TC623 3V, Dual Trip Point Temperature Sensor Features: Package Type • Integrated Temp Sensor and Detector Operate from a Supply Voltage as Low as 2.7V • Replaces Mechanical Thermostats and Switches • On-Chip Temperature Sense • 8-Pin DIP or SOIC for Direct PCB Mounting • 2 User Programmable Temperature Set Points • 2 Independent Temperature Limit Outputs • Heat/Cool Regulate Output Applications: • • • • • • CPU Thermal Management System Over or Under Temperature Shutdown Advanced Thermal Warning Fan Speed Control Circuits Accurate Appliance Temperature Sensing Environmental Control Device Selection Table Part Number Package Temp. Range TC623CCOA 8-Pin SOIC 0°C to +70°C TC623CCPA 8-Pin PDIP 0°C to +70°C TC623CEOA 8-Pin SOIC -40°C to +85°C TC623CEPA 8-Pin PDIP -40°C to +85°C TC623CVOA 8-Pin SOIC -40°C to +125°C Note: Latch Output (C option), is a Standard Device Contact Factory for Latch Q Output (H option). Functional Block Diagram NC 1 2 1 8 VCC LOW SET 2 7 LOW LIMIT HIGH SET 3 GND 4 5 CONTROL NC TC623CCOA TC623CEOA 6 TC623CVOA HIGH LIMIT PDIP NC 1 LOW SET 2 HIGH SET 3 GND 4 TC623CCPA TC623CEPA 8 VCC 7 LOW LIMIT 6 HIGH LIMIT 5 CONTROL General Description The TC623 is a 3V solid-state, programmable temperature sensor designed for use in thermal management applications. It features dual thermal interrupt outputs (LOW LIMIT and HIGH LIMIT) each of which are set with an external resistor. The HIGH LIMIT and LOW LIMIT outputs are driven active (high) when measured temperature equals the user programmed limits. The CONTROL output is driven active (high) when temperature equals the HIGH LIMIT set point and turned off when temperature falls below the LOW LIMIT set point. The CONTROL output can be used to provide simple ON/OFF control to a cooling fan if so desired. Low voltage operation, easy set point programming, small size and low cost make the TC623 an ideal choice for many thermal management applications. 8 Temperature To Voltage Converter VREF Gen. VCC TC623 + LOW SET SOIC 7 LOW LIMIT – VREF + 6 HIGH LIMIT HIGH SET GND 3 VREF Gen. – R SQ Latch 4 5 CONTROL RLOW < R HIGH © 2006 Microchip Technology Inc. DS21441C-page 1 TC623 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 ......................................................5.5V Input Voltage Any Input .. (GND – 0.3V) to (VDD +0.3V) Package Power Dissipation (TA ≤ 70°C) Plastic DIP ............................................730 mW SOIC.....................................................470 mW Derating Factors Plastic DIP ...........................................8 mW/°C SOIC ....................................................6 mW/°C Operating Temperature 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 TC623 ELECTRICAL SPECIFICATIONS Electrical Characteristics: Over Operating Temperature Range, VDD = 2.7V to 4.5V, unless otherwise specified. Symbol Parameter Min Typ. Max Unit VDD Supply Voltage Range 2.7 — 4.5 V IDD Supply Current — 150 250 μA Test Conditions 2.7V ≤ VDD ≤ 4.5V TSET Absolute Accuracy T- 3 T ±1 T+3 °C T = Programmed Temperature VOH Output Voltage High 0.9 x VDD 0.8 x VDD — — — — V V IOH = 250 μA IOH = 500 μA VOL Output Voltage Low — — — — 0.1 x VDD 0.2 x VDD V V IOL = 500 μA IOL = 1 mA HYS Hysteresis — — -2 °C Falling Temperature DS21441C-page 2 © 2006 Microchip Technology Inc. TC623 2.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (8-Pin SOIC) (8-Pin PDIP) 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 VCC © 2006 Microchip Technology Inc. Power supply input. DS21441C-page 3 TC623 3.0 DETAILED DESCRIPTION 3.1 TC623 Operation The TC623 has a positive temperature coefficient (Silicon) temperature sensor and dual threshold detector. Temperature set point programming is accomplished with external resistors from the HIGH SET and LOW SET inputs to VCC. The HIGH LIMIT and LOW LIMIT outputs remain inactive (low) as long as the measured temperature is below set point values. As temperature increases, the LOW LIMIT is driven high when temperature equals the LOW LIMIT set point (±3°C). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature equals the HIGH LIMIT set point (±3°C). Figure 3-1 shows the relationship between the sense resistance values and trip point temperature. FIGURE 3-1: TC623 SENSE RESISTORS VS. TRIP TEMPERATURE RESISTANCE, RTRIP (kΩ) 250 200 150 100 50 -55 -35 -15 5 25 45 65 85 105 125 The CONTROL output is driven high when the HIGH LIMIT output goes high and is RESET low when the LOW LIMIT output goes low. This output provides the logic for simple ON/OFF fan control. Figure 3-2 shows overall TC623 operation. FIGURE 3-2: TC623 TEMPERATURE VS. OUTPUT High Set Point Temperature Low Set Point Low Limit Output High Limit Output Control Output (Cool Option) To prevent output “chattering” when measured temperature is at (or