TC620/TC621 5V, Dual Trip Point Temperature Sensors Features: Package Type • User Programmable Hysteresis and 8-PDIP Temperature Set Point NC 1 8 VDD (cid:129) Easily Programs with 2 External Resistors LOW SET 2 TC620XCPA 7 HIGH LIMIT (cid:129) Wide Temperature Detection Range: HIGH SET 3 TC620XEPA 6 LOW LIMIT -0°C to 70°C: (TC620/TC621CCX) GND 4 5 CONTROL -40°C to +125°C: (TC620/TC621CVX) 8-PDIP -40°C to +85°C: (TC620/TC621CEX) THERMISTOR 1 8 VDD -55°C to +125°C: (TC620/TC621CMX) HIGH SET 2 TC621XCPA 7 HIGH LIMIT (cid:129) Onboard Temperature Sensing Applications LOW SET 3 TC621XEPA 6 LOW LIMIT (TC620X) GND 4 5 CONTROL (cid:129) External NTC Thermistor for Remote Sensing Applications (TC621X) 8-SOIC (cid:129) Available in 8-Pin PDIP and SOIC Packages NC 1 8 VDD LOW SET 2 TC620XCOA 7 LOW LIMIT Applications: HIGH SET 3 TC620XEOA 6 HIGH LIMIT TC620CVOA GND 4 5 CONTROL (cid:129) Power Supply Over Temperature Detection (cid:129) Consumer Equipment 8-SOIC (cid:129) Temperature Regulators THERMISTOR 1 8 VDD (cid:129) CPU Thermal Protection HIGH SET 2 TC621XCOA 7 HIGH LIMIT LOW SET 3 TC621XEOA 6 LOW LIMIT Device Selection Table GND 4 5 CONTROL Temperature Part Number Package Range General Description: TC620X*COA 8-Pin SOIC 0°C to +70°C The TC620 and TC621 are programmable logic output TC620X*CPA 8-Pin PDIP 0°C to +70°C temperature detectors designed for use in thermal TC620X*EOA 8-Pin SOIC -40°C to +85°C management applications. The TC620 features an TC620X*EPA 8-Pin PDIP -40°C to +85°C onboard temperature sensor, while the TC621 connects to an external NTC thermistor for remote TC620C*VOA 8-Pin SOIC -40°C to +125°C sensing applications. TC621X*COA 8-Pin SOIC 0°C to +70°C Both devices feature dual thermal interrupt outputs TC621X*CPA 8-Pin PDIP 0°C to +70°C (HIGH LIMIT and LOW LIMIT), each of which is pro- TC621X*EOA 8-Pin SOIC -40°C to +85°C grammed with a single external resistor. On the TC620, TC621X*EPA 8-Pin PDIP -40°C to +85°C these outputs are driven active (high) when measured temperature equals the user programmed limits. The Note: *The part code will be C or H (see CONTROL (hysteresis) output is driven high when tem- Functional Block Diagrams). 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. © 2006 Microchip Technology Inc. DS21439C-page 1

TC620/TC621 Functional Block Diagrams VDD 8 Temp. to Voltage Converter TC620 4 + 7 2 VREF – LOW LIMIT LOW SET GEN VREF + 6 HIGH LIMIT HIGH SET 3 VREF – GEN R S Q Q 5 CONTROL* VDD 8 Thermistor 1 Interface THERMISTOR Circuit TC621 4 + 7 HIGH LIMIT HIGH SET 2 VREF – GEN VREF + 6 LOW LIMIT LOW SET 3 VREF – GEN 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). DS21439C-page 2 © 2006 Microchip Technology Inc.

TC620/TC621 1.0 ELECTRICAL *Stresses above those listed under “Absolute Maxi- CHARACTERISTICS mum 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 Absolute Maximum Ratings* above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Supply Voltage.......................................................20V Maximum Rating conditions for extended periods may Input Voltage Any Input..(GND – 0.3V) to (V +0.3V) DD affect device reliability. Package Power Dissipation (T ≤ 70°C) A PDIP.............................................730 mW SOIC.............................................470 mW Derating Factors: Plastic..........................................8 mW/°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: T = 25°C, unless otherwise specified. A Symbol Parameter Min Typ Max Unit Test Conditions V Supply Voltage Range 4.5 — 18 V DD I Supply Current — 270 400 μA 5V ≤ V ≤ 18V DD DD R Output Resistance — 400 1000 W Output High or Low, 5V ≤ V ≤ 18V OUT DD I Output Current — — 1 mA Temp. Sensed Source/Sink OUT I Output Current — — 1 mA Cool/Heat Source/Sink OUT T Absolute Accuracy T - 3 T T + 3 °C T = Programmed Temperature ERR © 2006 Microchip Technology Inc. DS21439C-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) Symbol Description 0°C to +70°C -40°C to +85°C -40°C to +125°C 1 NC No Internal Connection. 2 LOW SET Low temperature set point. Connect an external 1% resistor from LOW SET to V DD to set trip point. 3 HIGH SET High temperature set point. Connect an external 1% resistor from HIGH SET to V to set trip point. DD 4 GND Ground Terminal. 5 CONTROL Control output. 6 HIGH LIMIT High temperature push/pull output. 7 LOW LIMIT Low temperature push/pull output. 8 V Power supply input. DD Pin No. (8-Pin PDIP) (8-Pin SOIC) Symbol Description 0°C to +70°C -40°C to +85°C 1 THERMISTOR Thermistor input. 2 HIGH SET High temperature set point. Connect an external 1% resistor from HIGH SET to V to set trip point. DD 3 LOW SET Low temperature set point. Connect an external 1% resistor from LOW SET to V to set trip point. DD 4 GND Ground Terminal. 5 CONTROL Control output. 6 LOW LIMIT Low temperature push/pull output. 7 HIGH LIMIT High temperature push/pull output. 8 V Power supply input. DD DS21439C-page 4 © 2006 Microchip Technology Inc.

