TC620/TC621 5V, Dual Trip Point Temperature Sensors Features Package Type • 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) • Available in 8-Pin PDIP and SOIC Packages Applications • • • • Power Supply Over Temperature Detection Consumer Equipment Temperature Regulators CPU Thermal Protection 8-PDIP NC 1 LOW SET 2 HIGH SET 3 TC620XCPA TC620XEPA 8-PDIP THERMISTOR 1 HIGH SET 2 LOW SET 3 TC621XCPA TC621XEPA Package 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 NOTE: *The part code will be C or H. (See Functional Block Diagrams). 6 LOW LIMIT 5 CONTROL 8-SOIC NC 1 8 VDD LOW SET 2 7 LOW LIMIT HIGH SET 3 GND 4 TC620XCOA TC620XEOA TC620CVOA 6 HIGH LIMIT 5 CONTROL 8-SOIC LOW SET 3 Part Number VDD 7 HIGH LIMIT 8 GND 4 HIGH SET 2 Temperature Range 6 LOW LIMIT 5 CONTROL GND 4 THERMISTOR 1 Device Selection Table VDD 7 HIGH LIMIT 8 VDD 7 HIGH LIMIT 8 TC621XCOA TC621XEOA GND 4 6 LOW LIMIT 5 CONTROL 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 programmed 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 temperature 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. 2002 Microchip Technology Inc. DS21439B-page 1 TC620/TC621 Functional Block Diagrams VDD 8 Temp. to Voltage Converter 4 TC620 + 2 LOW SET VREF GEN 7 LOW LIMIT – VREF + HIGH SET 3 VREF GEN 6 HIGH LIMIT – R S Q Q 5 CONTROL* VDD 8 1 THERMISTOR Thermistor Interface Circuit 4 TC621 + HIGH SET 2 VREF GEN 7 HIGH LIMIT – VREF + LOW SET 3 VREF GEN 6 LOW LIMIT – R S Q Q 5 CONTROL* *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 Ratings" 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. Exposure 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 (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 TC620/TC621 ELECTRICAL SPECIFICATIONS Electrical Characteristics: TA = 25°C, unless otherwise specified. Symbol Parameter Min Typ Max Unit VDD Supply Voltage Range 4.5 — 18 V IDD Supply Current — 270 400 µA Test Conditions 5V ≤ 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 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 Pin No. (8-Pin PDIP) (8-Pin SOIC) 0°C to +70°C -40°C to +85°C -40°C to +125°C Symbol 1 NC 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 Description No Internal Connection. Ground Terminal. 5 CONTROL Control output. 6 HIGH LIMIT High temperature push/pull output. 7 LOW LIMIT Low temperature push/pull output. 8 VDD Power supply input. Pin No. (8-Pin PDIP) (8-Pin SOIC) 0°C to +70°C -40°C to +85°C Symbol 1 THERMISTOR 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 Description Thermistor input. Ground Terminal. 5 CONTROL Control output. 6 LOW LIMIT Low temperature push/pull output. 7 HIGH LIMIT 8 VDD DS21439B-page 4 High temperature push/pull output. Power supply input. 2002 Microchip Technology Inc. TC620/TC621 DETAILED DESCRIPTION The TC620 has a positive temperature coefficient temperature sensor and a dual threshold detector. Temperature 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 output is driven high when temperature equals the LOW SET set point (±3°C max). If temperature 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 3-1: TC620/TC621 INPUT VS. OUTPUT LOGIC Care must also be taken to ensure the LOW SET temperature setting is at least 5°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: 200 150 100 50 -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 Control Output (Cool Option Control Output (Heat Option) 3.1 TC620 SENSE RESISTORS VS. TRIP TEMPERATURE 250 RESISTANCE, RTRIP (kΩ) 3.0 Programming the TC620 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: 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: BUILT-IN HYSTERESIS ON LOW LIMIT AND HIGH LIMIT OUTPUTS Set Point (Set Point 2˚C) RTRIP = 0.5997 x T 2.1312 Where: RTRIP = Programming resistor in Ohms 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: High Limit or Low Limit Output 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: RSET = 0.5997 x ((50 + 273.15)2.1312) = 133.6kΩ Care must be taken to ensure the LOW SET programming 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 Using the TC621 The TC621 operation is similar to that of the TC620, but requires an external NTC thermistor. Use the resistance 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 FIGURE 3-4: 300 250 200 150 100 50 0 0 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. A temperature set point is selected by picking a resistor whose value is equal to the resistance of the thermistor at the desired temperature. For example, using the data shown in Figure 3-4, a 30kΩ resistor between HIGH TEMP (Pin 2) and VDD (Pin 8) sets the high 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 TYPICAL NTC THERMISTOR 350 THERMISTOR RESISTANCE (kΩ) 3.3 10 20 30 40 50 60 70 TEMPERATURE (˚C) 3.5 TC620/TC621 Outputs Both devices have complimentary output stages. They are rated at a source or sink current of 1mA maximum. 