climb, the HIGH LIMIT output is driven
high when temperature equals the HIGH SET set point
(Figure 3-1). The CONTROL (hysteresis) output is
latched in its active state at the temperature specified
by the HIGH SET resistor. CONTROL is maintained
active until temperature falls to the value specified by
the LOW SET resistor.
FIGURE 3-2:
TC620 SENSE
RESISTORS VS. TRIP
TEMPERATURE
250
200
150
100
50
FIGURE 3-1:
TC620/TC621 INPUT VS.
OUTPUT LOGIC
-55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (˚C)
High Set Point
Temperature
Low Set Point
Low Limit Output
High Limit Output
3.2
Built-in Hysteresis
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
built-in hysteresis of -2°C below the programmed
settings (Figure 3-3).
Control Output (Cool Option
Control Output (Heat Option)
3.1
Programming the TC620
FIGURE 3-3:
BUILT-IN HYSTERESIS ON
LOW LIMIT AND HIGH
LIMIT OUTPUTS
The resistor values to achieve the desired trip point
temperatures on HIGH SET and LOW SET are
calculated using Equation 3-1:
EQUATION 3-1:
Set Point
(Set Point 2˚C)
2.1312
R
= 0.5997 x T
TRIP
Where:
R
= Programming resistor in Ohms
TRIP
High Limit
or Low Limit
Output
T = The desired trip point temperature in degrees
Kelvin.
For example, a 50°C setting on either the HIGH SET
or LOW SET input is calculated using Equation 3-2 as
follows:
As shown, the outputs remain in their active state
(hysteresis) until temperature falls an additional 2°C
below the user's setting.
EQUATION 3-2:
2.1312
R
= 0.5997 x ((50 + 273.15)
) = 133.6kΩ
SET
Care must be taken to ensure the LOW SET program-
ming resistor is a smaller value than the HIGH SET
programming resistor. Failure to do this will result in
erroneous operation of the CONTROL output.
2002 Microchip Technology Inc.
DS21439B-page 5
TC620/TC621
FIGURE 3-4:
TYPICAL NTC
THERMISTOR
3.3
Using the TC621
The TC621 operation is similar to that of the TC620, but
requires an external NTC thermistor. Use the resis-
tance versus temperature curve of the thermistor to
determine the values of the programming resistors.
Note that the pin numbers for the HIGH SET and LOW
SET programming resistors for the TC621 are reversed
versus that of the TC620 (i.e., the resistor value on
HIGH SET [Pin 2] should always be lower than the one
connected to LOW SET [Pin 3]). Also note that the
outputs of the TC621 are LOW TRUE when used with
an NTC thermistor.
350
300
250
200
150
100
50
0
3.4
TC621 Thermistor Selection
0
10
20
30
40
50
70
60
TEMPERATURE (˚C)
The TC621 uses an external thermistor to monitor the
controlling temperature. A thermistor with a resistance
value of approximately 100kΩ at 25°C is
recommended.
3.5
TC620/TC621 Outputs
Both devices have complimentary output stages. They
are rated at a source or sink current of 1mA maximum.
A temperature set point is selected by picking a resis-
tor whose value is equal to the resistance of the ther-
mistor at the desired temperature. For example, using
the data shown in Figure 3-4, a 30kΩ resistor between
HIGH TEMP (Pin 2) and V
(Pin 8) sets the high
DD
temperature trip point at +51°C and a 49kΩ resistor on
LOW TEMP (Pin 3) sets the low temperature trip point
to +41°C.
DS21439B-page 6
2002 Microchip Technology Inc.
TC620/TC621
4.2
Temperature Controlled Fan
4.0
4.1
TYPICAL APPLICATIONS
In the application in Figure 4-2, a high and a low tem-
perature is selected by two R and R . The TC620
Dual Speed Temperature Control
L
H
monitors the ambient temperature and turns the FET
switch on when the temperature exceeds the HIGH
TEMP set point. The fan remains on until the tempera-
ture decreases to the LOW TEMP set point. This
provides the hysteresis. In this application, the fan
turns on only when required.