TC620/TC621 3.0 DETAILED DESCRIPTION Care must also be taken to ensure the LOW SET temperature setting is at least 5°C lower than the HIGH The TC620 has a positive temperature coefficient tem- SET temperature setting. perature sensor and a dual threshold detector. Temper- Figure3-2 can help the user obtain an estimate of the ature set point programming is accomplished with external resistor values required for the desired LOW external resistors from the HIGH SET and LOW SET 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 250 equals the LOW SET set point (±3°C max). If tempera- Ω) ture continues to climb, the HIGH LIMIT output is driven (k P 200 RI high when temperature equals the HIGH SET set point RT (Figure3-1). The CONTROL (hysteresis) output is E, 150 C N latched in its active state at the temperature specified A T by the HIGH SET resistor. CONTROL is maintained SIS 100 E active until temperature falls to the value specified by R the LOW SET resistor. 50 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (°C) High Set Point FIGURE 3-2: TC620 Sense Resistors vs. Temperature Trip Temperature Low Set Point Low Limit Output 3.2 Built-in Hysteresis High Limit Output To prevent output “chattering” when measured Control Output (Cool Option temperature is at (or near) the programmed trip point Control Output (Heat Option) values, the LOW SET and HIGH SET inputs each have built-in hysteresis of -2°C below the programmed FIGURE 3-1: TC620/TC621 Input vs. settings (Figure3-3). Output Logic 3.1 Programming the TC620 The resistor values to achieve the desired trip point Set Point temperatures on HIGH SET and LOW SET are (Set Point 2°C) calculated using Equation3-1: EQUATION 3-1: High Limit R = 0.5997 x T 2.1312 or Low Limit TRIP Output Where: R = Programming resistor in Ohms TRIP FIGURE 3-3: Built-In Hysteresis on Low T = The desired trip point temperature in degrees Limit and High Limit Outputs Kelvin. As shown, the outputs remain in their active state For example, a 50°C setting on either the HIGH SET (hysteresis) until temperature falls an additional 2°C or LOW SET input is calculated using Equation3-2 as below the user’s setting. follows: EQUATION 3-2: R = 0.5997 x ((50 + 273.15)2.1312) = 133.6 kΩ 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. © 2006 Microchip Technology Inc. DS21439C-page 5

TC620/TC621 3.3 Using the TC621 The TC621 operation is similar to that of the TC620, but 350 requires an external NTC thermistor. Use the resis- 300 tance versus temperature curve of the thermistor to determine the values of the programming resistors. 250 Ω) NSEotTe pthroagt rtahme mpiinn gn uremsbisetrosr sfo for rt hthee H TIGC6H2 S1 EaTre a rnedv eLrOseWd NCE (k 200 A versus that of the TC620 (i.e., the resistor value on SIST 150 HIGH SET [Pin 2] should always be lower than the one RE connected to LOW SET [Pin 3]). Also note that the OR 100 T S outputs of the TC621 are LOW TRUE when used with MI R 50 an NTC thermistor. HE T 0 0 10 20 30 40 50 60 70 3.4 TC621 Thermistor Selection TEMPERATURE (°C) The TC621 uses an external thermistor to monitor the FIGURE 3-4: Typical NTC Thermistor controlling temperature. A thermistor with a resistance value of approximately 100 kΩ at 25°C is 3.5 TC620/TC621 Outputs recommended. A temperature set point is selected by picking a resis- Both devices have complimentary output stages. They tor whose value is equal to the resistance of the ther- are rated at a source or sink current of 1 mA maximum. mistor at the desired temperature. For example, using the data shown in Figure3-4, a 30 kΩ resistor between HIGH TEMP (Pin 2) and V (Pin 8) sets the high DD temperature trip point at +51°C and a 49 kΩ resistor on LOW TEMP (Pin 3) sets the low temperature trip point to +41°C. DS21439C-page 6 © 2006 Microchip Technology Inc.