2002 Microchip Technology Inc. TC620/TC621 4.0 TYPICAL APPLICATIONS 4.2 4.1 Dual Speed Temperature Control In the application in Figure 4-2, a high and a low temperature 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 temperature 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 oscillator. When the temperature is below the LOW TEMP set point, the output of the driver is OFF. When the temperature exceeds the LOW TEMP set point, the TC4469 gates the oscillator signal to the outputs of the driver. This square wave signal modulates the remaining 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 operate 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. FIGURE 4-1: Temperature Controlled Fan 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. DUAL SPEED TEMPERATURE CONTROL +12V 0.1µF 2 3 High Temp. 1 5 50˚C High 6 1N4148 Limit TC620 Low 7 Limit Temperature Scale 1M 1N4148 1µF Fan Motor 14 2 1 3 5 8 TC4469 4 0˚C – 30˚ C (Fan Off) 30˚C – 50˚ C (Fan Low) 50˚C – UP (Fan High) FIGURE 4-2: 10µF 8 Low Temp 30˚C VMOTOR 10k 13 4 6 9 10 11 12 100k 50 Ω MOSFET 50pF Higher Power Option 7 Fan Motor TEMPERATURE CONTROLLED FAN +12V +12V Thermistor (NTC) Low Temp. 1 RL 2 3 RH 4 High Temp. 8 TC620 2002 Microchip Technology Inc. Fan Motor 7 6 5 MTP3055E High Temp. 1 2 RH 3 Low Temp. RL 4 8 TC621 Fan Motor 7 6 5 MTP3055E DS21439B-page 7 TC620/TC621 FIGURE 4-3: HEATING AND COOLING APPLICATION 4.5V to 18V High Temp. Low Temp. 1 2 3 4 TC620 8 7 6 5 1 2 3 4 5 6 7 TC4469 14 13 12 11 10 9 8 1k 1k High Temp. Warning Low Temp. Warning Heating/Cooling Equipment DS21439B-page 8 2002 Microchip Technology Inc. TC620/TC621 5.0 PACKAGING INFORMATION 5.1 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 12 mm 8 mm 2500 13 in 8-Pin SOIC (N) 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) .150 (3.81) .115 (2.92) .110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) .015 (0.38) .008 (0.20) 3° MIN. .400 (10.16) .310 (7.87) 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) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .010 (0.25) .007 (0.18) 8° MAX.. .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 recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 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 components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, 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 Technology 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 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. 2002 Microchip Technology Inc. DS21439B-page 13 WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC Japan Corporate Office Australia 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 Microchip Technology Japan K.K. Benex S-1 6F 3-18-20, Shinyokohama Kohoku-Ku, Yokohama-shi Kanagawa, 222-0033, Japan Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Rocky Mountain China - Beijing 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 Microchip Technology Consulting (Shanghai) Co., Ltd., Beijing Liaison Office Unit 915 Bei Hai Wan Tai Bldg. No. 6 Chaoyangmen Beidajie Beijing, 100027, No. China Tel: 86-10-85282100 Fax: 86-10-85282104 Atlanta 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 Fax: 770-640-0307 Boston 2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821 Chicago 333 Pierce Road, Suite 180 Itasca, IL 60143 Tel: 630-285-0071 Fax: 630-285-0075 Dallas 4570 Westgrove Drive, Suite 160 Addison, TX 75001 Tel: 972-818-7423 Fax: 972-818-2924 Detroit Tri-Atria Office Building 32255 Northwestern Highway, Suite 190 Farmington Hills, MI 48334 Tel: 248-538-2250 Fax: 248-538-2260 Kokomo 2767 S. Albright Road Kokomo, Indiana 46902 Tel: 765-864-8360 Fax: 765-864-8387 Los Angeles 18201 Von Karman, Suite 1090 Irvine, CA 92612 Tel: 949-263-1888 Fax: 949-263-1338 China - Chengdu Microchip Technology Consulting (Shanghai) Co., Ltd., Chengdu Liaison Office Rm. 2401, 24th Floor, Ming Xing Financial Tower No. 88 TIDU Street Chengdu 610016, China Tel: 86-28-6766200 Fax: 86-28-6766599 China - Fuzhou Microchip Technology Consulting (Shanghai) Co., Ltd., Fuzhou Liaison Office Unit 28F, World Trade Plaza No. 71 Wusi Road Fuzhou 350001, China Tel: 86-591-7503506 Fax: 86-591-7503521 China - Shanghai Microchip Technology Consulting (Shanghai) Co., Ltd. Room 701, Bldg. B Far East International Plaza No. 317 Xian Xia Road Shanghai, 200051 Tel: 86-21-6275-5700 Fax: 86-21-6275-5060 China - Shenzhen 150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335 Microchip Technology Consulting (Shanghai) Co., Ltd., Shenzhen Liaison Office Rm. 1315, 13/F, Shenzhen Kerry Centre, Renminnan Lu Shenzhen 518001, China Tel: 86-755-2350361 Fax: 86-755-2366086 San Jose Hong Kong Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408-436-7950 Fax: 408-436-7955 Microchip Technology Hongkong Ltd. Unit 901-6, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 New York Toronto 6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509 India 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 Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan Microchip Technology Taiwan 11F-3, No. 207 Tung Hua North Road Taipei, 105, Taiwan Tel: 886-2-2717-7175 Fax: 886-2-2545-0139 EUROPE Denmark Microchip Technology Nordic ApS Regus Business Centre Lautrup hoj 1-3 Ballerup DK-2750 Denmark Tel: 45 4420 9895 Fax: 45 4420 9910 France Microchip Technology SARL Parc d’Activite du Moulin de Massy 43 Rue du Saule Trapu Batiment A - ler Etage 91300 Massy, France Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Germany Microchip Technology GmbH Gustav-Heinemann Ring 125 D-81739 Munich, Germany Tel: 49-89-627-144 0 Fax: 49-89-627-144-44 Italy Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus 1 V. Le Colleoni 1 20041 Agrate Brianza 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 *DS21439B* DS21439B-page 14 2002 Microchip Technology Inc.
* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project