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? 2001-2012 microchip technology inc. ds21441d-page 1 tc623 features: 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 functional block diagram package type general description the tc623 is a 3v solid-state, programmable temper- ature 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 temper- ature 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. part number package temp. range tc623ccoa 8-pin soic 0c to +70c tc623ccpa 8-pin pdip 0c to +70c tc623ceoa 8-pin soic -40c to +85c tc623cepa 8-pin pdip -40c to +85c tc623cvoa 8-pin soic -40c to +125c note: latch output (c option), is a standard device contact factory for latch q output (h option). 3 high set 2 low set 1 nc 4 gnd 5 control 6 high limit v cc 7 low limit 8 latch q sr + + ? ? tc623 r < r low high v ref gen. v ref gen. v ref temperature to voltage converter gnd high set pdip soic nc gnd high set low setlow set nc v cc high limit control low limit v cc high limitcontrol low limit 8 7 6 5 1 2 3 4 1 8 2 7 3 6 4 5 tc623ccoa tc623ceoatc623cvoa tc623ccpa tc623cepa 3v, dual trip point temperature sensor downloaded from: http:///
tc623 ds21441d-page 2 ? 2001-2012 microchip technology inc. 1.0 electrical characteristics absolute maximum ratings* supply voltage ......................................................5.5v input voltage any input .. (gnd C 0.3v) to (v dd +0.3v) package power dissipation (t a ? 70c) plastic dip ............................................730 mw soic.....................................................470 mw derating factors plastic dip ...........................................8 mw/c soic ....................................................6 mw/c operating temperature v version .................................-40c to +125c e version ...................................-40c to +85c c version ...................................... 0c to +70c storage temperature..........................-65c to +150c *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. tc623 electrical specifications electrical characteristics: over operating temperature range, v dd = 2.7v to 4.5v, unless otherwise specified. symbol parameter min typ. max unit test conditions v dd supply voltage range 2.7 4.5 v i dd supply current 150 250 ?? a2 . 7 v ? v dd ? 4.5v t set absolute accuracy t - 3 t 1 t + 3 c t = programmed temperature v oh output voltage high 0.9 x v dd 0.8 x v dd vv i oh = 250 ? a i oh = 500 ? a v ol output voltage low 0.1 x v dd 0.2 x v dd vv i ol = 500 ?? a i ol = 1 ma hys hysteresis -2 c falling temperature downloaded from: http:///
? 2001-2012 microchip technology inc. ds21441d-page 3 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 description 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 dd 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 cc power supply input. downloaded from: http:///
tc623 ds21441d-page 4 ? 2001-2012 microchip technology inc. 3.0 detailed description 3.1 tc623 operation the tc623 has a positive temperature coefficient (silicon) temperature sensor and dual threshold detec- tor. temperature set point programming is accom- plished with external resistors from the high set and low set inputs to v cc . 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 (3c). if temperature continues to climb, the high limit output is driven high when temperature equals the high limit set point (3c). figure 3-1 shows the relationship between the sense resistance values and trip point temperature. figure 3-1: tc623 sense resistors vs. trip temperature 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 to prevent output chattering when measured temper- ature is at (or near) the trip point values, the low set and high set inputs each have a built-in hysteresis of -2c max. as a result, the high limit and low limit outputs remain active until the measured temperature falls a maximum of 2c 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 3c). the output remains active until the temperature falls an additional 2c below the set point due to hysteresis. figure 3-3: high set and low set thresholds temperature (c) resistance, r trip (k ) -55 -35 -15 5 25 45 65 85 105 125 50 100 150 200 250 low set point high set point low limit output high limit output control output (cool option) temperature programmed setpoint -2c hysteresis high limit or low limit ouput downloaded from: http:///
? 2001-2012 microchip technology inc. ds21441d-page 5 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: for example, to program a trip point of 50c, the programming resistor is: r trip = 0.5997 x t 2.1312 where; r trip = programming resistor value in ohms t = desired trip temperature in degrees kelvin. r trip = 0.5997 x (50 + 273.15) 2.1312 ) = 133.65 k ? downloaded from: http:///
tc623 ds21441d-page 6 ? 2001-2012 microchip technology inc. 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 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 orientationfor 713 suffix device pin 1 user direction of feed p w downloaded from: http:///
? 2001-2012 microchip technology inc. ds21441d-page 7 tc623 5.3 package dimensions .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 soic dimensions: inches (mm) note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging 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) note: for the most current package drawings, please see the microchip packaging sp ecification located at http://www.microchip.com/packaging downloaded from: http:///
tc623 ds21441d-page 8 ? 2001-2012 microchip technology inc. 6.0 revision history revision d (december 2012) added a note to each package outline drawing. downloaded from: http:///
? 2001-2012 microchip technology inc. ds21441d-page 9 tc623 the microchip web site 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: product support C data sheets and errata, application notes and sample programs, design resources, users guides and hardware support documents, latest software releases and archived software general technical support C frequently asked questions (faq), technical support requests, online discussion groups, microchip consultant program member listing business of microchip C product selector and ordering guides, latest microchip press releases, listing of seminars and events, listings of microchip sales offices, distributors and factory representatives customer change notification service microchips 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 . under support, click on customer change notification and follow the registration instructions. customer support users of microchip products can receive assistance through several channels: distributor or representative local sales office field application engineer (fae) technical support 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://microchip.com/support downloaded from: http:///
tc623 ds21441d-page 10 ? 2001-2012 microchip technology inc. 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 whic h 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 docume nt. to: technical publications manager re: reader response total pages sent ________ from: name company address city / state / zip / country telephone: (_______) _________ - _________ application (optional): would you like a reply? y n device: literature number: questions: fax: (______) _________ - _________ ds21441d tc623 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? downloaded from: http:///
? 2001-2012 microchip technology inc. ds21441d-page 11 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 buyers 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, dspic, flashflex, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, pic 32 logo, rfpic, sst, sst logo, superflash and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mtp, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. silicon storage technology is a registered trademark of microchip technology inc. in other countries. analog-for-the-digital age, app lication maestro, bodycom, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mpf, mplab certified logo, mplib, mplink, mtouch, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, real ice, rflab, select mode, sqi, serial quad i/o, total endurance, tsharc, uniwindriver, wiperlock, zena and z-scale 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. gestic and ulpp are registered trademarks of microchip technology germany ii gmbh & co. & kg, a subsidiary of microchip technology inc., in other countries. all other trademarks mentioned herein are property of their respective companies. ? 2001-2012, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. isbn: 9781620768259 note the following details of the code protection feature on microchip devices: microchip products meet the specification cont ained 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 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 specif ications contained in microchips 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 semiconduc tor 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 co mmitted to continuously improvin g the code protection features of our products. attempts to break microchips 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. microchip received iso/ts-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory an d analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified. quality management s ystem certified by dnv == iso/ts 16949 == downloaded from: http:///
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