2002 Microchip Technology Inc. DS21439B-page 1
TC620/TC621
Features
• User Programmable Hysteresis and
Temperature Set Point
• Easily Programs with 2 External Resistors
• 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)
• Onboard Temperature Sensing Applications
(TC620X)
• External NTC Thermistor for Remote Sensing
Applications (TC621X)
• Availablein8-PinPDIPandSOICPackages
Applications
• Power Supply Over Temperature Detection
• Consumer Equipment
• Temperature Regulators
• CPU Thermal Protection
Device Selection Table
NOTE: *The part code will be C or H.
(See Functional Block Diagrams).
Package Type
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.
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 drivenhigh whentem-
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.
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.
Part Number Package Temperature
Range
TC620X*COA 8-Pin SOIC 0°C to +70°C
TC620X*CPA 8-Pin PDIP 0°C to +70°C
TC620X*EOA 8-Pin SOIC -40°C to +85°C
TC620X*EPA 8-Pin PDIP -40°C to +85°C
TC620C*VOA 8-Pin SOIC -40°C to +125°C
TC621X*COA 8-Pin SOIC 0°C to +70°C
TC621X*CPA 8-Pin PDIP 0°C to +70°C
TC621X*EOA 8-Pin SOIC -40°C to +85°C
TC621X*EPA 8-Pin PDIP -40°C to +85°C
T
HERMISTOR
8-SOIC
8-SOIC
VDD
GND
LOW LIMIT
CONTROL
NC
LOW SET
HIGH SET HIGH LIMIT
VDD
GND
LOW LIMIT
CONTROL
LOW SET
HIGH SET HIGH LIMIT
8
7
6
5
1
2
3
4
TC621XCOA
TC621XEOA
8
7
6
5
1
2
3
4
TC620XCOA
TC620XEOA
TC620CVOA
THERMISTOR
8-PDIP
VDD
GND
LOW LIMIT
CONTROL
LOW SET
HIGH SET HIGH LIMIT
8
7
6
5
1
2
3
4
TC621XCPA
TC621XEPA
NC
8-PDIP
VDD
GND
LOW LIMIT
CONTROL
HIGH SET
LOW SET HIGH LIMIT
8
7
6
5
1
2
3
4
TC620XCPA
TC620XEPA
5V, Dual Trip Point Temperature Sensors
TC620/TC621
DS21439B-page 2
2002 Microchip Technology Inc.
Functional Block Diagrams
3
HIGH SET
2
LOW SET
5
CONTROL*
6
HIGH LIMIT
VDD
7
LOW LIMIT
8
4
*Suffix code "C" denotes cooling option (High true CONTROL output).
Suffix code "H" denotes heatin
g
o
p
tion
(
Low true CONTROL out
p
ut
)
.
Q
S
R
Q
+
+
–
–
TC620
HIGH SET
LOW SET
1
THERMISTOR
CONTROL*
HIGH LIMIT
LOW LIMIT
Temp. to
Voltage
Converter
VREF
GEN
VREF
GEN
VREF
3
2
5
6
VDD
7
8
4
Q
S
R
Q
+
+
–
–
TC621
Thermistor
Interface
Circuit
VREF
GEN
VREF
GEN
VREF
2002 Microchip Technology Inc. DS21439B-page 3
TC620/TC621
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage.......................................................20V
Input Voltage Any Input..(GND – 0.3V) to (VDD +0.3V)
Package Power Dissipation (TA≤70°C)
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
*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.
TC620/TC621 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA= 25°C, unless otherwise specified.
Symbol Parameter Min Typ Max Unit Test Conditions
VDD Supply Voltage Range 4.5 — 18 V
IDD Supply Current — 270 400 µA5V≤VDD ≤18V
ROUT Output Resistance — 400 1000 W Output High or Low, 5V ≤VDD ≤18V
IOUT Output Current — — 1 mA Temp Sensed Source/Sink
IOUT Output Current — — 1 mA Cool/Heat Source/Sink
TERR Absolute Accuracy T - 3 T T + 3 °C T = Programmed Temperature
TC620/TC621
DS21439B-page 4
2002 Microchip Technology Inc.
2.0 PIN DESCRIPTIONS
ThedescriptionsofthepinsarelistedinTable2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
(8-Pin PDIP)
(8-Pin SOIC)
0°C to +70°C
-40°C to +85°C
-40°C to +125°C
Symbol Description
1 NC No Internal Connection.
2 LOW SET Low temperature set point. Connect an external 1% resistor from LOW SET to VDD
to set trip point.
