TC621HEOA - MICROCHIP - Datasheet.Directory

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

Applica tio ns (TC62 1X)

• Available in 8-Pin PDIP and SOIC Packages

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 TC62 1 are pro grammable log ic outp ut

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 res istor . 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 tem perature falls bel ow the lo w limit set tin g. 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

THERMISTOR

8-SOIC

VDD

GND

LOW LIMIT

CONTROL

LOW SET

HIGH SET HIGH LIMIT

VDD

GND

LOW LIMIT

CONTROL

LOW SET

HIGH SET HIGH LIMIT

TC621XCOA

TC621XEOA

TC620XCOA

TC620XEOA

TC620CVOA

THERMISTOR

8-PDIP

VDD

GND

LOW LIMIT

CONTROL

LOW SET

HIGH SET HIGH LIMIT

TC621XCPA

TC621XEPA

8-PDIP

VDD

GND

LOW LIMIT

CONTROL

HIGH SET

LOW SET HIGH LIMIT

TC620XCPA

TC620XEPA

5V, Dual Trip Point Temperature Sensors

TC620/TC621

Functional Block Diagrams

HIGH SET

LOW SET

CONTROL*

HIGH LIMIT

VDD

LOW LIMIT

*Suffix code "C" denotes cooling option (High true CONTROL output).

Suffix code "H" denotes heating option (Low true CONTROL output).

–

TC620

HIGH SET

LOW SET

THERMISTOR

CONTROL*

HIGH LIMIT

LOW LIMIT

Temp. to

Voltage

Converter

VREF

GEN

VREF

GEN

VREF

VDD

–

TC621

Thermistor

Interface

Circuit

VREF

GEN

VREF

GEN

VREF

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 .............................................730 mW

SOIC.............................................470 mW

Derating Factors:

Plastic..........................................8 mW/°C

Operati ng Tempe rature:

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 Maxi-

mum Ratings” may cause permanent damage to the

device. These are stress ratings only and functional

operatio n of the devic e at these or an y other con ditions

above those indicated in the operation sections of the

specifications is not implied. Exposure 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 Cu rren t — 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 Sour ce/Sin k

IOUT Output Current — — 1 mA Cool/Heat Source/Sink

TERR Absolute Accuracy T - 3 T T + 3 °C T = Programmed Temperature

TC620/TC621

2.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

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 Inte rnal Con nec tio n.

2 LOW SET Low tempe ratu re set po int. C onnect an ext ernal 1% res istor fr om LO W SET to V DD

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.

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.

DD Power supply input.

TC620/TC621

3.0 DETAILED DESCRIPTION

The TC6 20 h as a pos it ive tem pe r atu re co efficient tem-

perat ure sensor and a d ual thresh old detector. Temp er-

ature set point programming is accomplished with

external resistors from the HIGH SET and LOW SET

input s to VDD. The HIGH LIMIT and LOW LIMIT output s

remain low as long as measured temperature is below

set point values. As measured temperature increases,

the LOW LIMIT outp ut is driven h igh when temperatu re

equals th e L OW SET se t p oin t (±3°C max). If tem pe ra-

ture continues to climb, the HIGH LIMIT output is driven

high w he n tem pe ratu r e e qu als t he H IGH SET se t 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 in pu t is cal cu lat ed u sin g Equ ati on 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

temperat ure settin g is at l east 5°C l ower 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 S ET and HIGH SET input s each hav e

built-in hysteresis of -2°C below the programmed

settings (Figure 3-3).

FIGURE 3-3: Built-In Hysteresis on 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) = 133.6 kΩ

TEMPERATURE

(°C)

RESISTANCE, RTRIP (kΩ)

-55 -35 -15 5 25 45 65 85 105 125

100

150

200

250

Set Point

(Set Point 2°C)

High Limit

or Low Limit

Output

TC620/TC621

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 tha t the pin num ber s for the HIGH SET an d LO W

SET programming resistors for the TC621 are reversed

versus that of the TC620 (i.e., the resistor value on

HIGH SET [ Pin 2] s hould alwa ys be lower tha n the on e

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 100 kΩ at 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-

misto r at the de sire d tempe ratur e. For ex ampl e, using

the dat a shown in Fi gure 3-4 , a 30 kΩ resisto r b etween

HIGH TEMP (Pin 2) and VDD (Pin 8) sets the high

tempera ture trip point a t +51°C and a 49 kΩ resi stor o n

LOW TEMP (Pin 3) sets the low temperature trip point

to +41°C.

FIGURE 3-4: Typical NTC Thermistor

3.5 TC620/TC621 Output s

Both devices have complimentary output stages. They

are rat ed at a sou rce or sink current of 1 mA maximum .

01020304050

100

TEMPERATURE (°C)

150

200

250

300

350

THERMISTOR RESISTANCE (kΩ)

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-

lato r. Wh en the temperat ure is below th e LOW T EMP

set poi nt, the output of the driver i s OFF. When the tem -

perature exceeds the LOW TEMP set point, the

TC4469 ga tes th e o sc il lato r s ign al to the output s o f th e

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 temperatu re and onl y allow the fa n to oper-

ate whe n needed and at the required spe ed to maint ain

the desire d temper ature. A high er powe r option ca n be

4.2 Temperature Controlled Fan

In the application in Figure 4-2, a high and a low tem-

perature is selected by two RL and 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

+12V VMOTOR

MOSFET

Fan Motor

50Ω

Higher Power Option

1N4148

TC4469

10k

100k

High

Limit

Low

Limit

Fan Motor

50 pF

Temperature Scale

Low Temp.