near) the trip point values, the LOW SET and HIGH SET inputs each have a built-in hysteresis of -2°C max. As a result, the HIGH LIMIT and LOW LIMIT outputs remain active until the measured temperature falls a maximum of 2°C below the programmed HIGH SET and LOW SET thresholds as shown in Figure 3-3. The programmed setting threshold of Figure 3-3 is user programmed temperature trip points of either the LOW SET or HIGH SET inputs. The LOW LIMIT or HIGH LIMIT output is driven active when temperature equals the set point value (to within 3°C). The output remains active until the temperature falls an additional 2°C below the set point due to hysteresis. FIGURE 3-3: TEMPERATURE (°C) HIGH SET AND LOW SET THRESHOLDS Programmed Setpoint -2°C Hysteresis High Limit or Low Limit Ouput DS21441C-page 4 © 2006 Microchip Technology Inc. TC623 4.0 TYPICAL APPLICATIONS 4.1 Mounting If the TC623 is used to measure the temperature of another device, it is important that the top surface of the TC623 package be in intimate contact with the measured device. Good thermal conductivity and no air space is critical to accurate temperature measurement in applications of this type. 4.2 Trip Point Programming The resistance values required for the HIGH SET and LOW SET inputs are calculated using the formula below: RTRIP = 0.5997 x T 2.1312 Where; RTRIP = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. For example, to program a trip point of 50°C, the programming resistor is: RTRIP = 0.5997 x (50 + 273.15)2.1312) = 133.65 kΩ © 2006 Microchip Technology Inc. DS21441C-page 5 TC623 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 8-Pin SOIC (N) 5.3 Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 12 mm 8 mm 2500 13 in Package Dimensions 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) DS21441C-page 6 © 2006 Microchip Technology Inc. TC623 Package Dimensions (Continued) 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) © 2006 Microchip Technology Inc. DS21441C-page 7 TC623 NOTES: DS21441C-page 8 © 2006 Microchip Technology Inc. TC623 THE MICROCHIP WEB SITE CUSTOMER SUPPORT Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information: Users of Microchip products can receive assistance through several channels: • Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software • General Technical Support – Frequently Asked Questions (FAQ), technical support requests, online discussion groups, Microchip consultant program member listing • Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives • • • • • Distributor or Representative Local Sales Office Field Application Engineer (FAE) Technical Support Development Systems Information Line Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://support.microchip.com CUSTOMER CHANGE NOTIFICATION SERVICE Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. To register, access the Microchip web site at www.microchip.com, click on Customer Change Notification and follow the registration instructions. © 2006 Microchip Technology Inc. DS21441C-page 9 TC623 READER RESPONSE It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150. Please list the following information, and use this outline to provide us with your comments about this document. To: Technical Publications Manager RE: Reader Response Total Pages Sent ________ From: Name Company Address City / State / ZIP / Country Telephone: (_______) _________ - _________ FAX: (______) _________ - _________ Application (optional): Would you like a reply? Device: TC623 Y N Literature Number: DS21441C Questions: 1. What are the best features of this document? 2. How does this document meet your hardware and software development needs? 3. Do you find the organization of this document easy to follow? If not, why? 4. What additions to the document do you think would enhance the structure and subject? 5. What deletions from the document could be made without affecting the overall usefulness? 6. Is there any incorrect or misleading information (what and where)? 7. How would you improve this document? DS21441C-page 10 © 2006 Microchip Technology Inc. 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 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. • 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 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 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 WARRANTIES OF ANY KIND 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. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. 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, PICSTART, 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, MXDEV, MXLAB, SEEVAL, 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, 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. 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