3 HIGH SET High temperature set point. Connect an external 1% resistor from HIGH SET to
VDD to set trip point.
4 GND Ground Terminal.
5 CONTROL Control output.
6 HIGH LIMIT High temperature push/pull output.
7 LOW LIMIT Low temperature push/pull output.
8V
DD Power supply input.
Pin No.
(8-Pin PDIP)
(8-Pin SOIC)
0°C to +70°C
-40°C to +85°C
Symbol Description
1 THERMISTOR Thermistor input.
2 HIGH SET High temperature set point. Connect an external 1% resistor from HIGH SET to
VDD to set trip point.
3 LOW SET Low temperature set point. Connect an external 1% resistor from LOW SET to
VDD to set trip point.
4 GND Ground Terminal.
5 CONTROL Control output.
6LOW
LIMIT Low temperature push/pull output.
7HIGH
LIMIT High temperature push/pull output.
8V
DD Power supply input.
2002 Microchip Technology Inc. DS21439B-page 5
TC620/TC621
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
inputs to VDD. The HIGH LIMIT and LOW LIMIT outputs
remain low as long as measured temperature is below
set point values. As measured temperature increases,
the LOW LIMIT outputis driven high whentemperature
equals the LOW SET set point (±3°C max). If tempera-
ture continues to climb, the HIGH LIMIT output isdriven
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 3-1: TC620/TC621 INPUT VS.
OUTPUT LOGIC
3.1 Programming the TC620
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:
For example, a 50°C setting on either the HIGH SET
or LOW SET input is calculated using Equation 3-2 as
follows:
EQUATION 3-2:
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.
Care must also be taken to ensure the LOW SET
temperature setting is atleast5°C lower than the HIGH
SET temperature setting.
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.
FIGURE 3-2: TC620 SENSE
RESISTORS VS. TRIP
TEMPERATURE
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).
FIGURE 3-3: BUILT-IN HYSTERESISON
LOW LIMIT AND HIGH
LIMIT OUTPUTS
As shown, the outputs remain in their active state
(hysteresis) until temperature falls an additional 2°C
below the user's setting.
Low Set Point
High Set Point
Low Limit Output
High Limit Output
Control Output (Cool Option
Control Output (Heat Option)
Temperature
RTRIP = 0.5997 x T 2.1312
Where:
RTRIP = Programming resistor in Ohms
T = The desired trip point temperature in degrees
Kelvin.
RSET = 0.5997 x ((50 + 273.15)2.1312) = 133.6kΩ
TEMPERATURE (˚C)
RESISTANCE, RTRIP (kΩ)
-55 -35 -15 5 25 45 65 85 105 125
50
100
150
200
250
Set Point
(Set Point 2˚C)
High Limit
or Low Limit
Output
TC620/TC621
DS21439B-page 6
2002 Microchip Technology Inc.
3.3 Using the TC621
The TC621 operation is similar to thatof 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.
3.4 TC621 Thermistor Selection
The TC621 uses an external thermistor to monitor the
controlling temperature. A thermistor with a resistance
value of approximately 100kΩat 25°C is
recommended.
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
thedatashowninFigure3-4,a30kΩresistor between
HIGH TEMP (Pin 2) and VDD (Pin 8) sets the high
temperature trip point at +51°C and a 49kΩresistor on
LOW TEMP (Pin 3) sets the low temperature trip point
to +41°C.
FIGURE 3-4: TYPICAL NTC
THERMISTOR
3.5 TC620/TC621 Outputs
Both devices have complimentary output stages. They
are rated at a source or sink current of 1mA maximum.
01020304050
100
70
TEMPERATURE
(
˚C
)
0
50
60
150
200
250
300
350
THERMISTOR RESISTANCE (kΩ)
2002 Microchip Technology Inc. DS21439B-page 7
TC620/TC621
4.0 TYPICAL APPLICATIONS
4.1 Dual Speed Temperature Control
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
monitorthe 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.