30 C

High Temp.

50 C

10 µF0.1 µF

– 30 C (Fan Off)

– 50 C (Fan Low)

– UP (Fan High)

˚ 1 µF

0 C

30 C

50 C

TC620

High Temp.

Low Temp.

+12V

MTP3055E

Fan Motor

TC621

High

Temp.

Low Temp.

+12V

MTP3055E

Fan Moto

Thermistor

(NTC)

TC620/TC621

FIGURE 4-3: Heating and Cooling Application

TC620

5TC4469

High

Temp.

Warning

Heating/Cooling

Equipment

Low

Temp.

Warning

4.5V to 18V

High

Temp.

Low

Temp.

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 713 Suffix Device

Pin 1

User Direction of Feed

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-Pin Plastic DIP

Dimensions: inches (mm)

TC620/TC621

Package Dimensions (Continued)

.050 (1.27) Typ.

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 SOIC

Dimensions: inches (mm)

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. T he Microchip Corporate Literature Center U.S. FAX: (480) 792-7277

3. The Microchip Worldwide Site (www.micr ochip.com)

Please specify which device, revision of silicon and Dat a Sheet (include Literature #) you are using.

New Customer Notification System

TC620/TC621

NOTES:

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR WAR-

RANTIES OF ANY KIN D WHETHER EXPRESS OR IMPLIED ,

WRITTEN OR ORAL, STATUTORY OR OTHERWISE,

RELATED TO THE INFORMATION, INCLUDING BUT NOT

LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE,

MERCHANTABILITY OR FITNESS FOR PURPOSE.

Microchip disclaims all liability arising from this information and

its use. U se of Microc hip’s products as critical com ponents in

life support systems is not authorized except with express

written approval by Microchip. No licenses are conveyed,

implicitly or otherwise, under any Microchip intellectual property

rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron,

dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICST ART,

PRO MATE, PowerSmart, rfPIC, and SmartShunt are

registered trademarks of Microchip Technology Incorporated

in the U.S.A. and other countries.

AmpLab, FilterLab, Migratable Memory, MX DE V, MXLAB,

SEEV AL, SmartSensor and The Embedded Control Solutions

Company are registered trademarks of Microchip Technology

Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, dsPICDEM,

dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,

FanSense, FlexROM, fuzzyLAB, In-Circuit Serial

Programming, ICSP, ICEPIC, Linear Active Thermistor,

MPASM, MPLI B, MPLI NK, MPSIM, PICkit , PICDEM,

PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo,

PowerMate, Powe rTool, Real ICE, rfLAB, rfPICDEM, Select

Mode, Smart Serial, SmartTel, Total Endurance, UNI/O,

WiperLock and Zena are trademarks of Microchip Technology

Incorporated in the U.S.A. and other countries.

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.

Printed on recycled paper.

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that i t s family of products is one of the most secure families of its kind on t he market t oday, when used i n the

intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is c onstantly evolving. We a t Microchip are commit ted to continuously improving the code protect ion f eatures of our

products. Attempts to break Microchip’ s code protection f eature may be a violati on of t he Digit al Millennium Copyright Act. If such act s

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Microchip received ISO/TS-16949:2002 quality system certification for

its worldwide headquarters, design and wafer fabrication facilities in

Chandler and Tempe, Arizona and Mountain View, California in

October 2003. The Company’s quality system processes and

procedures are for its PICmicro® 8-bit MCUs, KEELOQ® code hopping

devices, Serial EEPROMs, micro peripherals, nonvolat ile memory and

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

AMERICAS

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://support.microchip.com

Web Address:

www.microchip.com

Atlanta

Alpharetta, GA

Tel: 770-640-0034

Fax: 770-640-0307

Boston

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Chicago

Itasc a , IL

Tel: 630-285-0071

Fax: 630-285-0075

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

Detroit

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

Los A n ge les

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

San Jose

Mountain View, CA

Tel: 650-215-1444

Fax: 650-961-0286

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

ASIA/PACIFIC

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100

Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8676-6200

Fax: 86-28-8676-6599

China - Fuzhou

Tel: 86-591-8750-3506

Fax: 86-591-8750-3521

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

China - Shunde

Tel: 86-757-2839-5507

Fax: 86-757-2839-5571

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

China - Xian

Tel: 86-29-8833-7250

Fax: 86-29-8833-7256

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-2229-0061

Fax: 91-80-2229-0062

India - New Delhi

Tel: 91-11-5160-8631

Fax: 91-11-5160-8632

India - Pune

Tel: 91-20-2566-1512

Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

Korea - Gumi

Tel: 82-54-473-4301

Fax: 82-54-473-4302

Korea - Seoul

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Malaysia - Penang

Tel: 60-4-646-8870

Fax: 60-4-646-5086

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Taiwan - T aipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Thail a nd - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-399

Fax: 43-7242-2244-393

Denmark - Copenhage n

Tel: 45-4450-2828

Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-14 4-44

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Sp ain - Ma drid

Tel: 34-91-708-08-90

Fax: 34-91-708-08 -91

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921- 5820

WORLDWIDE SALES AND SERVICE

10/31/05