TC620/TC621 4.0 TYPICAL APPLICATIONS 4.2 Temperature Controlled Fan In the application in Figure4-2, a high and a low tem- 4.1 Dual Speed Temperature Control perature is selected by two R and R . The TC620 L H monitors the ambient temperature and turns the FET In Figure4-1, the Dual Speed Temperature Control switch on when the temperature exceeds the HIGH uses a TC620 and a TC4469 quad driver. Two of the TEMP set point. The fan remains on until the tempera- drivers of the TC4469 are configured in a simple oscil- ture decreases to the LOW TEMP set point. This lator. When the temperature is below the LOW TEMP provides the hysteresis. In this application, the fan set point, the output of the driver is OFF. When the tem- turns on only when required. perature exceeds the LOW TEMP set point, the TC4469 gates the oscillator signal to the outputs of the The TC621 uses an external thermistor to monitor the driver. This square wave signal modulates the remain- ambient temperature. This adds one part, but allows ing outputs and drives the motor at a low speed. If this more flexibility with the location of the temperature speed cannot keep the temperature below the HIGH sensor. 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. +12V VMOTOR 0.1 µF 10 µF 1M Fan Motor Low Temp. 8 14 30˚ C High 1N4148 100k 2 6 2 13 3 Limit 1 4 50Ω MOSFET TC620 1 3 6 50 pF High Temp. 1N4148 TC4469 50˚ C 5 Low 7 5 9 Limit 8 10 Higher Power Option 11 4 Temperature Scale 12 0˚ C – 30 ˚ C (Fan Off) 1 µF 10k 7 Fan Motor 30˚ C – 50 ˚ C (Fan Low) 50˚ C – UP (Fan High) FIGURE 4-1: Dual Speed Temperature Control +12V +12V Thermistor (NTC) Low Temp. 1 8 Fan Motor High 1 8 Fan Motor RL Temp. 2 TC620 7 2 TC621 7 3 6 RH 3 6 RH 4 5 MTP3055E Low Temp. RL 4 5 MTP3055E High Temp. FIGURE 4-2: Temperature Controlled Fan © 2006 Microchip Technology Inc. DS21439C-page 7

TC620/TC621 4.5V to 18V High Low Temp. Temp. 1 8 1 14 1k 2 7 2 13 TC620 3 6 3 12 4 5 4 TC4469 11 1k High Low 5 10 Temp. Temp. 6 9 Warning Warning 7 8 Heating/Cooling Equipment FIGURE 4-3: Heating and Cooling Application DS21439C-page 8 © 2006 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 713 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) .070 (1.78) .030 (0.76) .040 (1.02) .310 (7.87) .400 (10.16) .290 (7.37) .348 (8.84) .200 (5.08) .140 (3.56) .040 (1.02) .020 (0.51) .015 (0.38) 3° Min. .150 (3.81) .008 (0.20) .115 (2.92) .400 (10.16) .310 (7.87) .110 (2.79) .022 (0.56) .090 (2.29) .015 (0.38) Dimensions: inches (mm) © 2006 Microchip Technology Inc. DS21439C-page 9

TC620/TC621 Package Dimensions (Continued) 8-Pin SOIC Pin 1 .157 (3.99) .244 (6.20) .150 (3.81) .228 (5.79) .050 (1.27) Typ. .197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) 8° Max. .010 (0.25) .007 (0.18) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .050 (1.27) .016 (0.40) Dimensions: inches (mm) DS21439C-page 10 © 2006 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. © 2006 Microchip Technology Inc. DS21439C-page 11

TC620/TC621 NOTES: DS21439C-page 12 © 2006 Microchip Technology Inc.

Note the following details of the code protection feature on Microchip devices: (cid:129) Microchip products meet the specification contained in their particular Microchip Data Sheet. (cid:129) Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. (cid:129) 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. (cid:129) Microchip is willing to work with the customer who is concerned about the integrity of their code. (cid:129) 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 constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device Trademarks applications and the like is provided only for your convenience The Microchip name and logo, the Microchip logo, Accuron, and may be superseded by updates. It is your responsibility to dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, ensure that your application meets with your specifications. PROMATE, PowerSmart, rfPIC, and SmartShunt are MICROCHIP MAKES NO REPRESENTATIONS OR WAR- registered trademarks of Microchip Technology Incorporated RANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, in the U.S.A. and other countries. WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, SEEVAL, SmartSensor and The Embedded Control Solutions MERCHANTABILITY OR FITNESS FOR PURPOSE. Company are registered trademarks of Microchip Technology Microchip disclaims all liability arising from this information and Incorporated in the U.S.A. its use. Use of Microchip’s products as critical components in Analog-for-the-Digital Age, Application Maestro, dsPICDEM, life support systems is not authorized except with express dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, written approval by Microchip. No licenses are conveyed, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial implicitly or otherwise, under any Microchip intellectual property Programming, ICSP, ICEPIC, Linear Active Thermistor, rights. MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, 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. © 2006, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. 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, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. © 2006 Microchip Technology Inc. DS21439C-page 13

WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office Australia - Sydney India - Bangalore Austria - Wels 2355 West Chandler Blvd. Tel: 61-2-9868-6733 Tel: 91-80-2229-0061 Tel: 43-7242-2244-399 Chandler, AZ 85224-6199 Fax: 61-2-9868-6755 Fax: 91-80-2229-0062 Fax: 43-7242-2244-393 Tel: 480-792-7200 China - Beijing India - New Delhi Denmark - Copenhagen Fax: 480-792-7277 Tel: 86-10-8528-2100 Tel: 91-11-5160-8631 Tel: 45-4450-2828 Technical Support: Fax: 86-10-8528-2104 Fax: 91-11-5160-8632 Fax: 45-4485-2829 http://support.microchip.com Web Address: China - Chengdu India - Pune France - Paris www.microchip.com Tel: 86-28-8676-6200 Tel: 91-20-2566-1512 Tel: 33-1-69-53-63-20 Fax: 86-28-8676-6599 Fax: 91-20-2566-1513 Fax: 33-1-69-30-90-79 Atlanta Alpharetta, GA China - Fuzhou Japan - Yokohama Germany - Munich Tel: 770-640-0034 Tel: 86-591-8750-3506 Tel: 81-45-471- 6166 Tel: 49-89-627-144-0 Fax: 770-640-0307 Fax: 86-591-8750-3521 Fax: 81-45-471-6122 Fax: 49-89-627-144-44 Boston China - Hong Kong SAR Korea - Gumi Italy - Milan Westborough, MA Tel: 852-2401-1200 Tel: 82-54-473-4301 Tel: 39-0331-742611 Tel: 774-760-0087 Fax: 852-2401-3431 Fax: 82-54-473-4302 Fax: 39-0331-466781 Fax: 774-760-0088 China - Qingdao Korea - Seoul Netherlands - Drunen Chicago Tel: 86-532-8502-7355 Tel: 82-2-554-7200 Tel: 31-416-690399 Itasca, IL Fax: 86-532-8502-7205 Fax: 82-2-558-5932 or Fax: 31-416-690340 Tel: 630-285-0071 China - Shanghai 82-2-558-5934 Spain - Madrid Fax: 630-285-0075 Tel: 86-21-5407-5533 Malaysia - Penang Tel: 34-91-708-08-90 Dallas Fax: 86-21-5407-5066 Tel: 60-4-646-8870 Fax: 34-91-708-08-91 Addison, TX China - Shenyang Fax: 60-4-646-5086 UK - Wokingham Tel: 972-818-7423 Tel: 86-24-2334-2829 Philippines - Manila Tel: 44-118-921-5869 Fax: 972-818-2924 Fax: 86-24-2334-2393 Tel: 63-2-634-9065 Fax: 44-118-921-5820 Detroit China - Shenzhen Fax: 63-2-634-9069 Farmington Hills, MI Tel: 86-755-8203-2660 Singapore Tel: 248-538-2250 Fax: 86-755-8203-1760 Tel: 65-6334-8870 Fax: 248-538-2260 China - Shunde Fax: 65-6334-8850 Kokomo Tel: 86-757-2839-5507 Taiwan - Hsin Chu Kokomo, IN Fax: 86-757-2839-5571 Tel: 886-3-572-9526 Tel: 765-864-8360 China - Wuhan Fax: 886-3-572-6459 Fax: 765-864-8387 Tel: 86-27-5980-5300 Taiwan - Kaohsiung Los Angeles Fax: 86-27-5980-5118 Tel: 886-7-536-4818 Mission Viejo, CA China - Xian Fax: 886-7-536-4803 Tel: 949-462-9523 Tel: 86-29-8833-7250 Taiwan - Taipei Fax: 949-462-9608 Fax: 86-29-8833-7256 Tel: 886-2-2500-6610 San Jose Fax: 886-2-2508-0102 Mountain View, CA Thailand - Bangkok Tel: 650-215-1444 Tel: 66-2-694-1351 Fax: 650-961-0286 Fax: 66-2-694-1350 Toronto Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509 10/31/05 DS21439C-page 14 © 2006 Microchip Technology Inc.

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrochip: TC621CEPA TC620CEOA TC620CEPA TC620HCOA TC620HEPA TC621HCPA