4.2 Temperature Controlled Fan
In the application in Figure 4-2, a high and a low tem-
perature is selected by two RLand RH. The TC620
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.
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
FIGURE 4-2: TEMPERATURE CONTROLLED FAN
TC620
2
3
1
5
6
7
+12V VMOTOR
MOSFET
Fan Motor
50Ω
Higher Power Option
1N4148
1N4148
8
4
TC4469
2
1
3
5
8
13
4
6
9
10
11
12
14
1M
10k
100k
High
Limit
Low
Limit
Fan Motor
50pF
Temperature Scale
7
Low Temp
30 C
˚
High Temp.
50 C
˚
10µF0.1µF
– 30 C (Fan Off)
– 50 C (Fan Low)
– UP (Fan High)
˚
˚1µF
0 C
30 C
50 C
˚
˚
˚
TC620
High Temp.
1
2
3
4
8
7
6
5
Low Temp.
+12V
MTP3055E
Fan Motor
TC621
High
Temp.
1
2
3
4
8
7
6
5
Low Temp.
+12V
MTP3055E
Fan Motor
Thermistor
(NTC)
R
L
R
L
R
H
R
H
TC620/TC621
DS21439B-page 8
2002 Microchip Technology Inc.
FIGURE 4-3: HEATING AND COOLING APPLICATION
TC620
1
2
3
4
8
7
6
5TC4469
1
2
3
4
5
6
7
14
13
12
11
10
9
8
High
Temp.
Warning
Heating/Cooling
Equipment
1k
1k
Low
Temp.
Warning
4.5V to 18V
High
Temp.
Low
Temp.
2002 Microchip Technology Inc. DS21439B-page 9
TC620/TC621
5.0 PACKAGING INFORMATION
5.1 Package Marking Information
Package marking data not available at this time.
5.2 Taping Form
5.3 Package Dimensions
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
8-Pin SOIC (N) 12 mm 8 mm 2500 13 in
Carrier Tape, Number of Components Per Reel and Reel Size
Standard Reel Component Orientation
for TR Suffix Device
PIN 1
User Direction of Feed
P
W
3
°
MIN.
PIN 1
.260
(
6.60
)
.240
(
6.10
)
.045
(
1.14
)
.030
(
0.76
)
.070
(
1.78
)
.040
(
1.02
)
.400
10.16
.348
(
8.84
)
.200
(
5.08
)
.140
(
3.56
)
.150
(
3.81
)
.115
(
2.92
)
.110
(
2.79
)
.090
(
2.29
)
.022
(
0.56
)
.015
(
0.38
)
.040
(
1.02
)
.020
(
0.51
)
.015
(
0.38
)
.008
(
0.20
)
.310
(
7.87
)
.290
(
7.37
)
.400
(
10.16
)
.310
(
7.87
)
8
-P
i
n Plast
i
c DI
P
Dimensions: inches (mm)
TC620/TC621
DS21439B-page 10
2002 Microchip Technology Inc.
Package Dimensions (Continued)
.050
(
1.27
)
TYP
.
8
°
MAX.
PIN 1
.244
(
6.20
)
.228
(
5.79
)
.157
(
3.99
)
.150
(
3.81
)
.197
(
5.00
)
.189
(
4.80
)
.020
(
0.51
)
.013
(
0.33
)
.010
(
0.25
)
.004
(
0.10
)
.069
(
1.75
)
.053
(
1.35
)
.010
(
0.25
)
.007
(
0.18
)
.050
(
1.27
)
.016
(
0.40
)
.
8
-Pin
SO
I
C
Dimensions: inches (mm)
2002 Microchip Technology Inc. DS21439B-page 11
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.
TC620/TC621
DS21439B-page 12
2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc. DS21439B-page 13
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-
nologyIncorporated 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 trademarksof 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
certification for its worldwide headquarters,
design and wafer fabrication facilities in
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
PICmicro®8-bit MCUs, KEELOQ®code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
DS21439B-page 14
2002 Microchip Technology Inc.
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Milan, Italy
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
03/01/02
WORLDWIDE SALES AND SERVICE
*DS21439B*