In Figure 4-1, the Dual Speed Temperature Control
uses a TC620 and a TC4469 quad driver. Two of the
drivers of the TC4469 are configured in a simple oscil-
lator. When the temperature is below the LOW TEMP
set point, the output of the driver is OFF. When the tem-
perature exceeds the LOW TEMP set point, the
TC4469 gates the oscillator signal to the outputs of the
driver. This square wave signal modulates the remain-
ing outputs and drives the motor at a low speed. If this
speed cannot keep the temperature below the HIGH
TEMP set point, then the driver turns on continuously
which increases the fan speed to high. The TC620 will
monitor the temperature and only allow the fan to oper-
ate when needed and at the required speed to maintain
the desired temperature. A higher power option can be
designed by adding a resistor and a power MOSFET.
The TC621 uses an external thermistor to monitor the
ambient temperature. This adds one part, but allows
more flexibility with the location of the temperature
sensor.
FIGURE 4-1:
DUAL SPEED TEMPERATURE CONTROL
+12V
V
MOTOR
0.1µF
10µF
1M
Fan Motor
8
Low Temp
14
˚
30 C
1N4148
1N4148
100k
13
4
High
Limit
2
3
1
5
6
7
2
1
3
5
8
MOSFET
50Ω
TC620
50pF
6
High Temp.
TC4469
˚
9
50 C
Low
Limit
Higher Power Option
Fan Motor
10
11
12
4
Temperature Scale
˚
˚
0 C – 30 C (Fan Off)
7
1µF
10k
˚
˚
30 C – 50 C (Fan Low)
˚
50 C – UP (Fan High)
FIGURE 4-2:
TEMPERATURE CONTROLLED FAN
+12V
+12V
Thermistor
(NTC)
Fan Motor
8
Fan Motor
MTP3055E
Low Temp.
1
2
3
4
High
Temp.
1
2
3
4
8
7
6
5
R
L
7
TC620
TC621
R
H
6
MTP3055E
Low Temp.
R
H
R
L
5
High Temp.
2002 Microchip Technology Inc.
DS21439B-page 7
TC620/TC621
FIGURE 4-3:
HEATING AND COOLING APPLICATION
4.5V to 18V
High
Temp.
Low
Temp.
1
2
3
4
8
7
6
5
1
2
3
4
5
6
7
14
13
12
11
10
9
1k
1k
TC620
TC4469
High
Low
Temp.
Warning
Temp.
Warning
8
Heating/Cooling
Equipment
DS21439B-page 8
2002 Microchip Technology Inc.
TC620/TC621
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
5.2
Taping Form
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin SOIC (N)
12 mm
8 mm
2500
13 in
5.3
Package Dimensions
8-Pin Plastic DIP
PIN 1
.260 (6.60)
.240 (6.10)
.045 (1.14)
.030 (0.76)
.070 (1.78)
.040 (1.02)
.310 (7.87)
.290 (7.37)
.400 (10.16)
.348 (8.84)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.015 (0.38)
.008 (0.20)
3MIN.
.150 (3.81)
.115 (2.92)
.400 (10.16)
.310 (7.87)
.110 (2.79)
.090 (2.29)
.022 (0.56)
.015 (0.38)
Dimensions: inches (mm)
2002 Microchip Technology Inc.
DS21439B-page 9
TC620/TC621
Package Dimensions (Continued)
8-Pin SOIC
PIN 1
.157 (3.99)
.150 (3.81)
.244 (6.20)
.228 (5.79)
.050 (1.27) TYP.
.197 (5.00)
.189 (4.80)
.069 (1.75)
.053 (1.35)
.010 (0.25)
.007 (0.18)
8
.020 (0.51)
.013 (0.33)
.010 (0.25)
.004 (0.10)
.050 (1.27)
.016 (0.40)
Dimensions: inches (mm)
DS21439B-page 10
2002 Microchip Technology Inc.
TC620/TC621
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21439B-page 11
TC620/TC621
NOTES:
DS21439B-page 12
2002 Microchip Technology Inc.
TC620/TC621
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
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Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
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devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
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design and manufacture of development
systems is ISO 9001 certified.
2002 Microchip Technology Inc.
DS21439B-page 13
WORLDWIDE SALES AND SERVICE
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Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
India
Tel: 39-039-65791-1 Fax: 39-039-6899883
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
03/01/02
DS21439B-page 14
2002 Microchip Technology Inc.
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